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Hypertough 750-watt inverter, display-voltmeter problem

Applied battery-voltage will be 12.8 volts, display-voltmeter on the inverter will show 11.5 volts. But if I apply voltage to the inverter using a DC power-supply, the display-voltmeter will be correct.

Posted by tickyul on

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W.L.

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Most likely the battery volts are displaying correctly. There is a voltage drop on the battery due to its internal resistance, when you connect a supply the voltage drop is less.
If you were to put a new battery on it it might reduce the voltage drop, as long as the battery is designed for the current load it's taking.
If it's working I wouldn't worry, but if the voltage continues to drop with use I'd be thinking it needs a new battery. (Assuming the battery is charging correctly)

Posted on Dec 09, 2022

Testimonial: "Thanks for the input. I checked battery-voltage with my meter, the inverter-display is definitely off....very little V-drop on the high-current lines."

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