Solar Poultry Lighting Calculator

Enter your poultry house size and latitude — get LED fixtures needed, supplemental lighting hours by month, solar panels, 12V battery size, and egg production improvement.

Poultry house

House floor area?

sqft

Bird count?

birds

Target light hours/day?

hr/day

Latitude (your location)?

°N

Light intensity (lux)?

lux

Grid electricity rate?

$/kWh

Poultry lighting solar system

1 × 200W panels + 81 Ah at 12V

LED fixtures needed8 × 9W LED

Total lighting load72 W

Max supplemental hours (worst month)6.7 hr/day

Avg supplemental hours/day4 hr/day

Battery capacity (12V)81 Ah (484 Wh)

Annual lighting energy105 kWh/yr

Annual grid lighting cost (avoided)$14/yr

Solar system cost$1,523

Payback vs grid-powered lighting111.5 yrs

Egg production improvement (layers)

Estimated eggs/bird/yr with 16-hr lighting280 eggs

Extra eggs per year (all birds)+600 eggs/yr

Extra egg revenue/yr~$15/yr

Supplemental hours by month

Jan

+6.4h

Feb

+5.4h

Mar

+4.0h

Apr

+2.6h

May

+1.6h

Jun

+1.3h

Jul

+1.6h

Aug

+2.6h

Sep

+4.0h

Oct

+5.4h

Nov

+6.4h

Dec

+6.7h

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How to Use This Calculator

Enter house dimensions and bird count

Enter your poultry house floor area and bird count. Floor area determines how many LED fixtures are needed for uniform coverage — the standard is 1 fixture per 50 sqft at 10 lux, scaled up for higher intensities. Bird count is used to estimate the egg production improvement from consistent 16-hour lighting.

Set target light hours and your latitude

Set your target total light hours per day (14-16 for layers, 18-23 for early broilers then 8). Enter your latitude — this determines how many natural daylight hours you get each month, and therefore how many supplemental hours the solar lighting system needs to provide. The month-by-month breakdown shows exactly when supplemental lighting is needed.

Read the results

The calculator outputs LED fixtures needed, total watts, solar panel count (200W panels, standard for 12V farm systems), battery Ah, annual grid cost avoided, and egg production improvement estimate. The month grid shows which months need supplemental lighting and for how long each day.

The Formula

Fixtures = (Floor sqft ÷ 50) × (Lux Target ÷ 10) [rounded up] Total Watts = Fixtures × 9W per LED fixture Natural Daylight = 12 + Amplitude × sin(2π(Month-3)/12) [varies by latitude] Supplemental Hours = max(0, Target Hours − Natural Daylight) Daily Wh (peak month) = Total Watts × Max Supplemental Hours Solar Watts = Daily Wh ÷ PSH ÷ 0.80 Battery Ah (12V) = Total Watts × Lighting Hours ÷ (12V × 0.50 DoD)

The natural daylight model uses a sinusoidal approximation scaled by latitude. At 40°N (Kansas), daylight ranges from about 9.5 hours in December to 14.5 hours in June. At 30°N (Texas), the range is 10.5 to 13.5 hours. The calculator sizes the solar system for the worst-case month (typically December-January for northern latitudes) to ensure 365-day operation.

Example

Green Meadow Farm — 500 sqft house, 50 laying hens in Minnesota (45°N)

Green Meadow Farm has 50 laying hens in a 500 sqft house. They want to maintain 16-hour days year-round for maximum egg production, using a 12V solar system not connected to the grid.

House500 sqft, 50 hens

Target16 hr/day, 20 lux

Latitude45°N (Minnesota)

Grid rate$0.13/kWh

Result

LED fixtures10 × 9W fixtures (90W total)

Max supplemental (Dec)~7.5 hr/day

Solar panels3 × 200W panels

Battery~280 Ah at 12V

Annual grid cost avoided~$75/yr

Solar system cost~$1,700

Extra eggs/yr+600 eggs (+$15/yr revenue)

Three 200W panels and a 280 Ah 12V battery bank provide year-round 16-hour lighting for Green Meadow's 50 hens. The $1,700 solar investment is particularly valuable here because grid extension to a remote poultry house would cost $3,000-5,000. The 10-12% egg production improvement from consistent lighting adds further economic benefit.

FAQ

How many hours of light do laying hens need? ▼

Laying hens need a minimum of 14 hours of light per day to maintain consistent egg production. Sixteen hours is the industry standard for maximum production — adding more than 16 hours produces diminishing returns and can cause eye problems. Hens also need at least 8 hours of uninterrupted darkness for melatonin regulation and rest. Without supplemental lighting in winter (when natural daylight drops below 14 hours), egg production falls by 50-80% in northern climates. A simple timer on your solar lighting system, set to add light in the pre-dawn hours (4am-sunrise), maintains the 16-hour day without disrupting nighttime rest.

What lux level do poultry need? ▼

Lighting requirements by poultry type: Laying hens: 20-30 lux at bird level for peak production; minimum 10 lux. Below 10 lux, hens don't fully recognize "daytime" and egg production suffers. Broilers: 5-10 lux — lower intensity reduces activity and improves feed conversion. Very high light (over 30 lux) can trigger feather pecking and aggression in dense layer houses. Turkey breeders: 30-50 lux. Duck layers: 10-20 lux. One 9W LED fixture covers approximately 50 sqft uniformly at 10 lux; double the fixture count for 20 lux. Warm white LEDs (2700-3000K) are preferred for layers; avoid cool blue-white LEDs which can increase stress behaviors.

How much does solar poultry lighting cost vs grid extension? ▼

For a small flock (200-500 sqft house), a complete 12V solar lighting system costs $800-$2,500 depending on battery size. Grid extension from an existing service panel costs $1,500-$5,000 for a 100-200 foot run, increasing to $8,000-15,000 for longer distances. Solar wins economically for any poultry house more than 150-200 feet from an existing panel, or for any off-grid operation. The break-even distance is typically 100-150 feet when accounting for trenching, conduit, wire, panel space, and permits. For temporary seasonal housing (mobile chicken tractors, seasonal range shelters), solar is almost always the right choice — no trenching, no permits, moves with the house.

How much does proper lighting improve egg production? ▼

Research consistently shows 10-15% more eggs per hen per year when maintaining 16-hour light days versus allowing natural seasonal daylight variation. The effect is largest in northern climates (Zone 5-6) where winter daylight drops to 9-10 hours — hens essentially stop laying or lay sporadically without supplemental light. Beyond total production, consistent lighting also improves egg size consistency and reduces molt-related production gaps. For a flock of 50 hens producing 250 eggs/bird/year naturally, a 12% improvement means 1,500 extra eggs — worth $45-75 at wholesale or $100-150 at farm-stand prices.

What battery type is best for poultry lighting? ▼

For a 12V poultry lighting system, AGM (Absorbed Glass Mat) lead-acid batteries offer the best balance of cost and durability for farm environments. They're sealed (no acid spills), handle temperature extremes better than flooded lead-acid, and cost $120-180 per 100 Ah. Use 50% DoD (don't discharge below 50%) for 300-500 cycles of life. For larger flocks or higher budgets, LiFePO4 lithium at 80% DoD lasts 3-5x longer, but costs 2-3x more upfront. In cold climates (below 20°F), keep batteries in an insulated box inside the house — cold dramatically reduces battery capacity, and a 100 Ah battery at 0°F delivers only 60-70 Ah.

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