PVI 10KW / PVI 13KW / PVI 15KW Installation and Operation Manual
DOC-020028 rev 028
34
7 Technical Data
Technical Information and specifications – see appendix for complete
PVI 10KW / PVI 13KW / PVI 15KW data sheet
Input (DC) from PV array:
•
Maximum open circuit voltage of PV array: 475V DC
WARNING:
NEC 690-7 must be followed to calculate the maximum number of PV
modules allowed for a maximum inverter open circuit voltage (OCV) of 475V DC in
extreme cold temperatures for the installation location.
•
See PV string sizing charts in Appendix B
The open circuit voltage of PV modules depends on the cell temperature and the solar
irradiation. The highest open circuit voltage occurs when the PV modules are at the
coldest temperature and in bright sun. (See the following figure – Fig. 10)
0
2
4
6
8
0
10
20
30
Voltage (VDC)
DC Cu
rr
e
n
t (
A)
at 50 deg C
at 20 deg C
at -20 deg C
Fig. 10 Example representative PV module voltage versus
current characteristic at various cell temperatures
Because the PV modules also have a reduction in voltage at high cell temperatures, you must make
sure the MPP voltage of the strings will not drop below the minimum inverter DC input voltage of
225V DC in very hot temperature conditions.
