Frequently Asked Questions

Yes. We can arrange the disconnection, transport, and reinstallation of your system at your new property, and we will provide a clear cost estimate in advance. Alternatively, many customers choose to include the system as part of their home sale, an increasingly attractive feature for buyers, and commission a fresh installation at their new address.

ESME is built for the long term. Every system is warranted for 10 years or 6,000 charge cycles, whichever comes first. Based on real-world performance to date, we expect most systems to remain operational for up to 20 years.

Batteries don't fail suddenly, they gradually reduce in capacity over time, meaning your system will continue to deliver meaningful savings long after the warranty period ends.

Yes, if you tell us whilst we carry out your home visit we can ensure your batteries will save any surplus energy your solar panels create for use at night.

Yes. If you let us know during your home survey, we will configure your ESME system to capture any surplus energy your solar panels generate and store it for use later, rather than exporting it back to the grid at a lower rate.

No. ESME works with or without solar panels.

Without solar, it charges automatically during off-peak periods when grid electricity is at its cheapest, then discharges during peak-price hours, significantly reducing your bills through smart time-of-use tariffs.

With solar, it stores the energy your panels generate during the day for use in the evening, maximising your self-sufficiency and reducing your reliance on the grid entirely.

Either way, ESME is designed to pay for itself over time.

Solar is expensive to purchase and install. It needs space facing the sun. Power generated varies considerably depending on the time of year and weather. In most case the return on investment can be more than 10 years. ESME’s batteries will start saving you money from the day they installed, and with a return on the investment in most cases being around five years. Batteries are not weather dependant.

Last year the UK government spent £500M turning off renewables and using gas powered power stations. This is because often renewable energy is created when it is not needed, for instance in the middle of the night. Being able to store electricity allows more of that energy to be harnessed and used at peak times rather than rely on turning on the dirty energy power stations.

Most installations are completed within a single day. Straightforward setups, such as a garage or external wall installation, typically take 4–8 hours. More complex configurations, including integration with an existing solar system or an electrical upgrade, may require additional time.

Every installation is carried out by our own qualified, certified engineers, with full system testing and commissioning completed before we leave.

Yes. ESME batteries use LiFePO4 (lithium iron phosphate) chemistry, the most stable and thermally resilient technology available for home energy storage. Unlike older lithium-ion chemistries, LiFePO4 is specifically engineered to resist overheating and is widely regarded as the gold standard for residential use.

Every ESME unit includes a built-in Battery Management System (BMS) that continuously monitors temperature, voltage, and performance, with automatic shutdown protection if any parameter falls outside safe limits.

Concerns about fire risk are understandable, but battery fires in domestic systems are extremely rare, research indicates failure rates as low as 1 in 40 million cells. Because ESME designs and installs its own system end-to-end, we have full control over quality, siting, ventilation, and protection from day one.

Yes. ESME can provide backup power during a grid outage, though some additional electrical work may be required depending on your property. This is something our engineers will assess and advise on during your survey.

No. While you can pay in full, we also offer a finance option through our lending partner, allowing you to spread the cost with a monthly direct debit until the balance is cleared. This will include the cost of borrowing. We can provide a full breakdown, including any deposit you choose to pay, as part of your personalised quote. You can also choose to pay no deposit at all.

Yes. Once installation is complete, everything, the inverter, batteries, and cabling, belongs to you outright. If you have chosen to finance the installation, your ownership commitment to the finance provider will remain until the balance is settled, but the system is yours from day one.

If a fault develops within the first two years of installation, we will replace the affected components at no cost to you. For issues arising after two years but within your warranty period, we will arrange repair or replacement as appropriate.

Your first point of contact for any concern will always be ESME directly, there is no third-party installer to navigate.

It is technically possible to use an EV's battery to perform a similar function. However, there are practical limitations worth considering: your car must be at home and connected to be of use, and if you have drawn on its charge to power your home, it may not have sufficient range for your next journey. Additionally, using an EV battery in this way may accelerate its degradation, a costly consideration given the value of the asset. For most households, a dedicated home battery system is the more reliable and cost-effective solution.

Unlike many installers who fit third-party hardware, ESME is our own product, designed, supplied, and installed by us. That means a single point of accountability for the unit, the installation, and your ongoing support. There's no ambiguity about who to call if you need help, and no risk of incompatibility between components sourced from different manufacturers.

Our engineers know ESME inside out, because it's the only system they work with.

For the majority of UK households, yes, and increasingly so. Rising electricity prices and the growth of smart tariffs have made battery storage one of the most effective ways to take control of your energy costs. Whether you're looking to reduce bills, maximise solar output, or gain greater energy independence, ESME is designed to deliver a strong, long-term return.