GEARCELL Smart Dual Battery Isolator, Auto/Manual Mode Voltage Sensitive Relay with Digital Voltmeter 12V 140Amp Manual and Auto Modes Voltage Sensitive Relay VSR for RV Marine Car Vehicle Truck

This one works, I have it fitted between my 300W solar panels charging two 12 v leisure batteries and the drive battery. This is in my camper conversion , once fully charges this trips and the charge from the solar goes through to my drive battery. I tried to save money and bought a cheaper version with out a volt display. I didn't know it failed for months when I got in to trouble with a flat. Never a slow start again with this fitted and easy to see it operable status at a glance

Workers fine

This is perfect for keeping your leisure battery charged from the alternator whilst not draining your car battery when the engine isn't running. Everything you need is in the box apart from tools. The instructions are easy to follow and should be fairly quick to fit. The display tells you all the info you need and LEDs show the current mode.

So far working great good quality and very happy

This battery isolator works as intended and was easy enough to install. The interface isn't the prettiest however I've tucked it away so aesthetics aren't really a contributing factor to my allocation of stars. Seems to be of descent enough quality and I'm overall happy enough with it.

Non functioning,non works Ng on receipt of item.refund wanted

I installed this dual battery isolator in my RV, and it works perfectly. The real-time voltage display is very helpful to monitor the status of both batteries. It charges both batteries efficiently, ensuring the auxiliary battery gets charged once the starting battery is full. Installation was straightforward, thanks to the clear instructions, and I love the flexibility to switch between manual and automatic modes. This unit is ideal for vehicles, boats, and RVs, providing peace of mind when using high-power electrical appliances.

Just what I need for the split charge in my 4x4 to keep a leisure battery topped up without issues. The instructions are minimal but enough. Basically attach the ground wire to the chassis, and then wire the primary (start) battery to one end, and the secondary (leisure) battery to the other end. The second battery is then fed power once the primary battery is charged. The built in voltage display is very handy to help you know how well charged the batteries are.