Zero369

I'm sure you seen it on YouTube, the TC4 that goes 121.7mph/196kmh while using this setup > Mamba Max 7700 motor setup DesirePower 2S+2S 3700mAh 25C.

My question is this: How can the ESC handle all those volts and what are the amps that are being drawn out? the ESC is rated 100A continuous and only used on 2 cell LiPo (7.2v). How is this guy not frying the ESC?

2S+2S 3700mAh means series thus the voltage is then doubled to 14.8v and mAh staying the same at 3700, yes? Isn't 14.8 volts going way past the "100A continuous and only used on 2 cell LiPo (7.2v)" rating? I'm just not understanding this at all...

Or am I just not understanding the battery setup and if so, could you explain what I am missing please

I am assuming the two batteries are wired in series and not parallel. But if they were in parallel, won't the mAh double to 7400 while the volts stay at 7.4v? I need help understanding this....

I read this -> zbattery.com/Connecting-Batteries-in-Series-or-Parallel, so I think I understand... shoot, I dunno know... HELP!!!!

Ray

Druss

the amps is based on the draw from the motor, the more voltage the motor sees the more amps it will draw. Keep in mind that while it's 100amps continuous, the burst is much higher (although it was never meant to be sustained).

also keep in mind that the guy is sponsored and doesn't care if he blows up an esc or motor, they're free for him so he's going to take risks no one else would

Zero369

So its a 3 phrase equation then, voltage and Watts equal Amps? That makes sense to me about that part then.

So he is drawing out a huge load of amps that the ESC can still handle in burst even though he is going over the volts (7.2) as recommended by CC?

So I could use a 3s on a Mamba with a motor that puts out 400 watts and thus pulling 36 amps and still be okay with out frying the Mamba ESC?

Ray

BigTb17

First, I've heard of people using a 4 cell with that ESC if they disable the built in BEC (they would have to hook up an external one) .

Also, just a little while ago I was testing the amp draw on my TC3 with a 5000KV Novak setup, using a 2s Li-Po. It peaked at only 30 amps. I drove it around for a couple minutes and it never went above 30 amps, even with multiple full throttle starts.

I'm sure his setup is drawing much more than that, but if the ESC is rated at 100 amps continuous, it would probably stand up to a couple speed runs that peaked much above that. If he ran that setup for very long it might have issues. But a couple speed runs (the camera cuts, so he may be allowing time to cool) and it would probably hold up.

BigTb17

Oh, by the way. Watts is equal to voltage multiplied by amperage. So if you know any two of those values, you can figure out the third.

Zero369

So in theory, I could put a 3s 11.v lipo in a Mamba Esc with a Velineon 3500 and still be okay then? The Velineon 3500 is rated at 722 watts on 11.1v thus making 46.94 amps. So with those amps, you are still under the safe "100 amps continuous" rating.

If you use more volts than the Esc it rated for while still staying below the maximum amp rating then you could be safe with all kinds of setups then. But you would have to stay in the safe continuous rating while not going over the maximum peak, is this right? If this is right then yeah; doing speed runs like how he is doing pretty safe then.

Watts is equal to voltage multiplied by amperage... gotcha, thanks!

Watts x Amps = Volts
Volts x Amps = Watts

Is that right?

I if I know the KV of a motor and the Volt I will be using, then how can I figure out the amps or watts?
Example...: 5700kv and 11.1v = watts or amps???? Is that possible?

And KVs are equal to RPMs, yes?

Thank you all for the help by the way.

Ray

BigTb17

You can go over on voltage to a point as long as you stay under the amp rating. However, the actual components on the board will be rated for a maximum voltage. If you exceed that you can damage things even if you never exceed the max amperage. The manufacturers rate their ESCs for a maximum input voltage. There is probably a buffer above that to be safe. However, it's hard to say how large that safety zone is, and any time you exceed the manufacturers recommendations you are taking a chance.

You are correct that Volts x Amps = Watts. However Watts / Amps = Volts. You have to divide watts by amps to find volts (or divide watts by volts to find amps).

BigTb17

Picture the wattage equasion like this:

Watts
___________
Volts X Amps

Now if you take any one thing away from that you are left with the equasion for how to find it. For example, if you take away amps:

Watts
_____ = (you are left with watts divided by volts)
Volts

If you remove volts instead you get:

Watts
_____ =
Amps

And finally, if you remove watts you get this:

Volts x Amps =

I hope this helps.

Zero369

Oh, right one BigTb17! That makes perfect sense to me now. Thank you so much!

Ray