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Solar Trickle Charger

698 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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DC supplies will often FLOAT high. You need to put a load on them get a true voltage. I would monitor the voltage as the batteries charge and make sure it does not rise above 14.5 as the batteries take on charge.
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