Save More With Solar Battery Storage: Retrofit Your Old Solar PV System

Fit Battery Storage to your Old Feed in Tariff Solar PV System.

If you had solar panels installed under the Feed-in Tariff (FiT) scheme, you’re already ahead of the game when it comes to renewable energy. But did you know you could be saving even more on your electricity bills?

By retrofitting battery storage to your existing solar PV system, you can store the free energy your roof generates instead of sending it back to the grid — and use it when you actually need it. At EV-PV Ltd, we make this upgrade simple, smart, and worthwhile.

What is 'Retro-Fitting' Battery Storage?

A battery retrofit means adding a solar battery (like the Tesla Powerwall or Sigenergy system) to an existing solar PV setup — even if it was installed years ago under the original FiT.

Your current system likely exports unused energy to the grid for a small return. With battery storage, you keep that energy instead — and use it in the evening, during peak times, or even in a power cut (with backup enabled).

Why Retrofit a Battery to Your FiT Solar System?

Many homeowners are surprised by how much solar energy they don’t use during the day. That excess energy is sent to the grid — often for pennies — and then you buy it back in the evening for three to four times the cost.

Here’s why battery storage retrofitting is a smart move:

✅ Keep More of Your Solar Energy

Store the energy you generate during the day and use it at night.

✅ Reduce Your Energy Bills

Avoid buying electricity during peak times when rates are highest.

✅ Stay on the Feed-in Tariff

Yes, you can still claim your FiT payments — even with a battery installed.

✅ Prepare for Energy Price Rises

Using your own stored energy helps shield you from market fluctuations.

✅ Easy Installation

Retrofitting a battery to your system is usually straightforward and doesn’t disrupt your existing FiT agreement.

Will I Still Receive My Feed-in Tariff Payments?

Yes. Retrofitting battery storage does not affect your FiT eligibility or payments. You’ll still receive your ‘feed in tariff rates as usual — and your export tariff too.

Most homeowners are on a deemed export rate, meaning they’re paid for around 50% of what they generate, regardless of how much they actually export. That means you’re free to store and use as much as you want — and still get paid the same.

Which Battery Systems Can Be Retrofitted?

At EV-PV Ltd, we install a range of high-performance battery storage systems suitable for retrofitting, including:

Tesla Powerwall 3 (AC Coupled only. PW 3 can’t be retro fit and keep your old feed in tariff’)
SolaX
Fox ESS
Sigenergy

We’ll assess your existing solar PV system and recommend the most compatible and cost-effective solution.

How Much Does a Battery Retrofit Cost?

The cost depends on the battery size, brand, and your system layout — but typical installs start from around £2,500 to £6,995 fully fitted.

We also offer systems with:

Backup capability (in case of power cuts)
Solar and grid charging options
Monitoring via mobile apps

You will also be eligible for 0% VAT on battery installations under current government schemes.

Start Saving More With EV-PV Ltd

If you’ve already invested in solar, retrofitting battery storage is the next step toward true energy independence. With electricity costs rising, now is the perfect time to take control of your energy usage and get more from your roof.

At EV-PV Ltd, we’ve helped hundreds of homeowners retrofit battery storage to existing solar systems — quickly, cleanly, and professionally.

👉 Get in touch today to request a quote or book a free home assessment.
Let us help you unlock the full potential of your solar PV system.

Home Battery Storage UK Without Solar - Is It Worth It?

You don’t need solar panels to benefit from a home battery storage system. In fact, more and more UK homeowners are choosing to install batteries on their own to take advantage of off-peak energy tariffs and boost energy resilience.

Here’s how it works:

Charge your battery overnight when electricity is cheaper (using tariffs like Octopus Go or Intelligent Octopus).
Use that stored energy during peak daytime hours when electricity is more expensive.
Reduce your reliance on the grid, and protect your home from power cuts (with backup options).

At EV-PV Ltd, we regularly install battery storage without solar for customers who want to save on bills, prepare for the future, or simply improve their home’s energy independence. It’s a smart choice — with or without panels.