I have some minimal experience with them at my work. One of the products my company produces has a solar option.
Basically the solar cell array is roughly 10" x 4" and produces about 9 volts with max sunlight. We have a DC-DC circuit in the solar module that outputs 26 and 6 volts which connect to the load. They work OK, just make sure the battery you use to store the reserve charge is reliable. Our main problem is that the intelligence of the people that install these are minimal and they screw it up all the time.
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