6 Electrical Connection
User Manual
30
6.3
Connecting Inverter to AC Grid
6.3.1 AC Side Requirements
Only after receiving prior approval from the local grid company as
required, should you connect the inverter to the grid.
AC Side Circuit Breaker
An independent three or four-pole circuit breaker for each inverter must be installed
at the output side to ensure that the inverter can be securely disconnected.
Inverter Type
Specification Recommended of AC Circuit Breaker
SG10KTL 20A
SG12KTL 25A
SG15KTL 32A
SG20KTL 40A
There are some points that are not allowed for the inverter:
y
It is not allowed for several inverters to use the same circuit breaker.
y
It is not allowed to connect loads between inverter and circuit breaker.
Residual Current Device
With an integrated universal current-sensitive residual current monitoring unit
inside, the inverter is able to distinguish the fault currents from normal capacitive
leakage currents. The inverter will disconnect from mains as soon as a fault current
of more than limit value has been detected.
However if an external RCD or residual current breaker is mandatory, the switch
must trigger at a failure current of 300mA or higher.
Requirements of Multiple Inverters in Parallel Grid Connection
If several inverters are operated in parallel connection to grid, different
requirements should be obeyed (See technical information “
System Impedance and
Stability Recommendation for Multiple String Inverters in Large PV Power Plant
”
in the download area of Sungrow website).
Summary of Contents for SG10KTL
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