[aprssig] Solar Powered Digi's.

[John Ronan]

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
EI7IG

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