Solar and Inverter Installation in Lagos: The Complete Homeowner's Guide
If you're starting to research solar and inverter installation in Lagos, you've probably realized there's more to it than picking a package off a price list. This guide covers the whole picture: how the components work together, what decisions you'll need to make, and how the installation process actually runs.
The three components, explained simply
A backup power system for a Lagos home has three main parts, and it's worth understanding how they relate before you talk to any installer.
Solar panels generate electricity from sunlight. On their own, they don't store power or run your appliances directly, they just produce electricity while the sun is up.
The inverter does two jobs. It converts electricity into the form your appliances use, and it manages switching between power sources, solar, battery, generator, or grid, depending on what's available. See our inverter installation page for more detail.
The battery stores power so you have backup when the sun isn't shining or the grid is down. Without a battery, solar panels only help you during daylight hours while the sun is actually out.
Many Lagos homes start with just an inverter and battery for grid backup, then add solar panels later to reduce how much they depend on the grid and to extend backup time. Either approach is valid, and a good installer will tell you honestly which order makes sense for your budget.
Step 1: Work out your load
Before you think about brands or specs, list out what you actually want to run: lights, fans, a fridge, a TV, a router, air conditioners, a washing machine, office equipment. Add up the wattage (usually printed on the appliance or its manual) and think about how many hours a day you'd realistically run each one. This single exercise saves more money than any negotiation on price, because it stops you from paying for capacity you'll never use, or worse, buying a system that can't actually carry your home.
Step 2: Decide on backup duration
How many hours of backup do you want during an outage? A few hours to get through the evening is very different from wanting to run your whole home overnight. This decision drives your battery capacity directly.
Step 3: Choose your battery type
Lithium (LiFePO4) batteries cost more upfront, last significantly longer, charge faster, and need almost no maintenance. Tubular batteries cost less to buy but need regular water top-ups and typically last fewer years before replacement. We cover this in detail in our battery type comparison.
Step 4: Size your inverter
Your inverter's kVA rating needs to comfortably cover your combined load, with margin for appliances that draw extra power when they start up (like air conditioners and fridges). An undersized inverter trips constantly. An oversized one wastes money. This is exactly the kind of calculation a proper site visit is for.
Step 5: Decide how many solar panels, if any
If you're adding panels, the count and wattage depend on how much of your daily consumption you want to offset, your roof space, and your budget. More panels mean faster payback on fuel and grid costs, but a higher upfront investment.
What the installation process actually looks like
A properly run installation follows a predictable sequence:
- Load and site assessment. An installer visits, reviews your appliances and electricity bill, and inspects your roof and wiring.
- Written quote. You receive a document showing exactly what's being installed and why, with pricing broken down.
- Mounting and wiring. Panels are mounted and earthed, the inverter and battery are installed, and the changeover wiring is set up.
- Testing. The system is tested under its actual load before the installer calls the job complete.
- Handover. You get a walkthrough of the system, your warranty documents, and a maintenance schedule.
Most residential jobs take one to three days on-site once equipment has arrived. Read more in our guide on how long solar installation actually takes.
Common mistakes to avoid
A roof full of panels is wasted if your inverter can't handle the output or your battery can't store it, so never buy panels without matching them to the rest of the system. Choosing based on price alone is another common trap: the cheapest quote often means the cheapest components, and that usually shows up later as more frequent repairs. Skipping the load calculation and guessing your system size from your house size or your old generator's kVA rating leads to systems that are either undersized or oversized. And always ask about warranty terms before you pay a deposit, not after something breaks.
Where PowerNexa fits in
We install and maintain solar, inverter, and battery systems across Lagos, including Victoria Island, Lekki Phase 1, Ikoyi, Ajah, and beyond. Every project starts with the load calculation described above, not a generic package. If you're ready to get specific numbers for your home, request a free quote and we'll take it from there.