Update - after 2 days of sitting/driving in the sun, no cracks - well, no spreading of the cracks I created. I will take it on the highway tomorrow up to 70 mph so hope everything goes well. I also noticed that since this raised the back end of my roof by about 8mm(the roof curves steeply there so I put washers beneath the plexi and didn't make it conform to the roof's curve), I need to put a couple of washers under the leading edge of my Kammback - it was very perfect and smooth, but now there's a drop-off.
I got the wires ready to install a charge controller, just have to wait for a paycheck to purchase the kit that Daox pointed out.
I also decided on a use for the spare 7.5V string I have up there until I install more on the hood or Kammback - charging my daughter's EV (power wheels ATV) - it's a 6V battery.
