6
2
Product Introduction
2.1
Intended Usage
The inverters, which are 3-phase string inverters without transformer, are crucial
units between the PV strings and utility grid in the small-scaled PV power system.
Inverter is dedicated to converting the DC power generated by the PV modules into
AC power, which conforms to the parameters of local utility grid, and feeds the
alternating current into the utility grid. The intended usage of the inverter is
illustrated in
Fig. 2-1
.
By setting the upper limit of feed power, the inverter will run with power derating
once the meter detects that the output power is greater than the set value.
Any other or additional usage is not permitted except the intended usage.
Neither the DC positive pole nor the DC negative pole of the PV strings is
permitted to be grounded.
Grid Dispatch Center
Household Load
A
B
C
F
E
K
Jumper switch
D
Fig. 2-1
Inverter Application in the PV Power System
Item
Description
Remark
A PV
strings
Monocrystalline
silicon, polycrystalline silicon, and
thin-film of protection class II without grounding.
B
Inverter
SG3KTL-EC, SG4KTL-EC, SG5KTL-EC and SG6KTL-EC.
C
Metering device
Meter cupboard with power distribution system.
