Measure the dimensions of the A/C shroud cover and then search for a solar panel of those dimensions. Usually such a small panel is a battery maintainer, not a true charger. Probably doesn't have a controller, too small to need one.
Can't help on the 'temp/compass' need more details, like make and where it is.
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Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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