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Voltmaster PTO15/12 - 12 kW Tractor-Driven PTO Generator (540 RPM)

Voltmaster Electric Generators and Accessories
Model: PTO15/12
(Based on expert analysis, manufacturer ratings and customer reviews)
4.7 out of 54.7 out of 54.7 out of 54.7 out of 54.7 out of 5
43 Reviews
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  • Features
  • Specs
  • 8
  • 43
  • Articles
  • Shipping
  • Accessories
Run Watts
Rated Watts
Surge Watts
Starting Watts
Convert Your Tractor Into a Generator
Use your tractor engine to generate electricity
Requires at least 24 PTO HP

Multiple Applications
Generate electricity to power tools on the farm or ranch
Backup your home, barn or buildings during a power outage

3600 RPM Brushless Alternator
Produces clean and safe electricity for sensitive electronics

Smooth Wave™ Voltage Regulation
Provides <6% total harmonic distortion & +/- 6% Voltage Reg

Thermal/Magnet Circuit Breaker
Protects generator and appliances from overload

Standard Voltmeter
Makes it easy to monitor your power usage

Standard 1-3/8” Six Spline w/ Helical Gears
Connect tumbling bar (sold separately) between tractor and PTO

Added Features
PTO safety shield

Product Must be mounted to a trailer or concrete slab.
Product Specs
120/240 Single-Phase
60 Hertz
Auto Voltage Regulation
Surge Watts
15000 Watts
Rated Watts
12000 Watts
Rated Amps
50 @ 240 Volts (Single Phase) Amps
Voltage Meter
Tractors HP
24 HP
540 RPM
Grade Type
NEMA 5-20R - Wall-Type
NEMA L14-30R
NEMA 14-50R
159 Pounds
Product Length
29 Inches
Product Width
10.875 Inches
Product Height
16 Inches
Consumer Warranty
5 Years
Commercial Warranty
5 Years

NEMA 5-20R (Wall-Type)
NEMA L14-30R

NEMA 14-50R
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*Ask Mike about the Voltmaster PTO15/12. Sorry, no repair questions:




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  8 Questions
Q: Mike,

I need height of center of input shaft to bottom of gen base for PTO15/12. You're going to have to pull that tape measure out. Thanks.

by Craig Thompson from Kansas on June 28, 2016

A: Below is a link to the cut sheet we have for this unit with the dimensions you need. For more dimensional specs I recommend contacting Voltmaster direct at (800) 730-3927.

Cut Sheet

by Mike, Product Expert
Q: Does the voltmaster pto15/12 generator have a cast iron gear box?
by Glenn from Virginia on January 11, 2014

A: Per Voltmaster/Wanco the gear box housing is cast aluminum.

by Mike, Product Expert
Q: Would this be a good choice for a John Deere 2320 which the manual states produces 18 HP at the PTO and a total of 24 HP at the engine [crank]?
by Kirby from Ohio on July 23, 2013

A: Thank you for your inquiry....

Unfortunately this generator is too large for your tractor. The proper sizing of a tractor to a PTO generator is 1000 watts for every 2 PTO HP. With your unit having 18 HP at the PTO the largest generator you could go with would be 9kW (9000 watts).

Your tractor does not produce enough power output to the PTO generator for it to produce the proper wattage or the proper Hz/Voltage and if connected to your unit you could damage the PTO generator and the equipment you are connecting it to.

Our smallest unit is a 10kW by IMD and with it being borderline with your tractor output we recommend that you contact IMD to confirm it would work.

IMD - (864) 968-0858

Models - PTO 10-2S & PTO 10-2S AVR

by Mike, Product Expert
Q: I have a old farmall 230 farm tractor will it drive this generator?
by Don Wackerle from Michigan on May 11, 2013

A: PTO generator sizing is based on the HP at the PTO and can be calculated using the following....

1000 watts for every 2 PTO HP.
by Mike, Product Expert
Q: Any problems using this exposed to the weather? Not all the time, just during power outages when it will probably be raining or snowing.
by Will from Kentucky on December 26, 2012

A: Per the owner's manual these units are not to be run in rain or snow.

Owner's Manual

by Mike, Product Expert
Q: I have ordered the 12/15 Kw voltmaster pto generator from your online store, unfortunately the factory has a back order problem with parts so not sure when I will receive the generator, but would like to know what plug types I will need to hook up when I receive it.
Thanks, Joe

by Joe Croisant from Texas on August 11, 2012

A: The unit comes with the following outlets.....

by Mike, Product Expert
Q: Bought a voltmaster pto15/12 generator with a 50 amp plug and a reliance transfer switch. The reliance switch came with a 50 plug with 3 prongs. It says it needs a CS6365 power cord plug type. Do you have cords to connect generator to plug in wall in garage.
by Bryan from Connecticut on April 05, 2012

A: The following cord has the correct connections to connect the generator to the Reliance Switch.

Gen-Tran 50A 25ft Cord

This cord has the following ends.....

by Mike, Product Expert
Q: Some of your generators say tractor horsepower and some say PTO HP which is it? I have a 35hp tractor with a 25hp PTO what is the biggest gen I could have hooked up to it?
by Rob Bridges from Illinois on January 31, 2011

A: The HP rating is based on the PTO HP and when looking at your PTO HP output the estimated generator size is based on the following: 1000 watts for every 2 PTO HP so for your 25HP PTO you can use a maximum 12,500 watt generator.
by Mike, Product Expert
Voltmaster PTO15/12 Reviews & Ratings
Overall Rating
4.7 out of 54.7 out of 54.7 out of 54.7 out of 54.7 out of 5
Easy To Use (11)
I'd Buy It Again (8)
Price (6)
High Quality (4)
Durable (3)
Amp Meter Broken After T... (1)
Packaging (1)
Rain Prof It (1)
I Don't Have Any Dislike... (1)
95% of respondents would recommend this product to a friend
43 Reviews  Sort by 
James G.
Purchased from Electric Generators Direct
Purchased 8/5/14
Total Helpful Votes
13 Helpful Votes
Most Helpful Positive Review
5 out of 55 out of 55 out of 55 out of 55 out of 5
Sweet Unit
I just received my PTO powered generator. The other day. Fast service.I chose to weld up my own 3 point carry all to mount it on. I made room for my Lincoln wire Feed welder on the platform, along with some tools. My tractor is a 1953 Ford Jubilee rated at 30 HP at the PTO.

We live on a ranch and we needed a back up power supply for the house, well, and shop. Now I can have power Any were I need on the ranch. Today I set the tractor engine to 540 PTO RPM , volt meter read 240 Volts and I... more
View Image
Pros: Easy To Use, I'd Buy It Again, High Quality
James Recommends This Voltmaster Product
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Robert G.
Decatur, TX
Purchased from Electric Generators Direct
Purchased 8/11/14
Total Reviews
2 Reviews
5 out of 55 out of 55 out of 55 out of 55 out of 5
Mounted And Tested
Here is the Generator mounted in my home made frame.

I will use an old washing machine housing to cover top and sides with the painted sheet metal for weather protection.

I added a 50 AMP 3 prong socket for my welder. It plugs into the 4 pole socket on the GEN.
View Image
Robert Recommends This Voltmaster Product
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Alfred M.
Walnutport, PA
Purchased from Electric Generators Direct
Purchased 10/25/12
Total Reviews
3 Reviews
5 out of 55 out of 55 out of 55 out of 55 out of 5
Very Good Product
I chose a pto driven generator for its portability. We have a 26 HP diesel tractor and six acres of trees and shrubs. I have used it more for trimming than for house power. It easily provides sufficient power for the items on the emergency power panel. It does take a bit of time to hookup the house when the power goes out, but we have not had a power outage of more than eight hours since I purchased the generator so I can't say how long my six gallons of fuel will last. I made a framework with... more
Pros: Easy To Use, I'd Buy It Again, Price, Exceeded Expectations
Alfred Recommends This Voltmaster Product
Alfred's Experience With Electric Generators Direct
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Michael G.
Alba, TX
Purchased from Electric Generators Direct
Purchased 12/9/16
4 out of 54 out of 54 out of 54 out of 54 out of 5
12kw Generator
Bought the generator to power a welder off tractor. I have a stick welder like you see at home depot, Lincoln 225 amp. The generator will run it but your not going to be able to build fence with it. Will work for repairs or minor jobs. When you strike an arc it pulls the volts down to 180 or so, the tractor has no problem keeping up with it. Also if you want to run 220 tools with it (like the welder) your going to have to build your own cord. They will tell you to buy one at any RV place, I... more
Michael Recommends This Voltmaster Product
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Danny B.
Bankston, AL
Purchased from Electric Generators Direct
Purchased 6/28/16
5 out of 55 out of 55 out of 55 out of 55 out of 5
Just What I Needed
Using volt master has saved my strawberry operation. It powers all my well points for consistent irrigation. Durable and maintains accurate voltage. Great investment, hope to put a couple more on line.
Danny Recommends This Voltmaster Product
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Ogdensburg, NY
Purchased from Electric Generators Direct
Purchased 10/28/12
Total Helpful Votes
46 Helpful Votes
5 out of 55 out of 55 out of 55 out of 55 out of 5
Great Generator
I received Generator on Friday. Went to tractor supply and bought the CountyLine® Carry All, Category 1 Quick Hitch (130 dollars,and PTO drive shaft for 150 dollars. Mounted steel plate to carry all. Mounted generator to plate and was running my whole house with electric dryer,220 well pump,

Furnace and any other thing I could turn on by 7 pm Friday night. No issues at all.
Will note that I recommend you purchase a (kill O watt meter for 20 dollars to plug into one of the 110 volt... more
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David B.
Allentown, PA
Purchased from Electric Generators Direct
Purchased 11/2/12
Total Helpful Votes
35 Helpful Votes
5 out of 55 out of 55 out of 55 out of 55 out of 5
I ordered this generator from EGD after Hurricane Sandy 2012. We had a similar event on the East Coast last year about the same time that left us without power for 5 days. Again in 2012, Sandy was another 5 days without power.

With the gas being the most common fuel for portable generators and the effect Sandy had on the East Coast, NJ and NY ran low on gasoline. I decided on this type of generator as I have a Cub Cadet 7 series Subcompact tractor that could run the PTO driven generator.
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Steve P.
Jarrettsville, MD
Total Helpful Votes
25 Helpful Votes
5 out of 55 out of 55 out of 55 out of 55 out of 5
Good Generator For The Money
I bought this generator after a storm that knocked out power for 3 days. My welder/generator did just fine, but 1.5 gal of gas an hour was a bit much. I bought this pto generator, made a 3 pt hitch frame and bought a driveshaft at Tractor Supply, and tested it out and had no problems. Summer of 2012 we lost power in Maryland for 4 days. This generator ran about 102 hours continuously with no problems powered by a John Deere 1026r sitting beside a 300 gal diesel tank. PERFECT.
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Ron L
Simpsonville, KY
Purchased from Electric Generators Direct
Purchased 7/18/12
Total Helpful Votes
25 Helpful Votes
5 out of 55 out of 55 out of 55 out of 55 out of 5
Voltmaster Generator
Solid generator for the money. Hooked it to a 36 hp mass & ran a house with 3 1/2 ton a/c, fridge, freezer chest, all lights & microwave going.

No problems. Ready for the next power outage.
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Total Helpful Votes
21 Helpful Votes
5 out of 55 out of 55 out of 55 out of 55 out of 5
Great Pto Generator
I fabricated my own frame for this PTO generator when all I had was a 650 JD rated at 14 PTO hp. Although It was only good for producing 5 or 6 Kw with that tractor, it worked flawless. I did use a frequency meter to check against the pto setting on the tach and it is amazing, the tach is close enough. It's always 59 to 61 htz. Now with the 37 hp tractor it will play with this generator.
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Thom G.
Colrain, MA
Total Reviews
2 Reviews
Total Helpful Votes
41 Helpful Votes
2 out of 52 out of 52 out of 52 out of 52 out of 5
Not Yet Satisfied With This Product
I received my new PTO generator just in time for the East Coast storm. I made the concrete base for it according to the drawing furnished with the unit. I purchased a PTO shaft to attach to my more-than-adequate tractor for the generator.

At 540 RPM, the output was only 50 Hz and 77 Volts. Just below red lining the tractor, the output was only 55 Hz and 100 Volts. I will say that the folks who manufacture this unit (Winco) are responsive thus far, but to this point, there has yet to be... more
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We currently CANNOT ship this product to California or any destination outside of the United States
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Lift Gate Services
  • Safely Lowers Products Off the Truck
  • Requires Special Hydraulic Lift
  • Free Lift Gate
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