No three-phase power but a tractor: the PTO pellet mill. A fixed plant with daily production: the electric one. Models from 230 to 400 mm side by side, required tractor, prices and the cost-per-ton math.

Short answer: if there is no three-phase power on the farm and you have a tractor, a PTO pellet mill (power take-off) is the most direct option: you hitch it to the tractor and start producing with no electrical work. If you produce every day in a fixed location with a stable three-phase supply, an electric pellet mill is more convenient and fits better alongside the mill and mixer. Prices are close: the 230 mm model costs USD 3,853 in the PTO version and USD 4,591 in the electric version. Below, how to decide.

How they differ

Both are flat die pellet mills: rollers push the material through the holes of a die and the pellet comes out underneath. What changes is where the power comes from:

  • PTO: connects through a driveshaft to the tractor's rear power take-off, which runs at 540 rpm, and a gearbox carries that power to the die. The engine is the tractor's.
  • Electric: has its own motor and stays installed in a shed or plant. It needs a control panel and, except for the small models, a three-phase supply.

The models, side by side

Meelko offers both versions in the most common die sizes. Capacities are those stated on each product page and vary with the material and its moisture: animal feed is the easiest to pelletize and wood the most demanding.

230 mm die

260 mm die

300 mm die

The largest models

For small outputs, the electric 120 mm (50 kg/h, 3 kW, USD 2,024) and 150 mm (60 kg/h, 4 kW, USD 2,237) models have no PTO version; the 150 mm can be ordered for 220 V single-phase.

When the PTO makes sense

  • There is no three-phase power, or the line is weak. Bringing three-phase power to a rural property can cost more than the pellet mill. With a PTO, that problem disappears.
  • The tractor has idle hours. Outside planting and harvest, many tractors sit still. Putting them to work pelletizing uses a machine that is already paid for.
  • You produce in seasons. Alfalfa pellets at cutting time, feed before winter: the PTO works when needed and is stored the rest of the year.
  • You need to move around. It is light (the MKFD230P weighs 150 kg) and can go from one field to another, or to a neighbor's as a service.

When the electric model makes sense

  • You produce every day. If the pellet mill runs eight hours a day, the tractor is no longer available for field work and its wear starts to matter.
  • It is a fixed plant. Mill, mixer, pellet mill and cooler in line, with one control panel and screw conveyors: the electric model fits that layout better.
  • Power is cheap. Where a kWh costs less than diesel, the cost per ton goes down.
  • You sell pellets as a business. Even, continuous output is easier to achieve with a constant-speed electric motor.

Working out the energy cost

To compare both options with your own numbers, one division is enough. For the electric model: motor power divided by hourly output. The MKFD260C has 15 kW and produces 550 kg/h, so about 27 kWh per ton at most; multiplied by your kWh price, that gives the energy cost of each ton. For the PTO: the tractor's liters of diesel per hour divided by tons per hour. If your tractor burns 6 liters per hour running the MKFD300P at 600 kg/h, that is 10 liters per ton. With those two figures and your local prices, the decision becomes clear.

Two common mistakes

  • A tractor too small for the pellet mill. Each PTO model has a tractor power range. An MKFD300P on a 50 HP tractor will not reach 600 kg/h: choose the pellet mill for the tractor you have, not the other way round.
  • An electric model without checking the installation. A 15 or 22 kW motor needs three-phase power and a panel with a suitable starter. Confirm it with your electrician before buying.

To choose the size, pellet mills from 120 to 400 mm gives the output and price of each die diameter. If you are just starting, flat die pellet mills for beginners explains what can be pelletized and what to expect from a first machine; and if your raw material is alfalfa, see grinding for alfalfa pellets.

Conclusion

The question is not which one is better, but what power you have available and how many days a year you will pelletize. With a tractor and no three-phase power, or seasonal production, choose the PTO. With a fixed plant and daily production, choose electric. Meelko, an American brand of agro-industrial machinery, offers PTO pellet mills from 230 to 400 mm and electric pellet mills from 120 to 360 mm. Tell us what tractor or installation you have, what you will pelletize and how many kilos per day you need, and we will point you to the right model.