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Solar Trickle Charger

699 Views 6 Replies 4 Participants Last post by  TimSBLI
I just installed a 25 watt solar panel on my boat to keep the batteries fresh. I also installed a controller to make sure the batteries don't overcharge. The panel output was 21 volts before the controller according to my multimeter, after the controller it is also 21 volts. I would expect the output from the controller to be more like 14.5 volts. When connected to the batteries it drops to 11.8 ( the batteries are discharged) and the controller reads "charging". Is this normal?
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I believe it is--but do you have a link to the units? It might help to read the manufacturers spec sheet---
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