How to Control a SolaX Hybrid Inverter/Charger with a WatchMon

CAUTION: PLEASE NOTE THIS METHOD IS FOR THE LOW VOLTAGE MODEL.  WE HAVE HAD FEEDBACK IT DOESN'T WORK ON THE HIGH VOLTAGE MODEL

Here are the steps to configure the SolaX Hybrid Inverter/Charger to the WatchMon Supervisor. 

CAUTION:  The example below has values shown for a demo LiFePO, 4 cell pack, please ensure that you adopt the values suitable to your application and comply with the battery suppliers recommendation.

Please be advised that for a number of reasons some of our customers have switched to different inverters after their purchase.

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

WatchMon1   (Same procedure as the WatchMon4 but the screw-terminal / connector looks different).  Add a 120 ohm terminating resistor on WatchMon pin 5 & 6.

Step 2 - Install communication cable to Solax BMS socket.  Check the version for the correct Pins to use.

(Extract from original Solax Manual)

(Extract from X1 Hybrid Solax Manual)

Typical Cat 5 cables have different colour pin combinations to the Solax manual.

Solax  RJ45 pin 1 (typically Green/White)connects to Can-H WatchMon
Solax  RJ45 pin 2 (typically Green) connects to Can-L WatchMon

Solax X1 Hybrid RJ45 pin 4 (typically Blue)connects to Can-H WatchMon

Solax X1 Hybrid RJ45 pin 5(typically Blue/White) connects to Can-L WatchMon

NB: Using a CAT5 Ethernet Cable, strip back the cable and connect to the pins identified above.

Step 3 - Navigate to Hardware, then Integration tab.

Step 4 - Select Canbus protocol to "SolaxPowerSK" 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 both voltage and 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.