In addition to the above, you need to factor in your power company. If you have a for profit company like Duke or Leesburg power, you get the same price for every kWh you generate as what you pay to consume - i.e. if it's $0.13/kWh, then you get credited $0.13/kWh, so you only need to generate as much as you consume.
If you have a coop, like SECO, they aren't bound by this law. In my case, they charge $0.11/kWh, but only give you $0.08/kWh - so you need to generate far more than you consume to cover this difference. In addition, it costs $1/day to be a "member", so your bill will always be ~$30/month regardless of what you do.
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