I had tested some solar panels the other day. It seems they can sustain this system working: Arduino Mega+GPS+Sdlog+GPRS(sms)+LCD.
They are 1Watt units, although in my test they were .8 Watt’s in the 5 ‘o clock sun. They weight 33g a piece. Although maybe more unreliable, they might be a better power than battery’s. At $3,50 per panel, they’re almost cheaper too. Not sure what they do at -55*C though..
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