[amsat-bb] Re: ARISSat-1 battery

[Fabio Azzarello]

Hi,
here is another interesting link:

http://www.nrel.gov/vehiclesandfuels/energystorage/news/2011/1482.html

could it be an interesting opportunity for "our birds" ?

73s
Fabio
IW8QKU/5



On Mon, Aug 29, 2011 at 3:09 PM, Fabio Azzarello <iw8qku at amsat.org> wrote:

> 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*
>