It's funny the quote we got was 75,000 (original price 98,000. Our electric bill is 400-500/month. We would have qualified for a tax credit bringing the cost down, so to actually 'save' money, we would need about 10 years (calculated by the vendor). He also then said 'of course after 10 or so years, the panels may need reparing/replacement, but that generally they should last 25-30 years. In the end we decided against it since we probably won't be in this house in 10 years.
In 10 years the tech could be 10x more efficient and 1/4 the price. Who knows