RE: [amsat-bb] Be prepared for the worse + ao-40 BATT

[Wayne Estes W9AE <w9ae@xxxxxxxxxxxxx>]

Luc Leblanc wrote:

We try to figure out how much 
power BCR'S  can dissipate when charging in the present batteries configuration? Taking in account the main 
one with failing cell (s) and AUX in a deep discharge condition. Is the current flow needed in thoses 
conditions can exceed BCR capacities? knowing without BCR it will be nearly impossible to recover any 
batteries. 


Wayne replies:

It is true that heat dissipation of the BCR goes way up when the battery voltage goes way down.  But keep in mind that the existing charge current is reported to be 6 Amps, and that is with the solar panels in the "folded" state where only 2 or 3 of the 6 solar panels produce power at any given time.  The BCR was designed to withstand the charging current with deployed solar panels, where all 6 solar panels generate power.  The maximum current of the deployed solar panels must surely be much more than 6 Amps.

So the BCR power dissipation when "non deployed" solar panels charge the "bad" main battery may be similar to the BCR power dissipation when "deployed" solar panels charge a nominal" main battery.

Wayne Estes W9AE
Mundelein, IL, USA
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