3.0 OPERATION
19
©2000 Xantrex/Trace Engineering
Figure 15A
Solar Array DC Voltage Test (ST1500 and ST2500)
Start-up Procedure
(continued)
Solar Array DC Voltage Check
(Figure 15A for ST1500 and ST2500, Figure 15B for ST1000
and ST2000 models)
1.
Uncover the solar arrays and expose them to full sunlight. This test can not be done
during dark or stormy weather where the available sunlight may not be intense enough to
produce the required output voltage.
2.
Measure the solar array open circuit DC voltage across the DC positive (+) and negative
(-) terminals. This voltage must be greater than 50 volts DC for 5 minutes minimum to
start the inverter.
NOTE: Some thin film modules (amorphous) may produce an open circuit voltages 100-120 volts.
Crystalline solar modules will produce open circuit voltages at 75-85 volts (four modules wired in
series). An open circuit voltage 50 volts or greater is required for 5 minutes to start the inverter. The
5-minute time delay is required by safety standards.
CONNECT
TO
NEGATIVE (-)
TERMINAL
CONNECT
POSITIVE (+)
TERMINAL
975-U00-002B
> 50 VDC
AC
VOLTS
DC
VOLTS
+
–
Figure 15B
Solar Array DC Voltage Test (ST1000 and ST2000)
CONNECT
TO
NEGATIVE (-)
TERMINAL
CONNECT
POSITIVE (+)
TERMINAL
975-U00-002a
> 50 VDC
AC
VOLTS
DC
VOLTS
+
–
