First hand experience here - worked with a non-profit that has a tiny solar and battery installation for a light display, and we have had constant theft and vandalism problems with it. It's not even easy to get to - those meth-heads had to work to steal the lead acid batteries and copper wire...
One prisoner costs the California taxpayer $125k/yr, all in.
Maybe the company should foot the bill for a security guard instead of asking the taxpayers to subsidize their business.
Your math implies polar winter. Solar would be a bad investment.
In remote areas if you only guard at night they will go in the day.
Looks like the vandals will have to move along to somewhere else to score some copper.