We have two 400 watt Grape solar kits installed for the last four years and live completely off grid on Mount Rainier. We have never had a problem and even the cloudiest of days our battery bank is charged. I wouldn’t go anywhere else, they know their stuff and can help with any questions. Thank you for making such a great dependable easy to install kit! My son and husband designed the solar array sun tracker frame and we ordered the Rolls Trojan batteries and these panels on a sunny day can charge them in about 15 minutes to full. We can run our camper on the excess energy easily using the inverter. Beautiful system and all we hear is the sound of the birds and river! Love the quality and so glad we choose Grape Solar a USA company!” —Brad