Campervan Inverter Installation
This guide explains how to install a campervan inverter safely from a leisure battery. Learn correct fuse placement, cable sizing basics and typical UK inverter installation layouts.
Campervan inverter installation at a glance
| Component | Purpose |
|---|---|
| Leisure battery | Supplies 12V DC power |
| Main fuse | Protects inverter cable |
| Battery cable | Transfers power to inverter |
| Inverter | Converts 12V DC to 230V AC |
| AC socket output | Powers household devices |
Simple campervan inverter wiring diagram
Leisure battery → fuse → inverter → 230V output
Where to connect an inverter in a campervan
A campervan inverter should always connect directly to the leisure battery, not through the fuse box.
- Provides stable voltage supply
- Prevents overheating distribution wiring
- Ensures correct fuse protection
- Improves inverter performance
What cable size do you need for a campervan inverter?
Cable size depends mainly on inverter power rating and cable length.
| Inverter Size | Typical Cable Size |
|---|---|
| 300W inverter | 6mm² |
| 600W inverter | 16mm² |
| 1000W inverter | 25mm² |
| 2000W inverter | 35mm²+ |
See detailed sizing guide: Campervan Cable Size Guide
Rear campervan inverter installation example
Many campervan conversions install the inverter close to the leisure battery under a seat or inside the rear storage area.
Rear leisure battery → short cable run → inverter → AC output socket
Where to place the fuse when installing a campervan inverter
Fuse placement protects the inverter cable and battery from short circuits.
| Fuse Location | Purpose |
|---|---|
| Near leisure battery | Protects inverter cable |
| Between battery and inverter | Ensures safe current control |
Why inverter cable length matters
Inverters draw high current on the 12V side, so keeping the battery cable run short is one of the most important parts of a good installation.
- Shorter cable reduces voltage drop
- Shorter cable reduces heat build-up
- Heavy cable improves inverter performance
- Long runs often require much larger cable sizes
Common campervan inverter installation mistakes
- Using cable that is too small
- Installing inverter too far from battery
- Missing fuse protection
- Poor ventilation around inverter
- Mounting inverter near heat sources
- Trying to power the inverter through a fuse box
Helpful calculators for inverter installation
Related campervan wiring guides
Plan your inverter installation safely
Correct cable sizing and fuse protection ensure reliable inverter performance in campervan electrical systems.
Open Electrical CalculatorsElectrical installation safety notice
This guide and the associated calculators are provided for general educational purposes only. They show typical wiring layouts and estimation methods commonly used in UK 12V campervan electrical systems.
Every campervan installation is different. Cable sizing, fuse selection, inverter rating, battery chemistry and ventilation requirements should always be checked against manufacturer specifications and the requirements of your specific vehicle.
Where high-current battery systems, DC-DC chargers, inverters or 230V mains hook-up equipment are involved, installation should be completed or inspected by a suitably qualified installer.