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[aprssig] Solar Powered Digi's.

Robert Bruninga bruninga at usna.edu
Wed Dec 5 01:23:47 UTC 2007


> 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.

Just making sure we are not missinterpreting...

Bob

> Regards
> 
> John
> 
> 
> 
> > 73
> > Phil - AD6NH
> > www.aprs2.net
> >
> > John Ronan wrote:
> >> Hi,
> >>
> >> I'm looking for 'rules of thumb' for solar powered digi's.
We've  
> >> been offered a site for a digi, but power on it could be an

> >> issue.  Any experience appreciated.
> >>
> >> de John
> >> EI7IG
> >> -- 
> >> John Ronan <jronan at tssg.org>, +353-51-302938
> >> Telecommunications Software &  Systems Group,
http://www.tssg.org
> >>
> >>
> >>
> >>
> >> _______________________________________________
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> >
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> 
> --
> John Ronan <jronan at tssg.org>, +353-51-302938
> Telecommunications Software &  Systems Group,
http://www.tssg.org
> 
> 
> 
> 
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