NMS044 Reference Manual
Understanding NMS044 Power Consumption
7
Figure 1-7
Formula for Average Watt-hours Used Per Day
To estimate the system run time in days, based on the available battery power, calculate
the following:
Figure 1-8
Formula for Days of Available Battery Power in Watt-hours
Understanding the Modem Low Power Feature
Modem Low Power is an 831C system property that can be enabled or disabled to
facilitate your use. When enabled, the gateway is powered down except for these
periods:
•
when the 831C SLM powers it on to send alert notifications
•
when the SLM sends a file to the cloud (SFTP, Dropbox, etc.)
•
During the scheduled awake period (via 831C-SCH optional firmware add-on)
An NMS044 system purchased later than July 1, 2020 comes ready to use modem low
power, with the power cable (CBL222LP) and SLM firmware (version 4.5 or later). To
prepare an NMS system purchased prior to July 1, 2020 for low power, see
NMS044 for Modem Low Power” on page A-8
.
When modem low power mode is used in conjunction with the 831C Scheduling option
(add-on 831C-SCH), additional power savings and regulation are possible. This option
allows you to schedule measurements as well as periods when the modem uses low
power. For more information on the 831C Scheduling option, open G4 LD Utility, and
navigate to
Help
Manuals
G4 LD Utility Manual
Module 6.3
.
P
24hr
= 24 (1.3 W + t (2.05 Watts))
24
t = time, in hours, that the modem is powered on
Battery (Wh)
(P
24hr
x 2)
Estimated
Run Time (days) =
Battery Capacity (Wh):
BAT020: 35 Ah SLA Battery = 420 Wh
BAT019: 45 Ah LiFPo Battery = 540 Wh
“2” = 50% safety factor to account for battery temperature
effects and aging
