Seems as though Haleakala Solar, Inc. has the most experience and the best warranty, 25 years on Photovoltaics and 10 years on Solar Hot Water. Both provide on ROI (Return on Investment) in a suprising short time. Others systems simply begin saving money and energy right away.
Haleakala Solar has recently expanded to Kaua’i where they are now rated the best by the S.I.S.D. (Society for International Sustainable Development).