FYI, this is the "space laser" part of the "jewish space lasers" of Marjorie Taylor Greene that left everyone laughing about how (wrongly) absurd space lasers are and forgot about the anti-semitism.
She basically said that a system like you've mentioned was tested, misfired and started wildfires. It was then covered up by some Jewish guy on the board.
How easy is it to design a solar array that stays operating (with reduced capacity) after a few mortar hits?
I would guess solar arrays in space that beam energy down are a better solution for military bases in times of war. The USA is actively working on that (https://www.livescience.com/microwave-beam-military-space-pl...)