Battery Fuel Gauge [RE-wrenches]

[Don Loweberg]

In a message dated 11/3/2006 8:20:53 AM Pacific Standard Time, 
danbob at otherpower.com writes:
I usually recommend the TriMetric or Pentametric from Bogart 


Going back to Joel's original post-- The fuel gauge products already exist 
and I do agree that watts and watt hours are preferred for easy customer use. 

One problem with systems that are grid connected and at float all the time, 
is that indeed the meter has little function and as Bob-O already remarked, 
does not account for selfdischarge.

 In my mind the only way to know capacity with sealed batteries is to 
excercise them by testing. Simulate an outage , note the loads, and then see how long 
for the voltage to drop to a designated cutoff point. Then a person knows how 
much backup to expect. Without testing on a regular basis, the reserve or 
backup capability of a grid connected system becomes unknown over time no matter 
how well the original design attemped to predict it.


Don Loweburg

[Non-text portions of this message have been removed]


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