[RE-wrenches] discharging Rolls batteries

[Hugh]

Hi Jamie and Dan,

Thanks for keeping up this thread!  And sorry for being impatient.

Now, if the capacity 'loss' is simply due to reduced performance, is 
it logical to say that one can push the battery to lower voltages 
under low temperature conditions without actually cycling it harder 
or reducign its life that way?

On the question of inverter temperature compensation for discharge 
set points, these would surely be adjusted downward in low 
temperatures whereas the charging setpoints are adjusted upwards.  I 
had never heard of such adjustment to discharge setpoints (low 
battery disconnect, genstart, etc).  I would be interested to know if 
this type of temperature compensation exists and indeed whether it is 
legitimate in terms of sustainable battery management.

Hugh

>
>Hugh,
>
>
>Sorry if you found my response limited but have been traveling since 
>early this am and don't have all information at hand, at the moment.
>
>
>Regarding temperature effects on capacity, earlier responses are 
>spot on as the lower capacity is totally as a result of slower 
>reaction times as a result of lower temperatures.  
>
>
>Approximate Temp effects;
>
>
>40C = 104%
>
>25C = 100%
>
>5 to 10C = 90%
>
>-5C = 80%
>
>-22C = 60%

-- 
Hugh Piggott

Scoraig Wind Electric
Scotland
http://www.scoraigwind.co.uk
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