Common Mistakes to make

Common Mistakes: Avoiding Costly Errors in Campervan Electrical Installations

Building a campervan electrical system is an exciting endeavour that requires careful planning and attention to detail. An efficient and reliable electrical system is essential for powering appliances, charging devices, and providing a comfortable living space on the road.

We have put together some common mistakes that you should be avoiding. These are mistakes we see being made time and time again and by mitigating these issues you can not only save yourself time and money but also keep your investment and yourself safe.

Under or over sizing your system

An undersized electrical system occurs when the components, such as batteries, solar panels, and inverters, are insufficient to meet the power demands of your campervan. The most apparent danger of an undersized system is running out of power prematurely, leaving you without essential amenities during your adventures.

Beyond inconveniences, an undersized system can damage your batteries due to excessive discharge cycles. Lead-acid batteries, commonly used in campervans, are sensitive to deep discharges, which can drastically shorten their lifespan and lead to costly replacements.

An oversized system can also cost more upfront, which might not be justifiable for the actual power requirements of your campervan. Over investment in unnecessary components can divert resources from other essential aspects of your tiny build, such as gas systems, water systems or cabinetry.

Poor Planning Of Your Installation

The most crucial stage of your entire electrical build is the planning and preparation.

Before diving into the installation process, you need to assess your power requirements. By contacting us at Tiny Build Electrics we will assess your power requirements and supply you with a wiring diagram (schematic) tailored to your individual needs.

Installing a system that has not been designed correctly could not only be dangerous, but is certainly not cost effective. You could potentially find yourself with a undersized or oversized system.

A consultation with a qualified and competent person with years of experience designing and installing electrical systems in camper vans can set you on the right track.

Tom Tiny Build

Contact us for a one to one consultation and start planning your electrical system

Not Adjusting Parameters & Settings Within Devices

An all too common mistake we see made is the incorrect setup of electrical equipment once installed in a campervan. Installing the equipment is only half of the job, the other half involves programming and setting the correct parameters for the equipment. Remember, when the equipment leaves the factory its set to work in multiple ways over many different types of installations. We need to tell the equipment exactly what it needs to be doing specific to our installation.

Victron Energy electrical equipment, such as battery chargers, inverters, and solar charge controllers, rely on accurate charge parameters to regulate the charging and discharging of batteries. These parameters determine the voltage levels, charging algorithms, and charging currents used to maintain the batteries health and maximise their lifespan.
By programming the correct charge parameters, campervan owners can ensure that the electrical system operates within safe and efficient limits. This includes preventing overcharging, undercharging, or mismatched charging currents, which can lead to various problems, such as reduced battery capacity, premature battery failure, and decreased overall system performance.

Charge Voltage

Detrimental Effects of Incorrect Charge Parameters

Battery Degradation
Correct charge parameter programming plays a vital role in maximising the efficiency and lifespan of all batteries. By precisely controlling the charging process, batteries can operate within their optimal ranges, minimising stress and wear. Properly programmed charge parameters prevent overcharging, undercharging, or charging at improper temperatures, all of which can degrade battery performance over time. Optimised charging leads to prolonged battery life, increased system efficiency, and enhanced overall reliability.

Reduced Battery Life
Charging batteries with incorrect parameters can significantly reduce their lifespan. Batteries that are consistently overcharged or undercharged experience increased stress, resulting in a shorter service life. This can lead to frequent battery replacements, incurring additional expenses and inconvenience for campervan owners.

Inefficient Power Management
Programming incorrect charge parameters may lead to inefficient power management within the campervan’s electrical system. Improper charging algorithms and current limits can result in reduced energy conversion efficiency, leading to higher energy consumption and decreased overall system performance. This can impact the availability of power for running appliances and devices, disrupting your experience in your campervan.

Require assistance with your programming your electrical equipment? We can help you through this complicated phase.

Contact us for a consultation and we’ll be happy to help

Victron Electrics

Not Implementing A Battery Management System

Using the correct battery management system (BMS) in a campervan is crucial for several reasons. A BMS is responsible for monitoring and controlling the charging, discharging, and overall management of the batteries in the campervan’s electrical system.

Battery Health and Longevity
A BMS ensures that the batteries are charged and discharged within safe limits, preventing overcharging and over-discharging. Overcharging can lead to excessive heat generation and damage the battery cells, while over-discharging can cause irreversible capacity loss. By maintaining optimal charging levels, a BMS helps extend the battery’s lifespan and overall health.

Batteries, especially lithium-ion batteries commonly used in campervans, can be hazardous if not properly managed. A BMS monitors the battery’s temperature, voltage, and current, preventing dangerous situations such as thermal runaway, overcurrent, and short circuits. It ensures that the battery operates within safe parameters, minimising the risk of fire, explosions, or other safety hazards.

Performance Optimisation
A BMS optimises the charging process to maximise the battery’s performance. It ensures that the batteries receive the appropriate charging current and voltage, preventing undercharging and optimising the charging efficiency. Proper charging and maintenance significantly enhance the battery’s capacity and overall performance.


Not Using Compliant Accessories, Cables and Fuses!

Cables form the backbone of electrical systems, carrying power and ensuring efficient distribution throughout your campervan. Using the right type of cable, with appropriate size and insulation, is paramount in maintaining electrical safety.

IET British Standard 7671 provides guidelines for cable selection based on factors such as current-carrying capacity, voltage drop, and environmental conditions.

Non-compliant or substandard cables may overheat, fail to handle the intended load, or be prone to insulation failure, putting lives and your campervan at risk.

Fuses play a vital role in safeguarding electrical circuits by preventing excessive current flow. They act as protective devices that interrupt the current in the event of a fault or overload. By using the correct types of fuses specified by BS7671, the risk of electrical fires and equipment damage can be minimised significantly.

Selecting fuses that are non-compliant or incorrectly rated can compromise the entire electrical system, leading to potential hazards.


Risks Associated with Non-compliant Products

Failure to adhere to BS7671 regulations by choosing non-compliant fuses and cables can have severe consequences. Some of the risks involved include:

Fire Hazards: Non-compliant fuses and cables may fail to interrupt the circuit during an overload or short-circuit, leading to excessive heat generation and potentially causing fires.

Electrical Faults: Incorrectly sized or poorly insulated cables can result in electrical faults, including short circuits and electric shocks, endangering the safety of individuals and damaging electrical equipment.

Equipment Damage: Non-compliant fuses and cables can put significant strain on electrical devices and appliances, leading to their premature failure or malfunction.

Legal Consequences: Failure to comply with BS7671 regulations has the potential to result in legal liabilities, including fines, penalties, and possible litigation in the event of accidents or injuries.

Example Photo Below: Contact plates taken from a failed, non-compliant Isolator.

This isolator prematurely failed due to being cheap and non-compliant. Although the manufacturer stated this isolator could withstand 200a (amps) for 15 minutes, it clearly could not and disintegrated causing a premature system failure. This failure occurred with a load of only 62a, maximum load ever put through the isolator was 166a for very short periods, not even close to the stated 200a.

This is an example of using cheap accessories. Luckily the fault was found and rectified before it got serious. This could have easily caused a fire.

Common Mistakes

Not Using Expert Guidance

Attempting to navigate the intricacies of a campervan’s electrical system without expert help may appear to save money initially, but it can lead to long-term inefficiencies and headaches. Using professional guidance not only ensures a safer and more reliable electrical setup but also grants campervan builders peace of mind.

Not using expert guidance can lead to a haphazard integration of various components, creating a convoluted mess of cables and circuits. This tangled web not only confuses owners but also makes it incredibly challenging to troubleshoot and diagnose problems, wasting precious time that could be spent enjoying the journey.


Safety concerns are another significant issue that arises from not seeking professional advice. Campervan electrical systems deal with potentially hazardous components like batteries and inverters. Incorrect installations can lead to short circuits, fires, or electrical shocks, jeopardising both campervan owners and their beloved tiny homes.

Tiny Build Electrics ensures that every aspect of your campervan’s electrical system is meticulously designed to suit your unique needs. From efficient power distribution to reliable charging solutions and smart energy management, we’ve got you covered.

Get in touch and let us guide you through your electrical installation!

Not Adhering To Regulations & Guidance Notes

The primary reason to implement regulations and guidance notes when building a campervan electrical system is to prioritise the safety of its occupants.

A campervan is essentially a small mobile dwelling, and just like a traditional home, the electrical system must be designed and installed with utmost care. By following established standards, such as the IET BS7671, campervan builders can mitigate potential electrical hazards, reducing the risk of fire, electric shocks, and other accidents.

Converting a van into a campervan is a considerable investment of time, effort, and money. By following electrical regulations during the wiring process, you safeguard your investment from costly damages caused by electrical issues or non-compliance. Furthermore, a well-designed and correctly wired electrical system can increase the resale value of your campervan should you decide to upgrade or sell it in the future.


Not Prioritising Safety

Safety should be a top priority when building your campervan electrical system. Install the correct RCD’s and MCB’s to help keep your 230V system safe. Use insulated connectors and secure all connections to avoid accidental short circuits. It’s advisable to have a qualified professional inspect your electrical work to ensure compliance with safety

Circuit Protection
Incorporate circuit protection devices like fuses and circuit breakers throughout the electrical system. These safety measures help prevent overloads and short circuits, safeguarding the system and its occupants from potential electrical hazards. Install fuses with the correct amperage for each circuit, ensuring they offer optimal protection without compromising performance.

Isolation and Disconnects
Include isolation and disconnect switches to control the flow of electricity in the campervan’s electrical system. These switches allow you to disconnect specific circuits when they are not in use or during maintenance, reducing the risk of accidental electrical issues. Additionally, an emergency cutoff switch can be installed to disconnect the entire electrical system in case of an emergency.

Grounding and Bonding
Grounding and bonding are essential safety measures to protect against electrical shocks and fires. Ensure all metal components, such as the chassis, are appropriately grounded. Bonding, on the other hand, connects all metallic surfaces in the campervan together, reducing the risk of electrical potential differences. This prevents accidental shocks and reduces the chance of electrical damage to sensitive equipment.


Neglecting Maintenance

Regularly inspect and maintain your campervan’s electrical system. Clean solar panels, check battery connections, and monitor charge levels. Keep an eye out for any signs of wear or damage and address them promptly. Proper maintenance ensures the longevity and reliability of your electrical system.

To ensure your campervan’s electrical system is in top condition, follow these maintenance tips:
Regular Inspections: Schedule periodic inspections of your campervan’s electrical system. Look for signs of wear, loose connections, or any visible damage to wires and components.

Battery Care: Check the battery’s water levels (if applicable) and keep the terminals clean and corrosion-free. Consider investing in a battery monitor to keep track of its health and charge status.

Inverter Maintenance: Test the inverter regularly to ensure it’s functioning correctly and providing the required power output.

Wiring Checks: Inspect all wiring for signs of wear, chafing, or damage. Replace any damaged wires promptly and secure all connections tightly.

Solar Panel Examination: If your campervan has solar panels, clean them regularly and ensure they are free from dirt and debris that might hinder their performance. Check all MC4 connectors on the roof as well as the cable entry point to ensure the cables are being managed correctly upon their entry into the vehicle.

Fuse and Circuit Breaker Testing: Regularly test and replace faulty fuses or circuit breakers as needed to maintain a reliable electrical system. Check out our basic testing guide here!

Seek Professional Assistance: For complex electrical issues or if you’re unsure about handling certain tasks, consult a qualified professional, such as Tiny Build Electrics, who specialise in campervan electrical systems.



Building a campervan electrical system requires careful planning and adherence to best practices. By ensuring you don’t make the common mistakes outlined above, you can create a safe, efficient, and reliable electrical system for your campervan adventures.

Remember to prioritise power needs, avoid overloading, invest in quality components, and prioritise safety. With a well-designed electrical system, you can enjoy the comforts of modern living while exploring the great outdoors.

If you require any further help with the design, installation or commissioning of your electrical system please contact us and we will be happy to help.

Tom Alderdice

Hey, I’m Tom – founder of Tiny Build Electrics

My mission is to help sustainable-minded folks develop their electrical knowledge, giving them the confidence to do their own tiny build electrics.

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How to Kickstart Your Campervan’s Tiny Build Electrics System

The hardest part of your build is likely to be your electrical system. So let’s break it down into several stages.

Your campervan electrical system is going to play a big part in the comfort of your van. Lighting, cold beers and movie nights all depend on a reliable, safe system that you can call upon anytime, anywhere.

A well functioning setup, designed to meet your needs is fundamental to turning a lump of metal on four tyres into your home on wheels.

Electrical systems in camper vans and motorhomes tend to go unnoticed, that’s until… they no longer work or there are issues. Get this stage of your build right and its going to save you headaches further down the line.

Whether you’re preparing to install a complete DIY camper van electrical system from scratch, upgrading an existing setup or want to figure out if the electrics in a pre-loved camper suit your needs, this section is for you.

Electrical Components

Once you’ve received your Tiny Build Electrics wiring diagram (schematic), the next stage is to start deciding what components you’re going to fit in order to create your system.

A leisure battery is of course essential to power your lighting and appliances and depending on how you want to charge it, you may need a battery charger and/or a solar panel and solar charge controller.

You may want to consider an inverter if you plan on running household appliances such as, blenders, hair straighteners or other such equipment that require 230V AC. Fuse boxes, switches and miniature circuit breakers will help to keep your system safe. Battery monitors, solar monitors and system monitors will help you keep an eye on the state of your system.

That’s just the bare essentials you’re going to need in order to create a electrical system in your camper van. But, all of these components have many variations, styles, sizes and different manufacturers.

Everything you will need to wire your camper van you will find in our shop!



Sizing your system

Before you dive down the rabbit hole of buying electrical components you need to size your system.

Over sizing your system will cost you a lot of money and ultimately you won’t see the benefit. Under sizing your system will potentially damage expensive equipment and create a system that’s unusable.



In order to size your batteries you need to calculate the load. By ‘calculate the load’ we mean to look at all the components and appliances that you will be powering using the batteries. The more components and appliances, the higher the load, and the higher the load, the bigger the battery bank.

You need to think about appliances such as fridges, fans, pumps, hot water appliances, chargers and lighting. These are the most common appliances used in a camper van’s electrical system. The power these appliances use depend on the manufacturer and model, so be sure to pick an appliance you are happy with before you find its power usage. Do not generalise when it comes to calculating your appliances power usage, the more accurate you can be, the better!
In order to size your system you will need to understand the equation below, this will help you find your total load.

Maximum power of your appliance (watts) divided by the voltage of your system = Current (amps)

Current (amps) multiplied by how many hours of usage per day = Amp Hours per Day (Ah/day)

Example: Fan: 80watts / 12 = 6.66amps – 6.66amps X 2 hours = 13.3ah/day

Appliance Power (watts) Usage (hours per day) Amp Hours Per Day (Ah/Day)
Fan 80 2 13.3
Fridge 70 6 35
Lighting 22 2 3.6
Water Pump 80 1 6.66
USB Sockets 5 3 1.25
WI-FI Hub 5 24 10
Diesel Heater 60 5 25
Tank Level Sensors 2 24 4
Smoothie Maker 250 0.05 1.04
Hair Straighteners 250 0.1 2.08
Laptop Charger 80 6 40
Inverter (no load) 15 6 7.5

Always calculate the worst case scenario. This allows for oversights and items you may add towards the end of your build.

When calculating how long each of your lights are on for, use one hour in the morning for the entire lighting system and one hour in the evening for the entire lighting system. This averages out the lighting usage nicely.

Remember when thinking about how long appliances will be on for, items like fridges intermittently cut in and out. Take this into consideration. We have allowed 6 hours per day for the fridge, but this depends on the fridges size, settings and ambient temperature of your campervan.
From the table above we can now see that our total daily usage will be around 149.43ah/day. Remember this is worst case scenario, in the summer your heater won’t be running as often and in the winter your fridge won’t be on for as long.

Once the load has been calculated you now know roughly know what size battery you require.

We say ‘roughly know’ because how you recharge your batteries also comes into play when choosing the size of your batteries. A larger charging source that will keep up with demand means your battery bank doesn’t need to be as large, limited charging sources means you need to allow for the full amount of ‘ah’ between each charge period.

Type of Battery

Your battery type depends upon a few things.

1. Budget – how much you are willing to spend on your batteries.
2. Travel style – Do you plan to be fully off-grid, partially off-grid, use campsites or maybe a mixture of them all?

If you have access to shore power charging on a regular basis, campsites for example, then how long your battery bank needs to operate off the grid is not too much of an issue. But, if you plan to be fully off-grid your batteries need to be able to sustain your load as well as be charged and discharged on a regular basis by your engine and/or solar array.

Read more about battery types on our dedicated Battery Types Guide!

Battery types

Price Comparison

The table above clearly shows us that whilst the lithium-ion battery is more expensive than an AGM battery, it certainly is cheaper when you consider the cost per cycle over its lifetime. The life cycle of the lithium-ion battery is certainly unmatched and is something to consider if you want a ‘fit and forget’ electrical system in your camper van.

Battery Type Average Life Cycles @ 50% DOD Price (£) (TBE SHOP) Cost per Cycle (£)
Victron Energy 110ah AGM Battery 850 316.99 0.37
Victron Energy 100ah LiFePo Battery 5000 £1,275.60 0.26
Life Cycle

Flood lead acid (FLA)

Flood lead acid batteries consist of two lead plates, one positively charged, the other negative. The battery is then flooded with a liquid electrolyte, sulphuric acid which covers all internal parts. When charging commences the acid and lead plates react to store electricity.


  • Low cost
  • Resilient to occasional over charging
  • Proven technology
  • Lifespan can be 4-8 years with regular maintenance and careful charging
  • Less susceptible to temperature differences


  • As the batteries age the performance will degrade to the point where the battery won’t hold a charge
  • Should be stored inside an enclosure (battery box)
  • Battery can only be drained to a maximum DOD of 50%, otherwise you’re likely to incur damage.
  • Must be vented in an enclosed area as some FLA batteries will emit gases.
  • Stricter regulations on how FLA batteries are fitted and how close they are installed to inverters and chargers.
  • Require regular maintenance
  • Heavy


Gel batteries use the same technology as FLA but instead of liquid acid they are filled with Gel. Gel gives us more advantages than FLA as you will see below.


  • Doesn’t emit any nasty gases
  • Sealed so can’t leak or produce any gas
  • Maintenance free
  • Operates in a wider array of temperatures than AGMS.
  • Ideal for vans that are stored over winter and not used for long periods of time


  • Very sensitive to depth of discharge
  • Do not recover well from a low DOD
  • More expensive than conventional FLA and AGM
  • Heavy

Absorbed glass mat (AGM)

AGM batteries work in a similar manner to FLA and Gel. Instead of acid or gel they have electrolyte soaked glass fibres between the positive and negative plates.


  • Long shelf life
  • Maintenance free
  • Ideal for vans that are stored over winter and not used for long periods of time
  • Can be installed sideways as its a sealed unit and cannot leak (unless damaged)
  • Smaller than the conventional Gel equivalent


  • Very sensitive to depth of discharge
  • Do not recover well from a low DOD
  • More expensive than FLA
  • Heavy
  • Poor performance in colder temperatures

Lithium LiFePO4 / Lithium-ion / Li-ion

The famous lithium-ion battery. If you have done any sort of research on tiny building or off grid systems then I am sure you would have come across the lithium battery. Currently at the top end of the battery technology market this is a battery you should be seriously considering for your build, there’s just one downside… £££!


  • 30% lighter and smaller than FLA, GEL & AGM
  • You can use up to 90% of their capacity meaning you need less batteries for the same output
  • Low internal impedance (resistance) mean these batteries also charge a lot quicker than the other types of batteries.
  • Can be installed in various orientations
  • Long life cycles if charged and discharged in accordance with manufactures instructions
  • Maintenance Free


  • Very sensitive to charging in low temperatures
  • Expensive, although prices have started to drop over the past few years
  • A battery management system is required to protect the lithium-ion battery bank from excessive discharging, over charging and to control the load and balancing of each internal cell. Most of the time this system is built into the battery itself.
  • Some extra monitoring may be required such as battery temperature monitoring

If you want the cheapest then Flood Lead Acid is for you. These batteries are as cheap(er) and can be picked up in various frame sizes as well as amp hour sizes. But please note, these batteries need ventilation and you need to monitor them to ensure they are not leaking, therefore they cannot be buried deep in your tiny build, bear this in mind!

If you want a fit and forget system with efficiency and a long cycle life then Lithium-ion is for you. Yes, the lithiums are expensive, but, they are slowly coming down in price due to their popularity. When you consider the price of the lithium you must consider its lifecycle and depth of discharge (DOD). Considering a absorbed glass mat (AGM)battery will enter in at around 500 cycles, lithiums are 5000+ cycles. Not only will they last longer (if installed and charged correctly) they are a LOT lighter which is important when it comes to conversions such as vans, motorhomes, buses and lorries which have weight limits.

Battery Charging


Using solar panels is a really efficient and economical way of charging your batteries. There are, of course, many different types and sizes of panels you can use. We recommend fitting as many solar panels as you possibly can in the space you have available, but you must take into consideration such items as vents, sports equipment and satellite dishes that may cast a shadow onto your solar panels. This could have a detrimental effect on your solar panels charging capabilities.


Alternator Charging

Using the alternator of your vehicle is another great way of charging your batteries. If the engine is running and the alternator is spinning then you may as well harness some of this power to help charge your battery bank. There are a few ways you can do this.

1. Voltage Sensing Relay: When your engine starts, the alternator produces a charging voltage which is sent to your engine battery. A voltage sensing relay will sense the charge voltage (above 13.7V) and close. Once closed, it will send the charge current towards your leisure batteries to charge them. As soon as you turn your engine off, the voltage of your engine battery will drop below 13.7V and the relay will open, disengaging the engine battery from the leisure batteries. This is key because you do not want to wake up to a discharged engine battery the following morning. This method should not be used with batteries that require several stages off charge. Most modern leisure batteries now require a three stage charge in order to maintain optimum life cycles, therefore we do not recommend this way of charging.


2. Battery to battery charger (DC-DC Charger): A battery to battery charger, like a voltage sensing relay, sits between the engine battery and the leisure batteries. The battery to battery charger converts the voltage its receiving from the engine battery into a voltage better suited to the charge parameters of your leisure battery. The charger also offers three stage charging, which, for most leisure batteries, is the preferred way of charging. The three stages of charge are Bulk, Absorption and Float. These three charge parameters are not only critical to maintaining a healthy battery system within your conversion but must be adhered to in order to comply with manufacture’s warranties. If these aren’t followed this can have a detrimental effect on your warranty and life cycles of the batteries. This clever device is a must if you plan to live and travel off the grid. We highly recommend fitting a battery to battery charger within your installation.

Battery to Battery chargers are also required on modern engines which have a ‘smart alternator’. A smart alternator decouples itself once the engine battery is satisfied with the voltage of the engine battery. This takes the load of the alternator off of the engine and therefore makes it more fuel efficient. Regardless of the drop in voltage from the engine battery, a battery to battery charger will continue to charge, depleting the engine battery of its power. Once the engine battery is low, it will call for power, re-coupling the alternator to the engine for some charge voltage. This is where a B to B charger is superior over a VS relay. The VS relay would open as soon as the alternator decoupled itself, because it would think the engine has been switched off. At this stage a VSR would open and stop charging and you would be driving along without a charge current for your batteries.



Campervans are an excellent way to travel, allowing you to explore new places while enjoying the comfort and convenience of a home on wheels. To make the most out of your campervan, it’s important to have the right equipment, and one essential piece of equipment is an inverter.

An inverter is becoming ever more popular in campervans and tiny home builds. Inverters are used to convert DC voltage into AC voltage. They are a very complex piece of equipment and can be very expensive so a phase in which you want to get correct.

Find out more about inverters here!

When choosing an inverter you need to refer back to the table earlier in the article. Again, you need to look at the loads in which you will be using your inverter to power.

Appliance Power (watts) Usage (hours per day) Amp Hours Per Day (Ah/Day)
Smoothie Maker 250 0.05 1.04
Hair Straighteners 250 0.1 2.08
Laptop Charger 80 6 40
Inverter (no load) 15 6 7.5

Looking at the chart above, all the 12V only items have been removed and we are specifically looking at the items which require a single phase, alternating current with a voltage of 230V. The combined wattage of all these items is 595W.

So here a 1000w inverter would be sufficient to power these 230V items. A smaller, 600w inverter could be used here, but we would advise going slighter bigger than you need to allow for future additions.

Pure sine wave & modified sine wave inverters

At Tiny Build Electrics we advise ensuring that the inverter you purchase is pure sine wave and NOT modified sine wave. Put simply, the pure sine wave gives a smoother alternating sine wave which is more friendly towards your electronic items, especially those that have single phase AC motors like smoothie makers and blenders. Modified sine wave gives different wave, its more jagged and square. This is fine for items like lamps and hair straighteners because they are not reliant upon a true alternating sign wave. But, for the longevity of your system, pure sine wave will run all types of electronic equipment you decide to bring into your campervan.


Solar Panels

Installing solar panels on a campervan can be a great way to power your adventures and reduce your reliance on traditional sources of energy. Here are some things to consider when planning your installation:

1. Power requirements: Determine how much power you need for your campervan by calculating your average daily power usage. This will help you determine how many solar panels you need to install.

2. Available space: Consider the available roof space on your campervan, as this will determine the size and number of solar panels you can install. You may also want to consider the orientation of the panels and the amount of sunlight they will receive.

3. Type of solar panel: There are two main types of solar panels: monocrystalline and polycrystalline. Monocrystalline panels are more efficient, but also more expensive. Polycrystalline panels are cheaper but less efficient.

4. Charge controller: A charge controller is necessary to regulate the charging of your battery and prevent overcharging. Make sure to choose a controller that is compatible with your solar panel and battery system.

5. Wiring and installation: Proper wiring and installation are critical to the performance and safety of your solar panel system. Consider hiring a professional to install the system, or ensure that you have the knowledge and experience necessary to do it yourself.

6. Cost: Finally, consider the cost of the solar panel system, including the panels, battery, charge controller, and installation. While a solar panel system can be expensive upfront, it can save you money in the long run by reducing your reliance on campsites.



Lighting is an important aspect to your build and something you need to plan carefully. It’s not quite as simple as fitting some lights up on the ceiling and having done with it.

You need to consider areas you will need to light the most, kitchen counter tops, shower rooms and toilet rooms and also consider the ambience you want to set in your campervan at night time.

After all, you don’t sit in your house in the evenings with all the main lights on full whilst trying to unwind and relax. Some comfort lighting is key, fairy lights, pelmet lights, low level cabinetry lights. These small additions make a huge difference to overall comfort of your campervan.

A well balanced lighting system in any installation, whether it be a campervan, motorhome, boat or log cabin, can turn a house into home.


Outside Lighting

An aspect of the lighting that most van dwellers forgo is outside lighting. When sat outside your campervan in the evenings you will want to light the outdoors area. Outside lighting is great if you plan to take pets with you in your camper van, easy to keep an eye on them when let out at night.

If you have a tall step up into your campervan it may be worth considering lighting the step area to avoid tripping when entering your vehicle at night.



Appliances and their locations are key to any ergonomic build. Fridges, fans, heaters, water pumps and water heaters are key to a tiny build, especially if you plan to live in it full time.

Not only is there a lot of research involved in what type of appliance you require, its also worth dedicating plenty of planning time into the locations of each appliance. This can make a huge difference to your build. Basic things like ensuring your fridge is in or near your kitchen, your fan is located in an area to remove any cooking smells, steam or smoke.

All of this planning will contribute to your electrical system and help at the installation stage. Knowing where your cable runs are as well as your switch switch and socket locations. Envisaging these locations and runs whilst standing in an empty van is a great way of preparing for your install.

Each appliance will require isolation via a switch. Whether that be local (next to or near to the appliance) or remote (in a cupboard or electrical panel).


System Monitoring

A battery monitor measures battery voltage and current flow into & out of a battery bank and uses these measurements to accurately track the amount of charge left in the battery bank.

Battery monitoring is key to the longevity of your system. Monitoring your batteries performance will give you the most from your investment, ensuring DOD (depth of discharge) and SOC (state of charge) stay within the manufacturers specified parameters. Discharging your batteries too far or not charging them in a required format will damage your batteries and will reduce their life cycles.

Shunt based battery monitoring systems, like the Victron Energy BMV-712 are more reliable than simple voltmeters that are traditionally used as a gauge for tracking the state of charge (SOC) of a battery bank.

Most popular battery monitors now come equipped with bluetooth and the option to see the results from the comfort of your mobile phone. This is a great way of keeping track on your system status.

Victron Energy MPPT controllers will monitor the performance of the solar array giving you information on the overall daily yield, maximum voltages from both the panels and batteries and any errors that may have occurred.

We heavily advise fitting monitors for your batteries as well as the charging sources. If you do this it gives you a good idea of the health of your system. You have more than likely spent a lot of money on batteries, appliances and inverters the monitoring systems are a must to protect your investment.




A fuse breaks the circuit during excess current flowing through it. Fuses protect appliances, batteries, cables and most importantly your whole tiny build. Without fuses faults are able to go unnoticed, arc against the chassis of the vehicle and worse, create a fire.

Miniture Circuit Breakers

A miniature circuit breaker, or MCB, is an isolating component installed within a distribution board or consumer unit, which is designed to automatically trip the circuit if a fault is detected. This means that the power supply is cut off to prevent damage to the circuit, which is typically triggered by an overload or short.

Residual Current Devices

A residual current device (RCD) is a safety device that disconnects the supply automatically if there is a fault. RCDs are far more sensitive than normal fuses and circuit-breakers and provide additional protection against electric shock.

An RCD monitors the electrical current flowing through one or more circuits that its protecting. If the RCD detects current flowing down a path it shouldn’t, it detects an imbalance and the RCD will disconnect the supply extremely quickly, significantly reducing the risk of death or injury.



Basic testing

Carrying out some basic tests on your camper van electrical system is a great way of ensuring your system is correctly connected but also safe.

Many forgo this stage and it can cause some major issues further down the line.

Spending some time to run your eyes over the installation to ensure everything is connected correctly, referencing your Tiny Build Electrics schematic diagram, is key to the longevity of the system.

For the testing of your 230v systems, we advise contacting a qualified electrician to test and inspect this part of the installation. The tests conducted require more complex equipment and a portion of the testing is carried out live and therefore needs to be conducted by competent person(s).


Labelling is a crucial aspect of any installation. By labelling items you are future proofing your system. If a fault was to occur you can easily isolate and location the circuit in question. Also, in an emergency if an appliances needs shutting down being able to quickly identify isolators and fuses is critical.

If you plan to rent your van for other people to use, labelling is a must and will ensure people who are unfamiliar with your build know exactly where everything is located.

Basic testing guide here!


Here at Tiny Build Electrics we take regulations seriously and you should too. Wiring a camper van and creating an off-grid system isn’t just about installing solar panels and batteries. The most important aspect of your build is safety and we pride ourselves on the safety of our systems.

If you are building your tiny home on wheels in the UK you need to be conforming to the British standard 7671 regulations, also known as, BS7671. These wiring regulations are a national standard for electrical installations. Being compliant throughout your build will result in a safe installation for you and your family. These regulations cover all things electrical in your tiny build from your 12V system to your 230V system in your campervan.

There are also a set of regulations specific to motor caravans called the British Standard 1648. These regulations specify safety, health and functional requirements for 12 V direct current (DC) extra low voltage (ELV) electrical installations for habitation aspects of motor caravans and caravans.

If you require help with compliance and understanding these regulations then be sure to book in with Tiny Build Electrics for a one to one consultation. With a consultation we can help you with your design, installation, commissioning of your system and, most importantly, compliance to the regulations. We will also supply you with a detailed schematic diagrams of your electrical system, making your installation process easier than ever.

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Tom Alderdice

Hey, I’m Tom – founder of Tiny Build Electrics

My mission is to help sustainable-minded folks develop their electrical knowledge, giving them the confidence to do their own tiny build electrics.

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