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 CAN1 port on WatchMon.

  

CAN-H - WatchMon pin 03 & pin 05
CAN-L - WatchMon pin 04 & pin 06

NB: On WatchMon adopt pin 03 & 04 and connect a 120 ohm terminating resistor to pin 05 & 06.

 

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

 

Sunny Island RJ45 pin 4 connects to Can-H WatchMon Pin 03
Sunny Island RJ45 pin 5 connects to Can-L WatchMon Pin 04

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

 

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

 

References

Understanding the WatchMon - Control Logic - Charging settings

Understanding the WatchMon - Control Logic - Remote settings

Understanding the WatchMon - Hardware configuration - Integration settings

Understanding the WatchMon - Hardware configuration - Cellmon settings

Understanding the WatchMon - Control Logic - Overview

Understanding the WatchMon - Telemetry - Live Statistics

Understanding the WatchMon - Node Chart

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