10 of 20 - Installing LG Chem - Wiring and Commissioning



  • At this point, the inverter and LG battery are up on the wall and the wiring box covers havebeen removed. 
  • Now the internal clear plastic cover in the battery needs to be removed as well. 
  • Using a Phillips screwdriver, take out the screw in the bottom right corner and the clear cover should come free.
  • Remove the 3/4" caps from the hole at the bottom of the battery wire box and the hole labeled "BAT" on the bottom of the energy storage inverter 


  • Connect the battery to the inverter with 3/4" conduit (EMT) or liquid-tight flex
  • Run wires in the conduit/flex:
    • 8 AWG is recommended
    • Positive (+) wire should be red or white
    • Negative (-) wire should be black
    • Ground wire should be green
    • Strip just under half an inch of sheath off of the ends of the wires
  • At the inverter:
    • Land the wires in the "BAT" terminals located in the left half of the energy storage inverter wire box
      • Note: the battery fuses should NOT be pushed in at this time
      • Common or Phillips screwdriver will be needed to tighten the terminals
      • Tighten the battery terminals to between 2 and 4 N.m


  • At the battery:
    • Note: Be sure that the circuit breaker is in the OFF position (pushed down with circles showing - NOT lines)
    • Land the wires in the three large spring-clamp terminals on the left using a small common screwdriver:
      • Left terminal: Port 3 is Positive (+)
      • Middle terminal: Port 2 is Negative (-)
      • Right terminal: Port 1 is Ground
    • For communication run an RS485 wire between the inverter and battery and land wires in the following battery communication ports found to the right of the positive and negative terminals:
      • Port 2: ENABLE GND
      • Port 3: ENABLE_H
      • Port 4: RS485_H
      • Port 5: RS485_L
      • Note: it does not matter which colors are used so long as they match on both ends


  • Back at the inverter, land the communication wires as follows:
    • The ENABLE GND wire goes in the "GND" port in the inverter
    • The ENABLE_H wire goes in the "ENABLE" port in the inverter
    • The RS485_H wire goes in "BMS485A" port in the inverter
      • Note: Do not use the RS485 ports - it will not work
    • The RS485_L wire goes in the "BMS485B" port in the inverter



  • Now that the battery is wired up it can be powered on
    • First turn on the auxiliary power switch
      • Note: this switch is only used during shipping and storage of the battery
    • Then turn on the circuit breaker switch by flipping it up (lines should show - NOT circles)
    • All of the LED lights will be lit 
    • If no lights are present, this indicates a fault - turn breakers off and double check wiring


  • The clear battery's plastic cover and wire box cover (metal door) can now be replaced 
    • Slip the door into the left side of the battery with it open to between 2 and 10 degrees
    • The door will stay attached when done correctly
  • Measure the battery voltage at the inverter "BAT" terminals to verify that polarity is correct
  • NOTE: if the battery polarity is reversed, the inverter will be severely damaged and will need to be replaced. Make sure the polarity is correct!
  • The battery fuses within the inverter can now be pushed in
  • There are four LED lights on the front of the battery:
    • ON: This indicator should be on if the battery circuit breaker and auxiliary switches are on
    • Charging: A green battery with a lightning bolt and arrows pointing towards it symbol indicates that the battery is accepting a charge at that moment
    • Discharging: This indicator is a white battery with a lightning bolt and arrows pointing away from it indicates that the battery is discharging power at that moment
    • FAULT: This red indicator light is the word "fault" in all caps and means the battery is in a warning state - see "LG Chem and Solis Troubleshooting Guide"

  • Go to the inverter screen and press the Enter button then the Down button three times and enter again when "Advanced Settings" is selected
  • The password is 0017 - Press Down, then Down, then Up and then Enter buttons
  • Press down until "Battery Control" is selected then press Enter
  • Press Enter again on "Battery Select"
  • Use the Up/Down buttons to scroll until "Lg_HV" is selected and then press Enter
  • OverDischg SOC (State Of Charge) is the point at which the battery will stop discharging power 
    • The default setting is 20% and it is NOT recommended to change this value
    • Press Enter
  • ForceCharge SOC (State Of Charge) is the point at which the battery will be forced to begin charging up
    • The default setting is 10% and is it NOT recommended to change this value
    • Press Enter
  • The Droop Curve Control menu allows parameters to be changed; however, the default parameters ensure that the LG Chem RESU10H battery operates properly so it is NOT recommended that any of these values be changed
  • Press ESC then the message "Save & Send" will appear, press Enter if you wish to save or "Cancel and Exit" if you don't
  • Now press down to highlight "Battery Wakeup" and then press enter - the screen should flash "Done!"
  • The battery is now on and ready to charge/discharge - use the ESC button to return to the main screen
  • To double-check that the battery is connected properly, press the Enter button and then Enter again on "Information"
    • Scroll down to "BMS Info" and press Enter
    • This menu displays all values related to the battery
    • Note: if only zeros are on this screen then there is likely an issue with the communication wires or the battery has not been correctly selected in the "Battery Control" menu
  • In the bottom left corner between the battery and in the dotted line between the battery and inverter it should say "Com OK" but if it does not then double check the communication wires
  • The next section will cover operational modes and how to program the charge/discharge times





M
Michael is the author of this solution article.

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