How to Control an SMA Sunny Island Inverter/Charger with a WatchMon

Here are the steps to configure the SMA Sunny Island Inverter/Charger to the WatchMon Supervisor.

CAUTION:  Example shown is for a demo LiFePO, 4 cell pack, 16S1P, please ensure that you adopt values suitable to your application and comply with the battery suppliers recommendation.

Step 1 - Install communication cable to Charger via CAN port on WatchMon.

For newer WatchMon (Note: 120 Ohm resistor shares CANbus High and CANbus Low).

For older WatchMon with 4 pin CAN see below

Step 2 - Install communication cable to SMA Inverter wiring socket.

Sunny Island  RJ45 pin 4 connects to Can-H WatchMon
Sunny Island  RJ45 pin 5 connects to Can-L WatchMon

Only the Sunny Island CAN communication interface is connected to the BMS, the second communication line – SYNC Bus is not connected to the BMS. 

Extract from Sunny Island configuration of RJ-45 plug "ComSyncIn" of :
Pin Signal
1 Sync1 – reserved
2 CAN_GND
3 SYNC_H
4 CAN_H
5 CAN_L
6 SYNC_L
7 Sync7 – reserved
8 Sync8 – reserved
 
NB: Using a CAT5 Ethernet Cable strip back the cable and connect to pins identified above.

Step 3 - Navigate to Hardware, then Integration tab.

Step 4 - Select Canbus protocol to "SmaSunnyIslandV31" and Save.

Step 5 - Navigate to Control Logic, then Charging tab.

Step 6 - Adjust the charging control logic to suit the application.

Notes:

• Limited power must be enabled.
• Cell Hi Cutout should be above the CellMon bypass voltage threshold as a safe guard target.
• Low power current should suit the bypass capability of CellMon.
• When the bypass current is above Initial, it will trigger the system to low power.
• When the bypass current for all cellmons is above Final, the system will complete charging cycle.

Step 7 - Navigate to Hardware, then CellMon tab.

Step 8 - Adjust the CellMon bypass voltage to suit the application.

Note: Make sure to "Device Sync" the changes to the CellMons.

Step 9 - Navigate to the Remote tab on the Control Logic screen. 

Step 10 - Adjust the remote charging target to suit the application.

Notes:

• Scaling must be 10 for voltage.
• Scaling must be 10 for current.
• Low power must be enabled on charging tab.
• Low power current should suit the bypass capability of CellMon.
• Charger voltage target needs to be sufficient for all cells to reach bypass threshold.

Step 11 - Adjust the remote discharging targets to suit the application.

Notes:

• Scaling must be 10 for voltage.
• Scaling must be 10 for current.
• Do not run low power mode on discharging tab.
• Control logic discharge voltage cutout should match the remote target.

Step 12 - Navigate to Telemetry, then Live Stats to observe system operation.