The most common — and most expensive — mistake in Nigerian solar is wrong sizing. An oversized system ties up money you didn't need to spend; an undersized one trips off the moment the pumping machine starts. Here is the exact method our engineers use, simplified so you can do it at your dining table.

Step 1: List Your Appliances and Their Wattage

Walk through your home and write down everything you want solar to power, with its wattage (check the label or manual). A typical example:

Total running load ≈ 1,810W

Step 2: Size the Inverter

Your inverter's continuous rating should be at least 125% of your running load, to absorb motor start-up surges (fridges and pumps briefly draw 2–3× their running power).

1,810W × 1.25 ≈ 2,260W → the next standard size up is a 3.5kVA inverter. That extra headroom is what keeps the system stable when the compressor kicks in.

Step 3: Calculate Daily Energy Consumption

Multiply each appliance by the hours you actually use it. For the home above, a realistic figure is 10–12kWh per day if the AC runs through the night, or 6–7kWh without it.

Step 4: Size the Battery Bank

Decide how many hours of autonomy you need after sunset — for most Abuja homes that's 10–14 hours (evening to morning). If your overnight consumption is 5kWh:

Step 5: Size the Solar Array

Nigeria enjoys 4.5–6 peak sun hours daily. To generate 10kWh/day in Abuja (≈5 sun hours), you need roughly 10 ÷ 5 ÷ 0.8 (system losses) = 2.5kW of panels — about five 550W panels. We always add margin for harmattan haze and cloudy days.

Let the Professionals Confirm It

This method gets you close, but roof orientation, shading, cable runs and future load growth all shift the final design. IsiPower Hub's free site survey measures everything and gives you a guaranteed-fit design. Book yours today — it costs nothing and could save you millions.