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Old 01-13-2014, 05:00 AM   #15
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Watts / volts = amps
watts / amps = volts
amps x volts = watts
so, if you want to charge a 600 amp 12 volt battery with a 18 watt solar cell, 18 12 = 1.5 amps an hour for 400 hours of full sun.

http://www.campingworld.com/shopping...-18-watt/56006
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Old 01-13-2014, 10:03 AM   #16
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Quote:
Originally Posted by greggholmes View Post
Watts / volts = amps
watts / amps = volts
amps x volts = watts
so, if you want to charge a 600 amp 12 volt battery with a 18 watt solar cell, 18 12 = 1.5 amps an hour for 400 hours of full sun.

Nature Power Solar Battery Charger Kit- 18 Watt - RDK Products 40015 - Solar Panels - Camping World
The 18 watt was just something I saw, guess you can tell I know NOTHING about electricity. Just threw it out there for thought, but now I see a much higher watt solar cell would be needed for keeping the battery charged.
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Old 01-13-2014, 10:48 AM   #17
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Originally Posted by Superslif View Post
Might be good for camping off the grid. We have done some trips to the National Park campgrounds that don't have electric.
This gadget would only be effective when the vehicle is in motion. The current desing has 4 wind turbines mounted on a bar. If you had a TT you could mount multiple bars. I don't think they would be at all effective when standing still no matter what the wind. Anyway, just an idea.
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Old 01-13-2014, 10:52 AM   #18
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This gadget would only be effective when the vehicle is in motion.
Since the turbine is less than 100% efficient, the increase in drag which the engine must overcome would be greater than the power generated by the wind turbine in the case you cite. It would be more efficient to recharge the batteries from the engine alternator.

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Old 01-14-2014, 10:30 AM   #19
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Since the turbine is less than 100% efficient, the increase in drag which the engine must overcome would be greater than the power generated by the wind turbine in the case you cite. It would be more efficient to recharge the batteries from the engine alternator.

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Yep - that pesky Second Law of Thermodynamics I mentioned above.
I think Robert Heinlein said it best - TANSTAAFL - There ain't no such thing as a free lunch.
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