Lipo C rating Battery question

[norbyx]

Ok I know batteries and I know lipo. So here is the thing I have been quesitoning about.
I am about to receive a Savage Flux HP that uses a Castle 2200 Motor (or how HPI calls it a Flux Tork).
Now I know that the truck can draw a lot of amps so HPI recomends at least a battery with 25C. Unfortunately they don't specify the Mah of the battery so just saying 25C doesn't give me much.

Correct me if I am wrong but the C rating of a lipo is the capacity to deliver a constant amount of amperes but this depends on the Mah rating of the battery.

For example a 1000 Mah Lipo with 20C can deliver 20 Amps
A 2000 Mah 20C 40 Amps
A 5000 Mah 20C 100 Amps

Is this correct? If so I have no idea on what HPI means by at least 25C since it all depends on the Mah of the battery.

Now here is ONE of my dilemas. I have a 10.000 Mah 15C that means 150Amps that would be good for the Flux or not?

Second question, we all know that if a motor draws let's say 100Amps at 7.4V (2S) that means it has 740 Watts.

Now for the same 740 Watts using 11.1V (3S) It would draw 66.6 Amps Correct?

So at 22.2 (6S) it would draw only 33.3Amps So if I use a 6S setup (with 2 series 3S batteries) I wouldn't need much current (amps).

So at the end of this long story I would like to know if someone can tell me for certain what is the MAX AMP draw that the Flux motor can have.

 

[TattooKenny]

Give John at Holmes Hobbies a PM, he can answer all of that for you"thumbsup" I get confused about it all of that as well:ror:

 

[SuperRoo]

The motor is capable of producing 1500 watts continuous, the ESC is capable of handling 120 amps continuous.

Running on 4S the motor can draw 101 amps maximum continuous a little bit less on a fully charged 4S pack, on 6S the motor will draw 67 amps.

Hope that helps.

 

[norbyx]

Well than if it can draw a max of 120 amps I should have no problem with my 15C batteries. An considering my 3s are of 4000Mah 20c I shouldnt have any problem eather.

 

[Chris_The_Battery_Man]

I would cautious running a 10AH pack. There isn't really anything out there that is a real 10ah, and is suitable for High current RC use. The reason they want at least 25C, is because if the truck is pulling alot of current, and the pack cant keep up, then it will send a ripple current back through the lines, and kill the ESC. Castle makes that combo, and wont warranty anything that is not considered suitable power. With a truck that large, I honestly wouldn't run anything under a 30C 5000mah.

As far as the watts go, there is no real easy way to measure that without having a constant throttle. With a set KV motor, you're only asking it to do twice the work, and it will take what it needs to get to a given RPM. So in the car world, your amp draw is going to increase, unless you start to gear down when you volt up.

 

[DNAMRC]

I would cautious running a 10AH pack. There isn't really anything out there that is a real 10ah, and is suitable for High current RC use. The reason they want at least 25C, is because if the truck is pulling alot of current, and the pack cant keep up, then it will send a ripple current back through the lines, and kill the ESC. Castle makes that combo, and wont warranty anything that is not considered suitable power. With a truck that large, I honestly wouldn't run anything under a 30C 5000mah.

As far as the watts go, there is no real easy way to measure that without having a constant throttle. With a set KV motor, you're only asking it to do twice the work, and it will take what it needs to get to a given RPM. So in the car world, your amp draw is going to increase, unless you start to gear down when you volt up.

I would pretty much agree with this. If you get a 30C or 40C rated pack, you shouldn't have to worry too much about the current draw unless you're way overgeared.

 

[JohnRobHolmes]

OP- your assumptions are right. I would agree that the 10ah 15c pack is not a good choice. It just wont handle the loads well. A 30c 5ah pack would certainly work well.