Panels are brand new! They qualify for the federal tax incentive. They are UL listed for Grid Tie installation.
What is grade B though? Grade B panels have visual defects that do not affect performance. Cell spacing could be off, could be a scratch on the frame, etc.
Data sheet HSPE-132HC-M10-SL-Monofacial-Rev.02
Model: Heliene 132HC M10 SL Monofacial Module
Max Series Fuse 30A
Cell type is Mono-crystalline PERC
2094 x 1134 x 35 mm (82.44 x 44.65 x 1.38 inch)
27 kg (59.5 lbs)
MC-4 Male and Female connectors