Solar Power Calculator

Everything You Need To Know About Solar Power Costs

The pressure on the electricity grid in South Africa is enormous and many people are turning to alternative solutions to make up for the shortfall. Solar power is one of the most common solutions to our power challenge and clients find using a solar array calculator a good starting point.

Solar power is a clean, renewable source of energy that can help you save money on your electricity bill and reduce your carbon footprint. The most common questions people ask before investing in a solar power system is: How do I calculate solar panel sizes and wattage and how much will a system cost?

We’ve developed an online solar calculator that can help you estimate the size and cost of a renewable energy system tailored to your requirements. The solar requirement calculator gives you an idea of how much money you’ll save with a solar system for your home or business.

Our solar calculator is easy to use. All you have to do is enter information about your monthly electricity bill, how much you want to save, and how many hours you want your battery to run. The solar output calculator will then give you an estimate based on this information.

The solar cost calculator will give you a rundown of the information we need to estimate the size and cost of your solar energy system below.

Is your home single-phase or three-phase?:

If you are unsure, use single-phase

Monthly Electricity Bill:

Monthly Bill to kWh conversion:

Approximate percentage of monthly bill you would like to save:

Required KWh Savings Per Month:

How many hours of energy autonomy would you like?:

In other words, how many hours would you like to be able to run off of batteries?

Required battery kWh:

System Cost:

Size of Panel Array:

Battery Bank Capacity:

Payback Period:

Monthly Estimated Savings:

DISCLAIMER: This is a rough estimate as equipment prices regularly fluctuate. Get in touch with our team for up-to-date prices.

Payback Period

How the Solar Savings Calculator works

The Solar Savings Calculator is an online tool that helps you estimate the size, cost, and potential savings of a photovoltaic (PV) solar system for your home or business. 

It considers several key factors, including:

  • Your energy usage: The solar system sizing calculator uses your monthly electricity bill to determine the appropriate size and capacity of the solar system you need to offset a significant portion of your electricity bill.
  • The cost of solar panels and equipment: The solar calculator online factors in the current cost of solar panels and associated equipment. This is particularly important because continuing advancements in solar power production have increased the adoption of solar power. 

The combination of factors allow the Solar Savings Calculator to estimate the overall costs and potential savings that a solar system tailored to your specific circumstances provides. 

The information from the solar panel wattage calculator can help you make informed decisions regarding the adoption of solar power while considering your energy usage, the cost of equipment, and the potential financial incentives available.


  • Single-phase: This is the most common type of electrical service in homes. It uses two wires, one for the live wire and one for the neutral wire.
  • Three-phase: This type of electrical service is used predominantly in commercial and industrial settings or larger homes. It uses four wires, one for each phase and a neutral wire.

Your electricity bill contains a lot of the information you need to complete the form, including, how much electricity you use each month. 

This information is important for the solar calculator because it will help to determine the size of the PV solar system you need.

If you don’t have your current monthly electricity bill, you can estimate your usage by looking at past utility bills.

You can also conduct a home energy audit to get a more accurate calculation of your energy usage. Although you can conduct the audit yourself, South Africa has several companies with professional installers who can do it for you.

Information regarding the number of kilowatt-hours (kWh) is essential to the calculation. 

  • A kilowatt-hour (kWh) is a unit of energy that is equal to one kilowatt of power used for one hour.
  • To convert your monthly electricity bill to kWh, divide the total cost of your bill by the price per kWh.
  • The price per kWh is usually listed on your utility bill.

Our solar system calculator has a function that estimates the number of kilowatt-hours (kWh) used per month based on your electricity bill’s amount .

This feature of our solar solution calculator allows you to choose the percentage of your monthly bill you would like to save.

For example, if you enter 50%, the solar calculator will estimate the size of the solar system you’ll need to cut your monthly electricity bill in half.

Click here to learn how financing your solar installation is as easy as buying a car.

This is how long you would like to be able to run your home on inverter battery power during a power outage or periods of loadshedding.

For example, if you enter 24, the solar calculator will estimate the size of the system you need for 24 hours of battery backup.

Our solar system calculator has a function that estimates the number of kilowatt-hours (kWh) of battery storage required along with the hours of autonomy.

Are you concerned about fake vrs real Solar Panels? Click here to learn how to protect yourself against counterfeits.

The solar calculator provides estimates on five aspects that are crucial to the energy production of all solar systems.

For example, if you enter 24, the solar calculator will estimate the size of the system you need for 24 hours of battery backup.

Our solar system calculator has a function that estimates the number of kilowatt-hours (kWh) of battery storage required along with the hours of autonomy.

1) Cost: This is the total cost estimate based on the numbers generated for the different components.

2) Size of panel array: The solar calculator determines the number of solar PV panels required to meet your needs.

3) Battery bank capacity: This refers to the battery capacity needed to power your home for your desired hours of autonomy.

4) Payback period: This is the time it takes for your solar system to pay for itself; for example, it will take 25 years of solar power generation for the savings from your system to equal the total system cost. 

5) Monthly estimated savings: This is the money that will come off your electricity bill every month averaged over a year.

Do you need financing for your dream solar installation? Click here for financing with MFC, a division of Nedbank.

Disclaimer: The solar calculator is a rough estimate and the actual cost and savings of a solar system may vary. Please contact us for advice regarding your solar energy requirements. We can give you a more accurate estimate based on your requirements and exact specifications.


  • Beat loadshedding: Solar power can help you beat loadshedding by providing you with a backup source of electricity. This is especially important if you live in areas with more frequent blackouts. 
  • Save money: Solar power can save you money on your electricity bill. The amount of money you save will depend on the size of your solar system and your energy usage. In some cases, you may be able to save enough money to offset the cost of your solar system in just a few years. 
  • Reduce your carbon footprint: Solar power is a clean and renewable source of energy. By going solar, you can reduce your carbon footprint and help the environment. Solar power does not produce any emissions, which can help to improve air quality and reduce greenhouse gas emissions.

If you are interested in learning more about solar power, and asking the question, “How much solar panels can save me?”, please contact us. We would be happy to answer any questions you have and help you get started on your journey to solar power.

Frequently Asked Questions:

Here are some of the questions we’re most often asked, along the with the advice necessary to help you decide that solar power energy is the answer you’re looking for.

  • The solar calculator provides estimates that are based on various factors and assumptions. While it gives a good indication of the cost and savings of a solar system, it’s important to note that the actual figures may vary depending on individual circumstances. For a more accurate assessment, we recommend reaching out to us directly and not relying solely on the figures given by the solar production calculator.

Yes, the solar calculator allows you to specify whether your home or business has single-phase or three-phase electrical service. This information is crucial for our solar calculator to determine the appropriate size and cost of the solar system for your specific needs.

 In the event that you don’t have your current monthly electricity bill readily available, there are alternative methods to estimate your energy usage. You can refer to your past utility bills to gauge your consumption, or consider hiring solar panel installers to conduct a home energy audit for a more precise evaluation. You can use the solar financing calculator to help get a rough estimate of what you might be looking at in terms of costs and savings for varying solar system sizes.

The solar calculator is a tool that takes into account your desired number of hours of energy autonomy during a power outage or periods of loadshedding. Based on this input, it estimates the necessary kilowatt-hours (kWh) of battery storage to meet your requirements.

The payback period varies depending on several factors, including the size of the solar system, the cost of components like solar panels and equipment, and the amount of money saved annually. Our online solar power calculator factors in the Kwh, the required inverter size, and the number of PV panels to figure out the solar system size.
Generally, the payback period represents the time it takes to recoup the initial investment through energy savings.

Why Choose AWPower

AWPower is one of the top solar installation companies in Cape Town, South Africa, that specialise in the industrial, mechanical, and mechatronic aspects required to develop high-quality, high-performing energy efficient solar power systems.

Our dedication to ongoing research and development ensures that we are always on the cutting edge of solar technology to design bespoke solar power systems that are well-known for their high standard of excellence.

"Knowledgable, helpful staff greatly facilitated our choice of an inverter. Competent, tidy installation. Back-up service, while we familiarised ourselves with unit function, was excellent. The system has worked flawlessly to date."

Janet Tooke Google Review

"I can highly recommend AWPower for solar installations. They give competitive prices and provide excellent workmanship. They installed an 8kw system for me with 2x100Ah batteries and 15 solar panels. They have been around since 2015 and know what they were talking about... not like many pop-up solar installers."

Frans Snyders Google Review

"Fantastic service from a professional team. I have been in contact with AWPower for a number of years now and their service has been excellent! The most recent project was installing a hybrid solar system at my residence. I was kept updated throughout the design, costing and inventory ordering process and installation took less than 2 days. The team are always available to attend to my queries and can adjust my system remotely to cater for changing requirements caused by higher levels of loadshedding. I highly recommend AWPower."

Ruchir Severaj Google Review

"We have been delighted with the professionalism and competence of the AWPower team in all phases of our somewhat complex project with them. Their proposals were professional and technically excellent, their interface with us equally so and they have kept us abreast of all and any issues as they developed as well as being on-site when they said. We chose a company that was stable, reliable, has been in the market for a good time and could deliver what they said. We have not been disappointed."

Ian Cook Google Review
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