Input voltage displayed is higher than wall outlet

[Anonymous user]

- I have a BX1500G UPS that is almost one year old. I am using Power Chute version 2.2
The input voltage on the LCD display shows 122-124 volts (fluctuates) and 268-270 watts. This is not normal for my system. I usually show 120 volts input and 277 watts (during normal operations) consistently. Watts of course increase if I play a game, etc. The output voltage from the UPS shows 122-124 volts as well.

Wall outlet measured with a multimeter shows exactly 120.0 volts AC.

Why has this changed? I did have to reinstall Power Chute 2.2 yesterday (after Windows 7 reinstallation). After the reinstall, the display read the usual numbers, if I remember correctly. A self-test right after having installed Power Chute was successfull.

Below is the current status from Power Chute:

Model: Back-UPS BX1500G
Serial number: 3B########
Firmware revision: 866.L1.D
Software version: PowerChute Personal Edition 2.2
Date of last manual self-test: 6/11/2010
Result of last manual self-test: Passed
RAM: 8 GB
Free disk space: 1,687,122 MB

- and -

Electrical power is being supplied by: AC Utility Power
Remaining battery charge is: 100 %
Battery is currently: Charged
Last transfer to battery was caused by: None Recorded
Result of last manual self-test is: Passed on 6/11/2010
Input Voltage: 123 volts

Can you help me with this? Thanks.