On 11/04/17 00:14, king_of_neworleans wrote:
>
>
> As for rotating them periodically, I certainly don't see what it would
> hurt. Just a couple hour's work a couple times a year. I can't point
> to any definite benefit, though, from my own modest knowledge base.
> Anyway it would make an interesting experiment. Swap the end ones in
> reverse order and see if the previous positive end batteries are still
> as thirsty when moved to the negative end of the string. I for one
> would be interested in your findings. Before you do it, you might try
> to record empirical data in great detail, even data that you presently
> don't think is important. You never know what comparisons you might
> later want to make. When I do stuff like that I never make enough
> notes, and a year later I don't understand what I recorded, or how.
I have a 36v system using 6 x T145s. After reading on this list of
people having the batteries one the string ends fail before the others
for reasons unknown, I've been 'rotating' my batteries one position at
the start of every season. The set of T145s have been in service since
November 2008.
I must admit the duty cycle is very light. I'd be lucky to operate the
boat 10 times a season. I think the maximum depth of discharge has been
70%. Normally a day out will be between 50 and 60%.
The batteries are charged the evening after a day out by a DeltaQ with a
Trojan charge profile. It 'balances' the string approximately once a
month (by a controlled over charge). Most water loss is due to the
balance cycle.
Posted by: Matthew Geier <matthew@acfr.usyd.edu.au>
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