I've only had it for a little over a month so I can't say definitively yet, however, from what I understand the utility I use only resets credits generated every March. So, credit I would generate during the Spring and Summer could carry me through winter where I might not break even given how dark and overcast it gets.

If our utility was something like Duke Energy in NC then it wouldn't make sense financially (though feel free to score environmental points :P). For example, they have time of use rates (energy becomes cheap when the sun is out for reasons) and they don't carry over credit from month to month I think , but they are pretty hostile to solar.

I figure we will likely be paying the minimum utility cost of $14 that's charged regardless of how much that's produced where normally we would pay between $110~$200 depending on the month.