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Connecting the DC Wiring
975-0253-01-01
3–3
Equipment Needed
•
Conduit for wire runs and appropriate fittings/bushings (outdoor rated if the
inverter is installed outdoors)
•
Wire cutters/wire crimpers/wire strippers
•
Digital voltmeter
•
Frequency counter (optional, for troubleshooting)
•
Female and male DC cable connectors to mate with the Multi-Contact
connectors PV-ADSP3/GWD (positive) and PV-ADBP3/GWD (negative) on
the GT Inverter. You will need two connectors (one female and one male) for
each PV string.
DC Fuses (GT5.0-SP Model Only for Three PV Strings)
The GT5.0-SP has three sets of PV input connectors, allowing three PV strings to
be connected to the inverter. The GT5.0-SP has an internal fused combiner that
must be set up properly if three strings will be connected. The inverter's DC
interconnect board has three fuse clips for DC fuses to provide additional
overcurrent protection. DC fuses must be installed when connecting a third PV
string to the unit. The fuses must be approved (to applicable local or national
standards) 10 × 38 mm fuses rated for 600 Vdc or over, with an ambient
temperature rating of 40 °C. You can also use higher rated fuses, derated for your
installation’s ambient temperature at full power, but with this approach larger
gauge PV wiring must be used in accordance with applicable codes.
The maximum total input current is 24 A. The maximum current allowed per
string (that is, for any single PV input) for the GT5.0-SP model is 15 A, whether a
fuse is used or not. When calculating fuse size, do not exceed the rated maximum
input current or the maximum current per string, and obey all applicable wiring
codes regarding coordination of the fuse size with the PV wire size used. Using
the same fuse value in each string is recommended.
CAUTION: Equipment damage
Improper wiring may cause permanent damage to the GT Inverter. Take special care to
ensure the positive (+) and negative (–) wires from a single array connect to the same
inverter.
Table 3-1
Recommended Fuses
Manufacturer
Model
SIBA
5019906.4, 5019906.6, 5019906.8, 5019906.10, 5019906.12
Littelfuse
KLKD 001., KLKD 01.5, KLKD 002., KLKD 02.5, KLKD 003.,
KLKD 03.5, KLKD 004., KLKD 005., KLKD 006., KLKD 007.,
KLKD 008., KLKD 009., KLKD 010., KLKD 012., KLKD 015.
Ferraz Shawmut DCT5-2, DCT8-2, DCT10-2, DCT12-2, DCT15-2
Bussmann
FWC-6A10F, FWC-8A10F, FWC-10A10F, FWC-12A10F
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Summary of Contents for GT 2.5-DE, GT 3.8-DE, GT 2.8-S
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