How many solar panels do I need for a 3-bedroom house in Nigeria?

A typical 3-bedroom house in Nigeria with 2 ACs, a fridge, fans, and lights needs approximately 2,400-3,200W of solar panels, which translates to 6-8 panels of 400W each. The exact number depends on your location's sun hours and daily energy consumption.

How do I calculate the number of solar panels I need?

Divide your daily energy consumption (kWh) by your location's peak sun hours and system efficiency (0.75). For example: 6 kWh daily ÷ (4.5 sun hours × 0.75) = 1,778W. At 400W per panel, you need 5 panels minimum — round up to 6 for safety margin.

How many peak sun hours does Lagos get?

Lagos gets approximately 4.5 peak sun hours per day on average. This is among the lowest in Nigeria. Northern states like Sokoto get 6.5 hours and Kano gets 6.0 hours, meaning they need fewer panels for the same energy output.

What is the best solar panel wattage for homes in Nigeria?

400W monocrystalline panels are the current standard for residential solar in Nigeria. They offer the best balance of efficiency, size, and cost. 550W panels are available but are physically larger and more common in commercial installations.

How much do solar panels cost in Nigeria in 2026?

Solar panels cost ₦100,000-₦160,000 per 400W panel in Nigeria as of 2026, depending on brand. Tier-1 brands (JA Solar, Longi, Canadian Solar) cost ₦130,000-160,000. Budget panels cost ₦100,000-120,000. Total panel cost for a home system: ₦600,000-₦960,000.

How Many Solar Panels Do I Need to Power My Home in Nigeria?

A typical Nigerian home needs 6-8 solar panels (400W each) to power its daily electricity needs. The exact number depends on three factors: your daily energy consumption, your state’s peak sun hours, and the panel wattage you choose.

This guide shows you the exact calculation formula and helps you determine the right number of panels for your specific home.

The Solar Panel Sizing Formula

The formula used by professional installers (and SolarDecide’s calculator) is:

Panel Watts = (Daily kWh ÷ (Peak Sun Hours × System Efficiency)) × 1000
Number of Panels = Panel Watts ÷ Panel Wattage (e.g., 400W)

Where:

Daily kWh = your total daily energy consumption
Peak Sun Hours = hours of equivalent full sunshine per day (varies by state)
System Efficiency = 0.75 (accounts for wiring losses, temperature, dust, inverter conversion)

Peak Sun Hours Across Nigeria

Your location significantly affects how many panels you need. Here are peak sun hours for major Nigerian cities:

State/City	Peak Sun Hours	Relative Need
Sokoto	6.5	Fewest panels needed
Borno	6.2	Very good
Kano	6.0	Very good
Kaduna	5.8	Good
Plateau (Jos)	5.5	Good
FCT Abuja	5.2	Average
Kwara (Ilorin)	5.2	Average
Oyo (Ibadan)	5.0	Average
Enugu	4.9	Below average
Ogun	4.8	Below average
Lagos	4.5	More panels needed
Rivers (PH)	4.5	More panels needed
Bayelsa	4.5	Most panels needed

Source: Nigerian Meteorological Agency (NiMet) solar irradiance data

Key insight: A home in Lagos needs about 44% more panels than the same home in Sokoto to generate the same energy. This is why location matters.

Step-by-Step Example: 3-Bedroom Lagos Home

Step 1: Calculate daily energy consumption

Appliance	Qty	Watts	Hours/Day	Daily Wh
1HP AC	2	900W	8	14,400
Ceiling Fan	4	75W	10	3,000
Refrigerator	1	150W	24	3,600
LED TV	1	150W	6	900
DSTV Decoder	1	30W	6	180
LED Bulbs	6	9W	8	432
Phone Chargers	2	20W	3	120
Laptop	1	65W	8	520
Total				23,152 Wh = 23.2 kWh

That’s a high-usage home. Let’s be realistic and assume the ACs run 4 hours each (not 8), bringing it down to about 15.8 kWh/day.

Step 2: Apply the formula

Panel Watts = (15.8 ÷ (4.5 × 0.75)) × 1000
Panel Watts = (15.8 ÷ 3.375) × 1000
Panel Watts = 4,681W → Round up to 4,800W

Step 3: Calculate number of panels

Number of 400W panels = 4,800 ÷ 400 = 12 panels

That’s a significant array. For a more modest home running 1 AC for 4 hours:

Daily kWh ≈ 8.5 kWh
Panel Watts = (8.5 ÷ 3.375) × 1000 = 2,519W → 2,800W
Panels needed = 2,800 ÷ 400 = 7 panels

Solar Panel Pricing in Nigeria (April 2026)

Brand	Type	Wattage	Price per Panel
JA Solar	Mono PERC	400W	₦140,000
Longi	Mono PERC	400W	₦150,000
Canadian Solar	Mono PERC	400W	₦145,000
Jinko Solar	Mono PERC	400W	₦135,000
Budget/Generic	Poly	400W	₦100,000

Recommendation: Buy tier-1 panels (JA Solar, Longi, Canadian Solar, Jinko). They cost 20-40% more than generic panels but are more efficient, degrade slower, and come with 25-year performance warranties.

Common Panel Sizing Mistakes

Using rated sun hours instead of peak sun hours: Your state may get 12 hours of daylight, but only 4.5-6.5 hours of equivalent full sunshine. Always use peak sun hours.
Ignoring system efficiency losses: Real-world panels produce 25% less than their lab rating due to heat, dust, wiring, and inverter conversion. The 0.75 efficiency factor accounts for this.
Under-sizing for cloudy days: In southern Nigeria, consider adding 20% extra panel capacity to compensate for the rainy season (June-September).
Roof orientation: Panels facing south (in Nigeria, which is near the equator) perform best. East/west-facing panels produce 10-15% less.

Calculate Your Exact Panel Needs

SolarDecide’s free calculator automatically factors in your state’s sun hours, your appliance list, and system efficiency to give you the precise panel wattage needed. No guessing.

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