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Installation and startup
Connection procedure for AC:
1.
Use a multimeter to check whether the voltage and frequency of the public grid is within the
range of permissible voltage and frequency.
2.
Fix a manual AC breaker between the public grid and the inverter. Keep it disconnected at all
time during connection procedure. Choose an appropriate breaker according to the AC output
specification of the inverter (rated voltage must be 230VAC or higher, and rated current 25-
32A). For each inverter installed, you must fix a separate AC breaker.
Connection procedure for DC:
1.
Use a multimeter to measure the open circuit voltage of the PV strings: it must be less than the
maximum input voltage of the inverter.
2.
Check the short circuit current of the PV strings on the datasheet of the PV generator: it must
be less than the maximum input current of the inverter.
3.
Fix a manual DC breaker between the PV generator and the inverter. Keep it disconnected at
all time during connection procedure. Choose an appropriate breaker according to the DC
input specification of the inverter (rated voltage must 500VDC or higher, and rated current 25 -
32A).
Attention!
The DC breaker should have a certain capacity of overcurrent and overvoltage.
Object
Description
DC-switch (option): Switch the DC-input on or off.
1
DC input: Plug-in connectors for connecting the PV modules. Their polarity is positive,
2
negative, negative and positive, which is marked at side of the connectors.
Communication connections: Wolong inverters are configured with RS485 interface.
3
AC output: plug-in connector for public grid
4
All manuals and user guides at all-guides.com
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