Hey there, I was playing around with the photovoltaic sail in sandbox and noticed it was providing an unusually large amount of MJ power. Something like 800 GW of power for a 5 meter (~half a ton) sail in Kerbin orbit. This WAY outclasses the solar power options from KSPIE, and even the reactors.
I think there may be a factor of 1000 error somewhere. Doing the calculation myself (1400 W/m^2, 2310400 m^2, 25% conversion efficiency) I got 800 MW of power, instead of GW. That seems more reasonable, although it's still better than anything the solar parts from KSPI can do.