What size inverter do I need for my home in Nigeria?

The inverter size depends on your total appliance load and surge requirements. A typical 3-bedroom home in Nigeria with 2 air conditioners, a fridge, TV, fans, and lights needs approximately a 5kVA inverter. Use SolarDecide's free calculator to get your exact size.

How do I calculate inverter size in kVA?

Add up the wattage of all appliances you'll run simultaneously, multiply motor loads (ACs, pumps, fridges) by their surge factor (2-3x), divide by the power factor (0.8), then round up to the nearest standard inverter size: 1, 1.5, 2, 3, 5, 7.5, 10, 15, or 20 kVA.

Can a 3.5kVA inverter power a 1.5HP air conditioner?

A 1.5HP AC draws about 1,200W running but surges to 3,600W at startup (3x surge factor). After accounting for the 0.8 power factor, you need at least 4,500VA (4.5kVA) for the AC alone. A 3.5kVA inverter would be undersized and could trip or shut down.

What is the difference between kVA and kW for inverters?

kVA (kilovolt-amperes) is the apparent power rating, while kW (kilowatts) is the real power. They are related by the power factor: kW = kVA × power factor. Most inverters use a power factor of 0.8, so a 5kVA inverter delivers about 4kW of real power.

How much does a 5kVA inverter cost in Nigeria in 2026?

A quality 5kVA hybrid solar inverter costs between ₦600,000 and ₦900,000 in Nigeria as of 2026, depending on the brand. Popular brands include Luminous (₦650k-750k), Felicity (₦600k-700k), and Growatt (₦750k-900k). Prices vary by location and dealer.

What appliances can a 5kVA inverter run in Nigeria?

A 5kVA inverter (delivering 4kW) can typically run: 1 air conditioner (1HP), a refrigerator, a chest freezer, a TV, 4 ceiling fans, 8 LED bulbs, phone chargers, and a laptop — all simultaneously. You cannot add a second AC or heavy appliances like an electric iron without exceeding capacity.

How to Calculate the Right Solar Inverter Size for Your Home in Nigeria

A 5kVA inverter is the most popular residential solar inverter size in Nigeria, but it may not be right for your home. The correct inverter size depends on your specific appliance load and surge requirements — getting it wrong means either wasting money on an oversized unit or risking equipment damage from an undersized one.

This guide walks you through the exact calculation used by professional solar installers to determine your ideal inverter size, with real Nigerian appliance wattages and 2026 pricing.

Why Does Inverter Sizing Matter?

Choosing the wrong inverter size is the most common and most expensive mistake Nigerian homeowners make when going solar. Here’s what happens:

Undersized inverter: Shuts down when you turn on your AC or freezer. The startup surge exceeds the inverter’s capacity, causing it to trip repeatedly. This damages both the inverter and your appliances.
Oversized inverter: Works fine but you’ve wasted ₦200,000–₦500,000 on capacity you’ll never use. That money could have bought more batteries (more backup hours) or more panels (faster charging).

The goal is to match your inverter to your actual peak load plus surge, not to guess or buy whatever the installer recommends.

Step 1: List All Your Appliances and Their Wattage

Every electrical appliance has a wattage rating. Here are the standard wattage values for common Nigerian household appliances in 2026:

Appliance	Running Watts	Surge Factor	Surge Watts
1HP Air Conditioner	900W	3.0x	2,700W
1.5HP Air Conditioner	1,200W	3.0x	3,600W
Ceiling Fan	75W	1.2x	90W
Standing Fan	60W	1.2x	72W
LED TV (150W)	150W	1.0x	150W
DSTV Decoder	30W	1.0x	30W
Laptop	65W	1.0x	65W
Phone Charger	20W	1.0x	20W
LED Bulb (9W)	9W	1.0x	9W
Refrigerator	150W	2.5x	375W
Chest Freezer (200L)	150W	2.5x	375W
Microwave	1,200W	1.0x	1,200W
Electric Kettle	1,500W	1.0x	1,500W
Washing Machine	500W	2.0x	1,000W
0.5HP Water Pump	400W	3.0x	1,200W

Important: Motor-driven appliances (air conditioners, refrigerators, freezers, pumps, washing machines) draw 2-3 times their running wattage when starting up. This “surge” or “inrush current” lasts only a few seconds but your inverter must handle it.

Step 2: Calculate Your Total Running Load

Add up the wattage of all appliances you plan to run at the same time. Not everything in your house runs simultaneously — you won’t use the microwave and electric kettle while watching TV and running the AC.

Example — Typical 3-bedroom Lagos home:

Appliance	Qty	Watts Each	Total Running
1HP Air Conditioner	2	900W	1,800W
Ceiling Fan	4	75W	300W
Refrigerator	1	150W	150W
LED TV	1	150W	150W
DSTV Decoder	1	30W	30W
LED Bulbs	6	9W	54W
Phone Charger	2	20W	40W
Laptop	1	65W	65W
Total			2,589W

Step 3: Calculate Peak Surge Watts

Now apply the surge factors to get the maximum instantaneous demand:

Appliance	Qty	Surge Watts	Total Surge
1HP AC (3.0x)	2	2,700W	5,400W
Ceiling Fan (1.2x)	4	90W	360W
Refrigerator (2.5x)	1	375W	375W
LED TV (1.0x)	1	150W	150W
DSTV Decoder	1	30W	30W
LED Bulbs	6	9W	54W
Phone Charger	2	20W	40W
Laptop	1	65W	65W
Total Surge			6,474W

Step 4: Convert to kVA

Divide the peak surge watts by the power factor (0.8):

Inverter VA = 6,474W ÷ 0.8 = 8,093 VA = 8.09 kVA

Round up to the nearest standard inverter size: 10 kVA.

Wait — that seems high. And it is. In practice, not all surge loads happen simultaneously. The ACs don’t start at the exact same second as the fridge compressor kicks in.

Most installers in Nigeria use the running load with a 25% safety margin for residential installations. But SolarDecide’s calculator uses the full surge calculation because it’s the technically correct approach — and it protects you from trips and shutdowns.

For our Lagos example: a 7.5kVA or 10kVA inverter is the correct choice. A 5kVA would be insufficient if both ACs are running.

How Much Does Each Inverter Size Cost in Nigeria?

Here are average retail prices for quality hybrid solar inverters in Nigeria as of April 2026:

Size	Luminous	Felicity	Growatt
1kVA	₦120,000	₦100,000	₦150,000
2kVA	₦250,000	₦220,000	₦280,000
3kVA	₦380,000	₦350,000	₦420,000
5kVA	₦700,000	₦650,000	₦800,000
7.5kVA	₦1,000,000	₦950,000	₦1,100,000
10kVA	₦1,400,000	₦1,300,000	₦1,500,000

Source: SolarDecide market research, Lagos and Abuja dealer prices, April 2026. Prices vary by location.

Common Inverter Sizing Mistakes in Nigeria

Ignoring surge watts: Buying a 3.5kVA for a home with 2 ACs. The installer says “it can handle it” — until both ACs try to start.
Sizing for future loads: Buying a 10kVA “just in case” when 5kVA is enough today. Buy for your current load plus 20% growth margin.
Confusing kVA with kW: A 5kVA inverter delivers 4kW (not 5kW). Always use the kVA rating with the power factor calculation.
Not accounting for the water pump: A 1HP water pump surges to 2,250W at startup. Many people forget this load because the pump runs intermittently.

What If My Load Exceeds 20kW?

If your total running load exceeds 20kW (20,000W), you’re in commercial territory. Commercial solar systems require:

Three-phase power
Multiple inverters in parallel
Professional load balancing
Custom battery configurations

For commercial installations, we recommend contacting a certified solar installer directly. Use our calculator to estimate your system requirements, then request a quote from a verified installer.

Calculate Your Exact Inverter Size Now

Don’t guess your inverter size. SolarDecide’s free solar calculator lets you select your exact appliances, set your hours of use, and see the precise inverter kVA you need — along with battery size, panel wattage, and payback period.

The calculator is free, independent, and uses the same methodology described in this guide. No registration required.

Related tools:

Appliance Power Checker — See how many watts your home uses
Generator vs Solar Comparison — Compare running costs side by side
Fuel Cost Calculator — Calculate your annual generator fuel costs