6 Electrical Connection User Manual
36
Item Parameter
PV cell type YL250P-29b
Power 250W
Open-circuit voltage (STC) 37.6V
Short-circuit current (STC) 8.92A
Open-circuit voltage temperature coefficient (β)
-0.32%/°C
No. of PV cells in a PV string 22
Under the STC condition, where ambient temperature is 25°C, the open-circuit
voltage of PV cells is 37.6V×22=827.2V<1000V.
Supposed that the lowest temperature is -25°C, the open-circuit voltage of PV cells is
22×37.6V×[1+β×(min. ambient temperature- STC temperature)] =
22×37.6V×[1+(-0.32%/°C) ×(-25°C-25°C)]=952.4V<1000V (meet the operation
requirement).
Therefore, PV string should be designed to meet the open-circuit voltage
requirement even under the lowest ambient temperature condition.
6.3.2 PV Connection Procedures
DC cables from PV strings should be equipped with DC connectors.
Sungrow provides corresponding plug connectors in the scope of delivery for quick
connection of PV inputs. Pairs of MC4 DC connectors are supplied in the scope of
delivery.
To maintain IP65 weatherproof function of inverter, only the supplied
DC connectors or the connectors of the same protection class can be
used.
DC Cable Requirements
Tab. 6-1 DC Cable Requirements
Cross-section
Area Range
Outer cable
diameters
Max. Withstand
Voltage
Max. input current
for each PV string
4...6mm
2
12AWG…10AWG
6…9mm 1000V 12A
The input current of each input channel should be less than 12A, otherwise
the fuse may blow out.
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