Introduction

Choosing the right solar system size is the MOST important step in powering your company with solar energy.
A system that is too small will:

❌ trip your inverter
❌ drain batteries fast
❌ damage equipment
❌ force generator use
❌ reduce productivity

But a properly sized commercial system:

✔ delivers 24/7 power
✔ reduces diesel cost
✔ supports heavy appliances
✔ increases productivity
✔ saves millions long-term

In this guide, Solarzone Nigeria explains how to calculate the perfect solar system size for your company — step by step.

⭐ 1️⃣ Step 1: List Out All Electrical Appliances Used Daily

Create a load list that includes:

• Office equipment

• Cooling systems

• Production machines

• Refrigeration

• AC units

• Computers

• POS systems

• Lighting

• Security gadgets

For each item, write:

✔ Wattage (W)
✔ Hours of use per day

⭐ 2️⃣ Step 2: Calculate Total Load (Wattage)

Add up the wattage of all appliances.

Example: Corporate Office

• 10 computers — 600W

• 2 printers — 180W

• AC units — 2,200W

• Lights — 300W

• Router/Network — 40W

• Security system — 80W

• Other devices — 200W

Total Load = 3,600W

This determines the minimum inverter size your company needs.

⭐ 3️⃣ Step 3: Determine Peak Load

Peak load is the highest amount of power used at the same time.

Example:

AC + Computers + Lights = 3.2kW peak

Your inverter must be larger than your peak load.

Recommended:

✔ Use inverter with at least 30–50% extra capacity

So for 3.2kW load → 5kVA inverter minimum.

Solarzone always sizes inverters with safety margin to avoid overload.

⭐ 4️⃣ Step 4: Calculate Total Daily Energy Consumption (kWh)

Formula:

Wattage × Hours of Use = Watt-hours

Divide by 1,000 to get kWh/day

Example:

• Computers: 600W × 8h = 4.8 kWh

• AC: 2,200W × 6h = 13.2 kWh

• Printer: 180W × 2h = 0.36 kWh

• Lights: 300W × 10h = 3 kWh

• Router: 40W × 24h = 0.96 kWh

Total Consumption = ~22 kWh/day

This is the MOST important figure when calculating solar panel and battery size.

⭐ 5️⃣ Step 5: Size the Solar Panel Array

Nigeria receives about 5 hours of good sunlight daily.

Formula:

Total Daily kWh ÷ 5 = Solar panel size needed (kW)

Example:

22 kWh ÷ 5 = 4.4 kW solar panels

This equals:
✔ 8 panels of 550W
or
✔ 10 panels of 450W

Solarzone Recommendation:

For businesses, we increase panel size by 20–30% to ensure:

• Rainy-season stability

• Faster charging

• 100% daytime load support

So recommended panel size = 5.5 – 6 kW

⭐ 6️⃣ Step 6: Size the Battery Bank (Lithium Recommended)

Battery capacity formula:

kWh needed × Backup hours ÷ Voltage = Ah

For a company needing 22 kWh/day and aiming for 12 hours backup:

Formula:
22,000Wh ÷ 48V ≈ 458Ah

This equals:
✔ Two 48V 200Ah lithium batteries
or
✔ Four 48V 100Ah lithium batteries

Why Lithium?

• Charges fast

• Lasts 8–12 years

• Supports AC

• Better for commercial loads

• No maintenance

Solarzone uses Felicity, Dyness, Blue Carbon, and Pylontech lithium batteries.

⭐ 7️⃣ Step 7: Choose the Right Inverter Size

Based on:
✔ peak load
✔ number of appliances
✔ type of business
✔ future load expansion

Inverter Size Guide for Companies:

• Small businesses: 3.5–5kVA

• Medium offices: 5–7.5kVA

• Hotels/restaurants: 10–15kVA

• Schools/hospitals: 10–20kVA

• Factories: 20–100kVA

Solarzone installs advanced hybrid inverters that support solar + PHCN + generator.

⭐ 8️⃣ Step 8: Determine If Your Company Needs a Hybrid System

Hybrid systems intelligently combine:
✔ Solar
✔ Batteries
✔ PHCN
✔ Generator

Benefits:

• Minimal generator use

• Zero power interruptions

• Seamless automation

• Stable voltage for sensitive equipment

Most businesses require hybrid systems for reliability.

⭐ 9️⃣ Step 9: Consider Future Growth

Your company may expand in 1–3 years.

Solarzone designs scalable systems so you can add:
✔ more panels
✔ more batteries
✔ larger inverter

…without replacing the entire system.

⭐ 10️⃣ Step 10: Get a Professional Energy Audit

A proper solar system for a company must be measured accurately.

Solarzone performs:

• Site inspection

• Load analysis

• Appliance evaluation

• Wiring assessment

• Roof/space analysis

• Solar direction check

This ensures 100% accurate sizing.

⭐ Why Companies Choose Solarzone for Solar Sizing & Installation

Solarzone provides:

⭐ Professional load calculations
⭐ Engineering-grade solar design
⭐ Battery and inverter optimization
⭐ Hybrid solar configurations
⭐ Commercial-grade lithium systems
⭐ Wiring upgrades
⭐ High-efficiency monocrystalline panels
⭐ After-sales servicing
⭐ Nationwide support

We design and install commercial solar systems that deliver real results.

🏁 Final Thoughts

Calculating the right solar system size is essential for a company that depends on reliable power.
A properly sized system will:

✔ Reduce diesel consumption
✔ Lower PHCN bills
✔ Protect appliances
✔ Increase productivity
✔ Prevent inverter trips
✔ Support your business growth

Let Solarzone Nigeria size and install the perfect solar system for your company.

💥 Call to Action

⚡ Need accurate solar sizing for your company?
Contact Solarzone Nigeria today for a full energy audit and commercial solar design.

📞 Call/WhatsApp: 09091394722