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How Do I Size a Grain Dryer for My Daily Harvest?

A buyer asked: "I harvest about 50 tonnes of maize a day at peak — what dryer do I actually need?" Here is how our engineers size it.

Short answer: How to size a grain dryer from your peak daily wet-paddy harvest — an AmGrainTech engineer on when a batch dryer beats a continuous tower.

The single most common sizing mistake is dividing annual output by 365 and calling that "daily capacity." Harvest does not arrive evenly — it arrives in a 4–8 week window, often in surges. What matters is the busiest single day.

Step 1 — Find your peak daily intake

Estimate the largest volume you must clear in 24 hours during the peak. Then apply a 1.2–1.5x margin so a wet spell does not overwhelm the machine. If peak intake is 50 t/day, size for roughly 60–75 t/day of drying throughput.

Step 2 — Batch or continuous?

Batch recirculating dryers (3–25 t/batch): low investment, 1–2 operators, flexible across crops. Ideal for farms and cooperatives that dry a few loads a day. One 10 t/batch unit run twice a day already covers ~20 t/day.

Continuous tower dryers (22–500 TPD): grain in and out around the clock with PLC control. Right for collection centers and large growers where stopping means wet grain spoiling on the ground. Our 5HL-120 / 300 / 500 series cover 120–500 TPD.

Worked example

A cooperative with 50 t/day peak: two 10 t batch dryers (rotating) cost less and suit flexible crops, but need manual handling. A single 5HL-120 tower dries it continuously with one operator and no pile-up risk. The tower wins on uptime; the batch pair wins on capital outlay. Tell us your peak day, crop and labour, and we will size the exact configuration rather than guess.

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