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
1-2pcs 50W Solar Panel 100W Kit Complete 12V High Efficiency Mono Cell Flexible Solar Panels With Charge Controller PV Cable
Aliexpress UK
Car Airbag Simulator Emulator Resistor Bypass SRS Fault Finding Diagnostic KIT. 4X SRS Airbag Car Simulator Emulator Resistor Bypass Fault Finding Diagnostic UK. Note: The benefit of this type of relay is that it does not require a connection to the alternator or any modifications to the existing vehicle electrical system.
eBay
Low Voltage 600W 800W MPPT Wind Turbine Charge Controller With LED Display Auto 12V 24V Windmill Fan Regulator IP65 Waterproof
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
MPPT Solar Charge Controller 20A 30A 40A 60A 12V 24V Auto Battery Charger Input 100VDC Solar Panel Regulator LCD Display
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
POWLSOJX Dual-Battery Solar Controller - 10A/20A/30A PWM for 12V/24V Systems - Two Batteries Simultaneous Charge
Aliexpress UK
Built-in LED indication (lights up when VSR starts). 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
Solar Panel Charge Controller 12V 24V PWM MPPT 10A 20A 30A Automotive Battery Charger Regulator USB Output 5V Max PV 50V DC
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
Solar Panel Charge Controller 12V 24V PWM MPPT 10A 20A 30A Automotive Battery Charger Regulator USB Output 5V Max PV 50V DC
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. - Suitable for most 12V charging systems- Surge protection. When your engine is switched off, the relay will isolate your leisure battery(s) from your main starter battery.
eBay
10A 20A 12V 24V PWM Mini Solar Charge Controller Regulator IP68 with Cable Auto Controller Tools Solar Battery Charger
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
30A MPPT Solar Charge Controller 12V/24V Battery Voltage Max Solar Panel 100V EPEVER Regulator With MT52 Data Monitor
Aliexpress UK