Technical Data - Solectria Renewables PVI 10kW Installation And Operation Manual

PVI 10kW / PVI 13kW / PVI 15kW
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
 Maximum operating voltage of the inverter: 430V DC (will not start up if over 430VDC)
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.
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)
8
6
4
2
0
0
Fig. 10 Example representative PV module voltage versus
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 205V DC
in very hot temperature conditions.
Both the maximum open circuit voltage (OCV) when at cold extreme and minimum MPP voltage when
at hot extreme can be calculated for a PV module using its specification sheet. PV module string sizing
can then be used to determine how many modules can/should be used in a string.
DOCR-060002 rev30
10
Voltage (VDC)
current characteristic at various cell temperatures
30
Installation and Operation Manual
20 30
at 50 deg C
at 20 deg C
at -20 deg C
July 7, 2010