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Amps motor pulls/battery supply

Amp Motor Battery Lipo amp draw

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#1 BotdesignerXT

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Posted 13 May 2013 - 09:20 AM

I have a somewhat basic battery question.  If a lipo is rated at 1000 mah with 20c/40c, this means the bat can supply up to 40 amps, right?  I know KWA recommends less that 20 amps, but will the motor try to pull this kind of amperage?  

This leads me to another related question.  Does the lipo always supply a minimum of 20 amps, regardless of amp draw?  If it can supply less amperage, then the battery should last longer on a charge, right?

Thanks!

#2 Chuck S

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Posted 14 May 2013 - 03:08 AM

The motor draws what it needs limited by the wire size and the battery's ability to supply the power.  KWA AEGs are fused at 20 amps from the factory so the draw is lower or the fuze would blow.  The 20c/40c is the safe limit of charge and discharge for this battery.  Think of it as "cold cranking amps" in your Jeep battery.  How fast you can draw power and how fast you can put it back.

The 1000mAh rating is 1000 milliamp (1/1000 amp) hours or 1 amp hour and is the capacity of the battery -- how much "juice" is in the battery.  The battery can supply 1 amp for an hour or 20 amps for 3 minutes, etc.  (in a perfect world).

Folks who have measured the amperage draws on our KWA AEGs note the draw is somewhere between 10 and 20 amps.  Assuming the motor is pulling 20 amps a 1000mAH battery is good for about 3 minutes on continuous work -- not much.  At a nominal cyclic rate of 1000 rounds per minute you're good for 3000 rounds down range.  If it's pulling 10 amps you get 6000.  Probably somewhere in between.

All this ignores stuff like power draw to overcome the motor's inertia vs. constant firing in AUTO.

LiPO batteries used in AEG guns seem to be the step children of model airplane requirements where small and light are important.  Not sure what a small, light model plane pulls for amps but guys seem to have several batteries and fast chargers for them.

-- Chuck

#3 philsaudio

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Posted 15 May 2013 - 04:41 PM

A fuse is a time sensitive device. The curve for your fuse will be something like this.
Posted Image


The current your AEG asks the battery for will be something like this. If you pause the player and move the progress bar you can see much more than you see while it is playing.



Your AEG is a dynamic system.


wage peace

#4 BotdesignerXT

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Posted 28 May 2013 - 06:37 AM

Thanks to both who answered!

The video showing really did a good job demonstrating all that I had been reading.





Also tagged with one or more of these keywords: Amp, Motor, Battery, Lipo, amp draw

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