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post #1 of 4 Old 10-31-2012 Thread Starter
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Question about unevenly-sized battery banks

With the modern distributed-power chargers (I have a Xantrex TrueCharge 20A) is it acceptable to have unevenly-sized banks?

I would like to have two group 24s on one bank, and a group 27 on the other.

I currently have two 24s and two 27s which are on their last legs. To save some weight I would like to ditch one of the batteries. (adding a 60lb outboard to the stern rail so losing one battery would keep her on her lines)

Mostly daysailing so don't need a ton of capacity.

Bristol 31.1, San Francisco Bay
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Re: Question about unevenly-sized battery banks

You already had unevenly sized banks when you had two G27 and two G24s. The batteries in a bank are hard wired together and appear to the charger as a single large battery. The fact that you have one battery in one bank and two in the other is unknown and irrelevant to the charger. Also since you're going down in capacity you'll be fine. The more complicated scenario is if you had different battery chemistry (ie gel in one bank and lead-acid in another), but uneven bank capacity should be fine.
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post #3 of 4 Old 10-31-2012
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Re: Question about unevenly-sized battery banks

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Originally Posted by MarkSF View Post
With the modern distributed-power chargers (I have a Xantrex TrueCharge 20A) is it acceptable to have unevenly-sized banks?

I would like to have two group 24s on one bank, and a group 27 on the other.

I currently have two 24s and two 27s which are on their last legs. To save some weight I would like to ditch one of the batteries. (adding a 60lb outboard to the stern rail so losing one battery would keep her on her lines)

Mostly daysailing so don't need a ton of capacity.
Not an issue the current will flow where it is needed. However, despite having two outputs you still only have one charger and one voltage.

Because you only have one charger, mixing lead acid battery types such as GEL and Flooded or a battery that needs 14.8V, such as some Trojan deep cycles, and a battery that only wants 14.4V becomes problematic and you either over charge one or under charge the other. If the batteries take the same voltage, no worries..

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post #4 of 4 Old 10-31-2012 Thread Starter
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Re: Question about unevenly-sized battery banks

Thanks for the replies. good to know.

Bristol 31.1, San Francisco Bay
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