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HomeRC & Power✈️Aircraft🚁HelicopterRadio - Servo - Gyro - Gov - Batt › How to caculate average Amp Draw from receiver battery
11-03-2018 12:18 AM  23 months ago
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Ken Filloon

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Highland, Michigan

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How to caculate average Amp Draw from receiver battery
My trex 600n uses 400mah after 6 minutes of flying 3d.
6 minutes is 1/10th of an hour.
.4x10 = 4 amps
I'm pulling an average of 4 amps on my receiver battery.
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11-03-2018 12:36 AM  23 months ago
Flyin for Jesus

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Troy, IL. 62294

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Your math looks good to me.
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11-03-2018 04:22 PM  23 months ago
Jerry K

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Houston Area

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Keep in mind what you put into a battery does not necessarily equal what is taken out. It would be better to somehow measure and record what is removed during the flight. This is adequate for 'rule of thumb' calculations but is not truly accurate.

We have been told the RC connectors are only good for about 3a constant load. Now this is averaging the amp load over the entire flight. Connector amp loads are calculated over time due to heat generation but to much more than this figure is getting into dangerous territory with single connectors which was not specified.
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11-03-2018 06:15 PM  23 months ago
Ken Filloon

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Highland, Michigan

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Full balanced charge
6 minutes of flying
battery takes 400mah to recharge to full
what's not accurate? I do have multiple lines into receiver and fbl unit.
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11-03-2018 06:55 PM  23 months ago
Jerry K

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What you put in is not equal to what you take out, due to the heat factor.
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11-03-2018 07:09 PM  23 months ago
ticedoff8

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Morgan Hill, CA. USA

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Ken Filloon Full balanced charge
6 minutes of flying
battery takes 400mah to recharge to full
what's not accurate? I do have multiple lines into receiver and fbl unit.
You are 100% accurate
You are pulling an average of 400mAh out of the battery on any given flight.

That accounts for powering the receiver, powering the FBL controller, powering the servos, the internal resistance (IR) of the LiPo cells , loss through the wires, loss through the pins in the connectors - yada, yada, yada.
And, any losses that occur during recharging of the batteries.

The confusion may be when someone takes your accurate statement and starts "breaking it down" into "Well, how much power is used by the servos, or is lost through the connector - blah, blah, blah".

You pulled 400mAh out of the battery and you put 400mAh back in.
That about sums it up.
+ > ÷
Believe 1/2 of what you see and none of what you hear.
Fake News will be the downfall of our Republic!
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11-03-2018 07:58 PM  23 months ago
Ken Filloon

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Thanks! that's what I thought.
Ken
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