It may be cheaper to simply recharge batteries with cheaper night rate power if it's available in your area, and buy a $1000 generator to use in emergencies.
A friend of mine spent $14K on a solar system. We worked out that I saved roughly the same amount switching to Flick and time shifting some load, though that was when line charges were cheaper at night.
you must have been paying quiet a lot before hand. even over 10 years thats $1400 per year, $116 per month, thats a aweful lot.
that would be about 1/2 of our current powerbill.