How to control a Eltek Flatpack2 with WatchMon

CAUTION: Not recommended for new projects, provided for legacy project support

Here are the steps to configure the  Eltek Flatpack2 2000W 48V HE Power Supply/Rectifier to the WatchMon supervisor.

CAUTION:  Example shown is for a demo LiFePO4 cell pack 16S1P, ensure that you adopt suitable values 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 - Initial rear view of Eltek Flatpack2 without connector socket

  Step 3 - Install canbus communication cable with twisted (~10 per 10cm)

Step 4 - Install AC power plug

Step 5 - Install Anderson DC battery plug

Step 6 - Install 120 canbus terminating resistor

Step 7 - On bottom pcb cover the resistor and terminal pins with hot glue

Hot glue does not substitute appropriate insulation below this pcb.

Step 8 - Finished assembly

NB: Rectifier should have additional enclosure added to meet relevant compliance.

Step 9 - Navigate to Hardware and then Integration tab.

Step 10 - Select Canbus protocol to "Eltek FlatPack2 HE2000/48" and Save.

Step 11 - Navigate to Control Logic, then Charging tab.

Step 12 - 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 13 - Navigate to Hardware, then CellMon tab.

Step 14 - Adjust the CellMon bypass voltage to suit the application.

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

Step 15 - Navigate to the Remote tab on the Control Logic screen. 

Step 16 - Adjust the remote charging target to suit the application.

Notes:

• Scaling must be 100 for voltage.
• Scaling must be 100 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.
• Maximum charging rate of rectifier is 42A

Step 17 - 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 18 - 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