Campervan Solar Panel Wiring Diagram
This guide explains how to wire a campervan solar panel safely using a charge controller and leisure battery system. Learn correct fuse placement, cable sizing basics and typical UK solar installation layouts.
Campervan solar panel wiring at a glance
| Component | Purpose |
|---|---|
| Solar panel | Generates DC charging power |
| Solar cable (4mm² or 6mm²) | Transfers panel output safely |
| Solar charge controller (MPPT) | Regulates charging voltage |
| Fuse protection | Protects wiring near battery |
| Leisure battery | Stores solar energy |
Simple campervan solar panel wiring diagram
Solar panel → solar cable → MPPT controller → fuse → leisure batteryHow campervan solar charging works
Solar panels produce DC power during daylight hours. This power travels through solar-rated cable into a charge controller which regulates voltage before charging the leisure battery.
- Panel produces variable DC voltage
- Controller regulates charging safely
- Battery stores usable energy
- Appliances run from leisure battery
What cable size do you need for campervan solar panels?
Most campervan solar installations use either 4mm² or 6mm² solar PV cable depending on panel size and cable length.
| Panel Size | Typical Cable Size |
|---|---|
| Up to 150W | 4mm² |
| 150W to 300W | 6mm² |
| 300W+ | 6mm² to 10mm² |
Recommended solar cable options: 4mm solar cable and 6mm solar cable
Typical campervan roof solar wiring layout
Most campervan conversions mount the solar panel on the roof and route solar cable down to a charge controller installed near the leisure battery.
Roof solar panel → cable entry gland → MPPT controller → leisure batteryWhere to place the solar charge controller
Install the solar controller close to the leisure battery to minimise voltage drop and improve charging performance.
- Short battery cable improves efficiency
- Reduces voltage loss
- Improves controller accuracy
- Safer fuse positioning
Common campervan solar wiring mistakes
- Using automotive cable instead of PV cable
- Installing controller too far from battery
- Missing fuse near battery connection
- Incorrect cable sizing for panel length
- Poor roof cable entry sealing
Helpful calculators for campervan solar wiring
Related campervan wiring guides
Plan your campervan solar wiring safely
Correct solar cable sizing and controller placement improve charging performance and system reliability.
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 solar installations.
Every campervan electrical system is different. Solar panel output, controller type, cable length, battery chemistry and fuse protection should always be checked against manufacturer specifications and your specific installation requirements.
Where battery systems, solar charge controllers or high-current DC wiring are involved, installation should be completed or inspected by a suitably qualified installer.