Re: [Amel] Running both battery chargers at the same time?

Anne and John Hollamby <annejohnholl@...>

Hello Jose,
The correct advice is to use the 50 amp charger when running the generator and after a minute add the 30 amp one. When the charge rate falls to about 25 amps turn off the big charger. The 30 amp charger will be enough in a marina as it will be working for much longer. Incidentally Olivier of Amel told us that it would take days to reach a fully charged state as the charge rate reduces as the battery fills.

Regards, Anne and John, Bali Hai SM319, Corfu

----- Original Message -----
From: Jose
Sent: Tuesday, July 26, 2011 11:49 PM
Subject: [Amel] Running both battery chargers at the same time?

I was told to use the 50 amp charger while using the generator and the 30 amp while using shore power to charge the batteries.

A few days ago, I was charging up my batteries with the generator, I inadvertently had both chargers on at the same time. I was very happy to see as much as 70 amps going into the batteries, nicely reducing the charging time compared to using only the 50 amp one. Obviously, at some time the total charge is reduced below 50 amp and one can turn off the 30 amp charger.

Is there any risk doing this?

70 amps charge to 4 24V banks is 17 amps per bank, which is still less than the maximum recommended current for a 110 amp-hr AGM battery (C/4=25 amp).

If I am not missing something, I think this could reduce the charging time and cut generator usage.


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