ESC - AMPS vs Volts

[electric]

Somehow I am certain this question does not have a simple answer. I see there are two Castle ESC's for about the same price. One is the 240amp hydra and the new one is the 120amp Hydra with a 50VOLT max. Which is the better one for lets say a 30" boat and why? Really, are you better off running more volts than more amps to get your power?

[Mich. Maniac]

The actually quite simple answer is yes. Amps = heat which='s burnt esc's and batts. running higher voltage with lower amps usually works better, they can still run high in amperage which I will let someone else explain but its got something to do with voltage drop.

[NorthernBoater]

For a 30" boat the HV 240 is overkill. The basic concept is power which is
Watts = Amps * Volts. If you want to run at 1480 W which is about 2 horsepower you could either run 4s at 100 A or run 8s at 50 A. In both cases you will have the same amount of power but on 8s you will be running less amps which equates to less heat generated. Also keep in mind the Feiago motors are not good for over 60-80 amps.

[NorthernBoater]

The actually quite simple answer is yes. Amps = heat which='s burnt esc's and batts. running higher voltage with lower amps usually works better, they can still run high in amperage which I will let someone else explain but its got something to do with voltage drop.

The other reason to run a high voltage setup is the more current you draw the greater the voltage drop across the battery will be. Look at these graphs as an example. The different colored lines represent different discharge rates.

[Mich. Maniac]

For a 30" boat the HV 240 is overkill. The basic concept is power which is
Watts = Amps * Volts. If you want to run at 1480 W which is about 2 horsepower you could either run 4s at 100 A or run 8s at 50 A. In both cases you will have the same amount of power but on 8s you will be running less amps which equates to less heat generated. Also keep in mind the Feiago motors are not good for over 60-80 amps.

spot on, spot on

[FL-E-Boater]

Graphs? Where?

The other reason to run a high voltage setup is the more current you draw the greater the voltage drop across the battery will be. Look at these graphs as an example. The different colored lines represent different discharge rates.

[electric]

Thanks for the information I have purchased the 120amp/50volt Hydra. I am going to run 9xl Fiego with an Oval Master 27. What do you think would be the top voltage I should run with that? I have some 11.1 volt lipoly cells on hand that I will try first. I did see someone comment on 8s, seems like that might be the max yes?

[electric]

Here are some batteries I am looking at. Not much MAH, but I just want enough to do a few top end runs for speed. (having a straightline speed competition with my brother).

Poly RC PQ-3200XQ-4S Li-Poly Battery In Stock $159.99
14.8V 3200mAh (4 cells) 30C/60C
Rating: 30C (96.0A) continuous, 60C (192.0A) burst
Dimension: 150mm x 47mm x 26mm
Weight: 343 grams
Termination: Wire & PolyQuest/Hyperion tap

[NorthernBoater]

Graphs? Where?

Here is the link, http://www.neumotors.com/20061222/Ba...test_data.html. I forgot to put it.

[DISAR]

I tried 3s and 4s setups in my 36" mono, with different propellers. With the 3s the best speed was with a 48mm prop. and with the 4s best speed was with 45mm. It needs testing! With the 3s max.amps was about 65A and with the 4s 75A. Of course Watts were higher in 4s. I recorded these values with an Eagle Tree system. The higher the voltage you have, the smaller propeller you should use to avoid burning ESC and motor. For a 27" I guess a prop. around 40mm for 4s will be Ok. For 6s, 37mm.

[D. Newland]

9XL and Ovalmaster 26 = 4S Lipos. X440 prop for starters. That will make a very fast (but not too fast) setup to get your feet wet-so to speak.

[Eyekandyboats]

For a 30" boat the HV 240 is overkill. The basic concept is power which is
Watts = Amps * Volts. If you want to run at 1480 W which is about 2 horsepower you could either run 4s at 100 A or run 8s at 50 A. In both cases you will have the same amount of power but on 8s you will be running less amps which equates to less heat generated. Also keep in mind the Feiago motors are not good for over 60-80 amps.

huh ? i use a 240 in a 25 inch mono, a 27 inch rigger ... on 2s
over kill, no not at all.

[Mich. Maniac]

huh ? i use a 240 in a 25 inch mono, a 27 inch rigger ... on 2s
over kill, no not at all.

A HV 240? didnt think they would work under 3S

[Eyekandyboats]

no a regular 240. but we are talking about 4s setups so regardless a HV and a LV will do the same job
but i use a HV in a 4s boat that is 30 inches

[Mich. Maniac]

Wish I was spoiled, I mean rich enough to run that kinda setup