How to buy an inverter in Nigeria

An inverter is the part you will live with every day, and the one with the most confusing labels. This guide is for the moment you are about to buy: which type suits you, which numbers on the sheet matter, and how to spot a seller who is bending the truth. To work out the size first, use our inverter size guide and calculator.

The main types

What you will be offered
Type	What it does	Good for
Basic inverter / UPS	Charges a battery from the grid or a generator and runs your appliances from it when power goes. No solar input.	Homes and shops that get a few hours of grid power a day and do not want solar yet.
Hybrid (solar) inverter	Does the same and also has a built-in solar charge controller, so panels can charge the battery. Many can also feed the loads directly from the panels.	Most new home and small business systems.
Inverter with a separate charge controller	An inverter-charger plus a separate controller between the panels and the battery.	Systems that grow in stages, or where you already own a controller.
Grid-tie inverter	Sends solar power into the grid. Most switch off when the grid goes down.	Only where the grid is stable enough to rely on. A poor choice if your aim is backup during outages.

If the main reason you are buying is to have light when NEPA takes it, make sure the inverter is built for off-grid or backup use. A plain grid-tie unit will not give you power during an outage.

Pure sine wave or not?

Pure sine wave inverters produce power like the grid does. Cheaper modified or square wave units can make motors hum, run hot or fail, and may damage sensitive electronics such as TVs, laptops and some freezers.

For a home or shop, a pure sine wave inverter is the safer choice. Ask for it in writing, because ads sometimes use the term loosely.

The numbers that matter

Continuous output in watts (W). This is what the inverter can supply all day. It is the figure to compare against your load. VA is not the same as W: a unit rated in VA delivers fewer watts.
Surge or peak rating. How much it can give for a few seconds when a fridge, pump or air conditioner starts. Motors can need several times their running power for a moment.
System voltage (12, 24 or 48 V). Larger inverters use 24 or 48 V because it needs thinner, safer cables. Your batteries must be wired to match.
Solar input. For a hybrid: the maximum panel voltage and current it accepts, and the controller type (MPPT is more efficient than PWM). Check this against your panels with our compatibility checker.
Battery compatibility. Lead-acid only, or lithium too, and whether it can talk to a lithium battery's management system.
Efficiency and standby use. A unit that wastes a lot of power just sitting on drains the battery overnight.
Transfer time. How fast it switches to battery when the grid fails. Look for a short, UPS-style changeover if you run computers.
Protection. Overload, short circuit, low battery and over-temperature protection should all be listed.
Warranty. How many years, what it covers and where it is repaired.

Red flags when you are shopping

A big kVA number with no watt rating. Ask for continuous watts.
No datasheet or model number you can look up.
A price far below every other seller for the same size.
Claims that the unit "runs everything" without asking what you want to run.
No physical shop or address, or a seller who only wants payment up front by transfer to a personal account.
A warranty that exists only verbally or only on a WhatsApp chat.

What to ask the seller

What is the continuous watt rating and the surge rating of this exact model?
Is it pure sine wave, and what is the system voltage?
If it is a hybrid: what panel voltage and current does it accept, and is the controller MPPT?
Which batteries does it work with, and does it need a specific type or setting?
What is the warranty, who honours it and where do I take it for repair?
Can you give me the quote with brand and model written on it?

Ask two or three sellers the same questions. Honest answers match each other and match the datasheet.

Before and after you buy

Work out the size first, with room to grow, using the inverter size guide and the calculator.
Have an experienced installer fit it, with correct cable sizes, breakers and earthing.
Keep the receipt, the serial number and the warranty card together.
Make sure it has ventilation and is kept dry and out of direct sun.

Before you pay for an inverter

Know your load in watts and the surge from motors.
Choose the type: backup only, or hybrid for solar.
Insist on pure sine wave in writing.
Compare continuous watts, not kVA labels.
Check the system voltage matches your batteries.
Check panel voltage and current against the solar input.
Get brand, model, warranty and repair location on the receipt.

Listed solar installers and sellers

Businesses are listed free. Some were added from public business directories and some applied themselves; businesses can ask for removal at any time. UpNepa does not verify, recommend or guarantee any business here. Businesses marked Featured pay for extra visibility. Ask for references and get everything in writing before you pay.

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Frequently asked questions

What is the difference between an inverter and a UPS?

They are close relatives. Both switch to a battery when the grid fails. A UPS is built mainly to give a short, clean switch over for computers; an inverter is built to carry a house or shop for hours and usually has a larger charger and battery bank.

Should I buy a hybrid inverter?

If you plan to add solar now or later, yes: a hybrid has the solar charger built in. If you only want backup from the grid and a generator and do not plan solar, a basic inverter may do.

Is a bigger inverter always better?

No. Buying much more than you need costs more and wastes power just being switched on. Size it to your real load with some room to grow.

Does a pure sine wave inverter really matter?

For motors and electronics, yes. It is the safer choice for most homes and shops, and it is worth getting the claim in writing.

How long should an inverter last?

It depends on the quality, the load and the heat and dust it lives in. Look at the warranty length and who will actually repair it, rather than a seller's promise.