Xantrex Technology 250 - Manual (Page 29)

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PROBLEM: Measured inverter output voltage is too low.
PROBLEM: Charging light is OFF when AC Charger is connected.
Possible Cause
Use of standard “average” reading
AC voltmeter to read output voltage.
Battery is almost “empty”.
Suggested Remedy
“Modified-sine wave” output of
inverter requires “true RMS” reading
meter, such as Fluke 87 series
multimeter, for accurate measurement.
Check Battery Level Meter and
recharge battery as needed.
Possible Cause
No AC power at wall receptacle.
Suggested Remedy
Ensure power is available at receptacle.