PVI 10KW / PVI 13KW / PVI 15KW Installation and Operation Manual
DOC-020028 rev 028
16
WARNING:
Fuses in the inverter’s AC disconnect must only be replaced with
Solectria Renewables Part Number FRS-R-50, or 50A, 600V, Bussmann, FRS-R-50
fuse. (Same for all 240VAC versions or 40A fuse of the same type for all 480V AC
versions and 10kW, 208 & 240VAC versions, Part Number FRS-R-40 and 30A for
all 600VAC versions, FRS-R-30)
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 8, 10, 12 or 15A midget,
Bussmann, KLM-8 (10, 12, 15). Always refer to PV module fuse ratings and
specification before selecting or replacing fuses.
Connection Wiring To Electrical Utility Grid
The PVI 10KW / PVI 13KW / PVI 15KW 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 PVI 13KW-208VAC (or 240VAC) versions. A 60A breaker should be used
for the PVI 15KW-208VAC. (A 40A breaker is recommended for the 10kW, 208-240VAC
versions,40A circuit breaker is recommended for all 480VAC versions and a 30A breaker is
recommended for all 600VAC versions.)
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 0.14
Ω for a 250 feet (76.2 m) 8 AWG conductors
•
Approximately 0.09
Ω for a 250 feet (76.2 m) 6 AWG conductors
•
Approximately 0.05
Ω for a 250 feet (76.2 m) 4 AWG conductors
•
Conductor impedance of < 0.09
Ω is recommended.
The total impedance phase to phase of the grid plus the interconnecting AC conductors should be
less than 0.18
Ω. Lower resistance, heavier wires will allow more energy production from the PV
system and will help prevent inverter trips required by UL1741 if line voltages are high or low.
