PVI 1800/PVI 2500
Installation and Operation Manual
19
The PV-panel open circuit voltage must be below 400V DC (V
pv
< 400V DC) under all
conditions as per NEC 690-7 using multiplier for cold weather OCV. Please read the
Technical Info section and see PV string sizing table in Appendix C.
WARNING:
Even when in the off position, the DC disconnect will remain live on the PV
side (“line”) when the PV modules are in daylight.
If the connection of the DC (PV) wire provided on the inverter is to be made to a DC disconnect or
junction box, mount the DC disconnect or junction box. (Make sure the disconnect or junction box is
close enough to the inverter so that the inverter’s DC wires will reach the disconnect or junction box via a
conduit and that an adequate length of wire will be available inside the disconnect or junction box to
make connections/termination to positive (+) switched terminals, negative (-) PV wire, and ground bar. It
may be convenient to use a neutral kit for terminating multiple PV negatives.)
The conduit fittings included on the inverter are open, as shipped (although the wires are inside conduit
fittings, they have no conduit in them). Measure and cut the 1/2” metallic or non-metallic flexible
conduit to go between the inverter’s DC conduit fitting and the DC disconnect or junction box. Next,
install a conduit fitting in the DC disconnect or junction box. Thread the inverter’s DC wires through the
conduit and into the DC disconnect or junction box conduit fitting. Fit the conduit into fittings and tighten
fittings. If needed, cut off inverter’s DC wires to the correct length inside the DC disconnect or junction
box. Finally, terminate inverter wires in the DC disconnect or junction box. Red wire is positive (+),
white is negative (-) and green is ground.
3 Commissioning the Inverter and PV System
The inverter is mounted, all connections are made and you are ready to power it up.
NOTE:
Make sure all tools; parts, etc. are removed from the vicinity of the inverter before
turning on.
WARNING:
Make a final check for correctness of all AC and DC wiring to the inverter
and in the system.
NOTE:
With the PV modules connected and inverter disconnects still off, it is a good
precaution to check PV polarity once more simply by carefully using a 600V, DC rated
digital volt meter and probing the positive (+) and negative (-) PV connections in the
disconnect.