6 Electrical Connection User Manual
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6.2 Connecting Inverter to AC Grid
6.2.1 AC Side Requirements
Only after receiving prior approval from the local grid company as
required, should you connect the inverter to the grid.
Prior to connecting to the utility grid, verify whether the grid voltage and frequency
are within the range of inverter output parameters, referred to “Appendix”.
Otherwise consult local grid company for solution.
AC Side Circuit Breaker
An independent three or four-pole circuit breaker (minimum size value 50A) for
each inverter must be installed at the output side to ensure that the inverter can be
securely disconnected.
It is not allowed for several inverters to use the same circuit breaker.
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.
Requirements of Multiple Inverters in Parallel Grid Connection
If several inverters are operated in parallel connection to grid, different
requirements should be obeyed.
Scenario 1:
Several inverters are operated
in parallel connection to the
three-phase Low Voltage grid.
Requirements:
If the number of the grid-connected inverters exceed 40, please contact Sungrow.
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