When your engine is switched off, the relay will isolate your leisure battery(s) from your main starter battery. So it does not drain your main starter battery and you will always be able to start your vehicle.
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6000W4000W Solar Panel Inverter Kit – Complete Off-Grid Power System with Charge Controller & Battery Compatibility
Aliexpress UK
Dual Battery Isolators also feature surge protection and a L.E.D indicator designed to alert the user when the unit is engaged. When your engine is switched off, the relay will isolate your leisure battery(s) from your main starter battery.
eBay
CN3065 Mini Solar Lipo Charger Board Lithium Battery Charge Chip DIY Application Kit Charging Board Module
Aliexpress UK
Your engine is running. When your engine is switched off, the relay will isolate your leisure battery(s) from your main starter battery. So it does not drain your main starter battery and you will always be able to start your vehicle.
eBay
1-10PCS Mini Solar Lipo Charger Board CN3065 Lithium Battery Charge Chip DIY Application Kit Charging Board Module
Aliexpress UK
When your engine is switched off, the relay will isolate your leisure battery(s) from your main starter battery. So it does not drain your main starter battery and you will always be able to start your vehicle.
eBay
Mini DC 5V 2.4A Charge/Discharge Module 3.7V 4.2V 18650 Li-ion Battery Power Supply Module Type C DIY Electronic Kit
Aliexpress UK
Dual Battery Isolators also feature surge protection and a L.E.D indicator designed to alert the user when the unit is engaged. When your engine is switched off, the relay will isolate your leisure battery(s) from your main starter battery.
eBay
20 Watt 12 Volt Solar Panel Kit Monocrystalline Solar Panel + 30A PWM Charge Controller + Battery Clips 22% High-Efficiency
Aliexpress UK
6mm sq Red cable Power Feed (5m long). The kit has everything that you need to install a split charging system in your vehicle including a relay that prevents your main battery from draining while the engine is stopped.
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200 Watt Solar Panel Kit 12V / 24V 20A Charge Controller Extension Cable 200W Flexible Solar Panels Module for battery Charger
Aliexpress UK
Suitable for most 12V charging systems- Surge protection. Dual Battery Isolators also feature surge protection and a L.E.D indicator designed to alert the user when the unit is engaged. When your engine is switched off, the relay will isolate your leisure battery(s) from your main starter battery.
eBay
Suitable for most 12V charging systems- Surge protection. Dual Battery Isolators also feature surge protection and a L.E.D indicator designed to alert the user when the unit is engaged. When your engine is switched off, the relay will isolate your leisure battery(s) from your main starter battery.
eBay