33
4. Wiring Connection
The size of the cable for each inverter is shown as below:
WARNING:
Be sure the length of all battery cables is the same. Otherwise, there will be voltage difference
between inverter and battery which might cause mal-function of the parallel inverters.
Recommended battery cable and terminal size for each inverter:
Model
Wire Size
Torque value
SP5000 Power-M
2*4AWG
5~ 6 Nm
Recommended cable size of AC input and output for each inverter:
Model
AWG no.
Torque
SP5000 Power-M
10 AWG
1.4~1.6Nm
You need to connect the cables of each inverter together. Take the battery cables for example: You need to use
a connector or bus-bar as a joint to connect the battery cables together, and then connect it to the battery
terminal. The size of the cable used from joint to battery should be X times cable size in the tables above. “X”
indicates the number of inverters connected in parallel.
Regarding AC input and output, please also follow the same principle.
WARNING!
Please make sure all output N wires of each inverter must be connected always. Otherwise, it will
cause inverter fault in error code # 72.
CAUTION!!
Please install the breaker at the battery and AC input side. This will ensure the inverter can be
securely disconnected during maintenance and fully protected from over current of battery or AC input. The
recommended mounted location of the breakers is shown in the parallel diagrams in section 5-1 and 5-2.
Recommended specification of battery breaker for each inverter:
Model
1 unit*
SP5000 Power-M
125A/80VDC
*If you want to use only one breaker at the battery side for the whole system, the rating of the breaker should
be X times current of 1 unit. “X” indicates the number of inverters connected in parallel.
Recommended specification of AC input breaker in single phase:
Model
2 units
3 units
SP5000 Power-M
80A/230VAC
120A/230VAC
Note 1:
You also can use only one 40A breaker for each inverter at its AC input.
Note 2:
Regarding three-phase system, you can use 3-pole breaker directly and the rating of the breaker
should be compatible with the phase current limitation from the phase with maximum units.
Recommended battery capacity
Inverter parallel numbers
2
3
Battery Capacity
400AH
600AH
WARNING!
Be sure that all inverters will share the same battery bank. Otherwise, the inverters will be
transferred to fault mode.
