14 volt tv and the inverter squealing.
My Cambria has a 14 volt/35W TV in the bedroom.(typical power 18W) It is powered by a Samsung ac/dc adapter ( 35w) and that is plugged into a Wagan Elite 400W pro dc to ac pure sine inverter. Now...
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If a battery has only one or two cells that are bad, it will act like wnat you are describing. After charging, it will show full voltage,, but will drop quickly with any load at all, and will output low voltage to a load, because some of the cells are not pulling their part. Especially after having a low water condition. So have a full load test done.
