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› Can a higher amp ESC give you more power?
01-18-2010 01:44 PM  8 years agoPost 1
Richardmid1

rrProfessor

Leeds, England

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If ones ESC is running close to its current limit, will one get more power by installing a higher amp rated ESC? Providing the battery can produce the juice.

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01-18-2010 02:00 PM  8 years agoPost 2
Romak

rrApprentice

Scotland

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I think I read a few years ago that esc's are more efficient when run at close to their limit. A 100amp esc in a model using 50 amps max would not necessarily give you more power but the esc would not be at its most efficient either.

cheers

Rod
14sg....... ;-)

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01-18-2010 08:56 PM  8 years agoPost 3
Richardmid1

rrProfessor

Leeds, England

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Surely the cooler the ESC runs the more efficient it is? If the ESC is getting warm/hot from high current flow then energy is being wasted in heat.

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01-19-2010 12:51 AM  8 years agoPost 4
Ronald Thomas

rrMaster

Gainesville, Fl, USA

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Certain ESCs like to be close to 100% on the throttle curve to be the most efficient. Kontronics are best at around 68%-72%. Now as far as the amp rating goes, you need to have enough ESC so that it is not being run close to its limits amperage wise. If it is getting hot, you may be running too much HS or too low "C" pack, or a bunch of other reasons related to setup.
You will get more efficiency but not more power per se. There will be an increase in power but will it be noticeable.....not really........Ron

Team MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!

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01-21-2010 04:55 PM  8 years agoPost 5
Pistol Pete

rrProfessor

Seffner, FL

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If ones ESC is running close to its current limit, will one get more power by installing a higher amp rated ESC? Providing the battery can produce the juice.
NO.

ESC controls the power...hence the "controller" part in its name. It does not supply it (batteries) nor add to it (power amplifiers).

In a nut shell, a proper set up does not waste energy...the magic bullet.

~~Enjoying the hobby one flight at a time~~

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01-21-2010 08:20 PM  8 years agoPost 6
TomC

rrKey Veteran

Gold Coast, Queensland, Australia

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While a higher amp esc does not actually 'Give' you more power, it does 'Allow' you to potentially produce more power (Watts).

For example, a 60amp esc at 12v would supply ~ 60x12 = 720 watts of peak power. A 80amp esc at 12v would supply ~80x12 = 960 watts, or about 33% more peak power.

Of course to use this extra power you would need to check that your motor/batteries could supply it in the first place. You would also probably have to re-gear your heli and adjust your collective pitch ranges as well.

Personally, I nearly always choose an esc one size up from the one I calculate I need. This gives me a little more peak current cutoff buffer and also gives me the option to put a bit more power into the heli at a later date.

Hope this helps.

Cheers,
TomC

Nqx,Mcpx-BL,300x,450x,500x,550x
Ion-x, 10s ,SS
TT X50E 10s, HC3-Sx

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01-29-2010 03:44 PM  8 years agoPost 7
Pistol Pete

rrProfessor

Seffner, FL

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While a higher amp esc does not actually 'Give' you more power, it does 'Allow' you to potentially produce more power (Watts).
Of course to use this extra power you would need to check that your motor/batteries could supply it in the first place.
Keyword for both quotes above is "manage".

Only the batteries supplies the energy.
Personally, I nearly always choose an esc one size up from the one I calculate I need. This gives me a little more peak current cutoff buffer and also gives me the option to put a bit more power into the heli at a later date.
^+1

G'day mate.

~~Enjoying the hobby one flight at a time~~

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01-29-2010 04:11 PM  8 years agoPost 8
nivlek

rrProfessor

Norfolk England

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A higher current rated esc is likely to have more FETs . The more FETs that you have in parallel , the lower the overall RDS (resistance from drain to source) , so there will be a lower voltage drop across the FETs . However , I doubt that you could really tell the difference .

At the end of the day , it gets dark .

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01-29-2010 06:35 PM  8 years agoPost 9
Justin Stuart (RIP)

rrMaster

Plano, Texas

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I always run ESCs which are rated at least 20A higher than my expected amp draw of the motor. A larger ESC will run cooler.

You want to run an ESC as close to 100% throttle as possible to get max efficiency, not as close to the amp rating as possible. That's just plain incorrect reasoning.

For example, if you have a 10A ESC and a 20A ESC both at 100% throttle curve on a 10A motor, the 20A ESC will run much cooler than the 10A ESC and will have less risk of thermal overload. When an ESC gets really hot, the efficiency goes way down.

Moral of the story, a bigger ESC will give better efficiency because it will stay cooler, but it will also weigh more--so it is a balance.

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

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01-29-2010 06:43 PM  8 years agoPost 10
nivlek

rrProfessor

Norfolk England

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Moral of the story, a bigger ESC will give better efficiency because it will stay cooler,
That is without doubt true , but you mustn't forget that part of the reason that it runs cooler is that there are more FETs to dissipate the heat , so the reduction in running temperature isn't totally because it's more efficient , only partially .
Personally , I like to choose an ESC that has at least 33% headroom over the maximum current that I expect to draw .

At the end of the day , it gets dark .

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03-21-2010 08:42 PM  8 years agoPost 11
thierry

rrApprentice

Paris FRANCE

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efficiency of ESC increase when higer amp esc is used

but timing is a key factor to get best efficiency of E motor

obviously good Lipo pack is a must

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03-24-2010 06:03 PM  8 years agoPost 12
Wingman77

rrProfessor

Pulaski Tennessee

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I don't think most people actually understand how brushless systems work so I will try to clear things up.

first off you size your esc to handle the power your heli will be pulling, changing esc's will not change the power your heli pulls, you can replace your cc35 with a cc110hv in your T-rex 450 and it would not be any more powerful than before. our brushless motors run three phase electricity which phase locks the motors, the higher the KV the faster the motor will spin with a given voltage. motor KV is an rpm limit, if you are running 100% throttle on a 500kv motor with a 3 cell battery without load the motor will spin at 6300 rpms and the only bogging you will get will be from the voltage drop on the battery. so this setup works very well on electric machines because if you have a high c battery the motor will spin the same speed on the bench as it does flying the heli and a governor is not necessary. the current draw is completely controlled by the motor and not the controller or the battery. so when you are seting up a heli you find a motor that fits the watt and kv specs you need and then find an esc to handle the load.

hope this helps a bit

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03-26-2010 07:21 PM  8 years agoPost 13
thierry

rrApprentice

Paris FRANCE

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a cc110hv has a lower "internal resistance " than a cc 35

so you will see a marginal improvement of the motorization

but timing is probably one of the parameter that people do not consider enough

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