Join Date: Dec 2007
Boat: Corbin 39 Special Edition
See Balmar's response to my email.
I obviously don't plan to have the two banks connected all the time, but his reply makes sense (to me). Can anyone think of any flaws in the logic?
Thank you for using Balmar products. There is really no reason to run the system with the battery switch set to both, but if you do, it will not affect the DDC as it will just go to sleep when it sees the higher voltage on the starting battery side. I would leave the switch set only to the house bank.
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Sent: Saturday, January 24, 2009 8:47 AM
Subject: Duo Charge Controller Question
I have Balmar ALT-120A alternator with a Balmar Max Charge Digital Regulator MC-612-H and a Balmar Digital Duo Charge Controller. Balmar’s Digital Duo Charge connects between the house and start (secondary) batteries -- keeping the two banks separate until the unit senses 13 volts at the house battery. Once voltage is reached, the Duo Charge supplies up to 30A to the secondary bank.
If/when I combine the house batteries with the starting battery and the engine is running, will I have to isolate or take the Duo Charge Controller off line? I don't know what would happen if the two battery banks were combined and at the same time the house batteries were supplying the Duo Charge Controller with power to charge the starting battery which is already being charged by the alternator because all the batteries are combined.
If the Duo Charge Controller has to be isolated when the house and starting batteries are combined, could that somehow be done with an AFD battery switch or would that portion of the AFD switch be too small to handle the potential 30amps that the Duo Charge Controller can put out?
Let me know how I handle this.