In order to help customers to realize Multi-MPPT operating as a single MPPT for CX inverter series, one should follow the instructions given as below and understand the differences between independent, parallel and partial parallel mode.

Independent Mode is the default set-up in which the inverter operates, meaning each MPPT has as input full strings.

Parallel Connection is usually used when all PV strings are located and oriented equally, have the same length and provide equal power output in the same period of time, in these cases all strings can share a single MPPT by combining in parallel mode all the MPPTs from the inverter, this will help to minimize the energy consumption from all booster circuits from each MPPT. By using MPPT in parallel mode, when it is applicable, inverter energy consumption can be reduced.

Partial Parallel Mode can be enabled for high current PV modules. In these cases, e.g., three high current strings will be connected to two MPPT.

Therefore, one of the three strings will be connected with Y terminals and the amperage will be equally distributed between the two MPPT. Please refer to the diagram below as an example of how strings in a SG110CX inverter should be connected in partial parallel mode:

1. Update firmware of CX inverter to latest version on iSolarCloud app or website.

2. All MPPT entries must be fully connected.

3. All inputs of CX inverter must be connected from PV strings, located and oriented equally, having the same length and providing equal power output in the same period of time as possible as it could, to ensure parallel input.

4. All DC switches of the inverter must be closed first.

5. The length and diameter of each input cable from the PV strings to the inverter should be the same as possible as it could, so as to ensure the impedance of each input cable is the same, otherwise uneven flow current may be caused during operation.

6. On iSolarCloud Parameter 46-PV-Connection Mode needs to be set to Parallel Connection.

Steps to choose Parallel Connection from iSolarCloud web interface:

1. Update firmware of CX inverter to latest version on iSolarCloud app or website.

2. Connect pairs of MPPT in parallel, with the use of Y terminals. The MPPT should be paired as shown in the table below. (All inputs must be fulfilled, and the last MPPT should be left independent)

3. Please follow the schematic example below to connect the strings with the use of Y terminals, to each MPPT input (each pair of MPPT will share one string between each other):

4. Paired MPPT inputs of CX inverter must be connected from PV strings,

5. located and oriented equally, having the same length and providing equal power output in the same period of time as possible as it could, to ensure parallel input.

6. All DC switches of the inverter must be closed first. Fuse-size, should be about 1.5 times of Isc.

7. The length and diameter of each input cable from the PV strings to the inverter should be the same, so as to ensure the impedance of each input cable is the same, otherwise uneven flow current may be caused during operation.

8. On iSolarCloud Parameter 46-PV-Connection Mode needs to be set to Partial Parallel mode.