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SimpBMS Documentation
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Configuring for five Tesla Modules in Parallel/Charge rate throttled Victron #7

Open buddapps opened 1 year ago

buddapps commented 1 year ago

I am using DVCC - Distributed Voltage and Current Control with Victron GXCC and recently updated my firmware and the rate of charge is being limited to about 600 watts total.

I have three SmartSolar MPPT charge controllers and if I turn the power inputs on the other two off. The maximum charge follows the turned on controller.

Everybody who has listed their configuration has the battery capacity set at the default of 100AH.

What values should I put in for five modules in parallel for:

  1. Battery capacity
  2. Maximum pack discharge
  3. Maximum charge current

Thanks

My current notes on how I set it up:

// // Firmware setup //

  1. Connect with Termite
  2. You will be presented with a rolling display
  3. enter a S to enter setup mode
  4. select the battery menu with the "b" command
  5. issue the "f" command to return to factory settings
  6. use the "r" command to reset the AH counter
  7. set the number of cells in series with the command "a 6"
  8. set the number of modules wired in parallel with the command "0 5" for my five modules
  9. set the battery capacity with the command "7 1125"
  10. set the maximum pack discharge with the command "8 500"
  11. return to the main menu with the "q" command
  12. select the Current Sensor Calibration menu with the "c" command
  13. Select state of charge based on voltage with the "2 1" command
  14. return to the main menu with the "q" command
  15. select the contactor menu with the "k" command
  16. Change the PWM for the contactor to always be on with the command "3 255"
  17. return to the main menu with the "q" command
  18. select the charger menu with the "e" command
  19. set the pack maximum charge current with the command "3 240"
  20. Issue the "5" command with until it reads (Victron/SMA) or Relay Control
  21. Issue the "8" command until it reads: Charger HV Connection: Behind Contactors
  22. return to the main menu with the "q" command
  23. return to normal operating mode with the "q" command. Note it is at this step that changes are recorded to storage.
buddapps commented 1 year ago

Re-ran my configuration skipping steps 9, 10 and 20.

Changed step 19 to a value of 200.

Was able to solar charge at 3KW with battery level at 55%.

buddapps commented 1 year ago

Current configuration

Five Tesla modules wired in parallel for a 24V pack. SimpBMS driving two Tesla contactors (+ and -), pre-charge relay with power resister. CAB300 current sensor Victron equipment CXCC and three SmartSolar charge controllers. Ten LG375N2W-G4 panels mostly flat mounted on the top of my forty foot bus/motorhome/caravan for a 3.75KW array. CXCC is configured for DVCC - Distributed Voltage and Current Control Off Brand 6KW inverter (Signiteer).

Todays problem:

  1. Pack started the day at 55%
  2. Solar charging reached 3KW. Not bad for flat mounted on a vehicle and pointed roughly north.
  3. Around 85% still had lots of sun, but charge rate was reduced to 700 watts. (Sort of expected).
  4. Turned on inverter and killed shore power.
  5. Power transfer switch transferred the AC loads to the inverter.
  6. Started drawing about 3KW of DC power from the pack.
  7. Solar power charge rate was climbing and reached about 1500 watts.
  8. An ESS 3 message would appear on the CXCC which means BMS disabled charging
  9. Charge rate went to zero and slowly climbed up to around 1KW until another ESS 3 message appeared.
  10. This process would continue to cycle.

Suggestions?

Thanks