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Decide what must keep running
Make a separate priority list for each season and crop stage. A winter list may put heater fans, heating controls, and other equipment needed to protect crops first. A summer list may prioritize ventilation fans, cooling equipment, well or water pumps, and irrigation. Cornell Cooperative Extension’s Greenhouse Engineering, NRAES-33 describes how outage risks vary with season; conditions at your own site determine which loads are most urgent.
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Inventory the equipment that could matter during an outage, then mark each item as essential, deferrable, or nonessential. Include equipment that supports a critical system—for example, controls or fans associated with heating—not just the main heater or pump. Decide which loads can be switched off or delayed if the backup supply cannot support everything at once. Alberta Agriculture and Irrigation’s greenhouse energy, water, and waste best-management guide distinguishes between backup capacity for all systems and capacity for critical systems; choosing the latter requires a deliberate priority list.
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Do not select a generator from greenhouse area alone or from the sum of running watts without checking startup demand. UF/IFAS Extension’s Auxiliary Power Units For Greenhouse Operations (revised 2021 and reviewed 2024) advises estimating the equipment that must operate simultaneously and accounting for both starting and running power. It notes that motor starting amperage can be two to seven times running current; that is a rule of thumb, not a guaranteed multiplier for every motor.
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Build an equipment schedule
For each critical item, copy the electrical details from its nameplate and manual. Record voltage, phase, horsepower where applicable, running current, and the manufacturer’s starting-power guidance. A useful inventory might include:
- Ventilation fans and other large motors
- Well, water, or irrigation pumps
- Heater fans and controls
- Cooling equipment and its associated motors
- Controls, alarms, and any other equipment essential to the chosen outage plan
Note which items need to run together and which can be shed or delayed. UF/IFAS identifies well pumps and ventilation fans as common large loads. It offers a rough screening rule of about three times the wattage of the largest motor to start it, but directs readers to generator and equipment manufacturers for the actual combination of voltage, motor phase, and loads. Treat that rough rule as a prompt to investigate—not as a final sizing calculation. The publication’s example that a 5-kilowatt generator at 230 volts produces an estimated 21.7 amperes is an illustration, not a recommendation for a greenhouse.
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Choose coverage and runtime deliberately
Decide whether the system is intended to supply all greenhouse equipment or only the critical loads on your list. Compare that need with likely outage duration and practical fuel availability. Have a qualified electrician review the load schedule and proposed standby arrangement; the generator, transfer equipment, and connected loads must be suitable for the actual installation.
Install and operate backup power safely
A generator connection is an electrical installation, not simply an extension-cord decision. Cornell Cooperative Extension’s greenhouse engineering guidance calls for an appropriate transfer switch and attention to installation, while UConn Extension’s greenhouse weather-preparation guidance recommends planning for vulnerable systems and backup power before an event.
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- Have an electrician determine the appropriate transfer arrangement and review utility requirements and local codes.
- Place the generator in a dry, accessible location and route exhaust outdoors, away from greenhouse air intakes and occupied areas.
- Follow the generator manufacturer’s instructions for connection, operation, shutdown, and maintenance.
- Keep operating instructions and emergency contacts accessible to the staff who may need them.
UConn Extension’s farm extreme-weather guidance recommends keeping adequate fuel and operating a generator monthly. Its weather-preparation guidance also supports seasonal checks and routine maintenance. Follow the manufacturer’s schedule and local safe-fuel-storage requirements; the amount of fuel needed depends on the equipment, load, and expected outage.
Prepare for both power loss and heating failure
A generator plan does not replace a heating contingency. Alberta Agriculture and Irrigation recommends having a complete heating-failure plan, including knowing where emergency heating equipment could be rented. Identify in advance who to contact, what equipment would be suitable for your greenhouse, and how it could be obtained if the normal heat source or its power supply fails.
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Install a temperature alarm that can alert someone when conditions move outside the acceptable range for the crop. A battery-powered alarm is one option noted by the University of Georgia Cooperative Extension in its greenhouse heating, cooling, and ventilation guidance. Test the alarm, set appropriate thresholds for your operation, and name the person responsible for receiving and acting on alerts.
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Post a response sequence that matches your wiring, transfer equipment, and generator instructions. The exact order for bringing systems online depends on the installation; have the electrician and equipment providers confirm it rather than relying on a generic sequence.
Quick Recap
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- Confirm the outage and check greenhouse conditions, especially temperature and any immediate heating or ventilation risk.
- Reduce nonessential electrical loads according to the site’s priority list.
- Bring backup power online using the installed transfer equipment and its operating instructions.
- Start large motors sequentially, rather than starting several at once. UF/IFAS advises starting the largest or heaviest motor first; confirm the order for your equipment with the generator manufacturer or electrician.
- Check that critical heating, ventilation, and water systems actually operate. Monitor temperature and verify water delivery rather than assuming a powered display means the system is functioning.
- Contact the utility or relevant service provider, and continue checking crops and facility conditions while the outage lasts and after grid power returns.
Use this preparation checklist
- Inventory vulnerable equipment and identify essential loads separately for cold- and warm-weather conditions.
- Record nameplate and manufacturer information, simultaneous loads, and motor-starting requirements; get the proposed capacity reviewed by an electrician.
- Have a compliant transfer arrangement installed and review generator location and exhaust routing with a qualified professional.
- Maintain adequate fuel for the anticipated event, run the generator monthly as UConn Extension advises, and follow a routine inspection and maintenance schedule.
- Test temperature alarms and confirm who receives alerts and who is responsible for responding.
- Write a heating-failure plan, including contacts for emergency heating equipment rental if winter production continues.
- Keep the written load priorities, operating instructions, and contact list accessible to staff.
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