PVI13KW Installation and Operation Manual
DOC-020028 rev 006
16
WARNING:
Fuses in the inverter’s AC disconnect must only be replaced with
Solectria Renewables Part Number ELC-110110, or 45A, 600V, Type J, Feraz,
GOAJT40 fuse. (Or 40A fuse of the same type for 480V AC version, Solectria
Renewables Part Number ELC-110102)
WARNING:
If inverter is equipped with the fused PV combiner, fuses in DC
disconnect must only be replaced with 500-600V DC rated fast-acting fuses, such as
Solectria Renewables Part Number ELC-110013-001, or 10A midget, Bussman,
KLM-10. Always refer to PV module fuse ratings and specification before
selecting or replacing fuses.
Connection Wiring To Electrical Utility Grid
The PVI13KW must be connected to the grid with 3 conductors and an AC equipment grounding
conductor. A 50A breaker is recommended for the dedicated PV system circuit breaker for the
208VAC version. (a 30A circuit breaker is recommended for the 480VAC version.)
The grid impedance value at the connection point should be as low as possible to avoid an
increase of the AC-voltage to non-permissible values while the inverter feeds to the grid.
Minimizing wiring impedance also results in higher system efficiency.
EXAMPLE:
The impedance is the sum of the electricity grid impedance at building
distribution and all impedance values of conductors and connections.
Single conductor impedance values are:
•
approximately 0.16 ? for a 250 feet (76.2 m) 8 AWG conductors
•
approximately 0.10 ? for a 250 feet ( 76.2 m) 6 AWG conductors
•
approximately 0.06 ? for a 250 feet (76.2 m) 4 AWG conductors
•
Conductor impedance of < 0.10 ? is recommended
The total impedance phase to phase of the grid plus the interconnecting AC conductors should be
less than 0.2 ? .
