Our 20 Watt economy DIY solar power kit for do-it-yourselfers on a budget. Includes all the parts to build your own system to solar power lights, radios, laptop computer, fan and lots more. charge cell phones, iPad, iPod GPS. We've made it very easy to put together with complete instructions.
What could you power? If the 20 watt solar panel received 5 hours per day of full sun, then you would have:
1.2 amps (20W panel) X 5 hrs sun = 6 amp-hours/day
6 X 12V = 72 watt-hours per day. If you were using a 15 watt 12V compact fluorescent bulb then you could light the bulb for 4+ hours with the energy you produced that day. But you have a battery! Since the battery holds 18 amp-hours or over 200 watt-hours of energy, you could light the light for 10+ hours before you need a charge, but it's better to charge it sooner. You get the idea - the sun puts watt-hours into your battery and then you use it to power stuff that uses watt-hours. Energy in, energy out. The charge controller prevents the 12V sealed lead-acid battery from over-charging. Perfect for beginners that want to get started in solar but don't know where to begin. Customize your own system. House the battery and components in a small cooler or build a wooden box. Cut a hole and mount the panel voltage meter, and weatherproof with silicone sealant from the hardware store. Makes a great demonstration system to show how a basic solar energy system works.
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All prices are in USD.