Differences with different cell count, same rpm

[mekzoid]

Hi all,
This has been bugging me for weeks, No matter all the searching I do I cannot find my answer. Sorry about another thread.

Just for the example, Lets say I am using a TP 4060
I would like to know the differences between:
1450 KV on 6s = 32190 RPM with no slippage
and
1130 kv on 8s = 33448 RPM with no slippage

Mostly all motors have such vast kv selection, I understand that low kv is high torque less speed and vice versa for high kv. But what would the benefit be with a slight kv difference with a higher cell count taking in to account the extra weight for the cells.


If we disregard the slight RPM difference, Which would be the better choice and why?

Thanks alot,
Todd.

[photohoward1]

In theory the higher cell count will be a lower amp draw for the same power level. More efficient. But not all boats will accommodate the higher cell count weight. More cost too.

[martin]

As said lower amp draw with lower kv & higher voltage, the specs on the motors you list are 1450kv max 176a @ 34v, 1350kv max 150a @ 42v.

[mekzoid]

Excellent thank you for that guys. Makes much more sense now :)
Looking at the specs I do now see what you mean aswell. Cheers!

[NativePaul]

Higher cell count does not have to mean heavier, as the lower KV will be pulling less current form the batteries you can use more smaller capacity cells totalling the same weight for the same runtime.

Electrically the benefit goes to the high voltage low KV system as there will be slightly less losses in the wiring so it will be a little more efficient.

Economics will probably play a bigger part, as while high current ESCs are more expensive, there are a LOT of 6s maximum controllers out there and while there are a fair few 8s capable ESCs, most of them are classed as HV ESCs and are much more expensive.