this is where i bought my systems. they use a grid intertie system which is pretty easy to set up. basically plug and play. the grid intertie bypasses the need for a battery. the energy you get goes directly into your box and the grid. so if on the off chance you make more electricity then you use the power company has to PAY you at THEIR rates. basically anytime you produce power it sends that power into the grid, since the elec company has to pay you for that power they just deduct it from your bill, penny for penny. as for the inverter i just used the one they sent with most packages tho they do have some options there.

now for the angle of the sun this is a good diagram you can use. to figure out the angles on different day's of the sun you just need to realize it goes around the sun and the sun's rays always come in horizontal (in accordance with that diagram). now note the angel of the earth's tilt is, 23 and a half degree's, that diagram is at summe solstice, so for winters solstice the earth would be 23 and a half tilt to the left, instead of the right. which means across the year the total degree of change is 57 degree's you divide 57 degrees by 365, and that's how many degrees worth of change you get per day. from there you just use some trig and your location on latitude(or was it longitude, i always mix those up) to figure out the angle of the sun.

by kingbane on 07/10/2009 04:33:13 PM EST

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