MMM / 2200KV on 2S?

Got some 2S packs here, what would happen if i tried a single 2S pack with my MMM/2200kv motor?

Would it likely damage it at all?

[brushlessboy16]

nothing would happen- it would be slow. wont damage it.

[Rusteh101]

You would be turning half the RPM that you would on your 4s Hyperion batt, so it would be slow and also draw quite a few more amps unless you lower the gearing ratio.

[BrianG]

Originally Posted by Rusteh101

You would be turning half the RPM that you would on your 4s Hyperion batt, so it would be slow and also draw quite a few more amps unless you lower the gearing ratio.

Actually, if he doesn't change the gearing at all, current will be reduced by about half. Halving the voltage on the same resistance (mechanical and electrical load) will halve the current. But yes, it will be much slower. However, if he gears up to compensate for the lower speed, then yes, the current will go up a lot.

Thanks Guys, won't change anything and might give it a go just to see what it's like....my main concern was from overheating as in my tiny mind then it seemed like there might be high current due to the lower voltage which could lead to heat.....guess i was wrong...again!!! :)

[BrianG]

It's a common thing to think. But, if you think about the logic, it makes sense. Simply reducing voltage will reduce current as well. The load, or resistance, does not change. If you gear up to compensate for lost speed, you are effectively lowering the resistance, which will pull higher current.

Look at it this way: if you are pulling 18A average current on 4s, the effective "resistance" is 0.82 ohms. Reducing the voltage to 2s without changing the gearing (keeping resistance the same) would generate 9A of current. The work (power) the motor is doing goes way down.

However, if you gear up the 2s setup to get the same speed as you had on 4s, you are drawing the same amount of power. So, 266w (14.8v * 18A) at 2s would generate around 36A.