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#12V BATTERY ISOLATOR SWITCH HOW TO#
#12V BATTERY ISOLATOR SWITCH INSTALL#
#12V BATTERY ISOLATOR SWITCH FULL#

This list is of what people reported their wire size was, alternator size was, and the most amps they have seen going to their battery: Alternator Size 87% of the answers were estimated to be 92% inaccurateīut… I gathered the following data: Wire size to reported amps:.21% would rather give me irrelevant advice rather than answer my question.18% didn’t know the difference between amps and volts.

#12V BATTERY ISOLATOR SWITCH HOW TO#

50% of respondents didn’t know how to find out how many amps they were charging at.

So, what did I do? I reached out to various camper van facebook groups, THE home of Questionablly Reliable Crowd-Sourced Data. More specifically, I wanted to find out what the max amps people have ever seen going from their alternator to their batteries. I wanted to gather some real-world data from those who were charging their house batteries with their alternator. With 2/0 wire, as long as the house battery bank is kept within 12 feet of the starting battery, even at charging rates up to 149 amps, a 3% voltage drop will still be achieved. Most applications will never see amps that high nor are most alternators capable of putting out that many amps. 2/0 wire with 105☌ insulation under 50 feet in length is capable of handling currents of up to 330 amps. 2/0 wire will be enough for 95% of applications. Wire size for Battery Isolatorīlanket Statement: Use 2/0 wire. Lithium Battery Isolatorĭue to the resting voltage rates of Lithium Batteries, you’ll likely want a lithium battery specific Isolator.Īlthough a normal battery isolator shouldn’t ‘damage’ your lithium batteries, it simply may not disconnect properly when your engine is off as it may see the higher voltage of the lithium batteries as ‘charging’, which will keep the batteries combined. It will typically be stamped onto a metal plate on the alternator itself. The max amps your alternator will output can sometimes be found in the spec sheet of the vehicle. Size your battery isolator to handle the max amp output from your alternator.

#12V BATTERY ISOLATOR SWITCH FULL#

Although you’ll likely never see your full alternator output amperage going through your isolator, it’s really the only base line you’ve got. Your battery isolator will depend on the size of your alternator. This number is simply the amount of potential amps that could be flowing through the device from your alternator to your house battery bank. Most Battery isolators are rated in terms of amps. You can check that out here: How to Choose a Battery Isolator for a Camper Van: If you want to check out that step by step guide, you can do that here: Īlso, we have interactive solar wiring diagrams that are a complete, A to Z solution for teaching you exactly what parts go where, what size wires to use, fuse size recommendations, wire lug sizes, and all kind of other stuff to help save you time and frustration. If you’ve just stumbled on this article directly without seeing that, there are likely some things we’ve already covered.

#12V BATTERY ISOLATOR SWITCH INSTALL#

This is just one part of an overarching “How to Install a DIY Camper Van Electrical System” series. Not sure what dual battery system is best for your vehicle? Let Shaun Whale explain more.A Battery Isolator combines the ‘house’ battery bank that runs your lights, fans, refrigerator, computers and such to your starting battery so it can be charged by your vehicles alternator.

Silver contacts ensure longer life and suitable for marine applicationsįor help in choosing the best dual battery setup for your needs, use REDARC's vehicle selector tool.

Safely maintain the charge your dual battery system with the Smart Start SBI12 battery isolator. A low standby current draw and fault detection and LED indication of operation warns users of faults such as voltage drops, over-voltage, and excessive current draw conditions.

Due to the voltage drop associated with diode type isolation, it’s better than a diode battery isolator. It incorporates electronic components that prevents the solenoid from generating high voltage transients. The battery isolator is mostly used in 4WD and commercial vehicles. The SBI range manages battery charge for your secondary battery while on the move. It is used as a solenoid priority system in dual battery systems and provides 12V DC incorporating 100A of continuous ratings. The REDARC Smart Start® SBI12 is a microprocessor-controlled battery isolator which protects the start battery from excessive discharge, while allowing the auxiliary battery to supply charge to non-essential loads.