Setting of MOT_SAT_CURR_MAX for two batteries

ArduCopter Copter 4.5
1

Regarding the Setting of MOT_SAT_CURR_MAX
If I use two smart batteries, each connected via CAN
The currents of Battery 1 and Battery 2 are 50A respectively
Battery 1 plus Battery 2 equals 100A
How do I need to set MOT_SAT_CURR_MAX
Is it set to 50 or 100A

2

Are they connected in series, or in parallel?

1 Like
3

parallel connection
Battery 1 and Battery 2 have separate currents
The maximum rated current of my battery’s BMS is 90A
When hovering, the Mission Planner displays that Battery 1 and Battery 2 are both around 50A

4

parallel connection
The maximum rated current of my battery’s BMS is 90A

5

Set parameter to 100A

6

thank you
Is the parameter set to Battery 1 plus Battery 2 100A
If my maximum limit for a single battery is 90A
So my parameter should be written as 180A, right?

7

thank you
Is the parameter set to Battery 1 plus Battery 2 100A
If my maximum limit for a single battery is 90A
So my parameter should be written as 180A, right?
The introduction on the wiki is to lower the throttle to 60%
The actual situation is that when I am flying at full speed and the total number of batteries 1 and 2 exceeds 180, the system’s response is to reduce the flight speed or tilt angle? Or simply lower the throttle value. Because the description is not very clear, in my understanding, the correct way should be to reduce the flight speed and lower the current protection battery if the aircraft flies at full speed beyond 180.

8

First check if ArduPilot correctly reports that the current is the sum current of the two batteries. If not you need to configure it until it does.
See: Complete Parameter List — Copter documentation

Then that limit has a delay so settling it to 180A is a bad idea. 120A sounds a lot safer to me. But i did not read the battery specifications so that is just a guess.

9

BAT_SUM-MASK cannot be found anymore

10

That parameter exists in ArduCopter 4.5.7:
https://ardupilot.org/copter/docs/parameters-Copter-stable-V4.5.7.html#batt-sum-mask-battery-sum-mask

11

My battery has a continuous output of 90A, which is safe, and the peak value can be greater than 90A

12

Thank you.
So I just need to set BAT_SUM_maSK to 0, right? Tomorrow I will test the effect. Currently, I am limiting the maximum flight speed of the aircraft to no more than 90A for a single current. If I set the aircraft to 30 meters per second, the maximum speed will exceed 90A. If I set it to 20 meters per second, the headwind will not exceed 90, and the sum of two battery monitors will not exceed 180A