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4. Measuring the backup time
4. Measuring the backup time
4-1 Measuring method of the backup time
(1) Insert the AC Input Plug of the UPS into a wall outlet (commercial power) and charge the battery for at least
12 hours.
(The power switch may be turned ON, and the status of devices linked to the UPS does not matter.)
●
When adding one MB240XR battery, charge it for more than 24 hours.
●
When adding two MB240XR batteries, charge them for more than 36 hours.
(2) Turn on all devices connected the UPS.
(This includes devices connected to the AC receptacles of connected devices such as your computer.)
Conduct operation so that even if power supply to connected devices stops, there will be no hin-
drance.
(3) Remove the AC Input Plug of the UPS and check the backup time.
* The backup time you measure for the first time after purchase is the “initial value of the backup
time".
Initial value of the backup time:
minutes
seconds
4-2 Estimated backup time
The backup time varies depending on the power consumption of devices connected to the UPS.
After calculating the total power consumption of devices connected to the UPS, refer to the graph of the
backup time to obtain an estimate for the initial value of backup time.
(1) Convert the total power consumption (power
consumption) of devices linked to the UPS to watts.
Check the units of these devices connected to the
UPS.
There are 3 units: VA, A, and W
Example 1)
AC100V, 50/60Hz, 145W
Example 2)
AC100V, 50/60Hz, 1.8A
Example 3)
AC100V, 50/60Hz, 150VA
For the devices with the units of VA and A, convert
VA and A to W.
See the table on the right for the conversion.
●
When the power factor is unknown, use “1”.
Normally, the value for the power factor is
between 0.6 and 1.0.
(2) Add up the values converted in W and obtain the
total power consumption of the devices connected
to the UPS.
(3) Obtain the initial value of the backup time for the total
power consumption of the devices connected to the
UPS from the graph on the right.
Unit
Value
VA
x power factor = W
A
x power factor x 100 = W
180
120
60
5
0
1000
700
2000(W)
BN240XR
+ two MB240XRs
BN240XR
+ one MB240XR
BN240XR
BN100XR
BN150XR
Minutes
Backup time
Power Consumption of Connected Devices
10
Initial value
(Ambient temperature = 20
°
C)
