How to control a 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 LiFePO4 cell pack 16S1P, 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.
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 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 100 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 both voltage and 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.
Notes:
- Scaling must be 100 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 13 - Navigate to Control, then Remote to observe inverter info received
Notes:
- Charge Target Voltage - voltage cutout sent to inverter when charging
- Charge Target Current - ampere limit sent to inverter when charging
- Charge Actual Flags - reported charging mode and operating state flag received from inverter
- Charge Actual Voltage - charging cutout volatge setpoint sent from inverter
- Charge Actual Current - reported battery amperes from inverter when charging
- Charge Actual Power - reported battery state of charge SoC% received from inverter
- Charge Actual Temperature - reported battery temperature from inverter
- Discharge Target Voltage - voltage cutout sent to inverter when discharging
- Discharge Target Current - ampere limit sent to inverter when discharging
- Discharge Actual Flags - reported active message error flag received from inverter
- Discharge Actual Voltage - reported battery voltage from inverter
- Discharge Actual Current - reported battery amperes from inverter when discharging
- Discharge Actual Power - reported relay state flag received from inverter
- Discharge Actual Temperature - not used
Additional useful screens to monitor:
- Node Chart
- Charging logic control
- Remote logic control
- Live statistics telemetry