STRCOM Fused String Combiners
Installation and Operation Manual
DOC-020040 rev 4.4
10
Fig. 4 Fused String Combiner Features and Connections
WARNING:
All electrical installations shall be done in accordance with all local
electrical codes and the National Electrical Code (NEC), ANSI/NFPA 70.
WARNING:
Always be certain that all array strings are disconnected before working
on any wiring in the string combiner.
WARNING:
Over-current protection for a battery circuit is to be provided by others.
Battery over-current protection is not provided by this string combiner.
Choosing correct fuse sizes for your combiner: This is done when you are ordering
the combiner. This string combiner is available in configurations from 8 to 30 fuses.
The combiner also includes your choice of 600VDC rated fuses. Fuses sizes can be
8, 10, 12, 15 or 20A. Typically, the fuse size you chose is at least 1.56 x the short
circuit current rating of the PV string (or module used in the string). The fuse value
should not be more than the fuse rating listed on the module nameplate label or
manual.
Example 1: PV module with 3.84A short circuit current rating and a 10A fuse rating.
1.56 x 3.84A = 5.990A
An
8 or 10A
fuse can be selected for this module.
Example 2: PV module with 7.69A short circuit current rating and a 15A fuse rating.
1.56 x 7.69A = 11.996A
Array Fuses
(pos), 4-30
positions
Inverter
connections
(neg.)
NEMA4
Enclosure
Required conduit
exit locations
(see Fig. 2c)
PV Array
connections (neg.)
Ground Bars
PV Array
connections
(pos)
Negative
terminal block
Mounts
Tabs (4)
Inverter
connections (pos)
Door Ground
Bonding wires
