Location: Hudson, Massachusetts

Watts: 9,240

Monthly Production: 925 kWh

Date: August 2018

This roof has a Total Solar Resource Fraction (TSRF) of 89%. In other words, it’s 89% of what a perfect roof would be for generating solar. That makes it a great roof, but “lesser roofs” are now working for solar too. As panel prices have dropped, lower TSRF’s have become more economical for homeowners.

What the heck is TSRF? We’re glad you asked. We explain it here on our Energy Miser blog.