How Many Sun Hours Does Nigeria Get? Lagos vs Abuja vs Kano

What "peak sun hours" actually means

Solar installers don't mean "hours of daylight" when they talk about sun hours — they mean peak sun hours: the number of hours per day, on average, that the sun delivers a full 1,000 watts per square metre of energy. A location can have twelve hours of daylight and still only get five peak sun hours, because early morning and late afternoon light is weaker and often diffused by cloud or haze.

It's the number that actually determines what your panels produce. Two systems of the same size — one in a place with 4.5 peak sun hours, one with 6 — will generate meaningfully different daily kWh, even on a technically "sunny" day in both.

Nigeria: peak sun hours by city

Nigeria's solar resource is strong and consistent by global standards, but it isn't flat across the country. The north runs noticeably higher than the coast — mostly down to cloud cover and humidity in the south, not any real difference in day length.

Nationally, daily solar radiation averages around 5.25 kWh/m² — in peak-sun-hour terms, roughly 5.25 hours — ranging from about 3.5 in the wettest coastal zones up to 7.0 in the far north. Anywhere between Lagos and Abuja sits close to the national average. Further north, you're doing noticeably better than most of the country; further into the Niger Delta, worse.

Why this number matters more here than almost anywhere else

In the UK, peak sun hours mostly tell you how much you'll shave off a grid bill or earn back through a Smart Export Guarantee payment. In Nigeria, they're closer to a survival number.

DisCo supply in most Nigerian cities runs under 12 hours a day, and in large parts of Lagos, Abuja and Port Harcourt it's under 6. The national grid has already collapsed twice in the opening weeks of 2026 alone, on top of nine separate collapses through 2024 — so for most households, the grid isn't really the backup plan. The generator, or the inverter-and-battery setup, is the primary plan, and DisCo power is the bonus.

That reframes what peak sun hours are actually for. It's not "how much can I export." It's "how many hours of generator fuel do I not have to buy today." That math is decisive: running a petrol or diesel generator typically costs five to ten times as much per kWh as grid electricity — even at 2026's Band A rates, around ₦210–226 a unit for the best-served customers. A solar-plus-battery setup that reliably covers evening lighting, fans, the fridge and the TV isn't a nice-to-have bolted onto a generator. For a lot of households, it's what stops the generator running every single night.

It's also a big part of why off-grid and hybrid solar has grown so fast — installed solar capacity in Nigeria jumped 141% in 2025 alone, and off-grid systems now make up around 96% of everything installed. Most of that growth isn't utility-scale. It's households and small businesses doing exactly this calculation.

Turning sun hours into what your system can actually run

The formula solar installers use is the same everywhere:

Daily kWh = System size (kW) × Peak sun hours × System efficiency

A typical efficiency figure of 75–80% covers inverter losses, battery charge/discharge losses, wiring, and temperature effects — panels lose a little efficiency as they get hotter, which matters more in Nigeria than in the UK.

So a 2 kW hybrid system in Lagos (4.75 average peak sun hours):

2 × 4.75 × 0.77 ≈ 7.3 kWh a day

The same 2 kW system in Kano (6.25 average peak sun hours):

2 × 6.25 × 0.77 ≈ 9.6 kWh a day

That's the difference between comfortably running a fridge, fans, TV and lighting through the evening, and still leaning on the generator for part of it — before you've changed a single panel.

Harmattan, dust, and why your real output can drift from the forecast

The far north has the country's best sun hours, but it also gets the country's worst harmattan — the dry-season dust that blows down from the Sahara roughly between November and March. Dust settling on panels during harmattan can cut output by 15–25% if they aren't cleaned regularly, which is a bigger swing than most people budget for when they size a system.

It's one of the reasons a forecast is more useful than a fixed spec-sheet number: your panels' theoretical output, based on their rating and your city's sun hours, is one thing — what they actually deliver on a dusty February afternoon is another. Sun Hours' Panel Cleaning Advisor flags exactly this — the kind of thing that matters far more in Kano in February than it does in Kent in February.

How Sun Hours handles this

I built Sun Hours for UK plug-in and rooftop solar owners who wanted a straight answer to "how much will my panels make today" without setting up an account or learning what a performance ratio is. It turns out the same two inputs — your location, and the best day your system has ever produced — work just as well for a hybrid inverter setup in Lagos as they do for a balcony panel in London, because the forecast runs on the same global weather and satellite irradiance data everywhere: Open-Meteo for the day-to-day forecast, NASA POWER for the historical baseline.

I didn't build this with Nigeria in mind, and I'll say that plainly rather than pretend otherwise — the app has been climbing the download charts there without me doing anything to court it, which is honestly why I sat down and did the research behind this post. But the mechanics hold up: tell it your city and your system's best day, and it gives you a 7-day forecast scaled to your actual setup, not a generic average. No spreadsheets, no kWp lookup tables, no assuming your panels perform like the ones in a manufacturer's datasheet.