"Udo Rumpf" wrote in message
:

If I want to maintain a 12 volt 7amp/h Battery with a solar cell panel
what rating would I need during flight, if after 4 hrs I wanted
to have a usable, not full, charge in my 12 Volt battery.
Right now, my as good as new battery is useless after 4 hours.
and what size would the panel be?

Udo



Udo,



Most battery manufacturers consider their battery to be depleted at
around 10-10.5 volts. I usually switch to my secondary battery when the
primary depletes to around 11.2 - 11.5V. I also agree with other
posters here that unless you have a transponder or something you should
not be drawing anywhere near 1.1 amps typically. In situ measurements
may be called for.



Larry