So you want solar. What does that actually mean?

By the IsaKiel team · Lagos · Updated 4 August 2026 · 7 min read

Nearly every conversation starts the same way: "I want to do solar."

And that's the right place to start. But solar isn't something you simply buy and put on your roof. It's a system, and the panels you can see are only one part of it. Often, they aren't even the most expensive part.

There's a bit more to getting it right than most people realise. This is the explanation a good installer would give you if they had the time to sit down and walk you through it properly.

Solar is a system, not a panel

The easiest way to understand a solar system is to think about a borehole and water tank:

• The sun is the water source.
• The panels are the pump. They turn sunlight into electricity, mainly while daylight is available.
• The battery is the tank. It stores electricity so you can use it after sunset.
• The inverter is the control system and plumbing. It converts that electricity into the form your appliances use, manages charging and discharging, and chooses between solar, battery, grid and generator.
• Your appliances are the taps.

A pump can supply water while it is running, but the tank is what lets you use water later. Solar works the same way: panels can power daytime appliances without a battery, but they cannot supply stored solar energy at night.

This is why people who price only the panels are often surprised by the final quote. They are pricing the pump, but forgetting the tank, controls, pipes and installation.

What a system actually looks like

The three parts — and the fourth nobody mentions

• 1. Solar panels Measured in kW · about 31% of the bill · up to a 25-year performance warranty; product warranties vary

  Glass and silicon on your roof, with no moving parts — though they do need occasional cleaning and a periodic check of the mountings and connections. They generate direct current (DC) whenever there is daylight, less on a heavily overcast day, and none at night. During the day they power the house directly, and whatever is left over charges the battery, if you have one.

• 2. Battery Measured in kWh · about 40% of the bill · typically a 5–10 year warranty, subject to cycle and installation conditions

  The tank, and the reason the system still works after sunset. Modern systems use LiFePO4 lithium, which handles Nigerian heat far better than the older lead-acid type. This is the single most expensive item, the one that decides how long you last through an outage, and the first thing to fail if the system is badly installed.

• 3. Hybrid inverter Measured in kVA · about 12% of the bill · 2-year warranty

  The control system and the plumbing. It converts DC into the AC your sockets need, manages charging and discharging, and second by second decides where your power comes from. A hybrid inverter typically works with solar, battery and grid power; generator compatibility depends on the model. It also protects your appliances from surges. How long it lasts depends heavily on the brand, the quality of the installation, and the conditions it runs in.

• 4. Everything else About 17% of the bill · the part quotes hide

  Mounting frames, DC cabling, AC cabling, breakers, surge protection, a changeover, labour, commissioning. Unglamorous and non-negotiable.

What a day actually looks like

Understanding the daily rhythm is what makes the sizing make sense:

• Morning. The sun comes up and the panels start producing. That power runs whatever is on in the house first; the surplus goes into charging the battery.
• Midday. Peak production. On a good day the battery is filling steadily while the house runs entirely on solar.
• Evening. Production falls to nothing. The house switches over to the battery — and this is when you are using the most power.
• Night. You are running purely on what the battery stored. If it runs low, a hybrid inverter can top up from NEPA, or you start the generator.

Which is why "how many panels do I need?" is the wrong opening question. The right one is "how much power do I use after dark?" — that is what sets your battery size, and the battery is often the biggest cost driver.

The three numbers that confuse everyone

Quotes throw kW, kWh and kVA around as if they are interchangeable. They are not, and mixing them up is how people end up with the wrong system. Back to the water tank:

A common mistake: buying a big inverter and a small battery. That is a wide tap on a small tank — you can run plenty at once, but not for long.

What solar will not do

• It is not free electricity. It is paying several years of generator fuel money upfront, in one go, in exchange for silence and no queues.
• It will not run everything by default. A system is sized to a specific list of appliances. Add a second AC afterwards and you may exceed what you paid for.
• Panels alone do nothing at night. Worth repeating, because it is the assumption behind most disappointed buyers.
• It does not have to replace your generator on day one. Most Nigerian setups run alongside a gen, and use far less fuel. Going fully off-grid is a choice, not a requirement.

Where to start

Not with a quote. Start by working out what you actually run and what that adds up to after dark — because until you know your kWh, every quote you receive is a number you cannot check. Once you have that, three quotes for the same specification will tell you very quickly who is being straight with you.

For what the parts actually cost today, we keep a separate guide updated against real Alaba market prices and installer quotes: How much does solar cost in Lagos in 2026?

Going deeper

This guide is the overview. Each component has its own detail — panels and roof orientation, battery chemistry and lifespan, inverter sizing and brands — and we are writing those up one at a time. If you only read one more thing, make it the cost breakdown: How much does solar cost in Lagos in 2026?