When the power goes, a control shed can turn dangerous in minutes, and an open shed in an hour on a hot day. The answer is a plan, not luck: know what fails first, keep a generator that starts on its own and can carry the real load, test it every week, and train every worker on what to do in the first five minutes. This post walks through all of it for both summer and winter.
What fails first
| What stops | Control shed | Open shed |
|---|---|---|
| Exhaust fans | Air stops, heat and gas build up fast | Less of a problem if curtains are open |
| Cooling pad pumps | Pads dry, no cooling | Not used in most open sheds |
| Water pump | Lines empty in hours, faster in summer | Same |
| Controller and alarm | No warning unless on battery backup | Usually none |
| Lights | Birds pile up in the dark | Birds pile up at night |
| Gas heaters with electric fans or ignition | Heat stops in winter | Same, if used |
In a closed shed, the first problem is air. University of Tennessee extension says that in a fully enclosed, controlled-environment house, a power failure can cause catastrophic losses in less than 15 minutes in hot weather. Heavy birds near sale weight give off a lot of body heat, and with no fans that heat has nowhere to go.
Read ventilation in control and open sheds to see why a control shed depends so fully on fans.
Summer: the most dangerous time
From May to August, with outside temperatures of 40 to 45°C, the generator is not a backup. It is the shed's life support.
In the first five minutes
- Check that the generator has started and the fans are running. If not, start it by hand.
- If the generator fails in a control shed, open every door and side curtain at once, even if the shed was built to stay closed. Some air is better than none.
- Stop feeding during the hottest hours if the shed is struggling; digesting feed makes more body heat.
- Walk the shed. Gently move birds that are piled against walls or in corners.
- Make sure water is still flowing to the far end of every line.
Before summer starts
- Service the generator: oil, filters, battery, coolant, belts.
- Fill the diesel tank and keep a reserve. Refill when it is half empty, not when it is nearly dry.
- Check that the overhead water tank holds at least several hours of hot-weather water, so a power cut does not mean a water cut. Our water quality post gives water use by age.
- Read our heat stress plan and agree with staff who does what on a hot afternoon.
Winter: quieter, but still risky
In December and January fog, power cuts last long and nights are cold. The risks change:
- Fans stop, but gas heaters may keep burning. In a closed shed this builds up carbon dioxide and moisture, and carbon monoxide if heaters burn badly. Keep a small air gap open.
- Heaters with electric ignition or blowers stop, and chicks get cold fast. Keep a manual heat backup for the brooding area.
- Water pumps stop. Fill tanks fully before the usual cut times.
- Lights go out and young chicks pile up. A small battery light helps them stay spread.
Choosing and sizing a generator
There is no one size for every farm. A generator must carry everything that has to work at the same time during a cut.
Add up the load
List every machine that must run:
- Exhaust fans (how many at full summer setting)
- Cooling pad pumps
- Water pump or motor
- Controller, alarm, lights
- Feeder motors, if automatic
Write the running power of each from its nameplate. University of Kentucky extension measured peak demand in US broiler houses of roughly 10 to 15 kW per house; your shed may be smaller or larger, so use your own list.
Allow for starting current
An electric motor draws several times its normal current for a moment when it starts. If all fans start together, a generator that is big enough for running load can still stall. Two fixes:
- Choose a generator with enough margin above running load. A qualified electrician can work it out.
- Start fans in steps, a few seconds apart. Many controllers can do this.
Automatic is worth it
An automatic transfer switch (ATS) starts the generator and switches the shed over within a minute, day or night, without waiting for a worker. For a control shed, this is one of the best investments you can make. Keep a battery or UPS for the controller and alarm so they keep working during the switch.
Test it every week
Mississippi State University extension notes that birds are lost every year to generator failures that were preventable: no fuel, a dead battery, a weak starter or a blocked filter. Their advice:
- Run the generator once a week for 30 to 60 minutes, with the shed load on it, not empty.
- Listen to it start. A slow or rough start is an early warning.
- Check fuel and refill at half tank.
- Replace the battery well before it is old; do not wait for it to die.
- Change oil at least once a year, more often if you run many hours.
- Keep spare fuel filters and the phone number of a mechanic on the wall.
Solar and batteries
More farms in Pakistan are adding solar panels for daytime load and batteries for controllers and lights. Solar can cut diesel cost, but for a summer control shed it rarely replaces a generator: night outages and cloudy monsoon days still need backup. Talk to an installer about your real fan load before you buy.
Count the cost
Diesel for load-shedding is a real batch cost. Record generator hours and diesel bought in your daily log. In Poultry Curve you can note generator hours next to feed and deaths, and put diesel in the expenses, so the batch profit shows the true picture. At the end, check how much power cuts cost you with the profit calculator.