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  Another 2 bank/isolator but different question.

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Author Topic:   Another 2 bank/isolator but different question.
elmwood posted 07-25-2009 09:19 PM ET (US)   Profile for elmwood   Send Email to elmwood  
Hi all,
Ok I'm completely updating my batteries, charger and switch. I'm adding the Blue Sea 7650 (add a battery) switch, Lifeline AGM Batteries and new charger. The old charger died, I have always killed batteries every year and didn't like the old 1/2 off switch. I have a Four Winns 258 Vista cruiser and enjoy spending time on the boat. The batteries I've added are starting battery and 2 6v 220 amp house batteries (wired in series for 12v before anyone asks). The charger is a Xantrex Truecharge 2 40 amp capable of charging 3 banks. Now for the question. From the way it is stated on the Blue Sea data sheets is that the 7610 (AGR) will combine the two banks for charger purposes but I'm wanting to have the batteries separate for charging (from the electric charger) and only the batteries combined while charging from the alternator. Blue Seas diagram shows only having to connect the charger to one bank and both will charge, hence the combiner. I would like to control the two banks as to which one will and won't be charged while plugged into shore power. Another is that the charger can tell which battery needs more help than the other.

Am I wrong in thinking about separating the two banks for the charger? If it is a good idea then how would I separate the AGR from the system while charging from shore power. Would a disconnect switch for the negative connected to the batteries be the answer? Should only one switch be needed or both batteries have a disconnect and then connect the charger directly to the batteries and not connecting to the positive on the battery switch.

I believe I've read every thread on this board concerning batteries and switches and chargers and could not find one remotely talking about something like this. Tell me if I'm wrong if I am but then the charger would only be needed to be placed on one positive on the switch and that then would charge both banks. In the future I'm planning on putting a battery monitor such as the Xantrex Pro Monitor to manage and keep track of my house bank. I will also be adding as soon as it becomes available the remote panel for the charger.

Thanks for any help,
Eric (elmwood)

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