The familiar cheer of “Up NEPA!” is no longer joyful in 2025. Nigeria’s national grid delivers only about 4,000 – 4,500 MW on most days, although the country has more than 13,000 MW installed capacity[1]. Chronic blackouts and grid collapses—over ten national outages were recorded in 2024, and several more occurred in 2025[2]—force families and businesses to rely on millions of petrol and diesel generators. These noisy machines produce an estimated 40,000 MW, far more than the grid[3], but rising fuel costs and air‑pollution make them unsustainable. Add frequent fuel scarcity and long queues, and you begin to see why Nigerians are turning to solar. A properly sized solar + inverter + battery system offers quiet, reliable electricity and cuts generator spending for decades, especially as sunlight is abundant across the country. This guide explains how many solar panels you need for a 24/7 power supply in Nigeria, with simple formulas, Nigeria‑specific assumptions, worked examples and a checklist to avoid costly mistakes.
What “24/7 Power Supply” Really Means in Nigeria
“24/7 power” does not mean the sun is shining all day—it means your home or business remains powered continuously. A Nigerian 24/7 solar system includes:
- Solar panels for daytime generation. Nigeria enjoys 4 – 7 peak sun hours depending on location, so panels must capture enough energy during the day.
- Inverter and batteries for nighttime and cloudy periods. Batteries store energy; the inverter converts DC from the panels/batteries to AC for your appliances.
- Hybrid backup (grid or generator) when budgets or loads require it. Hybrid systems are common because they automatically switch between solar, batteries and the grid. Off‑grid systems require larger battery banks and more panels but deliver complete independence[4].
A “24/7 solar” system therefore means daytime solar generation plus nighttime battery autonomy. In practice, hybrid systems remain smart for most Nigerian homes. They reduce reliance on PHCN and generators but still allow a backup during long rainy spells or extended harmattan dust.
The Quick Formula: How Many Solar Panels You Need (Simple Version)
A repeatable sizing formula helps you avoid guesswork. Here’s a simplified version that works for most Nigerian homes:
Number of panels = (Daily energy consumption × Loss factor) ÷ (Panel wattage × Peak sun hours)
- Daily energy consumption: Sum of all appliances’ watt‑hours (Wh) consumed in 24 hours. A load audit (next section) determines this number.
- Loss factor: Accounts for system inefficiencies—heat, dust, inverter inefficiency, wiring losses and battery charging. Nigerian guides recommend adding 20 – 25 % to your load to cover these losses[5][6].
- Panel wattage: The rated output of each solar panel (e.g., 350 W). Use the STC (Standard Test Conditions) rating printed on the panel.
- Peak sun hours: Average hours per day when sunlight is strong enough to produce peak output. Nigeria’s peak sun hours range from 4–7 hours depending on region; choose a conservative figure (e.g., 4.5–5 hours) to stay safe.
Example: If your daily consumption is 10 kWh (10,000 Wh) and you plan for 20 % losses, the effective energy required is 12,000 Wh. Using 350 W panels and assuming 5 peak sun hours, the number of panels is:
Number of panels = 12,000 Wh ÷ (350 W × 5 h) ≈ 6.9 ≈ 7 panels
Round up to the nearest whole panel and consider adding a panel or two for redundancy and future growth.
Step‑by‑Step: Calculate Your Daily Energy Use (The Load Audit)
Sizing begins with an honest assessment of what you power. Guessing hours ruins sizing, so monitor your appliances’ usage. Follow these steps:
- List every appliance and its rated power (W). Appliance labels or user manuals show wattage. Some typical Nigerian appliance ratings include ceiling fans (60–85 W), standing fans (70 W), refrigerators (100 – 300 W), televisions (100 – 200 W) and laptops (50 – 100 W)[7][8]. Air conditioners draw 1,000–2,000 W[8], and water pumps or washing machines can exceed 600 W[7].
- Estimate daily usage (hours/day) for each device. For example, lights may run 6 hours at night; a refrigerator cycles on and off but often averages 10 – 12 hours of run time[9].
- Calculate watt‑hours (Wh) per appliance: Multiply the wattage by hours of use. For instance, a 100 W TV running 5 hours uses 500 Wh/day.
- Add surge loads: Appliances with motors (refrigerators, pumps, air conditioners) draw higher starting power for a few seconds. Inverter sizing should account for this surge; battery sizing usually focuses on running power.
- Sum all watt‑hours to obtain your daily energy consumption. This figure (in kWh) feeds into the panel and battery calculations.
Why include everything?
Undersizing is the number one mistake identified by solar installers. Even small “phantom loads” such as phone chargers or decoders contribute to total consumption[10]. Document every device, and consider future additions. Oversizing by 10–20 % for growth prevents expensive upgrades later.
Nigeria Sunlight Reality: Peak Sun Hours by Region (North vs South)
Nigeria’s geography shapes how much solar energy your panels will harvest. According to a 2024 Nigerian guide, average peak sun hours are:
| Region | Peak sun hours (approx.) | Notes |
| Northern Nigeria | 6 – 7 hours | States like Kano and Kaduna enjoy abundant sunshine; 5–6 hours is a safe design value[11]. |
| Central Nigeria | 5 – 6 hours | Abuja and Plateau have strong sun except during rainy months. |
| Eastern Nigeria | 5 – 6 hours | Enugu and Anambra still receive good radiation. |
| Western Nigeria | 4 – 6 hours | Lagos, Ogun and Oyo get around 4–5 hours; dust and humidity reduce output. |
| Southern Nigeria | 4 – 5 hours | Coastal areas like Port Harcourt and Warri experience more cloud cover and rain. |
During the rainy season (May–September), cloud cover reduces irradiation, especially in the south. Use the lower end of the range for design, and clean panels regularly to remove harmattan dust, which also reduces output.
Account for Losses: Heat, Dust, Inverter Efficiency & Wiring
No system is 100 % efficient. Factor in these losses when sizing:
- Inverter efficiency: High‑quality inverters convert DC to AC with 90–95 % efficiency. Lower‑quality units may waste 10 % or more. Experts recommend oversizing your solar array by 20–25 % to offset inverter and wiring losses[5].
- Cable losses: Poor wiring or incorrect fusing can lead to 10–20 % energy loss[6]. Use proper gauge copper cables and install fuses/circuit breakers[12].
- Heat and dust: High temperatures reduce panel efficiency, and dust accumulation can block sunlight. In Nigeria’s tropical climate, panels may produce 15 % less than their rated output. Regular cleaning and adequate ventilation mitigate these losses[13].
- Battery inefficiencies: Charging and discharging batteries also cause losses (around 5–10 %). Choose lithium batteries for higher efficiency and deeper discharge (80–90 % DoD)[14].
Apply a safety buffer (e.g., 25 %) to your daily energy consumption to cover these inefficiencies when calculating panels and batteries.
Worked Examples (With Real Nigerian Appliances)
The following examples use typical Nigerian appliances and conservative assumptions (5 peak sun hours, 20 % losses) to illustrate sizing. Disclaimer: Actual sizing varies; always conduct a professional load audit.
Example A — Basic Home Setup
Appliances: LED lights (6 × 10 W), ceiling fans (2 × 70 W), standing fan (1 × 70 W), TV + decoder (100 W), Wi‑Fi router (10 W), small refrigerator (100 W). Assume lighting 6 hrs, fans 10 hrs (harmattan nights are hot), TV/decoder 5 hrs, router 24 hrs, fridge compressor runs 12 hrs/day[7].
| Appliance | Power (W) | Hours/day | Daily Wh |
| 6 LED bulbs | 60 W | 6 h | 360 Wh |
| 2 ceiling fans | 140 W | 10 h | 1,400 Wh |
| 1 standing fan | 70 W | 10 h | 700 Wh |
| TV + decoder | 100 W | 5 h | 500 Wh |
| Wi‑Fi router | 10 W | 24 h | 240 Wh |
| Small refrigerator | 100 W | 12 h (average) | 1,200 Wh |
| Total | — | — | 4,400 Wh (4.4 kWh) |
Step 1 – Adjust for losses: 4.4 kWh × 1.2 (20 % losses) = 5.3 kWh/day.
Step 2 – Solar array:
Panel capacity (kW) = 5.3 kWh ÷ 5 h = 1.06 kW
Number of 350 W panels = 1,060 W ÷ 350 W ≈ 3.0 ⇒ 3–4 panels
Because you can’t install 3.0 panels, round up to 4 panels. Extra panels help during rainy days and supply some power to charge batteries faster.
Step 3 – Battery bank: Aim for 12 hours of autonomy (nighttime). Daily consumption is 5.3 kWh; half of that (for 12 hours) is 2.65 kWh. Using lithium batteries with 80 % DoD[14]:
Required battery capacity = 2.65 kWh ÷ 0.8 ≈ 3.3 kWh
A 48 V battery bank with 3.5 kWh capacity meets this need (e.g., one 48 V 75 Ah lithium battery). For lead‑acid batteries (50 % DoD), double the capacity to roughly 5.3–6 kWh.
Step 4 – Inverter size: The highest simultaneous load occurs when all fans, lights, TV and fridge run. That is ≈ 370 W + 100 W + 100 W = 570 W, plus surge for the fridge (3×). A 1.0 kVA pure sine‑wave inverter easily handles this and leaves room for additional devices.
Example B — Family Home Setup
This scenario adds a freezer (150 W), washing machine (600 W) used 2 hours/week (≈0.3 h/day), pumping machine (1 HP ≈ 746 W) running 30 minutes/day and extra lights/fans. Air conditioners are excluded (they require much larger systems).
| Appliance | Power (W) | Hours/day | Daily Wh |
| Lighting (10 bulbs) | 100 W | 6 h | 600 Wh |
| 4 fans (mix of ceiling and standing) | 280 W | 10 h | 2,800 Wh |
| TVs + decoder + laptop | 200 W | 5 h | 1,000 Wh |
| Wi‑Fi router | 10 W | 24 h | 240 Wh |
| Refrigerator (medium) | 150 W | 12 h | 1,800 Wh |
| Freezer | 150 W | 12 h | 1,800 Wh |
| Washing machine | 600 W | 0.3 h | 180 Wh |
| Water pump (1 HP) | 746 W | 0.5 h | 373 Wh |
| Total | — | — | 8,793 Wh (≈ 8.8 kWh) |
Loss adjustment: 8.8 kWh × 1.25 = 11 kWh (use 25 % buffer because more heavy loads and long cables).
Solar array: 11 kWh ÷ 5 h = 2.2 kW. Using 350 W panels: 2,200 W ÷ 350 W ≈ 6.3 ⇒ 7 panels. Consider 8 panels to ensure adequate charging for batteries and occasional extra loads. If you install higher‑efficiency 400 W panels, you need fewer.
Battery bank: For 12 hours autonomy, half the daily consumption is 5.5 kWh. With lithium batteries (80 % DoD): 5.5 ÷ 0.8 ≈ 6.9 kWh. Two 48 V 150 Ah lithium batteries (≈7 kWh) will suffice; a lead‑acid system would need ~11 kWh.
Inverter size: Peak simultaneous load includes fans (280 W), fridge and freezer (300 W), pump (746 W) and washing machine (600 W) during operation. Peak running power ≈ 1.9 kW; the pump’s starting surge (≈ 3 kW) requires headroom. A 3.5–5 kVA inverter provides adequate continuous and surge capacity. Always choose pure sine‑wave models to protect appliances[15].
Example C — Small Business (Shop/Office)
A small retail shop or office might power laptops, printer, CCTV cameras, lights, fans and a fridge. Assume business hours are 8 a.m. to 8 p.m. (12 hours) with minimal overnight load (security lighting and CCTV).
| Appliance | Power (W) | Hours/day | Daily Wh |
| 8 LED bulbs | 80 W | 12 h | 960 Wh |
| 2 ceiling fans | 140 W | 12 h | 1,680 Wh |
| 3 laptops | 210 W | 8 h | 1,680 Wh |
| Printer (inkjet) | 30 W | 1 h | 30 Wh |
| CCTV + router | 30 W | 24 h | 720 Wh |
| Medium refrigerator | 150 W | 12 h | 1,800 Wh |
| Point‑of‑sale terminal | 20 W | 10 h | 200 Wh |
| Total | — | — | 7,070 Wh (≈ 7.1 kWh) |
Add 20 % losses: 7.1 × 1.2 ≈ 8.5 kWh.
Solar array: 8.5 kWh ÷ 5 h = 1.7 kW; number of 350 W panels = 1,700 ÷ 350 ≈ 5 panels. Round up to 6 panels for rainy days.
Battery bank: The business is open mostly in daylight, so overnight consumption is lower. Suppose you want 6 hours of backup for security: half the daily consumption × (6/24) = 7.1 kWh × 0.25 ≈ 1.8 kWh. With lithium batteries (80 % DoD), required capacity ≈ 2.3 kWh. A single 48 V, 50 Ah lithium battery (~2.4 kWh) suffices.
Inverter: Peak load ≈ fans (140 W) + fridge (150 W) + laptops (210 W) + printer (30 W) ≈ 530 W. Surge is small (no pumps). A 1–1.5 kVA inverter is adequate.
These examples illustrate that the number of solar panels depends more on daily energy use than on inverter size. Panel count scales with kWh, while inverters are sized for instantaneous watts and surge.
Panel Count by Common System Sizes (5 kVA, 10 kVA, etc.)
Solar systems are often advertised by inverter capacity (in kVA). kVA (kilovolt‑ampere) measures apparent power, while kW measures real power. Inverters have power factors (PF) between 0.8–1.0; a 5 kVA inverter at 0.8 PF delivers 4 kW of usable power.
| System size (Inverter capacity) | Approx. real power (kW) | Typical daily consumption (kWh) | Approx. panel count (350 W panels) | Notes |
| 3.5 kVA (≃2.8 kW) | 2.8 kW | 8–10 kWh/day | 6–8 panels | Suitable for basic home with fridge, fans, lights and TV. |
| 5 kVA (≃4 kW) | 4 kW | 12–15 kWh/day | 10–12 panels | Powers family home with pumps and small freezer. |
| 7.5 kVA (≃6 kW) | 6 kW | 18–22 kWh/day | 15–18 panels | Runs larger homes with multiple fridges/freezers and some AC. |
| 10 kVA (≃8 kW) | 8 kW | 25–30 kWh/day | 20–24 panels | Supports small office blocks or homes with several AC units. |
These estimates assume 5 peak sun hours and a 25 % loss factor. If you live in Lagos or Port Harcourt (4 – 5 sun hours), increase panel count by 15–20 %. Also consider roof space; standard 350 W panels measure about 1.6 m² each, so a 10 kVA system may need 30–40 m² of unobstructed roof area.
Don’t Forget Batteries: How Many Batteries for Overnight Power?
Batteries are the engine that keeps your lights on after sunset. They are rated in ampere‑hours (Ah) and voltage (V); multiplying both gives watt‑hours (Wh) and kilowatt‑hours (kWh). For example, a 12 V, 200 Ah battery stores 2.4 kWh (12 × 200 ÷ 1,000).
Depth of Discharge (DoD) and Battery Types
Depth of discharge measures how much of a battery’s capacity is used before it is recharged. Different batteries have different safe DoD limits:
- Lithium‑ion (LiFePO₄) batteries: Can handle 80–90 % DoD without damage[14]. They offer 3,000–7,000 cycles and high efficiency (~95 %)[16]. They cost more upfront but last longer and provide more usable energy.
- Lead‑acid (tubular/AGM) batteries: Should be discharged only to about 50 % DoD to maintain lifespan[14]. They typically offer 300–700 cycles[16] and require ventilation. Cheaper to purchase but need replacement every 2–4 years[17].
Autonomy and Sizing Formula
To size your battery bank, decide how many hours (or days) you want power without sunlight (autonomy).
Battery capacity (kWh) = (Daily energy consumption × Autonomy fraction) ÷ DoD
For example, a family consuming 10 kWh/day who wants 24‑hour autonomy will need about 10 kWh ÷ DoD of battery. With lithium (80 % DoD): ≈ 12.5 kWh; with lead‑acid (50 % DoD): 20 kWh. In regions with long rainy seasons, design for 1–2 days of autonomy (2–5 days for off‑grid installations)[18].
Inverter Sizing: What Size Inverter Do You Actually Need?
Inverters convert DC from panels/batteries to AC for your appliances. They must handle running watts (continuous load) and surge watts (starting load). Refrigerators, pumps and air conditioners require 2–3× their running power for a few seconds[8].
Steps to size an inverter:
- Sum the running wattage of all devices that may operate simultaneously. Include extra for future loads.
- Identify surge loads (fridge, pump, AC) and multiply their wattage by 3 to estimate surge demand.
- Choose an inverter with a continuous rating at least 25–30 % higher than your running load and a surge rating above your calculated peak. For example, a home with 2 kW running load and a 3 kW surge should opt for a 3 – 3.5 kVA inverter.
- Select a pure sine‑wave inverter to avoid damaging sensitive electronics like TVs and laptops[15]. Popular brands in Nigeria include Victron, Deye, Felicity, Solis and Growatt[19].
Remember: kVA ≠ kW. Multiply kVA by the inverter’s power factor (usually 0.8–1.0) to get kW.
Common Mistakes Nigerians Make When Sizing Solar (And How to Avoid Them)
A well‑designed solar system delivers decades of reliable power. The following pitfalls, drawn from installer experience and industry guides, can shorten lifespan or waste money:
- Inaccurate load calculation. Undersizing results from guessing appliance hours or forgetting “phantom loads” like decoders and chargers. Perform a thorough energy audit[10].
- Insufficient battery storage. A battery bank should provide 2–5 days of autonomy for off‑grid systems[18]. Undersized batteries cause frequent outages and shorten battery life.
- Choosing the wrong battery chemistry. Using lead‑acid batteries for heavy daily cycling reduces lifespan; lithium batteries offer deeper discharge and longer cycles[20].
- Ignoring panel orientation and shading. Even small shadows drastically reduce output[21]. Face panels south with an angle close to your latitude and ensure they are not shaded.
- Using undersized cables and skipping fuses/earthing. Thin wires overheat and waste energy[22]; neglecting overcurrent protection is a fire hazard[23]. Always insist on proper cabling and grounding[24].
- Mismatched components. Mixing voltage levels or using the wrong type of charge controller reduces efficiency[25].
- Buying counterfeit or low‑quality components. Counterfeit panels deliver only 10–15 % efficiency versus 20 %+ for genuine panels[26] and degrade quickly. Up to 40 % of solar components in Nigeria fail to meet international standards[27]. Substandard products can cause fires[28]. Purchase from reputable suppliers and ask for certifications.
- Skipping maintenance. Dust, bird droppings and loose connections reduce performance. Clean panels and inspect wiring periodically[29].
- No earthing or lightning protection. Proper grounding protects your system from surges and lightning[24]. Nigeria’s thunderstorms make this essential.
Checklist: What to Tell an Installer Before You Buy
Before hiring a solar installer, prepare this information to ensure an accurate quote:
- Daily energy consumption (kWh) from your load audit, including future appliances.
- Peak load (W) and surge load (e.g., pump, fridge) to size the inverter.
- Desired hours of autonomy (night only, 1 day, 2 days).
- Location and roof details: city/state (sun hours), roof orientation, available surface area and shading obstacles.
- Battery preference: lithium vs. lead‑acid; note that lithium lasts longer and supports deeper discharge.
- Budget range and financing needs; system size and quality components drive cost[30].
- Quality and warranty requirements: ask for Tier‑1 panels, pure sine‑wave inverter, copper cables and surge/earth protection. Avoid counterfeit products[31].
- Backup intentions: Will you keep a generator or PHCN connection? Hybrid systems reduce battery size but rely on grid availability.
FAQs: Solar Panel Calculation for 24/7 Power in Nigeria
Q: How many solar panels do I need to power a TV, fan, lights and a small fridge in Nigeria?
A basic home using a small refrigerator, one TV/decoder, three fans and LED lights consumes roughly 4–5 kWh/day (see Example A). With 20 % losses and 5 peak sun hours, you’d need about 4 × 350 W panels to cover daily consumption.
Q: Can solar power truly run 24/7 without PHCN or a generator?
Yes, but you must size your battery bank to supply power throughout the night and during cloudy days. Off‑grid systems usually include 2–5 days of battery storage[18]. Hybrid systems combine solar, batteries and grid/generator backup to reduce costs.
Q: What’s the difference between kVA and kW when sizing inverters?
kVA measures apparent power. Multiply by the power factor (typically 0.8–1.0) to get kW (usable power). For example, a 5 kVA inverter at 0.8 PF provides ≈4 kW of real power.
Q: How long do solar batteries last?
Lithium batteries typically last 3,000–7,000 cycles and support 80–90 % DoD[16]. Lead‑acid batteries last 300–700 cycles and should be discharged to only 50 % DoD[14], so they often need replacement every 2–4 years[17].
Q: Do I still need a generator after installing solar panels?
A well‑sized system with enough batteries can operate independently. However, many Nigerians keep a small generator as emergency backup during prolonged bad weather or when heavy loads (welders, ACs) exceed inverter capacity.
Q: How does the rainy season affect solar power in Nigeria?
Cloud cover reduces solar generation, especially in the south. When designing your system, use the lower end of the peak sun hour range (4–5 h) and add extra panels and battery capacity to maintain 24/7 power.
Q: What factors influence the cost of a 5 kVA solar system in Nigeria?
The cost depends on power capacity, battery type, quality of components, installation standards and energy habits[32]. Lithium batteries and Tier‑1 panels cost more but offer better ROI[33]. Avoid focusing solely on inverter rating; you must match panels and batteries to your daily kWh demand.
Q: Are lithium batteries worth the extra cost for Nigerian homes?
In most cases, yes. Lithium batteries provide longer lifespans, deeper discharge and higher efficiency[20]. While upfront costs are higher, they often deliver 40–60 % better lifetime return[34] and require less maintenance than tubular batteries.
Q: How do I spot fake solar panels?
Counterfeit panels often lack certification and deliver only 10–15 % efficiency compared with genuine panels’ 20 %+[26]. Buy from reputable suppliers, check for manufacturer’s serial numbers and insist on warranty documents. Government agencies have warned about substandard solar products flooding Nigeria and encourage certification[35].
Q: Is net‑metering available in Nigeria?
As of 2025, Nigeria’s Electricity Act 2023 opened the door for net‑metering, but implementation is limited. Most installations remain off‑grid or hybrid. Follow regulatory updates if you wish to sell excess power to the grid in the future.
Conclusion: Your Next Step to 24/7 Solar in Nigeria
Nigeria’s chronic electricity crisis and escalating generator costs are pushing homeowners and small businesses toward solar + inverter + battery systems. Sunlight is plentiful—northern regions receive 6–7 peak sun hours and even coastal states average 4–5 hours. To enjoy 24/7 power:
- Perform a detailed load audit to know your daily kWh usage.
- Use the simple sizing formula: Panel count = (Daily consumption × losses) ÷ (Panel power × sun hours).
- Account for losses and battery autonomy; oversize by 20–25 % and select batteries with appropriate DoD.
- Size your inverter for running and surge loads, and choose quality components to avoid failures.
- Avoid common mistakes: miscalculations, undersized batteries, fake panels, poor wiring, missing protection and neglecting maintenance.
Whether you’re powering a one‑room apartment, a family home or a small office, the principles remain the same—know your load, respect Nigeria’s sunlight patterns and invest in quality.
Ready to begin?
Conduct a load audit today and consult a reputable installer to design a system tailored to your needs. A properly sized solar system will free you from the noise of generators, protect you from fuel price hikes and let you shout “Up NEPA!” only as a nostalgic joke.