Can someone explain how to use the watt rating for brushless motors

[1945dave]

I know more watts means a more powerful motor. But if the rating is 2750 watts at max efficiency for a 1040KV motor and the maximum battery voltage recommended for this motor is 10S but you run it on 6S what do we really know?

Dave

[martin]

volts x amps = watts.

[m4a1usr]

Dont trust most manufacturers ratings. Unless its a proven company that is well known. Even then do some homework. There are so many outrageous claims from the Chinese manufacturers it only clouds the waters of reason. Max wattage rating being advertised is something only for dreamers or those with large pocket books. Even max eff. should be derated. Let me put it in another way. If Neu or Lehner state 1750 watts continous, you should use 85% of that rating. Why? You dont know your losses. And Neu or Lehners are pretty darn expensive to assume something without building in a sense of margin of error. Its your dollars. Do what you want. But if your smart you wont throw away good dollars on assumptions or false advertising. Just my 2 cents.

John

[m4a1usr]

I know more watts means a more powerful motor. But if the rating is 2750 watts at max efficiency for a 1040KV motor and the maximum battery voltage recommended for this motor is 10S but you run it on 6S what do we really know?

Dave

Sorry I forgot to answer your question directly. Using less volts means you can increase in amperage. But that directly translates into more heat since they are a function of each other. Thats what we know.

John

[1945dave]

John I thank you for trying to help me understand the practical side of this issue. This thread is not far removed from another I posted a few weeks back. Unfortunately I never got the kind of explanation I was hopeing for. I don't have (yet?) the data logging that I need to figure these things out for myself. It just seems logical to me that if you have a powerful motor but don't ask the motor to give you max power it should loaf along easily and not make a lot of heat or tax the esc. I know that is a over simplied thought process but in real time I have two identical KV rated motors and I will find out how swapping these two motors out affects things all things being equal. Then I have ordered a motor that eventually I will run on 8 or 10S but in the meantime I want to set it up as 6S knowing that I have a lot of untapped power to call upon later. I just expect someone on this forum to already have done these things and to let me learn from their experiences.