I have a set of solar panels connected to a charge controller which is connected to my camper batteries. The camper has an on board charger which runs off 120 VAC and supplies 12 VDC to the camper and charges the batteries. The first time I connected the "solar system" to the batteries all was fine everything went as expected. However I had a need for 120 VAC and ran a generator for a bit.The next afternoon I noticed that the solar charge controller has emitting a loud buzz, like an alert tone. The LED's on the charge controller appeared to be functioning correctly just the loud tone.
Without the solar panels connected I still got the noise from the charge controller when connected to the batteries.
The charge controller retailer had no information on what the problem could be and gladly replaced the charge controller no charge (pardon the pun).
This brings me to my question: Do I need to put a properly sized diode between the charge controller and the batteries to prevent the on board charger from back feeding into the charge controller?
Without the solar panels connected I still got the noise from the charge controller when connected to the batteries.
The charge controller retailer had no information on what the problem could be and gladly replaced the charge controller no charge (pardon the pun).
This brings me to my question: Do I need to put a properly sized diode between the charge controller and the batteries to prevent the on board charger from back feeding into the charge controller?
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