The other thing to keep in mind is that even if you are able to produce enough energy to put your net use to zero kw/h- you will still have a power bill. I'm not sure if the line items other than use go down much if you end up using less; however the point stands that if your power bill is $75 per month, you won't be able to save that by going solar. Unless of course you do go fully off grid with batteries, etc.
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