12V Fridge Wiring Campervan
This guide explains how to wire a 12V campervan fridge safely from a leisure battery. Learn correct fuse placement, cable sizing basics and typical compressor fridge installation layouts used in UK campervan conversions.
12V campervan fridge wiring at a glance
| Component | Purpose |
|---|---|
| Leisure battery | Supplies 12V power to the fridge |
| Main fuse / branch fuse | Protects fridge circuit wiring |
| Fridge cable | Transfers power from battery or fuse box |
| 12V compressor fridge | Cools food and drinks efficiently |
Simple 12V fridge wiring diagram campervan
Leisure battery → fuse → 12V fridge
How a campervan 12V fridge gets power
A 12V compressor fridge runs directly from the campervan leisure battery system. It usually connects through a fused 12V circuit so the fridge gets stable battery power while parked or travelling.
- Leisure battery supplies the fridge circuit
- Fuse protects the cable
- Correct cable size helps prevent voltage drop
- Stable voltage improves fridge efficiency and compressor startup
What cable size do you need for a 12V campervan fridge?
Most campervan compressor fridges use relatively low running current, but voltage drop still matters because cable runs can be longer than expected.
| Fridge Type | Typical Cable Size | Notes |
|---|---|---|
| Small 12V compressor fridge | 1.5mm² | Shorter cable runs |
| Medium 12V compressor fridge | 2.5mm² | Common campervan choice |
| Long cable run install | 2.5mm² to 4mm² | Helps reduce voltage drop |
In many campervans, 2.5mm² cable is a safe and practical choice for fridge circuits.
What fuse size do you need for a campervan fridge?
Fuse size depends on the fridge specification and the cable size being used. Most 12V compressor fridges in campervans are commonly fused in the 10A to 15A range.
| Fridge Circuit | Typical Fuse Size |
|---|---|
| Smaller 12V compressor fridge | 10A |
| Larger / longer-run fridge install | 15A |
Typical campervan fridge wiring layout
In many conversions the fridge is mounted in the kitchen unit or side furniture, which means the cable run may be longer than a simple battery-to-appliance sketch suggests.
Rear leisure battery → fused fridge circuit → compressor fridge in kitchen unit
Should a 12V fridge connect directly to the battery?
In most campervan systems, the fridge is usually connected through a dedicated fused circuit from the fuse box or distribution panel rather than directly to the battery terminals.
- Keeps the wiring tidy and easier to maintain
- Allows correct fuse protection
- Separates the fridge from other appliance circuits
- Makes diagnostics easier later
What matters most is that the fridge has its own correctly fused cable run and sufficient cable size.
Common 12V campervan fridge wiring mistakes
- Using cable that is too small
- Ignoring voltage drop over longer runs
- Sharing the fridge on an overloaded circuit
- Using poor-quality connectors
- Incorrect fuse sizing
- Assuming low running current means cable size does not matter
Helpful calculators for 12V fridge wiring
Related campervan wiring guides
Plan your 12V fridge wiring safely
Correct cable sizing and fuse protection improve fridge reliability and reduce voltage drop 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 campervan fridge installations.
Every campervan electrical system is different. Fridge current draw, cable length, battery condition and fuse protection should always be checked against manufacturer specifications and your specific installation requirements.
Where battery systems or appliance wiring circuits are involved, installation should be completed or inspected by a suitably qualified installer.