If you’re considering switching to solar, one of the first questions you’re probably asking is:

“How much will a solar system cost?”

The honest answer is that there isn’t one fixed price.

The cost of a solar installation depends on several factors, including the inverter capacity, battery size, solar panel capacity, type of battery, installation requirements, and the appliances you want to power.

A small system designed for essential loads will cost much less than a large system capable of powering multiple air conditioners, refrigerators, pumps, and other heavy appliances.

Let’s break it down.

What Determines the Cost of a Solar System?

A complete solar installation isn’t just an inverter and some panels. A properly designed system consists of several components working together.

1. Solar Inverter

The inverter is one of the most important parts of a solar system.

It converts the electricity stored in your batteries or generated by your solar panels into usable power for your appliances.

Common system sizes include:

• 3kVA
• 5kVA
• 7.5kVA
• 10kVA
• 15kVA
• 20kVA and above

The right inverter size depends on the total load you want to run.

For example, a household that only needs lights, TVs, fans, a refrigerator and other essential appliances will have different requirements from a home that wants to run several air conditioners.

2. Battery Capacity

The battery determines how much energy you can store and use when there is little or no sunlight.

You’ll commonly see battery capacities such as:

5kWh, 10kWh, 15kWh, 20kWh, 30kWh and more.

A larger battery generally means:

More stored energy → longer backup time → higher system cost

For example, a 10kWh battery can store twice as much energy as a 5kWh battery under the same nominal conditions.

However, battery capacity should not be chosen based on size alone. Your daily energy consumption and the loads you want to run should determine the appropriate battery size.

3. Solar Panels

Solar panels generate the electricity that charges your batteries and supplies your loads during the day.

The number of panels you need depends on:

• Your energy consumption
• Available sunlight
• Panel wattage
• Inverter/MPPT specifications
• Desired charging speed
• Available roof or installation space

For example, a system using 550W panels will require a different number of panels from one using 450W panels to achieve the same total solar capacity.

More panels generally mean a higher upfront cost, but they can also provide more energy during the day and recharge your batteries faster.

4. Battery Type

The type of battery you choose also affects the cost.

Lithium batteries

Lithium batteries are increasingly popular for solar installations because they generally offer:

• Longer cycle life
• Higher usable capacity
• Faster charging
• Lower maintenance
• Better depth of discharge

Tubular/lead-acid batteries

They can have a lower initial purchase price, but they typically require more maintenance and may have a shorter useful life depending on how they are used and maintained.

For many modern solar installations, lithium batteries are an attractive option because of their performance and long-term value.

5. Protection Equipment and Accessories

A professional solar installation also requires the appropriate protection and electrical accessories.

Depending on the system, these may include:

• DC breakers
• AC breakers
• Surge protection devices
• Isolators
• Fuses
• Cables and connectors
• Earthing
• Distribution equipment
• Mounting structures
• Changeover/bypass equipment

These components are important because a solar system should not simply be connected together without proper electrical protection.

6. Installation

Installation cost depends on the complexity and size of the project.

Factors that can affect installation include:

• Number of panels
• Roof or ground installation
• Distance between panels, inverter and batteries
• Cable routing
• Battery installation
• Electrical protection
• Earthing
• Existing electrical infrastructure

A larger installation naturally requires more work, materials and planning.

So, How Much Should You Budget?

Instead of focusing only on the price of a particular inverter or battery, think about the complete system.

For example:

Small solar system

Suitable for basic essential loads such as:

• Lights
• Fans
• TV
• Wi-Fi
• Small refrigerator

Medium solar system

Can support more appliances and longer backup, depending on the design.

Large solar system

Designed for higher energy consumption and may support loads such as:

• Multiple refrigerators/freezers
• Air conditioners
• Water pumps
• Washing machines
• Other heavy appliances

The cost can therefore vary significantly from one installation to another.

Why You Shouldn’t Choose a Solar System Based Only on Price

Two systems with the same inverter capacity can have completely different prices.

For example, a 5kVA system with a small battery will provide a very different experience from a 5kVA system with a larger lithium battery and more solar panels.

That’s why the cheapest quotation isn’t necessarily the best option.

A good solar system should be designed around:

Your appliances + your energy consumption + your desired backup time + your budget.

How to Choose the Right Solar System

Before buying a solar system, you should first determine:

1. What appliances do you want to power?

List everything you want to run.

2. How much power does each appliance consume?

Check the wattage or power rating of your appliances.

3. How long do you use them?

An appliance’s power consumption and operating time determine how much energy you need.

4. How long do you want your batteries to provide backup?

Someone who wants 4 hours of backup will have different requirements from someone who wants 10–12 hours.

5. Do you want to run heavy appliances?

Air conditioners, electric cookers, water heaters and pumps can significantly increase the required system size.

Get the Right Solar System for Your Needs

At Gotech Solar, we don’t believe in simply selling you an inverter and batteries.

We help you determine the right system based on your actual energy needs, appliances, budget and desired backup time.

From system design and product supply to professional installation and maintenance, we provide complete solar solutions for homes, businesses and other facilities across Nigeria.