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Inverter buzzing without load

Valin Thulkanam
in Inverters

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Hi , I have a problem with my Vispra inverter, battery is fully charged but it is buzzing when I switch on without load. I also did some welding on the camper but did disconnect the vehicle battery. Was I supposed to disconnect or switch the solar unit off before welding. Could that cause damage to the inverter.√

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