Do the build your own energy kits with solar panels and windmills work?
nowhere as good as professionally made ones. Unless you are a mechanic and a EE, just leave it to the professionals.
if i buy 2 solar panel kits of 45 watts each how much would i making in kwh?
Im trying to save money in my light bill so i'm thinking of buying some solar panels I need to produce 2000 kwh and how do i go by connecting it to my house
Others above have covered the calculations quite well.
For a real world data point, each 1000 watts of solar array in my area of northern California produces about 2000 kWh of energy per *year*.
Those little 45-watt kits from Harbor Freight, Northern Tool, etc., can be fun, but they have amorphous silicon panels, and from what I've heard, are very optimistically rated. One guy who analyzed the kit said that the panels actually returned more like 5 watts each in bright sun, for a total of 15. Also, those kits are designed to charge a lead-acid battery, and provide stand-alone electric power. They cannot be connected to hosue wiring. Given the inefficiencies of storing energy in a battery, I suspect what you would get is enough to run a laptop for maybe a couple hours a day, or a small compact fluorescent bulb for twice that.
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