How to control a Eltek Flatpack2 with WatchMon

Eltek Flatpack2 HE48V-2000W

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 CAN1 port on WatchMon.

  

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

Add the 120 ohm terminating resistor to WatchMon pins 05 & 06.

 

Step 2 - Initial rear view of Eltek Flatpack2 without connector socket

Eltek Flatpack2  rear

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

 Eltek flatpack2 with canbus wire attached

Step 4 - Install AC power plug

Eltek Flatpack install AC plug

Step 5 - Install Anderson DC battery plug

 Eltek Flatpack2 - add battery connector

Step 6 - Install 120 canbus terminating resistor

Eltek Flatpack2 connector attach terminating resistor

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

Eltek FlatPack2 - coating to pcb

Hot glue does not substitute appropriate insulation below this pcb.

Step 8 - Finished assembly

Eltek Flatpack2 Finished assembled

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.

Eltek Flatpack2 Hardware Comm setup screen

 

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.

Remote Setup for Eltek Flatpack2

 

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.

 

Step 18 - Navigate to Control, then Remote to observe inverter info received

Eltek Flatpack2 - remote control setup

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

Products used 

Connector board for Eltek Flatpack2 

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 - TempView

Understanding the WatchMon - Control Logic - VoltView

Understanding the WatchMon - Telemetry - Live Statistics