Solar Panels for a Chicken Coop: What They Can Run and What They Cannot

The short version

People look for a solar panel for the coop for one of three reasons: an automatic door, a light, or heat for the birds and the water. The first two work. The third does not, and the difference is not the quality of any product. It is the size of the load.

This page sorts the loads. It names manufacturers where their pages document how a device is powered. None of the door openers is in our product comparison, so the page has no pick and no shopping links for them. Everything below comes from manufacturer pages and the sources listed at the end.

What a coop might run, sorted by load

Automatic doors: the load solar was made for

An automatic door moves twice a day. How little energy that takes shows in how the makers power their doors.

Two things follow from the table. First, a door does not need solar at all: batteries carry it for months. A panel saves the battery change, and that is all it has to do. Second, the panels belong to the doors. Each maker describes its own panel or kit, so the sound choice is the one the door's manufacturer names, fitted by its manual.

Lights

A coop light is the second small load. The University of New Hampshire Extension explains that hens slow their egg production when daylight drops below around 14 hours a day, and that some keepers add light to bring the day back up to 14 to 16 hours. It recommends LED bulbs and lamps, because they do not generate the heat of an incandescent or fluorescent bulb, and warns that a lamp that generates too much heat can be a fire hazard.

We found no primary source that sizes a solar panel for a coop light, and we name no wattage. The label of the lamp states what it draws. The NFPA tip sheet adds a rule that applies to any fixture: choose light bulbs that have covers, which protect them from dirt, moisture and breaking.

Omlet sells a coop light that works with its door and switches on five minutes before the door is due to close, according to the product page. That is a light for getting the birds in, not for extending the day.

Heat: why the same panel cannot do it

Solar heat does not add up. The figures used across this site:

• A 150-watt panel that runs through a 14-hour night uses 2.1 kWh.
• A 12 V battery with 100 Ah holds a nominal 1.2 kWh.
• Units sold as solar coop heaters are rated at about 30 watts.

A door runs for months on four AA batteries. A heater needs more in a single night than that reference battery holds. These two loads do not belong in the same plan. The arithmetic, step by step, is on the page about solar chicken coop heaters, and runtime tables for common battery sizes are under battery powered chicken coop heaters.

Before sizing anything for heat, it is worth checking whether the flock needs it. Three extension services advise against supplemental heat for adult birds that are protected from wind and wet, while others expect that many small flocks will want some. Both camps are laid out under do chickens need heat in the winter.

Water: the same problem around the clock

Complete heated waterers draw 60 or 100 watts according to their manufacturers, and they are built for household current. A heated waterer prevents ice; it does not serve warm water, but in a cold spell it may have to work by day as well as by night. What a panel and battery would have to deliver for that is worked out under solar heated chicken waterers.

Without an outlet, the sourced route for water needs no panel: an insulated chicken waterer and a daily swap. Insulation delays freezing and does not prevent it.

What a stand-alone solar system consists of

A panel alone does not run anything after dark. The U.S. Department of Energy puts it this way: for solar panels to produce power on their own, they need two things, a properly configured inverter and a storage system. The inverter generates alternating-current power from the panel's direct-current output. The storage system, like a battery, keeps power steady amid changes in output and load, and lets the system deliver power at night.

For a coop, that splits the options in two:

• A device with its maker's panel. A door opener with a matching solar panel has its storage built in, as rechargeable batteries. Nothing else has to be designed.
• A system you assemble. A panel, a battery, a charge controller and, for anything with a household plug, an inverter. This is electrical work in a dusty, damp building.

How to size a system for small loads

1. List the loads. Door, light, anything else. Leave out heaters and heated waterers.
2. Find watts and hours. The watts are on the label or in the manual; the hours are yours to set.
3. Multiply. Watts × hours ÷ 1,000 gives kilowatt-hours per day for each device.
4. Ask the supplier for the rest. How much a panel yields in December depends on the location and the weather. We did not look up figures by location and give none.

When the coop should get a fixed supply instead

If the list of loads includes a heater or a heated waterer, solar is the wrong tool and a permanent, GFCI-protected supply is the right one. What that involves, and why the NFPA rules out extension cords in the coop, is on the page about electricity to the chicken coop. What helps a coop that stays without power is collected under heating a chicken coop without electricity. The overview of all heater types is on the chicken coop heater start page.