What Size Inverter Do I Need? A Nigerian Guide

Choosing the wrong inverter size is one of the most expensive mistakes Nigerian solar buyers make. Too small, and your system struggles or shuts off unexpectedly. Too large, and you've spent unnecessarily on capacity you'll never use. This guide helps you get it right.

What is kVA and why does it matter?

Inverter capacity is measured in kVA (kilovolt-amperes). Think of it as the "engine size" of your solar system — it determines how much load (appliances) the system can handle at once.

A common mistake is confusing kVA with kW (kilowatts). For most home applications in Nigeria: kVA ≈ kW × 1.25. So if your appliances need 2,400 watts (2.4kW), you need roughly a 3kVA inverter.

Step 1: List everything you want to power

Be honest with yourself here. Write down every appliance you want to run simultaneously during a power outage. This is your peak load.

Common Nigerian home appliances and their wattage:

Air conditioner (1.5HP)1,200W

Air conditioner (2HP)1,800W

Refrigerator150–200W

Deep freezer200–300W

Washing machine500W

Water pump (0.5HP)370W

Television (32")60W

Television (55")120–150W

LED bulb8–12W

Ceiling fan60–75W

Standing fan65–85W

Laptop45–80W

WiFi router10–20W

DSTV decoder20–30W

Step 2: Add up your total load

Example: A typical 3-bedroom Lagos home running 1 AC, 1 fridge, 1 freezer, 2 fans, 2 TVs, and 8 LED lights:

1 × AC (1.5HP)1,200W

1 × Refrigerator200W

1 × Deep freezer250W

2 × Ceiling fans140W

2 × TVs (32")120W

8 × LED bulbs80W

Total peak load1,990W

Step 3: Add a safety buffer

Inverters should never run at 100% capacity for extended periods — it damages them and shortens their lifespan. Add a 25–30% buffer to your total load. So 1,990W × 1.25 = 2,487W, which means you need at least a 3kVA inverter.

Quick guide: Which kVA do I need?

Scenario	Inverter Size	Typical Cost
Lights, fans, TV, router only	1–1.5kVA	₦80k–₦150k
Above + fridge + freezer	2–3kVA	₦150k–₦280k
Above + 1 AC (1.5HP)	3.5–5kVA	₦280k–₦500k
Multiple ACs + full home	7.5–10kVA	₦500k–₦1.2M
Commercial / large estate	15–20kVA	₦1.2M+

Should I go hybrid or off-grid?

Hybrid inverters work with both solar panels and the grid (NEPA). When NEPA is available, it charges your batteries. When it's out, solar takes over. This is the most popular choice in Lagos and Abuja where NEPA is unreliable but present.

Off-grid inverters work entirely from solar and batteries — no grid connection at all. This is better for remote locations where NEPA doesn't reach, or for customers who want total energy independence.

Common brands in Nigeria

Reputable inverter brands you'll encounter from verified installers:

Victron Energy — Premium European brand, popular for larger installations
Growatt — Good mid-range option, reliable and affordable
Schneider Electric — Commercial grade, excellent for businesses
Luminous — Popular in residential market, good value
Felicity Solar — Made for African markets, excellent warranty support

What about batteries?

Your inverter capacity must match your battery bank. A 3kVA inverter typically needs 200–400Ah of battery capacity for 4–8 hours of backup. Lithium (LiFePO4) batteries are better than lead-acid — they last 10+ years vs 2–4 years, and you can discharge them deeper. Budget for lithium if you can.