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.
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LM393 5V/12V/24V Voltage Comparator Relay Module 1/2/4 Channel Volt Comparison Board for Automotive
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.
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TOMZN Din Rail Dual Display Adjustable Over Under Voltage Current Protective Device Protector Relay
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
TXB0104 4-Bit Bidirectional Voltage Level Converter Automatic Direction Sensing WCMCU-401
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
NEW Version! DC 12V 24V LED Digital Relay Switch Control Board Module Relay Module Voltage Detection
Aliexpress UK
It simply connects between the two batteries. The relay is connected between the vehicles main battery (Positive) and the leisure battery (Positive). Permanent live output (a live feed via relay from main battery + generally never used).
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Voltage relay Single-phase solid state relay Transparent shell plastic cover shell Small solid rail
Aliexpress UK
(via a fuse!). and link to the leisure battery. Fully epoxy sealed unit for years of trouble free service. Bi-Directional, zero loss Split Charging. Only 3 Connections to make. Sealed for marine/under hood installation.
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LCTC Solid State Relay SSR DIN Rail Slim Relay 15/25/40A 0-10V 0-5V 4-20MA Voltage Regultaor Thin
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
DC 9V 12V 24V Digital Voltage Control Relay Module Relay Switch Control Board Module LED Voltmeter
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
DC 6~80V Voltage Monitoring Relay Time Delay Relay Charging Discharge Controller Module Undervoltage
Aliexpress UK