Wednesday, April 16th, 2014 - 6:02 am 
(Arizona time)

meltdownPhoto at left shows the situation after a battery discharge
test at 300 amps was terminated on a 1530 AH IBE battery string when one post melted.

During the discharge test all cell voltages are logged. The sum of the cell voltages was 2.73
volts lower than the 48-volt string voltage. This is an average of 118 mv per inter-cell
connection, 5-10 mv is the normal range in a properly connected battery bank.

Lesson learned: Bolts are not for current carrying.
Bolts are to hold lugs, etc. in tight contact with electrical terminals.

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View with bolt removed. Shows where
battery lead terminal was melted.

Detail of the low-cost battery connections.

AzSC Blog

The Tucson Solar Potluck: A Who’s Who of Solar in Arizona

On April 26, the Tucson Solar Potluck will be held in the desert north of Tucson.  It is the 32nd straight year for the gathering of solar enthusiasts, a streak that some believe qualifies it as the longest continuously held solar event in the U.S.

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