Amazon’s BEST Solar Panel Just Got... Worse? Callsun 215W Shade Tolerant Review + Testing!

Solar panel shading is one of the fastest ways to lose energy (and sometimes create hotspots), because one shaded cell/string can limit current through the whole series string until bypass diodes activate. What shading does (in plain terms) With string inverters, current is shared in series, so a small shaded area can reduce output disproportionately. ​ Bypass diodes protect the module by bypassing shaded cell groups, but they can also cause “step” losses in power (you lose the contribution of t