[amsat-bb] Re: ARISSat-1 battery

[Fabio Azzarello]

Hi all,
what about the following link?

http://www.nrel.gov/features/20100708_battery.html

73s
Fabio
IW8QKU/5


*Subject: [amsat-bb] ARISSat-1 battery
From: g0mrf at xxxxxxx
Date: Mon, 29 Aug 2011 08:50:45 -0400 (EDT)


Hi all.
The ARISSat  team seem to have reached the conclusion that the Silver Zinc
battery technology is not really suited for
an orbiting satellite with a 55 / 35 minute charge and discharge cycle. I
wonder if a couple of small
Lithium polymer battery packs would be a suitable replacement for ARISSat-2
? I
note that there are safety issues with Li-ion technology,
but there are some small battery packs of 10Whr / 20Whr 30Whr  modules which

have NASA approval for manned space flight.
>From the odd snippet of information on the power required during eclipse (is
it
7 Watts for 35 minutes) it looks like 20-25% depth of discharge for the
20Whr
battery pack. That's probably OK for a 9 month mission ??

Thanks

David G0MRF


http://www.clyde-space.com/documents/1902*