How to Calculate Savings and Costs with Our Solar Calculator?

Joe Brennan
May 7, 2025

Thinking about going solar but unsure of the costs and savings? At Going Solar, we’ve made it simple to get a personalised estimate in just a few clicks.

In this guide, we’ll show you how to calculate savings and costs with our solar calculator so you can see what solar could really do for your home or business.

What is a Solar Calculator?

A solar calculator is a simple yet powerful tool that gives you an estimate of how much you could save by switching to solar energy.

By taking key information about your home, energy usage, and roof potential, it calculates the size of the solar system you’ll need and how much you could save on your energy bills.

Now that you know what a solar calculator is, let’s look into how you can easily calculate your savings and costs with the Going Solar Solar Calculator.

How to Calculate Your Savings and Costs with Going Solar’s Solar Calculator?

Calculating your solar savings and costs is effortless with Going Solar’s user-friendly Solar Calculator.

It’s designed to give you accurate results quickly, with no complicated steps involved. Here’s how it works:

Step 1: Choose Your House Type

Start by selecting your house type. Your house’s type plays a crucial role in determining your solar potential, as different types have varying roof sizes, orientations, and shading. Here are the options:

  • Terraced House
  • Semi-Detached House
  • Detached House

For example, detached homes usually have more roof space, which provides more room for installing solar panels. Terraced homes, on the other hand, typically have smaller roofs and therefore fewer panels.

By selecting your house type, we can better estimate how much sunlight your roof will receive and how many panels can be installed.

Step 2: Specify the Year Your House Was Built

Next, we’ll ask you to choose whether your home was built Pre-2021 or Post-2021. This detail helps us refine the solar recommendations based on energy efficiency standards:

  • Post-2021 homes typically meet higher energy efficiency standards, meaning they might need a smaller solar system to meet their energy needs.
  • Pre-2021 homes often consume more electricity, making them ideal candidates for larger solar systems that maximise savings.

This step ensures that the solar system is tailored to your home’s energy needs.

Step 3: Estimate Your Monthly Electricity Bill

Your current electricity usage plays a significant role in calculating how much you’ll save with solar. Choose your monthly electricity spend from the following options:

  • Less than €200
  • €200–€300
  • More than €300

The more you’re currently spending, the more you stand to save with solar. 

Here’s how it works:

  • The calculator estimates the size of the solar system you’ll need based on your electricity usage.
  • It then calculates how much of your electricity bill solar could cover.
  • Finally, it shows your potential savings both monthly and annually.

For example, if you’re spending over €300 a month, switching to solar could significantly reduce your energy bills, especially as energy prices continue to rise.

Step 4: Identify Your Peak Energy Usage Times

Now, we’ll ask about when you use the most energy. The options are:

  • Mornings
  • Evenings
  • Night Time
  • All Day

Why is this important?

Solar panels generate the most energy during daylight hours, especially between late morning and early afternoon. If you use energy during these times, you’ll be able to maximise your solar power usage.

However, if your energy consumption peaks in the evenings or at night, the calculator may suggest adding battery storage to store excess solar energy for later use.

This helps reduce your reliance on the grid and ensures your solar setup is perfectly suited to your energy habits.

Step 5: Share Your Contact Details

Once your potential savings and system size have been estimated, it’s time to provide a few details like your name, email, phone number, and Eircode so we can send you a personalised quote and offer expert guidance.

This information allows us to:

  • Send you a tailored quote or arrange a callback.
  • Offer expert advice based on your home’s energy needs.
  • Keep you informed about available grants, incentives, and special offers that could help reduce your solar installation costs.

Rest assured, your information is kept secure and is only used to assist you in making the best decision for your solar journey.

Why Use the Going Solar Calculator?

Here’s why Going Solar’s Solar Calculator is the perfect tool for you:

1. Accurate & Personalised: 

Get customised results based on your home or business.

2. Quick & Easy: 

Complete the process in just a few minutes.

3. No Obligation: 

It’s a no-pressure tool for you to explore at your own pace.

Ready to Start Saving on Your Energy Bills?

Don’t wait to start saving on your energy bills. Whether you're just exploring or ready to install, the Going Solar Calculator gives you instant, personalised insights—no guesswork, no hassle.

Try it now and see how much you could save. Got questions? Call us today, and our expert team is ready to guide you every step of the way.
Make the smart move. Go solar with confidence.

Conclusion

Now that you know how to calculate savings and costs with our solar calculator, why not give it a go? In just a few clicks, you’ll get a clear picture of your potential savings and what solar could do for your home or business.

Try the Going Solar Calculator today and start your journey to lower energy bills and a greener future.

Planning a switch to solar energy?

Contact Going Solar now and Get Free Advice & Quote Within Minutes!
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Frequently Asked Questions

How accurate is the Going Solar Calculator?

The Going Solar Calculator provides highly accurate estimates based on the information you provide, such as your house type, energy usage, and roof potential. While it’s not a final quote, it offers a reliable starting point for understanding your potential savings and system size.

Do I need to commit to anything after using the calculator?

No, there’s absolutely no obligation. The calculator is a free tool for you to explore your solar options at your own pace. If you’re happy with the estimate, you can choose to get in touch with our team for a personalised quote.

Will the calculator tell me if I’m eligible for solar grants?

While the calculator doesn’t directly assess grant eligibility, once you submit your details, our team can inform you about available SEAI grants and incentives that may apply to your solar installation.

What if I don’t know my exact electricity bill amount?

No problem! You can select an estimated range (e.g., “€200–€300”), and the calculator will provide an accurate projection based on that range.

Does the calculator take battery storage into account?

Yes, if your energy usage peaks in the evenings or at night, the calculator may recommend adding battery storage to help store excess solar energy for later use, reducing your reliance on the grid.

How long does it take to use the solar calculator?

The calculator is designed to be quick and user-friendly. It only takes a few minutes to complete the process and get clear insights into your potential savings and solar setup.

Contact Going Solar Now!

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Fill out the form below to book a free consultation with one of our experts and also receive a no-obligation quote.

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*FYI, parts of this blog post were drafted by artificial technlogy. But rest assured, it's been thoroughly researched, edited, reviewed and me & my team.
Author Fahad Zahid
Founder @ Going Solar

Joe Brennan, the founder of Going Solar, is dedicated to making solar power mainstream in Ireland and meet SEAI objectives. With a focus on affordability and sustainability, he is bringing renewable energy solutions to homes, reducing costs & environmental impact.