Measured inverter output voltage is too low.

Symptom The AC voltmeter reading is 5 to 15 volts too low.

Possible cause

Suggested remedy

A standard “average-reading” AC voltmeter has been used to measure output voltage.

The battery voltage is too low.

For accuracy, the 500 Inverter modified sine wave output needs to be measured with a “true RMS” voltmeter, like a Fluke 87 series multimeter.

Recharge the battery.

Battery operating time is less than expected.

Symptom The inverter runs for a while, and then the light comes on. The inverter is cool or warm to touch.

Possible cause

Suggested remedy

The battery is old or defective.

The battery is not being charged properly.

Replace the battery.

Have a qualified technician check the vehicle’s electrical system.

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