@WandererUber @sickburnbro >south europe
Yeah I've heard the breakeven stats only really apply close to the equator.

>efficient
Any stats on how much less efficient?

I don't really need a map since it's obvious the solar flux is highest at the equator. There's also weather to contend with shortening the productive time per day. Not to mention how residential solar is mostly installed on angled roofs which only get the proper light a portion of the day. Combining that with the degradation of efficiency it probably does get pretty piss-poor after a while. What's the cutoff voltage for replacement in the warranties?