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battery switch and auto charge relay
As Im upgrading my electrical system, Ive been thinking about using an ACR. Ive just read the other thoughts here and there seems to be some confusion, at least on my part.
One person suggested that with an ACR you still need to keep the 4 position switch in order to combine batteries if the start bank was dead. With the traditional 4 way switch, you COULD choose either battery (or both together) for starting or powering house loads, though we typically had one specific bank for starting and one for house loads. The 4 position switch never let us choose which load, just which battery. By keeping the usual 4 way switch you would still need to choose which battery to use when starting and which to use for house loads.
It appears to me that if you install the complete set up you would put in a dual circuit switch which simply has ON-Off-COMBINE. The real difference is now you would wire the house bank to the house load side and the start bank to the starter side of the switch and thats how it would discharge in ON. You cant use just the house bank to start the engine or just the start bank to run house loads. You can however use both batteries together in the COMBINE position for starting the engine (the likely use for COMBINE) , or running a house load (the unwise choice for COMBINE except if charging source is a goner and one needs instruments or something equally critical on the house load side)
For chargine, in the On position, the ACR will charge whichever bank is directly connected to the charging source until the ACR detects the threshold voltage at which point it auto switches to both for charging. During discharge it isolates both batteries automatically. There really is no need for the 4 position switch as one no longer is manually choosing which bank to use. It seems there would be no using the battery switch except when the start bank goes dead or to shut the whole system OFF.
Does this sound correct and does it work this way in real life and do you recommend it? Sounds like a great idea as Im constantly forgetting to put my 4 position switch in the right setting.