I use the default value, according to the selecting sensor and HW Ver. I didn’t make any calibration.
Maybe this is wrong.
An easy way to calculate your Amps per Volt is could be done if your charger shows the charged MAH:
Load your Battery to 100%
Make a logged test flight / drive. The battery should be going down a significant amount (eg 50%).
Reload your Battery to 100%
Calculate:
New BATT_AMP_VOLT = Used BATT_AMP_VOLT * Recharged MAH / Logged MAH
I haven’t made my first flight yet; I’m preparing for it. Maybe I could try changing the parameters, but I’m not very keen on doing that either.
I think yes, these kinds of power modules are probably innacurate at no load. After the first flights you can apply the formula mentioned by @Juergen-Fahlbusch
If this is the first time you are trying a ardupilot based drone than it might be a good idea to follow the Ardupilot Methodic Configurator (AMC) as @amilcarlucas recommended in the second post of this thread.
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The paramater file is a lot more useful than that screen shot.
Here is my parameter list:
parameter_list.param (18.1 KB)
Yes - the basic power modules with a shunt resistor to measure current are famously inaccurate at low currents.
You will only get improved low-current accuracy with a power module that uses a Hall Effect sensor.