Electric motor vs. Internal combustion

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Fritz Maurer

Well-known Member

• May 1, 2019

• #1

How does a 25HP electric motor compare with a Ford 192-D? The Diesel is really more than my particular application needs, it just drones along at about 1900 RPM. The engine needs to be majored and I would like to use this motor temporarily, if possible. Thanks, Fritz

 

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Case Nutty 1660

Well-known Member

• May 1, 2019

• #1

Been since the 70's since I looked at the conversion chart we had for grain augers, if I am thinking right gas to electric was double so a 25 hp electric took 50 hp gas power to be equal, hyd was even a bigger spread

 

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Steve@Advance

Well-known Member

• May 1, 2019

• #1

Well, looks like your numbers are about right.

A lot depends on the application and the nature of the load.

What are you driving?

If it's a factory built machine, possibly the mfg could give you some numbers.

 

OP

OP

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Fritz Maurer

Well-known Member

• May 1, 2019

• #1

Topsoil shredder. MFR long out of business. Nature of the load? Well, you can't overload it ,if that's what you mean. If the dirt is too wet, it simply slips on the conveyor belt and won't go through the hole leading to the hammermill.

 

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docmirror

Well-known Member

• May 1, 2019

• #1

The delta is in conversion efficiency of the gas engine. There's "HP', and then there is "brake horsepower". The brake HP of an engine is the work product, with all of the internal loads, and lags taken into account.

A 25HP engine will typically produce between 12-16 brake HP. Diesel might be a bit better with no intake vacuum.

For the motor, I would try a 16HP 1750RPM and see how that works. Without knowing more about the engine, it's kinda hard to be precise.

 

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buickanddeere

Well-known Member

• May 1, 2019

• #1

Hp is HP. Doesn t matter if steam, electric , water, gas, diesel , reciprocating , turbine or real horses .
What most people either forget or unaware of is "Torque Rise". And they will argue it endlessly it being power.
An electric motor can momentarily output 2 even three times it rated power for a few seconds . Continuous overloading to that level will burn out the motor .
The other motive sources listed have varying amounts of torque rise when lugged down due to overload .
The other sources have to be oversized to obtain enough torque rise to avoid stalling .
If the conveyor uses an average of 25HP when powered with electric . The conveyor will only load the diesel to an average of 25HP.
The problem is those who are unclear to what power, torque, work, energy, time, distance etc are defined as.

 

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INCase

Well-known Member

• May 1, 2019

• #1

is the tractor HP rated on drawbar or PTO?

 

BarnyardEngineering

Well-known Member

Location

Rochester, NY

• May 1, 2019

• #1

The problem is everybody "understands" HP and nobody will talk about or rate anything any other way.

A 5HP single phase electric motor will effortlessly run a small bale chopper that a fresh 13HP Honda GX390 engine struggles with. Not overloading the motor at all... We run those 5HP motors for hours at 40A on silo unloaders, bedding chopper draws <20A.

 

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John T

Well-known Member

• May 1, 2019

• #1

Its been like 50 years since I studies Thermodynamics and Mechanical Engineering so noooooooo warranty lol. As I best recall, Horsepower is a function of Torque X RPM which is why an old two cylinder Deere might be rated at say 12 HP at 1000 RPM while a lawn mower engine may be rated at say 12 HP BUT AT 3600 RPM. Then there's the whole difference in HP on the drawbar versus HP on the belt pulley due to all the friction heat and HP losses in turning all the gears etc. Then there's the hype about PEAK versus Continuous HP grrrrrrrrrrrrrrrrrr

John T Too long retired n rusty engineer

 

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Russ from MN

Well-known Member

Location

Bemidji MN

• May 1, 2019

• #1

I agree with some of the others 25 electric is equal to about 50 internal combustion. When my fathers friend switched his sawmill to electric that's about what they found out.

 

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GEO-TH, In

Member

• May 1, 2019

• #1

X2. MY dad switch his sawmill to electric. Cheaper to operate and electric motor maintained constant RPMs.

 

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Dean

Well-known Member

• May 1, 2019

• #1

Bingo, B & D.

Dean

 

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buickanddeere

Well-known Member

• May 1, 2019

• #1

The max torque requirement for the load has to be known . Then a prime mover chosen that can exceed the max torque required.

 

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4520BW

Well-known Member

• May 1, 2019

• #1

On irrigation pumps electric takes 1/2 the horsepower of a diesel and a heck of a lot cheaper.

 

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buickanddeere

Well-known Member

• May 1, 2019

• #1

(quoted from post at 14:01:33 05/01/19) On irrigation pumps electric takes 1/2 the horsepower of a diesel and a heck of a lot cheaper.

Click to expand...

Diesel was the wrong size . Diesels operating at half load have lousy fuel efficiency compared to 100% load .

 

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Bill(Wis)

Well-known Member

• May 1, 2019

• #1

Fritz.I went to my Westfield auger manual to compare pto hp requirements with electric motor drive hp requirements. They say an auger that requires 60 pto hp can be run with a 20-25 hp electric motor. I hope that helps and good luck. (;>))

 

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K Effective

Well-known Member

• May 1, 2019

• #1

On irrigation pumps electric takes 1/2 the horsepower of a diesel and a heck of a lot cheaper.

Click to expand...

The cost to pump a gallon of water from the well is, indeed less, as is the need for engine-related maintenance and hauling fuel. The local utility started charging a per-well fee last year, up front, before any water is even moved. They want $1750 per well, plus the metered cost of the power. Supposedly to offset the losses from the Stamp Farms bankruptcy and failures to pay.

Multiple pivots fed by one electric well is now the most efficient.

 

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Texasmark1

Well-known Member

• May 2, 2019

• #1

All things being equal, 3 phase motor.

 

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buickanddeere

Well-known Member

• May 2, 2019

• #1

. All true if electricity is available. It is almost always cheaper than even natural gas in most of North America.
Use a variable frequency drive so it s simple and efficient to control rpm, pressure and flow.
Although some states, provinces and countries have very expensive electric due to subsidizing wind and solar power . Natural gas is sometimes cheaper than peak power.