Smart battery isolator override wire7/25/2023 Personally we use the Redarc 200 amp isolator with a switch in the cabin to manually connect the extra batteries when extra battery power is needed for winching. It is handy having a shop do it to know that you are protected by their insurance against shoddy amateur work. Just check that the wiring is properly shielded and protected as some autoelectricians are not familiar with need for added protection against rodents eating the insulation and from added stone or stick damages etc. The autoelectrician will know the correct size wire. The wire should be a heavy gauge than normal power. May I suggest that you get an autoelectrician to supply and install both the isolator and the rear anderson socket and wiring. Our anderson socket is powered from the auxilary or as we call it the accessory battery as it powers all the 4WD accessories leaving the original vehicle wiring untouched. The power for the rear socket should be run from one of the batteries through a fuse or similar over current safety device and then through a new switch and finally to the rear anderson socket. The isolator only controls the power between the batteries. Will it be a dual battery system? Will the isolator be controlling a power outlet at the back of the car? What do you want your system to do? It would help if you could tell us what you want your "under bonnet setup" to do. If I were you I'd buy a budget priced item from an Australian supplier so you have realistic after-sales service and recourse in the event of a problem. Some are name brands and just a better deal. The NJ12 and SL-12-100 on this page are examples.Īll these isolators can be purchased cheaper on eBay. They do exactly as the above, but instead of sensing battery voltage to decide when to direct power to other under-bonnet stuff, it does the diversion as soon as you turn the key. They all ($70 or $190) do the same thing.Ī smart isolator, or VSR, senses your engine battery voltage and only when it's charged enough after starting does it switch on and direct 12 volt power to your "under bonnet setup".Ī simpler solution is a so-called "dumb isolator". The cheapest one in that list would most likely suit you. At the other end of the cost scale are items like these. ABR-Sidewinder is a very reputable business member who advertises on this forum and sells these units. Note : additional black (negative) wire may be required for systems without chassis earth, such as fibreglass boats, depending on your installation.A good, smart isolator, which is in fact a "VSR", will cost you between $70 to $190. Suitable for 12V systems with a continuous rating of 140A.Īll wiring hardware and instructions included. It is provided with marine-grade hardware so it can be used on a boat or vehicle. This Voltage Sensitive Relay (VSR) kit provides everything you need to wire up your second battery, while handling the isolation during shut-off periods. Applications include, for example, 4WD’s with a 12V fridge/freezer, a boat with bright cabin lighting, or say a tradesperson’s van or ute with an inverter powering various power tools. Adding a second battery in your vehicle or boat enables you to power your electrics without flattening your main starter battery when the engine is off.
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