The panel did not charge my car (Acura MDX). As with most people, the cigarette lighter turns off when the car is turned off. I found a permanently on fuse and connected it to a fuse tap. I have noticed that my battery voltage is constantly dropping. Using barrel shaped 5.5x2.1 connectors I made an adapter to measure current. In decent sunlight it was only 10mA. I used the battery clips that came with the panel and connected them directly to my battery. 600mA or about 7W. Apparently my car has a diode or something that makes it impossible to charge with the circuit always on, it must be a direct battery connection.
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