Re: [amsat-bb] batteries for satellite use

[Bob Bruninga <bruninga@xxxxxxxx>]

> Generally the comments have been that Nicads are a known quantity (
> OSCAR 11 has now gone past the 70,000 cycle mark...

Curious, what is the nominal depth-of-discharge of UO-11?

PCsat was designed for 25,000 cycles with a depth-of-discharge of 20%,
but... the failure of one solar panel trashed that design... :-(

To date PCsat has been through 4,200 cycles BUT probably half of those
are deep discharges well below .9 volts per cell and we dont know how low,
because we lose telemetry below 1.0 volt per cell and it appears that
that is only HALF way through most maximum eclipses...

We outta have a pool to guess when the first cell will fail...
Bob


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