Windsun wrote:
It does not work that way because panels are rated at 17 volts, not 12. You
have to work with the panels amps not watts.


unless one has a mppt controller.

without, a 50 watt panel might produce 3a x 3h or 9ah.

9ah x 12v = 108 wh (not 150wh) into the battery, of which 86wh (7ah)
might be available for use (20% conversion inefficiency). That's less
than his needed 12ah, so a 75 watt panel would be more appropriate in
NY, but I do not know where the OP is located.

--
Steve Spence
Dir., Green Trust, http://www.green-trust.org
Contributing Editor, http://www.off-grid.net
http://www.rebelwolf.com/essn.html