Van Life DIY Electrical Systems – Complete Guide 2025
Building your own electrical system in a UK van is one of the most rewarding DIY projects you can undertake. For £500-£1,500, you can build a system that outperforms many factory-fitted campervan electrical setups, and you'll understand exactly how everything works for troubleshooting on the road.
System Components
Battery: 100-200Ah lithium (LiFePO4). We recommend the Battle Born 100Ah (£350-£500) for quality, or the Budget 100Ah (£150-£250) for cost savings. Lithium batteries offer 2,000-5,000 cycles vs 500-1,000 for AGM.
Installation Steps
- Plan your layout — where will batteries, charge controller, and inverter sit? 2. Run wiring from battery to fuse box. 3. Connect charge controller to solar panels. 4. Connect inverter to battery. 5. Test everything. Total install time: 4-8 hours.
DIY Electrical Systems for Van Life
A typical UK van life electrical system includes: a lithium battery (100-200Ah), a charge controller (MPPT), an inverter (if you need 240V AC), and fuses/breakers for safety. The total cost for a basic 100Ah system is around £500-£800, compared to £2,000-£5,000 for factory-fitted systems.
System Components
Battery (100-200Ah lithium): We recommend the Battle Born 100Ah (£350-£500) for quality, or the Budget 100Ah (£150-£250) for cost savings. Lithium batteries offer 2,000-5,000 cycles vs 500-1,000 for AGM. For UK van lifers, a 100Ah battery is sufficient for most needs including lights, charging, and small appliances.
Charge Controller: The Victron SmartSolar MPPT (£80-£120) is the gold standard for UK van life. It maximises solar output and has Bluetooth monitoring. Budget option: Renogy Rover (£60-£90).
Inverter (optional): If you need 240V AC for UK appliances, a 300-500W pure sine inverter costs £50-£100. Only needed if you plan to run a kettle, toaster, or laptop charger from the van.
Fuse Box: A 12V fuse block with a 30A main fuse and individual circuit fuses is essential for safety. Cost: £15-£30.
Installation Steps
-
Plan your layout: Where will batteries, charge controller, and inverter sit? Choose a ventilated, accessible location.
-
Run wiring from battery to fuse box: Use 6mm² or 10mm² cable for the main power run.
-
Connect charge controller to solar panels: Route cable from solar array to charge controller location.
-
Connect inverter to battery: If using an inverter, run thick cable (10-16mm²) directly from battery.
-
Test everything: Use a multimeter to verify voltages before connecting loads.
Total install time: 4-8 hours. The most challenging part is routing cables through the van floor — we recommend drilling through the roof or using existing cable entry points.
Power Consumption Guide
Here's a typical UK van life daily power consumption:
- LED lights: 50Wh/day
- Phone/tablet charging: 30Wh/day
- Fridge (12V): 50Wh/day
- Water pump: 20Wh/day
- WiFi router: 15Wh/day
- Inverter (300W) for appliances: 200Wh/day
Total daily consumption: 365Wh. With a 100Ah lithium battery (1,280Wh usable), you can run everything for 3+ days without solar input.
Pros and Cons
Pros: Save £500-£2,000 vs factory installation, customisable to your exact needs, understand exactly how everything works, can expand later by adding more panels or batteries.
Cons: Requires DIY skills, need to buy individual components (may not be bulk-cheaper), warranty coverage may be limited, incorrect installation can cause fire risk.
