MICHIGAN CITY, Ind. — Hightec Solar Inc. in Michigan city in. Indianans oldest and largest solar panel manufacture is excited to announce after months of lab testing and factory inspecting by PTL labs in AZ., our 36 cell panel series has been certified to UL standards 61730-1-2017 & 61730-2-2017 these panels are very popular in the RV community and other off grid uses, with this new certification we hope to move in to the grid tie, municipality , and all other battery charging sites needing UL approved panels, each panel is shipped with a flash test sheet & A copy of its 25 year warranty