User Manual 5 Electrical Connection
33
Connect the inverter to the grid only after getting an approval from the
local electric power company.
AC circuit breaker
An independent four-pole circuit breaker is equipped at the AC side of each
inverter to ensure safe disconnection from the grid.
Recommended
rated voltage
Recommended rated current
If multiple inverters need to share a circuit breaker, the circuit breaker should be
selected according to the capacity.
Never connect a load between the inverter and the circuit breaker.
Requirements for multi-inverter parallel connection
If multiple inverters are connected in parallel to the grid, ensure that the total
number of parallel inverters does not exceed 30. Otherwise, please contact
SUNGROW for technical scheme.
MV transformer
The MV transformer used together with the inverter should meet the following
requirements:
The transformer may be a distribution transformer, and it must be designed
for the typical cyclical loads of a PV system (load in the day and no load at
night).
The transformer may be of the liquid-immersed type or dry type, and shield
winding is not necessary.
The line-to-line voltage on the LV side of the transformer should endure the
output voltage of inverter. When the transformer is connected to to the IT grid,
to-ground withstanding voltage of the LV winding of the transformer, the AC
cables, and the secondary equipment (including the relay protection device,
detection & measuring device, and other related auxiliary devices) should
not be lower than 1,100V.
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