Yes I bought one crate. I connected four panels to my travel trailer. They put out some good power: the most I have seen is 780 watts between the four. I have a system with a 60 amp charge controller, a 1000 watt inverter and a 900 amp hour 12 volt battery. It powers my air conditioner 24 hours if I want, my mini fridge 24 hours 7 days, and my 750 watt toaster. It makes about 4200 watts on a sunny day and I use around 3000 watts per day. Less when it’s cloudy. I leave my air on all day when it’s sunny because duh. Use it or lose it. I left the air on all weekend when I was gone to Argos IN and I came home to a fully charged battery. No worries.
My tiny house had a metal roof on an OSB deck that was new in 2015. I decided to lift the metal roof up onto 1.5 inches of strapping and install a modified bitumen membrane on the deck and a radiation barrier on the membrane. I will seal the attic and instead vent above the deck and under the metal. Then I will mount 18 panels on the metal. Most of my panels are leaning against the wall waiting to be installed.
I had occasion to roll my truck down a hill into my house and jar it enough to knock the stack of panels over. One got the corner of the next one pressed into it’s glass and shattered the glass. It still produces 32 volts of power though. Pretty tough stuff.