Started this discussion somewhere else, but have wanted input from here on this for awhile. It's my opinion that higher voltage really is only more efficient for higher wattage.
Quote from Slimthelineman. But I have seen others say the same thing, and claim greater gains.
Quote:
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The idea is to use a lower kv setup on higher voltage. For example a 550 4.5 2s setup in my jammin used 3000-3500mah in a five minute heat. A 550 6.5 3s setup uses around 1500-2000 mah in a five minute heat. Much less current being used and temps are lower. Even further up the spektrum my most efficient RC is my e-buggy. On a 1400kv 6s setup it will use 600-700 mah in a five minute heat on a medium size indoor track.
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I know this example is of different vehicles, just using his #'s as examples. Also there is the probability it's 2-pole to 4-pole motors.
Here's how I see it.
Wattage is wattage, in that example, the 6s setup is making much less wattage then the 2s setup. More then efficiency alone can compensate for, if the motor output was to be equal. The voltage / kv effect on efficiency really shouldn't play into it until the amps the motor is drawing is enough to push it out of it's efficiency range. At the Neu dyno sight, you can see that regardless of voltage, the efficiency is going to run between 85-92%
http://neumotors.com/Site/Dyno_data.html But it doesn't really seem dependant on voltage, more so the motor. 600mah of a 6s would have to be 40% more efficient as a 2s setup using 3000mah for the motor output to be the same.
So, Until your wattage needs, takes your amp needs, out of the usable amp range of the system , I don't really buy the higher voltage is going to be that much more efficient. Using , say, a Neu 1412 and MMP, If I was only pulling 100 amp bursts on 2s, then cut the kv in half, and doubled the voltage, so 50amps on 4s, wattage, speed and performance being equal, I don't believe the setups would have a measurable difference in efficiency.
Am I wrong? How much efficiency can trully be gained from higher voltage? I would think for it to be noticeable you would have to see a 10% increase, and I just don't see how you could get that kind of gain, unless your original setup was just way off. What am I missing?