Campbell Com100 Instruction Manual - page 11
COM100 Cellular Phone Package
5
Users must also figure datalogger, modem, and sensor contribution into their
power budgets. For example a standard weather station has minimal current
drain but requires an additional 0.25 Ahr/day battery capacity.
Campbell Scientific offers several sealed rechargeable battery options for use
with the COM100 Cellular System. The batteries offered in our product line
are well suited for remote environments where trickle charging by a solar panel
is common. The rechargeable batteries also provide the current required by the
cellular transceiver that cannot be provided directly by the charging source.
Given the previous application, the following Campbell Scientific power
supplies will allow the cellular system to operate for approximately the number
of days listed below. The amount of time assumes there is no charging source
due to AC power failure or a damaged solar panel. Calculations also assume
the batteries are fully charged and at 25
°
C.
Model PS12LA
BP12
BP24
Charging Source/
Notes
1
1,2
1,2,3
Battery
7 Ahr
12 Ahr
24 Ahr
Approximate
Operating days
<7
<12
<24
1. 10 watt solar panel recommended as charging source in
remote applications, model MSX10
2. 12VDC regulator, model CH12R
3. Larger enclosure required, model ENC 16/18
For frequent (fixed site) calling applications without AC power, the MSX20R
Solar Panel or MSX20 and CH12R Regulator is recommended with a user-
supplied deep cycle marine or RV battery. If the transceiver is seldom on and
the site receives adequate sunlight, a smaller battery and solar panel may work
(see power calculations).
Other factors in determining the battery size for on-line cellular data collection
is the amount of data being stored, the frequency at which the station is being
called for data collection and the baud rate of the data modem. Listed below
are the typical data storage capacities for our most popular dataloggers and the
amount of time required to collect a full datalogger assuming a reliable cellular
phone connection. It is recommended to collect the data at intervals more
frequent than the time required to fill the datalogger’s memory.
NOTES: