Russell Andrews
A Fox ESS battery stores the electricity your solar panels make during the day so you can use it in the evening. At REST UK, we install Fox ESS batteries alongside our other battery options, and Fox ESS has invited us into its Premier Partner tier, its highest UK installer accreditation. If you would like to know which battery suits your home, fill in our form and our specialist team will advise.
What is Fox ESS?
Fox ESS makes home batteries and hybrid inverters. Its own website lists Battery and Hybrid Inverter as separate product ranges, and says more than 2 million batteries have been installed worldwide. In the UK, Fox ESS runs an accredited installer programme with several tiers, so you can check how a company is accredited before you choose.
At REST UK: we are in the top tier. Our guide to the Fox ESS Premier Partner accreditation explains what Fox ESS looks for and what it means for you.
What a Fox ESS battery does for your home
- Uses more of your own solar. Instead of exporting surplus electricity, you keep it for the evening.
- Works with smart tariffs. A battery can charge when electricity is cheaper and supply your home at busier times. Our guide to time-of-use tariffs and batteries shows how.
- Can be sized to your household. Battery capacity is matched to how much electricity you use and when.
- Is monitored through an app. You can see what your system is doing from your phone.
The Energy Saving Trust explains how a battery works with solar panels if you would like an independent overview.
Choosing the right size
The best battery is the one sized to your home. Our home battery size guide explains how daily use, solar capacity and tariffs all play a part.
At REST UK: we recommend a battery after looking at your electricity use, your solar system and your goals, and we explain the choice in writing. Our home battery storage page shows the options we offer, including Fox ESS, Duracell and Tesla Powerwall, so you can see what suits you.
Fox ESS and your solar panels
A battery and your solar panels work as a team. The panels make the electricity, the inverter manages it and the battery stores what you do not use straight away. Fox ESS makes both batteries and hybrid inverters, so the parts of a system can be chosen to work together.
At REST UK: we design the whole system around your home, so the panels, inverter and battery are chosen together rather than one at a time.
What installing a battery with REST UK looks like
Our process follows five steps: survey, design, install, commission and aftercare, which we describe on our how it works page. Your written quote sets out the equipment, and our own team carries out the installation across England and Wales.
- Survey: we look at your home and your electricity use.
- Design: we recommend a battery size and explain why.
- Install: our team fits the system.
- Commission and aftercare: we set it up, show you the app and stay in touch.
Warranty and registration
Fox ESS runs a warranty registration portal, so registering a system matters. The terms depend on the product, so we always set them out in your written quote.
At REST UK: our specialist team can explain how registration and warranty support work for your system. Fill in our form or ask the chatbot on our contact page and we will give you a direct answer.
Have a question we have not covered? Fill in our form and our specialist team will give you a direct answer, or ask our chatbot on the contact page.
Why homeowners choose REST UK
We are MCS certified for solar PV, protected through HIES, and registered with the FCA as a credit broker (FCA 824643). Our own team surveys, designs and installs every system across England and Wales, and REST UK is rated 4.3/5 on Trustpilot from more than 721 reviews. Our accreditations page lists each certificate so you can check it yourself.
Product details vary by model and change over time. Information was checked on 5 November 2026, so please rely on the model and terms confirmed in your written quote.