Hi All
I used the initial tune parameters (18inch prop 6s battery) to set the battery failsafe parameter.
However my drone is prematurely executing an battery failsafe RTL at 23v. The battery failsafe is set to the default value as per the initial tune parameters.
Oh so its BATT_LOW_MAH parameter. My interpretation of this parameter was if the capacity used falls below 12800mah it would execute the Battery failsafe. I did not think that this parameter means you should have 12800mah in reserve.
Thanks @dkemxr at point it out, I’ll correct it and test fly!
Ardupilot can estimate how much the voltage of your battery sags based on current and what the voltage would be after the battery had time to relax. BAT_FS_VOLTSRC determines if the raw battery voltage or a sag-compensated voltage gets used to determine if a low voltage failsafe occurred.
When you use the sag compensated voltage you can input the manufacturer’s recommendations into BATT_LOW_VOLT and BATT_CRT_VOLT. For lithium-polymere it’s usually like 4.2V full, <3.6V low, <3.5V critical, <3.3V empty and <3V permanently damaged. All voltages per cell.
When you use the raw voltage you can input slightly lower values without damaging your battery.