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. The location is very good.
eBay
Car Relay Tester Voltage Tester ANENG RT01 Universal 11-25V Automotive Car Battery Check LED Indicator Light Relay Diagnostic
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
ANENG RT01 Universal Car Relay Tester Voltage Tester 11-25V ar Battery Automotive LED Indicator Light Relay Diagnostic Checker
Aliexpress UK
Safety Certified: CE certified with built-in surge protection, ensuring safe and efficient energy transfer. -Flexible Mounting: Surface or panel installation options for hassle-free setup. Waterproof Level: IP67.
eBay
FORWARD relays top grade quality 4 pin 30A auto relay with fuse, coil voltage 12VDC relais
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
SSR 500A 1000A DC-DC Solid State Relay Voltage DC Relay DC Battery DC Motor 500DD 1000DD
Aliexpress UK
This allows the charging of a leisure battery from your vehicles starter battery/alternator. Our VSR is dual way to allows power both ways. Continuous current - 140A.
eBay
LANBOO J13A series Intermediate relay auxiliary relay 5pin 8pin 10A 12A DC12V DC24V AC220V Custom voltage and test wrench
Aliexpress UK
Easy 3 wire connection at the battery. No need to bypass existing alternator wiring. VSR have no volt drop. Conventional diode isolators incur a minimum of 0.6 volt drop. Compact size - No large heat sink Cost effective solutionQuality products.affordable prices.
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ENMG Solid State Relay Module 5-24V DC Solid State Non-Contact Relay Module DC Control AC/DC 220V Wide voltage constant current
Aliexpress UK
For 12V Leisure Battery Capacity up to 220AH. Designed for dual battery systems. 1x VSR with fitting hardwares. CE Certified.
eBay
ANENG RT01 Universal Car Relay Tester Voltage Tester 11-25V ar Battery Checker Automotive LED Indicator Light Relay Diagnostic
Aliexpress UK
For 12V Leisure Battery Capacity up to 220AH. Designed for dual battery systems. 1x VSR with fitting hardwares. CE Certified. IATF16949-2016 Certified.
eBay
LCTC SSR 0-10V 4-20MA 0-5V Power Voltage Regulator Relay 10A 25A 40A DA AA DD VA Single Phase Solid State Relay With Heat Sink
Aliexpress UK