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Limit function user manual for US split phase AC grid.

First connecting method for SUN-2000G2(Suggested)

The inverter should be connected to compensate 240V loads. Because the inverter will produce same value feed

current at L1 and L2, and 240V loads also consume same value current at L1 and L2, so with the limit function of

the inverter, the inverter will just produce power that is same as or less than 240V loads’ power, there will be no

extra countercurrent feeding to the AC grid.

So if the 240V loads were connected at separate lines and not mixed with 120V loads, you can connect the

inverter and limit sensor as picture1.

Picture 1 Connecting method for Compensating 240V loads’ power at individual live lines

Second connecting method for SUN-2000G2(Suggested)

If 240V loads and 120V loads were connected at same live lines, but 240V loads were connected after 120V

loads, the best connecting method is connecting the inverter just before 240V loads and after 120V loads, and

the limit sensor should clamp one live line at the position after the 120V loads and before the inverter.

See picture 2.

Picture 2 Connecting method for Compensating 240V loads

Because the inverter will produce same value feed current at L1 and L2, and 240V loads also consume same value

current at L1 and L2, so with the limit function of the inverter, the inverter will just produce power that is same as

or less than 240V loads’ power, there will be no extra countercurrent feeding to the AC grid.

Summary of content (4 pages)

PAGE 1
Limit function user manual for US split phase AC grid. First connecting method for SUN-2000G2(Suggested) The inverter should be connected to compensate 240V loads. Because the inverter will produce same value feed current at L1 and L2, and 240V loads also consume same value current at L1 and L2, so with the limit function of the inverter, the inverter will just produce power that is same as or less than 240V loads’ power, there will be no extra countercurrent feeding to the AC grid.
PAGE 2
Third connecting method for SUN-2000G2(Can be used, but not suggested) If 120V loads and 240V loads were mixed, and the 240V loads were connected before 120V loads, the inverter and limit sensor can be installed as picture 3.
PAGE 3
Important information: After Having connected the inveter and limit sensor as one method listed above, If you want to use limit function, you also need to do below configuration on LCD display, You should select “Limit Mode” and “Internal Limiter” as picture 5. Picture 5: Limit mode configuration If the display shows as picture 6, this means the limit sensor is not connected well or there are no loads powered on, you can check the limit sensor and switch on some loads.
PAGE 4
If so, you need to clamp the limit sensor to opposite direction as picture 8. Picture 8: Correcting the orientation If you did every thing correctly, the LCD display should show as picture 9. The inverter just produces almost same power as the loads’ power, so the AC grid just consumes very small power if the inverter can produce enough power to compensate the loads’ power. (Remark: Numbers on the LCD display will be different for different inverter and different using environment.