Casella CEL Nomad portable weather station - Manual (Page 63)

9. POWER SUPPLIES
9.1 Solar Power
The Sensus Logger incorporates a solar power regulator as standard. This can
operate with nominal 12 V solar panels with outputs up to 30 W. with a short
circuit current of no more than 2 A.
The BP Solar Panel suppled with the Nomad system has an output of 5
W. It should be wired to the “solar” connector identified in Figure 27.
The pin assignments for the solar panel connector are as follows.
Pin
Assignment
1 Solar panel negative terminal,
2 Solar panel positive terminal.
9.2 Battery
The Sensus Logger incorporates a 12 V lead-acid battery charger as standard.
This charger is designed to operate in conjunction with a nominal 12 V lead-acid
battery and supplies a maximum charge current of 0.5 A.
The battery should be wired to the “batt” connector identified in Figure
28.
The pin assignments for the 12 V lead-acid battery connector are as
follows.
Pin Assignment
1 Battery negative terminal,
2 Battery positive terminal.
9.3 Direct Landline Connection
Power for the Nomad unit can be supplied via a land-line interface (Part number
142009C) which is suitable for distances up to 500 m. The connection is made
via a single cable (Part number W4/1602/4) that carries both 24 V DC power for
the Nomad and communication signals. (Please consult Casella CEL for further
details or when greater distances are required.)
Power Supplies
AN1 AN3 AN5 AN7 AN9 AN11 CNT1 CNT3 ALARMS
0V 0V 0V 0V 0V 0V 0V 0V 0V
-A1 -A3 -A5 -A7 -A9
-A1
1
C1 C3
AL1
+A1 +A3 +A5 +A7 +A9
+A11
+V +V
AL2
I1 I3 I5
+Vs
w
+Vs
w
+Vs
w
+Vs
w
+Vs
w
+Vs
w
CHARGER BATT
0V 0V
+CHG +CHG
+CHG +CHG
0V 0V
AN2 AN4 AN6 AN8 AN10 AN12 CNT2 CNT4 AN.OUT
0V 0V 0V 0V 0V 0V 0V 0V VSS
-A2 -A4 -A6 -A8 -A1
0
-A1
2
C2 C4 A1
+A2 +A4 +A6 +A8 +A10 +A12 +V +V A2 I2 I4 I6
+Vs
w
+Vs
w
+Vs
w
+Vs
w
+Vs
w
+Vs
w
RS232 SOLAR
0V -SP
TXD +SP -B
RXD CTS
DTR
-A
RS485
01072
Solar Panel connector
Battery connector
Figure 27: Solar panel and battery connection (in the Sensus logger)
Page 63 of 68
NOMAD Portable Weather Station
Users Handbook