Today I finally got far enough into my electrical setup on my cargo trailer camper conversion that I was able to start setting up some of my Victron components with my SOK batteries. But I am unclear on what some of the settings need to be while configuring the components using the VictronConnect app.
I think this thread can become the reference for setting up various Victron devices when connected to SOK batteries. Answer what you can and I'll keep it updated as people provide answers to my (many) questions below.
Feel free to share configuration files exported from VictronConnect.
What I have:
Two SOK 206Ah LiFePO4 batteries in series for a 24V nominal battery bank.
A Victron BMV-712 smart battery monitor
A Victron Smart Battery Protect 100
A Victron MultiPlus Compact 24V/2000W/50A Inverter/Charger (though I will only be using 30A shore power)
A Victron 150/45 Solar Charge Controller
I was given the following information by SOK for a 24V battery setup (just twice the values of 12V): Some of these numbers don't seem correct to me and few of them seem to correspond to values needed in VictronConnect.
VictronConnect questions I have for each device:
BMV712 Battery Monitor:
Smart Battery Protect:
MultiPlus Compact
Smart Solar Charge Controller
Any help with these settings will be greatly appreciated. Again, I will summarize all answers to make it easy for future readers to locate this information.
I think this thread can become the reference for setting up various Victron devices when connected to SOK batteries. Answer what you can and I'll keep it updated as people provide answers to my (many) questions below.
Feel free to share configuration files exported from VictronConnect.
What I have:
Two SOK 206Ah LiFePO4 batteries in series for a 24V nominal battery bank.
A Victron BMV-712 smart battery monitor
A Victron Smart Battery Protect 100
A Victron MultiPlus Compact 24V/2000W/50A Inverter/Charger (though I will only be using 30A shore power)
A Victron 150/45 Solar Charge Controller
I was given the following information by SOK for a 24V battery setup (just twice the values of 12V): Some of these numbers don't seem correct to me and few of them seem to correspond to values needed in VictronConnect.
- Over Voltage Disconnect 29.4 V
- Charging Limit Voltage 29.2 V
- Over Voltage Reconnect 29.2 V
- Equalize Charging Voltage shut off or 28.8 V
- Boost Charging Voltage 29.2 V
- Float Charging Voltage 29.2 V <-- Is this correct? I saw another reference that stated this as 27.2V
- Boost Reconnect 26.6 V
- Low Voltage Reconnect 20 <-- Why is this lower than the "Low Voltage Disconnect"?
- Under Voltage Warning Reconnect Voltage 23 <-- Why is this the same as the "Under Voltage Warning"?
- Under Voltage Warning 23
- Low Voltage Disconnect 22
- Discharging Limit Voltage 21
- Equalize Duration 0
- Boost Duration 12 hours <-- Is this correct? I saw another reference that stated this as 3 hours for 12V
Charge Performance:
- Recommended Charge Current 40A
- Maximum Charge Current 50A
- Recommended Charge Voltage 14.6V <-- Is this the absorption or float charge voltage?
- BMS Charge Cut-Off Voltage <14.6V
- Reconnect Voltage >14.4V
- Balancing Voltage <14.4V
Dischage Performance:
- Maximum Continuous Discharge Current 100A
- Peak Discharge Current 200A (3s)
- BMS Discharge Cut-Off Current 330A +/- 10A
- Recommended Low Voltage Disconnect 11.2V
- BMS Discharge Cut-Off Voltage >10.4V
- Reconnect Voltage >11.6V
VictronConnect questions I have for each device:
BMV712 Battery Monitor:
Battery settings
- What should the "Charged voltage" be set to? It defaults to 26.4 for a 24V system.
- What should the "Discharge floor" be set to? It defaults to 5%.
- What should the "Tail current" be set to? It defaults to 4.00%.
- What should the "Peukert exponent" be set to? Victron suggest 1.05 for Li-Ion.
- What should the "Charge efficiency factor" be set to? Victron suggest 99% for Li-Ion.
Alarm settings - I have the shunt/monitor setup to monitor mid-voltage
- What should the "Mid-voltage alarm" be set to? It defaults to 2% deviation and clears on 1.5% deviation.
Smart Battery Protect:
Under Voltage settings
- What should the "Shut down" and "Restart" voltages be set to? I think the "Shut down" value should be SOK's "Recommended Low Voltage Disconnect" of 22.4V. Correct? Then is the "Reconnect Voltage" value of 23.2V correct for the "Restart"?
MultiPlus Compact
Inverter settings
- What should the "DC input low-shutdown" be set to? Would this be the same as the battery protect "Shut down" voltage?
- What should the "DC input low restart" be set to? Would this be the same as the battery protect "Restart" voltage?
- What should the "DC input low pre-alarm" be set to? Should this be SOK's "Under Voltage Warning" value of 23V?
- Should the "Low SOC shut-down" setting be enabled? If so, what are good values for the Shut-down and Restart percentages?
Charger settings
- What should the "Charge current" be set to? SOK's recommend current of 40A? The max current of 50A? Somewhere in between?
- What should the "Absorption voltage" be set to?
- What should the "Float voltage" be set to?
- What should the "Repeated absorption interval" be set to? Defaults to 7 days.
- What should the "Repeated absorption time" be set to? Defaults to 1 hour.
- What should the "Absorption time" be set to? Defaults to 8 hours.
- What should the "Charge curve" be set to? Fixed? Adaptive? Or Adaptive+BatterySafe?
- Should the "Stop after excessive bulk" option be enabled?
AC Input control settings
- Should conditional AC input connection be enabled? If so, what additional settings are best for SOK batteries?
Smart Solar Charge Controller
Battery settings
- Should the Absorption and Float voltages be set to the same values as those used under the Charger settings of the MultiPlus?
- What should the "Low temperature cut-off" be set to? Defaults to 41ºF.
- What should the "Operation mode" be set to? Defaults to "Battery Life".
Any help with these settings will be greatly appreciated. Again, I will summarize all answers to make it easy for future readers to locate this information.