[aprssig] Solar Powered Digi's.

John Ronan jronan at tssg.org
Tue Dec 4 20:47:09 EST 2007

On 5 Dec 2007, at 01:23, Robert Bruninga wrote:

>> the 'average' Sun hours per day here is about 3.75.
>> ... size the battery so that it never gets
>> discharged below 80% on that figure.  And then...
>> size the panel so that it could recharge the
>> battery from roughly 80% discharge on a 3.5 hour
>> day of sun.  Does that sound reasonable?
> All but the last part.  (Depending on what "80% discharge
> means.)  If you mean to "recharge the battery from its 20% depth
> of discharge (80% f capacity) back to 100%, then that is about
> right.
> But if you were saying 80% discharge (20% of battery capacity
> remaining, and then trying to make up the full top 80% in one
> day, then you will be sepnding 4 times what you need on solar
> panels.
I meant the former, apologies for being unclear.

de John

John Ronan <jronan at tssg.org>, +353-51-302938
Telecommunications Software &  Systems Group,  http://www.tssg.org

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