Build Your 12V Campervan Electrical System

Start with our free Campervan Electrics Design Tool. In a few clicks it will:

• Guide you through your electrical setup
• Tell you how many days you can stay off-grid
• Provide a price breakdown of everything you need

If you'd like extra reassurance, message us or call us and one of our electrical experts will design you a bespoke system—free of charge.

That's perfectly fine — we are here to help.

The first step is to fill in our online form. We ask four basic questions, we then calculate 1) what power you need to run your appliances, 2) how much stored power and charging you need for your off grid adventures and 3) if you will be off grid or at a campsite or both. All of this and then use our advanced algorithm to recommend to you an electrical system.

After that, you will have the opportunity to book a call with us, allowing us to ensure your electrical system is perfect for your next adventure.

Absolutely! When using our online builder to design your electrical system, you can remove any products you already have from the basket before checkout. We'll ship the remaining components to you and provide a customised wiring diagram and installation guide. This guide will show you exactly how to connect both the products you purchase from us and the ones you already have, ensuring a seamless and hassle-free installation.

Yes, we offer flexible solar panels that are ideal for pop-top roofs and curved surfaces. Get in touch with our team to discuss the best options for your vehicle.

When you purchase from Vunked you get an adventure-ready guarantee — we will make sure your electrics are setup and you are on the road.

Furthermore, our adventure-ready guarantee extends to when you are on the road and travelling; we will continue to support you with any issues you encounter along the way.

We have a 30-day return money back guarantee policy.

Yes! We provide ongoing support to all our customers under our Adventure-Ready Guarantee.

Yes! You'll receive a tracking link once your order is shipped.

We provide a 5-year warranty on all Victron components and batteries. All other components have a 1-year warranty.

Yes, we do. Once you purchase parts from us, we can also organise installation. Just make sure to mention this to us beforehand via email or phone.

The most accurate way to design a campervan electrical system is to calculate your daily energy usage first. Most van life electrical systems consume between 800Wh and 2,500Wh per day, depending on appliances. Our Campervan Electrics Design Tool guides you through vehicle type, charging sources, off-grid duration and budget, then recommends a complete campervan electrics kit matched to your needs. It also estimates how many days you can remain off-grid based on battery capacity and solar input. If you want reassurance, one of our engineers can review and refine your van electrical system design free of charge.

That's very common. In our experience, most first-time builders either underestimate the battery capacity they'll need or overestimate what UK solar can do, especially in winter. The safest starting point is identifying what you'll power daily. Typical appliances include a 12V fridge (30–50Ah per day), LED lighting (5–15Ah per day), laptop charging (10–15Ah per day) and a diesel heater (8–15Ah per day). Our configurator asks four simple questions and then builds a structured campervan electrical system around real usage, not guesswork. You can then speak to an expert to fine-tune your campervan power system before ordering.

Yes. Many builders already own items such as lithium batteries or solar panels. When designing your campervan electrical system kit, you can remove those products before checkout. We then integrate your existing components into the overall van electrical system design. The customised wiring diagram shows correct fuse ratings, recommended cable sizes, charging configuration and integration with new components. Compatibility matters, especially with lithium charging profiles and DC-DC chargers. Ensuring everything works as one coordinated campervan power system improves safety, charging efficiency and long-term reliability.

Electrical uncertainty is one of the biggest barriers in DIY van builds. Incorrect cable sizing or fuse placement is responsible for most campervan electrical issues. With every campervan electrics kit, we provide continued support under our Adventure-Ready Guarantee — where we promise to ensure your electrical system stands the test of time. We will be available to help during installation and on the road if any issues occur. If you encounter problems during installation, we can help you resolve wiring layout questions, inverter configuration or charging setup. A properly designed campervan wiring kit, combined with ongoing guidance, significantly reduces common installation errors.

We offer a 30-day money-back return policy on unused campervan electrical kits. Electrical components must be in resalable condition with original packaging. This allows customers to review their van electrical system plans without a long-term commitment. Industry standard return windows for electrical goods typically range between 14 and 30 days, so this aligns with common UK practice. Full details, including exclusions and process steps, are available in our Returns & Refunds policy to ensure clarity before purchase.

Yes. Electrical systems evolve as van life needs change. Many customers upgrade solar capacity, switch to lithium batteries or add higher-power inverters months later. We continue supporting previous campervan electrical system purchases by reviewing upgrades and compatibility. Long-term support is important because van conversion electrics are rarely static. Adding a new component without checking the charging balance or fuse protection can create issues. Ongoing guidance helps maintain system stability and ensures your campervan power system continues operating safely. We have designed our systems to be modular, so anything can be upgraded with minimal impact to the rest of the system.

Yes. Once your campervan electrics kit is dispatched, you will receive a tracking link with estimated delivery times. Most UK deliveries arrive within 1–3 working days, depending on component type. Larger items such as lithium batteries may ship separately for safety and compliance reasons. Tracking ensures you can coordinate delivery around your build schedule, especially when working to tight van conversion timelines.

Warranty coverage varies by component. We provide a 5-year warranty on Victron components and batteries, and a 1-year warranty on other electrical components. Lithium batteries often carry extended manufacturer warranties because cycle life typically exceeds 2,000–3,000 cycles. Warranty coverage protects against manufacturing defects, not installation errors. Ensuring your campervan electrical system is installed in accordance with fuse ratings and wiring specifications helps maintain full warranty eligibility.

Yes. While many customers install a DIY campervan electrical system themselves, we can arrange professional installation after purchase. Professional installation may be preferable for high-power systems exceeding 2,000W inverter capacity. Installation services are coordinated in advance and depend on location availability. Contact us before purchasing to discuss logistics, timelines and compatibility with your chosen campervan electrical system kit.

The cost of a campervan electrical system UK builders install depends primarily on battery chemistry, inverter size and off-grid requirements. A simple van electrical system for weekend use may cost around £1,000, while a fully off-grid campervan electrics kit with lithium batteries, solar and a 2,000W inverter can exceed £3,000. The biggest cost drivers are what 230V AC appliances you want to power off-grid, as this affects inverter power rating, lithium battery capacity, solar array size, and wire and fuse sizing. Designing the system around realistic daily energy consumption prevents overspending or under-specifying your campervan power system.

Battery sizing is calculated by ensuring you have enough energy stored for your off-grid adventure and that your battery can handle the maximum current draw from your largest 230V AC appliances. This is why nailing down what appliances you want to power off-grid is almost always the first step. Our online tool takes the headache out of these calculations by doing it for you. At the very least, you want to make sure your batteries can last you 1 or 2 days with no charging. If you have high-powered AC appliances like an induction hob, you will need at least 600Ah so they can handle the current draw. A balanced off-grid campervan electrics kit must match the battery size to the charging input from solar or DC-DC charging. Oversized batteries without sufficient charging capacity can take multiple days to recover fully. Vunked builds around Fogstar Drift LiFePO4 batteries — the same lithium chemistry as the premium options, at a price that leaves more of the budget for a properly sized MultiPlus, more solar, or upgraded monitoring. Sodium-ion batteries are starting to appear in stationary storage, but they're less energy-dense than LiFePO4 and aren't yet practical for campervan use, where weight and space are at a premium.

Yes, provided the system is properly designed. The most common DIY errors involve undersized cables, missing fuse protection and incorrect sizing of batteries or solar. A structured campervan wiring kit reduces these risks by specifying exact fuse ratings and cable sizes. According to industry safety guidance, correct fuse placement is critical to prevent short-circuit damage. With a clear wiring diagram and guidance, many van life electrical system installations are completed successfully by first-time builders.