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Author Topic:   Automatic Charging Relays
khicks posted 11-11-2006 01:20 PM ET (US)   Profile for khicks   Send Email to khicks  
Automatic Charging Relays, the best thing since sliced bread [versus] the isolating diodes? I am not sure. There are two terminals marked A and B. A being the primary terminal that I have as my alternator and my house banks connection. B terminal goes to the start battery. I also have a two-bank smart charger connected to A and B. My concern is that when on engine power (alternator), and A bank is fully charged (13.6vdc), and B bank is low (11.9vdc), how can the ACR prevent overcharging the A bank?

At least with the older two-bank diode isolator, when one battery bank was fully charged, its diode was no longer forward biased, therefore limiting its charge while continuing to charge the second battery bank.

Does this make sense?

Chuck Tribolet posted 11-11-2006 07:48 PM ET (US)     Profile for Chuck Tribolet  Send Email to Chuck Tribolet     
I thought an ACR would have four connections:

Battery 1
Battery 2


jimh posted 11-11-2006 11:06 PM ET (US)     Profile for jimh  Send Email to jimh     
I think the application being described is a voltage sensitive relay (VSR) which connects two batteries in parallel so permit the second battery to receive charging current.

Then the two batteries are connected in parallel, most of the charging current should flow into the battery with the lower terminal voltage. And some of that current could come from the battery which has more charge.

pglein posted 11-12-2006 02:22 PM ET (US)     Profile for pglein  Send Email to pglein     
When running on engine power and the switch in the ACR is closed, the banks will equalize rather quickly. I wouldn't worry about overcharging the the A bank.

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