Solar Powered grid tie inverter?

If I buy a grid tie inverter and Solar Panel that puts out 200watts and it costs me about 400$ how long would it take to pay for itself?

You forgot your electric rate. Assuming 10 cents/ KWh:

200watts
8hrs/day
1.6Kwh/day
0.1$/Kwh
0.16$/Day produced
400$ purchase price
2500Days payoff

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