How much does solar installation cost in Nigeria? Labour alone: 10–15% of hardware (₦120k–₦300k for a 5 kVA build). Balance-of-system materials (rails, clamps, DC and AC cable, breakers, surge protection, earthing, combiner box): ₦330k–₦1.55m depending on size, roof type and cable runs. Installed 5 kVA packages including everything: ₦2m–₦5.5m (16 September 2026).
What installation costs
| Item | Typical range | What drives it |
|---|---|---|
| Labour, 1.5–2.5 kVA | ₦50,000–120,000 | One day, two people |
| Labour, 3.5–5 kVA | ₦120,000–₦300,000 | One to two days; roof access; distance from roof to battery room |
| Labour, 10 kVA | ₦250,000–600,000 | Two to three days; scaffolding; parallel inverters |
| Mounting rails and clamps | ₦8,000–15,000 per panel | Aluminium rail vs welded angle iron; concrete ballast |
| DC cable (4–6 mm² PV1-F), MC4 connectors | ₦1,200–2,500 per metre | Run length; string count |
| Battery cable (25–70 mm²) and lugs | ₦15,000–60,000 | Bank current; keep runs under 3 m |
| DC isolator, PV fuses / combiner, DC SPD | ₦40,000–150,000 | Number of strings; brand |
| AC changeover, breakers, AC SPD, distribution | ₦40,000–120,000 | Whether a separate "solar" sub-board is built |
| Earth rod, earth cable, bonding | ₦15,000–50,000 | Soil; distance |
| Transport, consumables | ₦20,000–80,000 | Location |
Quotations that show one line, "installation", are hiding where the money goes. Ask for it itemised as above, with the breaker and SPD brands named.
The installation process
| Step | What happens | What you should see |
|---|---|---|
| 1. Load audit | Every appliance listed with running watts, starting watts, hours per day and duty cycle; daily kWh and the largest simultaneous load computed. | A written sheet; if the installer skips this and quotes from the kVA you asked for, stop. |
| 2. Site assessment | Roof orientation, tilt, area, shading through the day (trees, tanks, neighbours), roof structure, distance from roof to inverter and battery location, ventilation, grid supply type (single/three phase) and generator connection. | Photos, measurements, a proposed panel layout. |
| 3. Design | Array sized on the worst month for your city; strings designed inside the inverter's MPPT window; battery sized on overnight energy; cable sizes and protection devices specified. | A single-line diagram and a bill of materials with model numbers. See the system pages for what this looks like. |
| 4. Mounting | Rails fixed to purlins or rafters (not to the sheet), clamps at the manufacturer's positions, minimum 5° tilt, 100 mm air gap beneath panels, walkway if the roof is large. | No panels screwed through the roofing sheet; sealed penetrations. |
| 5. DC wiring | PV1-F double-insulated cable in conduit or trunking, MC4 connectors crimped with the right tool, strings labelled, DC isolator and fuses at the combiner, DC surge protector. | Neat, labelled runs; no domestic twin-and-earth on the roof. |
| 6. Inverter and battery | Inverter wall-mounted with clearance for cooling; battery in a cool, ventilated, dry place within a few metres, fused at the terminal, cabled with correctly sized lugs. | Not in a hot roof void or a sealed cupboard. |
| 7. AC integration | Changeover or automatic transfer so grid, generator and inverter can never feed the same circuit at once; inverter output to a dedicated sub-board with its own breakers and residual-current device. | A clear, labelled way to isolate everything. |
| 8. Earthing and bonding | Panel frames and rails bonded; inverter chassis earthed; earth rod driven and tested; SPDs connected to earth. | An earth-resistance reading (aim ≤ 10 Ω). |
| 9. Commissioning | Voc and Isc measured per string and compared to datasheet; battery settings (chemistry, absorb, float, cut-off) set from the battery datasheet; output priority set; monitoring set up. | A commissioning sheet with the measured numbers. |
| 10. Handover | Explanation of the display, the isolators, what to do in an outage, cleaning schedule, warranty documents, installer's contact. | Documents, not a WhatsApp voice note. |
Protection and earthing that must be present
These are the items most often missing from cheap installations. Each is a fire, shock or equipment-loss risk.
- DC isolator between the array and the inverter, rated for DC at the string voltage (not an AC switch).
- String fuses or a combiner box when three or more strings are in parallel (a fault in one string can otherwise draw the others' current).
- DC surge protection device (SPD) at the inverter; Nigeria's lightning density makes this non-optional for roof arrays.
- Battery fuse or DC breaker at the battery terminal, rated above the inverter's maximum current and below the cable rating.
- AC breakers and a residual-current device (RCD) on the inverter output; an AC SPD where the grid is stormy.
- Changeover or automatic transfer switch so the inverter can never back-feed the grid or the generator.
- Earth rod and bonding of frames, rails, inverter and battery rack.
The applicable Nigerian standards are the Nigerian Electrical Installation Standards (based on IEC 60364) and the Nigerian Electricity Management Services Agency (NEMSA) certification regime for installers; ask whether the installer's electrician is NEMSA-certified. Grid-export (net metering) connections need DisCo permission and are rare for homes; most Nigerian systems are islanded from the grid by the changeover.
Solar arrays produce lethal DC voltages in daylight and cannot be switched off at the panel. Battery banks can deliver thousands of amps into a short circuit. Installation, wiring, earthing and commissioning must be done by a qualified installer or licensed electrician to the manufacturer's instructions and the Nigerian Electrical Installation Standards (IEC 60364-based). ZEUS explains how systems work so you can specify and check them, not so you can wire them yourself.
Cable sizing, in brief
Cable is sized for current (so it does not overheat) and for voltage drop (so power is not lost as heat over long runs). The battery side is where undersizing does the most damage.
I_batt = P_inverter_W ÷ V_bus ÷ η 5,000 W ÷ 48 V ÷ 0.92 = 113 A → 35–50 mm² copper for a 2–3 m run; 25 mm² is too small for 5 kVA
// PV string current
I_string = Isc × 1.25 14 A × 1.25 = 17.5 A → 4 mm² PV1-F for short runs, 6 mm² over 20 m
// voltage drop check, keep ≤ 3%
V_drop = 2 × L × I × ρ ÷ A ρ copper ≈ 0.0175 Ω·mm²/m
The installer's bill of materials should state cable sizes; if the battery cable is thinner than a finger on a 5 kVA system, ask why.
Roof and mounting
Nigeria's low latitude (Lagos 6.5° N, Kano 12° N) means a nearly flat array is close to optimal; the Global Solar Atlas gives an optimum fixed tilt of 7° in Lagos, 13° in Abuja and 16° in Kano. Anything from 5° to 15° facing anywhere between east and west through south loses only a few percent. Keep at least 5° so rain washes off dust and the Harmattan deposit.
- Aluminium long-span and corrugated sheets: rail-and-clamp to purlins with sealed brackets. Check that purlins are sound; older zinc roofs often are not.
- Concrete flat roofs: ballasted or bolted triangular frames; the easiest to work on and clean.
- Asbestos or fragile sheets: do not mount; ground-mount instead.
- Ground mounts: galvanised or angle-iron frames on concrete footings; more steel, easier cleaning, needs fencing.
Each 550 W panel weighs about 27 kg and presents 2.6 m² to the wind; an array of ten is a 270 kg sail. Mounting to the sheet alone with self-tappers is the most common structural failure ZEUS sees reported.
Commissioning and handover
At handover you should receive: the load audit, the single-line diagram, the bill of materials with serial numbers, a commissioning sheet with measured string Voc/Isc and earth resistance, the battery and inverter settings, warranty cards, and monitoring-app access. Take photos of the inverter settings screen. If the system is meant to prioritise solar over grid, check the "output source priority" and "charger source priority" settings yourself; wrong defaults are why some systems keep charging the battery from the grid all day.
Maintenance
| Interval | Task |
|---|---|
| Monthly (dry season: fortnightly) | Rinse panels with water early morning; no detergent, no abrasive. Dust can cost 10–20% in the Harmattan. |
| Monthly | Check the monitoring app: daily solar kWh should track the season; a sudden drop is a string fault or shading. |
| Monthly (lead-acid only) | Check electrolyte level, top up with distilled water; check terminals for corrosion. |
| Quarterly | Inspect cable entries, conduit, MC4 connectors for heat discolouration; check inverter fan and vents. |
| Yearly | Installer inspection: torque terminals, test earth, test RCD, review battery health (capacity test), check for roof leaks at penetrations. |
Choosing an installer
- They start with a load audit, not with "what kVA do you want".
- They size the array for your city and the worst month and can show the calculation.
- They provide an itemised bill of materials with model numbers and a single-line diagram.
- Protection devices and earthing are in the quote (DC isolator, fuses, SPDs, RCD, earth rod).
- The electrician is NEMSA-certified and the company has a physical address.
- They name who honours each warranty (manufacturer distributor vs the installer).
- References with systems older than two years, ideally one you can visit.
- They will commission with measurements and hand over documents.
- They are not the cheapest. The spread between quotations is mostly what has been left out.
ZEUS does not sell or install equipment and has no commercial relationship with any brand or retailer named on this page.
FAQ
How much does it cost to install solar panels in Nigeria?
Labour is 10–15% of hardware; for a 5 kVA system that is ₦120,000–₦300,000, plus ₦180,000–450,000 in mounting, cable, protection and earthing. Whole installed 5 kVA packages: ₦2m–₦5.5m (16 September 2026).
How long does installation take?
One day for a 1.5–2.5 kVA system, one to two days for 3.5–5 kVA, two to three days for 10 kVA, assuming materials are on site. Load audit and design should come a week or more before.
Can I install solar panels myself?
Mounting panels is carpentry; everything from the MC4 connector onward is electrical work at lethal DC voltages and battery currents that can weld a spanner. ZEUS does not recommend DIY wiring. Have a qualified installer do the electrical work and use this page to check it.
Which direction should solar panels face in Nigeria?
Roughly south at 5–15° tilt is optimal, but at Nigeria's latitude east- or west-facing roofs lose only a few percent. Never below 5°: dust and rain pooling cost more than orientation.
Do I need permission to install solar in Nigeria?
Not for an islanded home system behind a changeover. Feeding power into the DisCo network (net metering) requires the DisCo's approval and a compliant grid-tie inverter; estates and rented buildings may have their own rules.
Sources
- BusinessDay — What it costs to install solar in Nigeria today — businessday.ng/energy/article/what-it-costs-to-install-solar-in-nigeria-today
- SolarDecide — 5kVA system cost breakdown, Lagos/Abuja dealers (Apr 2026) — solardecide.com/blog/5kva-solar-system-cost-nigeria-2026
- Mercury Direct — 5kVA inverter guide, prices and batteries (2026) — mercurydirect.com.ng/5kva-inverter-guide-nigeria
- GVE Group — Solar panel installation in Nigeria, step-by-step (installer process description) — gve-group.com/solar-energy-installation-in-nigeria
- IEC 60364-7-712 (Solar photovoltaic power supply systems) and IEC 62548 (PV array design requirements), as the basis of Nigerian electrical installation practice
- Global Solar Atlas 2.0 — optimum tilt (OPTA) layer — globalsolaratlas.info