Question 1

How much can I expect to save?

Accepted Answer

Most Vimma customers on a smart time-of-use tariff save between 40% and 55% on the electricity they would otherwise buy at peak rates. The actual figure depends on your consumption, your tariff's off-peak price, and how much of your usage you can shift to the charging window. Our Estimator gives you a personalised figure. Treat it as an indicative Estimate; your Survey and formal Quotation will refine it further. Actual savings will vary.

Question 2

Do I need a smart meter?

Accepted Answer

Yes. A smart meter is required to access a time-of-use tariff such as Octopus Go or E.ON Next Drive, which is how you charge the battery cheaply overnight. If you don't have one yet, your energy supplier will fit one free of charge.

Question 3

Do I need to change my electricity tariff?

Accepted Answer

To get the full benefit of a Vimma battery, yes. You'll need a time-of-use tariff with a cheap overnight window, typically 6p–9p/kWh off-peak versus 25p+ at peak.

Question 4

What if I am on a fixed tariff?

Accepted Answer

A fixed tariff charges the same rate all day, so there's no cheap window to exploit. The battery will still provide some resilience benefit (or self-consumption if you have solar), but you won’t make financial savings until you switch.

Question 5

Can I add it to my existing solar setup?

Accepted Answer

Yes. Vimma batteries have a hybrid inverter and support both AC-coupling (connecting alongside an existing solar inverter) and DC-coupling (integrating directly with a compatible solar array). DC-coupling is typically the preferred route unless you have micro-inverters or DC optimisers, since it’s more efficient than AC-coupling. We’ll determine your current setup and advise the best design configuration.

Question 6

Can I charge my car from it?

Accepted Answer

Not directly. If you want a dedicated EV charger, Vimma can supply and install one as part of your system. If you already have one, we can upgrade you to one which integrates into the ecosystem or advise you how to configure your existing charger to maximise savings.

Question 7

Can I pay monthly?

Accepted Answer

Affordable payment options are available. For details, make an enquiry after which we can refer you to our finance partner. No finance application is made on this website.

Question 8

Is charging it at night a fire risk?

Accepted Answer

No. Vimma batteries use Lithium Iron Phosphate (LFP) chemistry, the safest lithium battery type, with excellent thermal stability and no risk of thermal runaway under normal operating conditions. We typically install the battery externally or in a garage/out build (connected to the house), away from living spaces. Our installations are MCS-certified and carried out by qualified electrical engineers.

Question 9

Do you control the usage of my battery?

Accepted Answer

Yes. Vimma operates a managed service. Our platform optimises charging and discharging to maximise your savings automatically, with no action needed from you. Occasionally the battery may participate in grid-balancing services; revenue from this funds Vimma's 15-year workmanship warranty and helps reduce our installation cost. Full details are covered in our Contract of Sale.

Question 10

What if I move house?

Accepted Answer

The battery is a fixed installation and normally stays with the property; cheaper bills are a selling point! However, if you want to take it with you, no problem. Speak to us and we can give you a price for removal and reinstallation.

Question 11

What if I rent my home?

Accepted Answer

You would need your landlord's permission to install a battery system, as it involves minor electrical work. Some landlords are receptive, particularly where it improves the property's EPC rating. We can provide supporting information to help you make the case.

Question 12

What if the electricity company changes the tariff?

Accepted Answer

Tariff terms can change, and Vimma monitors the market continuously. If you change tariff or provider you can update the configuration in the user app, or we can do it for you. You are never locked in to a single tariff.

Question 13

Will you need to turn off my electricity supply?

Accepted Answer

Yes, briefly. The installation usually requires a short planned outage, typically under an hour, so we can connect the battery consumer unit safely. The installation team will agree a convenient time with you in advance.

Question 14

Do I need my internet router to be nearby?

Accepted Answer

The battery needs a Wi-Fi or wired internet connection to communicate with the Vimma platform. If your router isn't close to the installation point, a Wi-Fi extender or a powerline adapter will usually solve it.

Question 15

What if I change my internet provider?

Accepted Answer

Unless the internet connection has been hardwired (Ethernet), if you change your Wi-Fi settings you’ll need to update the credentials on the battery’s app. This is a straightforward step; Vimma support can walk you through it.

Question 16

Does it charge with green energy?

Accepted Answer

Overnight, the UK grid typically carries a higher proportion of renewable generation (wind, nuclear) than during peak daytime hours. Charging at night therefore tends to have a lower carbon intensity. You can also pair your battery with solar panels to store your own renewable generation directly.

Question 17

Do I need to add this to my home insurance?

Accepted Answer

Yes. Inform your home insurer that you have a battery system installed. Most insurers treat it similarly to other permanent home improvements.

Question 18

How long is the warranty?

Accepted Answer

Vimma installations are covered by a comprehensive 15-year workmanship warranty. The hardware carries a separate 15-year manufacturer warranty, for complete peace of mind.

Frequently Asked
Questions

Finance

Installation

Tariffs

Solar

EV Charger

Battery

Warranty

Still have a question?

Frequently Asked
Questions

Finance

Installation

Tariffs

Solar

EV Charger

Battery

Warranty

Still have a question?

Frequently AskedQuestions

Finance

Installation

Tariffs

Solar

EV Charger

Battery

Warranty

Still have a question?

Frequently AskedQuestions

Finance

Installation

Tariffs

Solar

EV Charger

Battery

Warranty

Still have a question?

Frequently Asked
Questions

Frequently Asked
Questions