[Jhinta]

  when i give lets say +50% thl i have around 4 amps , when ik go full it drops , where my power meter shows around 8+
how can this be?

[TheOtherCliff]

I don't have a current sensor installed right now, but is it set so that the current sensor produces 3.3V or less at full current (over 8 amps)?  The FC can't stand more than 3.3V, so giving it 3.4V might make a strange reading or damage the FC.

When slowly increasing from half to full does it slowly drop or does it climb slowly except at a certain throttle point where it jumps down and then starts to slowly climb again?  This broadly shows either an analog problem or a digital one.

As the pack discharges, does the measured current dropping happen at less throttle or more throttle?  At less throttle might mean that it happens because of the pack voltage, at more throttle for some other reason.

Does the pack voltage drop a lot when going from half to full power?  If you are running 2 cell packs, you might be dropping below some value where it even starts to affect your 5V regulated because the regulator needs say at least 7 volts to produce a good 5 volts.

How many lipo cells and what is the voltage at full throttle.

Does the current sensor get really hot at full power?  If you are at or beyond max current for this sensor it will get hot.

What brand / model of current sensor is it?

[Jhinta]

I don't have a current sensor installed right now, but is it set so that the current sensor produces 3.3V or less at full current (over 8 amps)?  The FC can't stand more than 3.3V, so giving it 3.4V might make a strange reading or damage the FC.

When slowly increasing from half to full does it slowly drop or does it climb slowly except at a certain throttle point where it jumps down and then starts to slowly climb again?  This broadly shows either an analog problem or a digital one.

As the pack discharges, does the measured current dropping happen at less throttle or more throttle?  At less throttle might mean that it happens because of the pack voltage, at more throttle for some other reason.

Does the pack voltage drop a lot when going from half to full power?  If you are running 2 cell packs, you might be dropping below some value where it even starts to affect your 5V regulated because the regulator needs say at least 7 volts to produce a good 5 volts.

How many lipo cells and what is the voltage at full throttle.

Does the current sensor get really hot at full power?  If you are at or beyond max current for this sensor it will get hot.

What brand / model of current sensor is it?

 i have a Attopilot 90a
see vid, any id why its going down after around ~5A/.

[Mateusz]

Bateries have certain max discharge, if you pull more amps than that discharge battery gets hot and will not be able to deliver more current. Maybe that matters. If you use cheap PSU that won't be able to deliver enough amps to power 4 motors at full speed.

[Jhinta]

Bateries have certain max discharge, if you pull more amps than that discharge battery gets hot and will not be able to deliver more current. Maybe that matters. If you use cheap PSU that won't be able to deliver enough amps to power 4 motors at full speed.

 
lets count,
1500mAh 45c
1.5A x 45c , thats 67,5A what it can deliver, O i forgot burst-rate of 75 so thats 112,5 but thats for a 10sec orso

  ya but it still can be defect you say,  its not that you see that it can giv it  -> thats why i have a skyrc rs16 + eFuel 230W.
still think i dont know when my battery is bad? above all on the vid you can see its going 10A with no props on where libre is sayin ~4A

i have a 10000mAh 15c 180a-sensor setup wil see what happens there

[Mateusz]

If it's attopilot 90A, that's exactly the same sensor as I am using.
Did you type in the values form table https://librepilot.atlassian.net/wiki/display/LPDOC/Configure+a+Current-Voltage+sensor for CurrentFactor ?
Normally low current (< 1A) reads are not consistent what my multi-meter shows, as low current is not very accurate, but when I start spinning motors (>1A), it matches with what my multi-meter is showing.

[Jhinta]

If it's attopilot 90A, that's exactly the same sensor as I am using.
Did you type in the values form table https://librepilot.atlassian.net/wiki/display/LPDOC/Configure+a+Current-Voltage+sensor for CurrentFactor ?
Normally low current reads are not consistent what my multi-meter, as low current is not very accurate, but when I start spinning motors, it matchs with what my multi-meter is showing.

thats why i have the power meter so i can calibrate it , but is its going down after 5A i cant
witch numbers are you using

[Mateusz]

I used numbers from table for Attopilot 90A. I don't remember if I tunned them, maybe I did at first build, but later I just copy pasted values from table as they were close enough.
GCS is estimating time-left on battery right ? So it might be averaging few samples to get current, also there is a delay few seconds probably, since it's sending data to your computer over usb, it's processed by computer and rendered in GCS. It won't be instantaneously matching. Long time ago I tested like you do, but in flight I get good readings... Nothing comes to my head what would be the issue in your case. I definitely get > 12A in flight displayed on OSD.

[Jhinta]

think i have a faulty sensor or board , my hexa same type sensor , works flawless

[Jhinta]

I used numbers from table for Attopilot 90A. I don't remember if I tunned them, maybe I did at first build, but later I just copy pasted values from table as they were close enough.
GCS is estimating time-left on battery right ? So it might be averaging few samples to get current, also there is a delay few seconds probably, since it's sending data to your computer over usb, it's processed by computer and rendered in GCS. It won't be instantaneously matching. Long time ago I tested like you do, but in flight I get good readings... Nothing comes to my head what would be the issue in your case. I definitely get > 12A in flight displayed on OSD.

my hexa is way off of those numbers, thats why i want to calibrate it
i now have,
100000mAh 3c 15c
current sens = 81,69
voltsens = 16,14

its around +10% thl perfect smal diviation
so that around perfect , only have to see if there is a change when props or on