Your vehicle’s starter battery is designed to start the engine, not to steadily power lights, tablets and water pumps while you’re parked. A campervan leisure battery setup keeps living-area demands separate, helping leave the starter battery ready for your next journey.
A simple, dependable way to keep your essentials running matters, whether you’re travelling between campsites or spending time off-grid. The right system depends on what you use, how long you stay parked and how you recharge, so there’s no single layout that suits every van.
This guide explains how a leisure battery works alongside the vehicle battery, and how split charging, solar panels and campsite hook-up can help recharge it. You’ll also learn what battery monitoring can tell you, what to consider when sizing a battery, and how an assembled electrical system can bring the components together in a considered setup for your travels.
Frequently Asked Questions
What is the difference between AGM, gel and lithium campervan batteries
At 50% depth of discharge, a typical AGM battery is estimated to provide roughly 500 charge cycles, compared with roughly 1000 for gel and about 1150 for lithium-ion. Lithium charges at nearly 100% efficiency, compared with 85% for most lead-acid batteries.
What UK electrical safety rules apply to campervan leisure battery installations
The relevant UK regulations are BS 7671: IET Wiring Regulations. The guide cites Article 721.521.1 for flexible cables in vehicle DC wiring and Article 433.1.1 for fuses or circuit breakers near leisure-battery terminals to protect wiring.
How much does a campervan leisure battery setup cost in the UK
The material gives no overall cost for a complete campervan leisure-battery setup.
How to size a leisure battery for a campervan in the UK
Estimate your daily use and how many days you want to stay off-grid, then account for the recommendation not to regularly discharge below 50% state of charge. The guide’s example uses about 98Ah per day and calculates 392Ah for two days off-grid; 100-200Ah is the most commonly installed capacity range in the cited study.
How to calculate campervan battery capacity from daily power use
Add the watt-hours used by appliances each day, then convert that total to amp-hours at your system voltage. The example uses 1185Wh per day, which is about 98Ah at 12V.
What fuses and cable sizes are needed for a campervan leisure battery setup
Use flexible cables for vehicle DC wiring, and fit fuses or circuit breakers close to the leisure-battery terminals to protect the wiring.
What are the risks of lithium leisure batteries and how can they be prevented
Lithium batteries can ignite, burn or explode if overheated, punctured, crushed or accidentally overcharged. Avoid these conditions, and prevent overcharging, short circuits, submersion and damage, which can also create a fire risk.
How to wire a campervan leisure battery to a split-charge relay or DC-DC charger
Use flexible cables for vehicle DC wiring and place a fuse or circuit breaker near the leisure-battery terminals to protect the wiring. An ignition-triggered relay closes when it receives a 12vDC ignition signal; a voltage-sensitive relay closes at 13.7vDC. A DC-DC charger stabilises variable smart-alternator voltage for charging.