camper battery isolator relay wiring diagram

#CAMPER BATTERY ISOLATOR RELAY WIRING DIAGRAM MANUAL#

If paying an auto sparky to do the installation, a VSR is probably cheaper as is so much quicker.

#CAMPER BATTERY ISOLATOR RELAY WIRING DIAGRAM MANUAL#

Of the three options (VSR, Simple relay or Manual switch), my preference is a 'Forget about it once installed - so its VSR for its simplicity and therefore lack of screw up potential. You must switch the relay off a circuit that is only active when the engine is running - Aux or Ignition circuits that are active while cranking will cause cranking amps coming out of the house battery - a slightly flat starter battery and most of the amps will try to come from the house battery.

Difficulty and time depends on the vehicle and availability of circuit diagrams. The relay is cheap, but requires you to connect to the vehicle wiring loom. The VSR is more expense to buy, but much simpler and quicker to install. Once installed, both can be forgotten about. I have used both a VSR in my current setup, and a simple relay switched off the run/stall circuit of the engine in earlier setups (Both Tugs for caravan but electrically no different) The 'usual' use of such a system would be to parallel the batteries whenever motoring and run the House system on Battery 2 at all other times - but no harm would be done if the switch was ever inadvertently left in the 'wrong' position. Such a switch also saves the expense of fitting a separate 'Emergency Parallel' switch. Total failure of either battery would not cause any loss of functionality. Simply paralleling both batteries (and leaving them paralleled) will give you a lot more 'House' battery capacity and more cranking power for engine starting. The switch also functions as a 12v 'Mains' switch, so saves you that extra expense. When set to ALL, the engine will be charging the House battery.Īny solar power can easily be shared with the Starter battery, should this ever be desired. Should your Starter battery ever need assistance, you have the ability to connect both batteries in parallel for extra cranking power. You can run your House electrics on either battery, or on both connected in parallel. The balanced circuit electronic isolator is the absolutely the best way that proper isolation and control can be accomplished, solving every multi-battery drain problem.īatSwitch.JPG (6.8 KiB) Viewed 2656 times With this system, the alternator is protected, the batteries are protected. Each battery then determines the amount of current which flows into it by its own state of charge based on the voltage regulator setting. When the alternator is charging, current can only flow from one direction, from the alternator to the batteries. So no matter how drained your accessory batteries become, they will never drain power from the battery you’re depending on to start your engine. Each battery is isolated and acts as an independent power source. To eliminate the multi-battery drain problem, a battery isolator acts as a check valve between the batteries, preventing the current from flowing from one battery to another. This problem is known as multiple battery drain and could leave you with dead batteries. Without a battery isolator a battery with a lower charge will rob power from a battery with a higher charge, until the batteries equalize. Many vehicles have multiple batteries: one to start the engine and others to power accessories.

Camper battery isolator relay wiring diagram