Self Discharge Rates [RE-wrenches]

[Travis Creswell, Ozark Solar]

Concorde claims that their AGM product self-discharges at less than 1% per
month.   I recently hooked up set of 12 volt 255 amphour that had been
stored for over a year with no charging and they are doing fine.  I did have
to take them through a few easy cycles to get their voltages evened up but
they seem to be doing great now.  I'm not recommending this but I was very
happy that they survived.  I think the key was they were stored in a
warehouse all winter which never got to far from 60 f.  Based on how many
amp hours I had to put back in this set I wouldn't argue with that 1% number
too much.

What about flooded batteries?  Does anyone compensate for their high self
discharge when sizing systems?  Ed Mohoney from Concorde claims that they
self discharge at 25% per month especially as they get older?  Anyone agree
with that?  What is a reasonable number I'm pretty sure NiCads are even
worse.  I like the Concordes and have found them to be really tough but they
are lot more money than L-16's.

Travis Creswell

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