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Apr 15, 2015 at 7:46 vote accept Ehryk
Apr 11, 2013 at 2:45 comment added Russell McMahon @BobbiBennett - Yes. Approaching 150 Watt per square metre for the better ones. Even slightly less if you use 23% rear contact cells. So say 3 m^2 gives 450 Wmp. With DC direct connect and panel loaded to 12V you get 2/3 of Wmp so you'd need 675 Wmp or so. On average that gives about 2 kHw/day. $US0.50/day at $US0.25/unit. More if you can get more per unit for your power. If all adds up, but, 1st, you'd have to pay for it.
Apr 11, 2013 at 0:53 comment added Bobbi Bennett Don't forget just how -big- 500W of solar panel is going to be! Would have to rent the neighbor's gazebo roof for it.
Apr 10, 2013 at 23:56 history answered Russell McMahon CC BY-SA 3.0