Generator for a Layer Farm: Continuous Load, Long Cycles, Different Design
Layer farms run 72-week cycles with lighting, egg belts and ventilation all night, every night. Their generator specification is fundamentally different from a broiler farm's.
A layer farm is a continuously operating industrial facility, not a batch operation. Lighting programs run 16 hours a day, egg belts and elevators run several times per shift, manure belts run daily, and ventilation runs 24/7. The generator that fits a broiler farm is often the wrong specification for a layer farm at the same bird count.
Load Characteristics
Layer farms have lower peak kW per 1,000 birds than broiler farms but higher average kW because the load runs for much longer. Plan 1.2–1.6 kVA per 1,000 hens installed, with 25% margin. A 250,000-hen enriched-colony farm typically lands at 350–420 kVA prime.
The largest single motor start is usually a manure-belt drive or a central egg elevator, not a tunnel fan. Check the ratings; they can be surprisingly high on centralized designs.
Duty Cycle
In weak-grid regions, layer-farm gensets often accumulate 1,500–3,000 runtime hours per year — well into prime-rated territory. Standby-rated gensets fail early under this duty. Specify prime rating and plan on major overhaul every 15,000–20,000 hours.
Fuel Planning
Because layer-farm gensets run more hours per year, fuel budgeting is a real line item. A 400 kVA prime genset at 70% load consumes 62 L/h; at 2,000 h/year that is 124,000 L. At USD 1.00/L that is USD 124,000/year — enough to justify a solar-hybrid or battery-buffered study before committing to a pure-diesel design.
Lighting and Egg Quality
Layer flocks are sensitive to light disruption. Specify: LED lighting on a separate essential-load bus that transfers within the ATS window; a dimming controller that ramps up smoothly after transfer rather than snapping to full brightness; and a 30-second minimum genset-run rule after utility restoration to avoid oscillation.
Manure Handling Loads
Belt-manure systems can run for 30–60 minutes at a time. If a utility outage hits mid-cycle, the genset must carry the belt through the full run rather than shed it. Include belt drives in the critical-load list.
Redundancy Options
For farms above ~500 kW, an N+1 pair of parallel-connected gensets provides two benefits: routine service without a full outage, and load-following efficiency (one unit runs at 70% load rather than a single unit at 35%).
Next Step
Combine the HatchMatch generator sizing calculator with the layer-farm feed and water calculators to build a full utility profile, then run a backup power RFQ against that profile with vetted suppliers.