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What is a Solar iBoost and How Can It Save You Money?

If you have solar panels on your roof, you're already doing a fantastic job of generating your own clean electricity. But are you making the most of every sunbeam? We often chat with homeowners who love their solar setup but wonder if there's a way to squeeze even more value from it. The answer is a resounding yes, and one of our favourite ways to do this is with a clever device called a Solar iBoost.

A Mixergy hot water cylinder with Solar iBoost installed

You've made a wonderful investment in renewable energy, and we want to help you see the best possible return. This post will walk you through what a Solar iBoost is, how it works its magic, and the real-world benefits it can bring to your home and your wallet. We'll explore how this smart technology helps you use your free solar power instead of sending it back to the grid for a fraction of what it's worth.


Unlocking the Power of Your Surplus Solar Energy

So, what exactly is a Solar iBoost?

Imagine this: it's a bright, sunny afternoon. Your solar panels are working hard, generating more electricity than your home is currently using. Your TV is off, the washing machine has finished its cycle, and you're out in the garden. All that extra, unused electricity has to go somewhere. Typically, it gets automatically exported back to the national grid.

While that sounds good, the price you get paid for exporting energy (through the Smart Export Guarantee or SEG) is usually much lower than the price you pay to buy it back from the grid later. This is where the Solar iBoost steps in.

A Solar iBoost is a smart device that monitors the flow of electricity in your home. When it detects that you're about to export surplus solar energy to the grid, it automatically diverts that free power to your hot water tank's immersion heater. In simple terms, it uses your excess solar energy to give you free hot water.


How Does the Solar iBoost Work?

The technology is brilliantly simple yet incredibly effective. It works in three straightforward steps:

  1. It Measures: A small sensor, or clamp, is attached to your home's main electricity cable. This sensor continuously measures whether electricity is flowing into your home from the grid or flowing out from your solar panels.

  2. It Detects: The iBoost system constantly analyses the information from the sensor. As soon as it detects that you are generating more power than you are consuming, it knows that surplus energy is available.

  3. It Diverts: Instead of letting that valuable energy escape to the grid, the iBoost sends it directly to your immersion heater. It cleverly adjusts the amount of power it sends, ensuring it only ever uses the truly spare electricity. This process happens automatically throughout the day, without you needing to do a thing.

Think of it as your home’s personal energy manager, always on the lookout for an opportunity to save you money and put your solar generation to good use.


The Real-World Benefits of a Solar iBoost

Understanding how it works is one thing, but seeing how it helps you is what truly matters. We’ve seen firsthand the difference this simple device can make for our customers. Here are the key benefits you can expect.

1. Significantly Reduce Your Energy Bills

This is the benefit that gets everyone excited, and for good reason. Heating water is one of the most energy-intensive jobs in any household. By using free, self-generated solar power to do this, you drastically reduce the amount of gas or grid electricity you need to buy.

Let's look at the numbers. In the UK, the cost of buying a unit (kWh) of electricity can be more than three times the average rate you get for exporting it. Every unit of electricity your iBoost uses to heat water is a unit you don't have to buy from your supplier at a premium price. Over the course of a year, especially during the sunnier months, these savings add up to a significant amount. We often hear from customers that their iBoost has paid for itself much faster than they expected.

2. Maximise Your Solar Investment

You invested in solar panels to become more energy-independent and reduce your costs. A Solar iBoost helps you achieve that goal more completely. It ensures that the primary beneficiary of your solar panels is you, not the grid.

A common scenario we encounter is with homeowners who are out at work during the day when their panels are most productive. Without a system like an iBoost, much of that valuable daytime generation would be exported for a low return. When they get home in the evening, they then have to pay to import electricity for cooking, lighting, and heating water.

The iBoost bridges this gap. It effectively stores your daytime solar energy in the form of hot water, ready for you to use in the evening for showers, baths, or washing up. It’s a practical way to "store" your energy without needing a large battery system.

3. Live a Greener, More Sustainable Lifestyle

For many people, choosing solar is about more than just money; it’s a commitment to protecting our planet. A Solar iBoost enhances your home's green credentials by increasing your self-consumption of renewable energy.

By using the power you generate on-site, you are reducing your reliance on the national grid, which still depends heavily on fossil fuels. Every kilowatt of solar power you use at home is one less kilowatt that needs to be generated centrally. It’s a small but powerful way to lower your carbon footprint and contribute to a more sustainable future. It’s a wonderful feeling to know that the hot water for your evening bath was heated entirely by the sun.


Is a Solar iBoost Right for Your Home?

A Solar iBoost is an excellent addition for almost any homeowner with a solar PV system and a conventional hot water cylinder with an immersion heater. It's particularly beneficial if:

  • You have a hot water tank: The system is designed to work with immersion heaters, so it's a perfect match for homes with cylinders (like a Mixergy tank) rather than combi boilers.

  • You're often out during the day: If your home is empty on sunny days, an iBoost ensures your solar generation doesn't go to waste.

  • You want to maximise savings: If your goal is to get the best possible financial return from your solar panels, an iBoost is one of the most cost-effective ways to do it.


Your Next Step Towards Smarter Energy Use

A Solar iBoost is a simple, affordable, and highly effective way to upgrade your solar PV system. It puts you firmly in control, making sure your home uses the clean energy it produces to its full potential. You get to enjoy lower bills, a faster return on your solar investment, and the satisfaction of living a little more sustainably.

We believe in empowering our customers to make informed choices about their energy. We hope this guide has helped you understand how this brilliant device can work for you.


If you have any questions or would like to discuss whether a Solar iBoost is the right fit for your home, please don't hesitate to get in touch.

We’re always here to help you on your journey to a smarter, greener home.

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