2 Product Introduction; Intended Usage - Sungrow SG3KTL-EC User Manual

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.
A
Fig. 2-1 Inverter Application in the PV Power System
Item Description
A PV strings
B Inverter
C Metering device
6
C
B
Remark
Monocrystalline silicon, polycrystalline silicon, and
thin-film of protection class II without grounding.
SG3KTL-EC, SG4KTL-EC, SG5KTL-EC and SG6KTL-EC.
Meter cupboard with power distribution system.
Grid Dispatch Center
D
K
Jumper switch
Household Load
E
F