Introduction

Correct solar sizing is the most important step in reducing your monthly electricity bill and ensuring your solar system performs efficiently.

Incorrect sizing leads to:
❌ Fast draining batteries
❌ Slow charging
❌ Higher NEPA bills
❌ Inverter overload
❌ Frequent breakdowns

But the good news?
With proper system sizing, your solar setup will:

✔ Charge fast
✔ Last all day and night
✔ Reduce PHCN dependency
✔ Save up to 60–70% on monthly energy costs

In this guide, Solarzone Nigeria teaches you how to size your solar system correctly based on your home’s real power needs.

⭐ 1️⃣ Step One: Calculate Your Daily Energy Load

List all essential appliances and their wattage.

Example Load for a 3-Bedroom Home:

Total Load:

➡ 620W

This tells you the minimum output your inverter must handle.

⭐ 2️⃣ Step Two: Determine Your Daily Energy Usage (kWh)

Multiply wattage × hours used daily.

Example:

620W load × 10 hours daily = 6.2kWh per day

This is your daily energy requirement.

⭐ 3️⃣ Step Three: Choose the Right Inverter Size

Your inverter must be able to handle the highest possible load.

Inverter Size Guide:

• 2-bedroom: 2.5kVA – 3.5kVA

• 3-bedroom: 3.5kVA – 5kVA

• 4-bedroom: 5kVA – 7.5kVA

• Business: 5kVA – 10kVA+

Formula:

Total load (W) ÷ Power factor (0.8)

Example:
620W ÷ 0.8 = 775VA

Always add room for surge loads → 3.5kVA recommended

Solarzone ensures accurate inverter sizing to prevent overload.

⭐ 4️⃣ Step Four: Calculate Battery Size

Battery sizing depends on:

✔ Your daily usage
✔ Backup hours
✔ Battery type (lithium or tubular)

Formula:

Battery Ah = (Load × Hours) ÷ Battery Voltage

Example (using 24V system):

620W × 10 hours = 6200Wh
6200 ÷ 24V = 258Ah needed

Round up → 2 × 200Ah batteries
Or one 48V 100Ah lithium for better performance.

Lithium batteries are highly recommended by Solarzone because:

• Charge faster

• Last longer

• Store more energy

• Perform better during rainy season

⭐ 5️⃣ Step Five: Calculate Solar Panel Capacity

Your panels must generate enough power to charge your batteries AND power your appliances during the day.

Formula:

Daily Load ÷ Average Sun Hours (5 hours)

Example:
6200Wh ÷ 5 hours = 1.24kW of solar

Round up due to inefficiencies:
➡ Install 6 × 450W panels = 2.7kW

This ensures full charging even in cloudy weather.

⭐ 6️⃣ Step Six: Choose the Right Charge Controller

Using a PWM controller will reduce efficiency.

MPPT Size Rule:

Solar panel wattage ÷ system voltage

Example:
2700W ÷ 48V = 56A → Use 60A MPPT

Larger systems may require 80A or 100A MPPT.

Solarzone installs high-efficiency MPPT to maximize energy harvest.

⭐ 7️⃣ Step Seven: Consider Future Expansion

Always size your system with growth in mind.

Think about future additions:
✔ Extra fridge
✔ AC
✔ Extra fans
✔ More gadgets
✔ New appliances

Solarzone designs systems with room for expansion.

⭐ 8️⃣ Common Mistakes Homeowners Make When Sizing Solar Systems

Avoid:

❌ Adding too few panels
❌ Buying an inverter that's too small
❌ Using old or high-watt appliances
❌ Using PWM controllers
❌ Poor wiring
❌ Mixing old and new batteries
❌ Solar without energy audit

These mistakes increase your electricity bills and reduce solar efficiency.

⭐ Sample Solar System Sizes by Home Type

⭐ 2-Bedroom

• 3.5kVA inverter

• 2 × 200Ah batteries

• 6 × 450W panels

⭐ 3-Bedroom

• 5kVA inverter

• 1 × 48V 150Ah lithium

• 8–10 × 450W panels

⭐ 4-Bedroom

• 7.5kVA inverter

• 48V 200Ah lithium

• 12–14 × 450W panels

Solarzone customizes systems for your exact needs.

🛠️ Why Choose Solarzone for Solar System Sizing?

Solarzone offers:

⭐ Free solar energy audit
⭐ Accurate load calculation
⭐ Proper system sizing
⭐ Professional installation
⭐ Genuine solar components
⭐ Lithium/tubular battery solutions
⭐ MPPT optimization
⭐ Long-term maintenance

We design systems that reduce monthly energy cost — NOT increase it.

🏁 Final Thoughts

Correct sizing is the secret to a powerful, efficient, and cost-saving solar system.
Whether you want to reduce your NEPA bill or eliminate generator costs, proper sizing ensures you achieve maximum savings.

Let Solarzone Nigeria design the perfect solar system for your home or business.

💥 Call to Action

⚡ Want the right solar size for your home or office?
Contact Solarzone Nigeria today for load assessment, sizing, and installation.

📞 Call/WhatsApp: 09091394722