If you can directly use the DC from the panels (ideally ~250vdc) then literally anything to make them more efficient is worse then just more panels.
Applications that directly use DC from PV arrays is cheap, ac grid tied solar... not so much.
Applications that directly use DC from PV arrays is cheap, ac grid tied solar... not so much.
Direct DC is very underrated in America. Almost everyone I know with solar panels is grid tied and they're missing out. Antique belt drive shop tools are cheap, relatively easy to restore and maintain, and lend themselves to solar conversion (just add DC motor). Only downside is that you can only work while the sun's shining.