seaking 130 or 180.....

[angrycat]

so ive been wondering this for a while, why would a higher voltage (130A HV) esc have a lower constant amp and peak amp rating than an esc with a lower input voltage? and why would the lower amp esc cost more? i have been running the seaking 130A HV for a few years in my blackjack and really like its low profile and the fact its water proof but i have always wondered why the 180a esc couldnt handle as much voltage but had a burst of over 1000A, while the more expensive high voltage esc could only handle 130A constant and 180-240 A (depending on model and website apparently)

[kfxguy]

Let me see if I can explain it in a easy uncomplicated way. The numbers I'm going to throw out there are strictly for example and are in no way correct.

Boat A

6s 1800kv motor turning approximately 40k rpm. Say the nominal amps is 160, Then...

Boat B

8s with a 1320kv motor. Again approximately 40k rpm. Because the motor is lower kv, it "should" pull say 130-140 amps (estimation). So my point is, "usually" the same exact motor with a lower kv on a higher voltage will pull less amps and be easier on things and in one instance for myself actually was faster.

I had a 26" cat that I ran 6s on a 1800kv 1512 and 4s on 2650kv 1512 and the 6s setup was faster. I've learned much more since then and I probably could match the speed now by using more battery capacity. But in general lower voltage is much harder on things.


Also learned (contrary to what I initially believed) that if I ran 3s on something and then ran 4s with no changes, the amps pulled on 4s actually went down....oddly because I thought if I turned the same prop faster with more voltage then the amps would go up...well that doesn't appear to be the case with my 32" cat. But I'm pretty sure that could change in a different boat and different setup.

[TRUCKPULL]

Let me see if I can explain it in a easy uncomplicated way. The numbers I'm going to throw out there are strictly for example and are in no way correct.

Boat A

6s 1800kv motor turning approximately 40k rpm. Say the nominal amps is 160, Then...

Boat B

8s with a 1320kv motor. Again approximately 40k rpm. Because the motor is lower kv, it "should" pull say 130-140 amps

Neil

Lets take Travis's examples ( except boat B will be 12S to max out your HV ESC)
boat -A 180A ESC - 6S or lets say 24 Volts at 160 Amps = 3840 Watts

boat - B 130A HV ESC 12S or lets say 48 Volts at 120 Amps = 5760 Watts

Watts is POWER so your 130A HV ESC can handle a lot more POWER then the 180A ESC.

Larry