Shift cheap-rate electricity
Use your demand pattern and actual tariff windows to estimate the electricity that needs storing. Include charging and discharge losses. A cheap unit rate alone cannot establish the saving or financial return.
Battery storage · Cornwall & Devon
Battery storage.
Size it for the job you need.
A battery for daily tariff shifting can recharge each day. For outage cover, size it around the equipment that must keep running and how long it needs power.
Energetika provides independent battery storage advice, design and installation from Millbrook, Cornwall. We work on domestic, commercial and agricultural sites in Cornwall and Devon; send your postcode so we can confirm coverage.
Estimate your battery capacity →
Coverage is confirmed before arranging a visit.
- 01 / Daily shifting
Charge, use, recharge
Store cheaper grid electricity or solar surplus for later. A grid-shifting battery can recharge each day.
- 02 / Capacity
Count the energy in kWh
Choose the useful energy needed between charging opportunities, allowing for usable limits and losses.
- 03 / Power
Check the output in kW
The inverter and supply must handle the loads and charging schedule, including simultaneous demand.
A grid-connected battery does not automatically supply your site in an outage. Backup needs compatible equipment and a designed installation.
The design comes first
A design with its assumptions in view.
Store a surplus that actually exists
We check existing PV equipment, generation and demand before selecting AC- or DC-coupled storage. A larger battery is not useful if there is too little surplus or insufficient charging time to fill it.
kW and kWh answer different questions
kWh describes stored energy; kW describes how fast the system can charge or supply a load. Heat-pump starting behaviour, cooking, EV charging and other simultaneous loads need their own power assessment.
Find a safe, suitable location
Siting must consider the equipment, temperature, access, clearances, escape routes, structure and electrical protection. Cable routes, supply capacity and applicable safety and network requirements shape the final design.
From enquiry to operation
Know what happens next.
What you send
Send a postcode, your goals, recent electricity bills and details of existing equipment. Photos or plans are useful if available.
What we agree
We confirm coverage and discuss what needs investigation. Survey or design scope and any fees are agreed before proceeding.
What you review
Assess the layout, equipment, connection requirements, estimated performance and associated works before deciding.
What we hand over
The agreed work includes settings and operation. The proposal sets out documentation, warranties and ongoing support.
Choose the operating purpose
Daily shifting or several days of backup?
For daily grid shifting, size the battery around demand outside the cheap-rate window. It can recharge tomorrow; its capacity is not multiplied by every day you intend to operate it.
During an outage, each day adds energy demand without a guaranteed recharge. Starting charge, reserved capacity and winter heating can make the requirement much larger. Our planner assumes no solar replenishment during the outage.
Backup requires compatible islanding equipment, safe isolation and a decision about which circuits stay live. A capacity calculation cannot prove that an inverter can run your heat pump or whole building.
Warm Homes finance
Compare lender routes as well as rates. Confirm installer choice, full costs and funding before committing; finance through Energetika has not been confirmed.
Scheme guide & lender comparison → · Compare finance with cash →
Scheme outline and checks before committing
The government’s Warm Homes Loan Scheme offers eligible homeowners a way to spread the cost of improvements such as heat pumps, solar panels and battery storage through participating lenders. Products, interest rates and terms vary, and applications are subject to lender eligibility, credit and affordability checks.
Read the official scheme guidance and check the available products with a participating lender. We are preparing information about the scheme; finance through Energetika has not been confirmed.
Can you keep your chosen installer?
Check this before comparing headline rates. Lenders use different application routes: some require an approved installer or a particular proposal platform. MCS certification alone does not establish access to every lender. If independent installer choice is not clearly confirmed, ask the lender before committing to work.
Compare the full installation price and total loan repayments together, including fees, any security over your home, early repayment charges and when funds are released. A lower interest rate does not by itself establish a lower overall project cost. See the official participating lender list.
Scheme information checked 1 November 2026. This is not a finance offer or an eligibility decision.
Before you decide
Questions worth asking.
Can I have a battery without solar panels?
Yes, a suitable system can charge from the grid. Its usefulness depends on your tariff, demand, supply capacity and charging controls. Losses and installed cost need to be included in any financial assessment.
Will a battery keep my heat pump running in a power cut?
Only if the backup arrangement can supply the heat pump and its associated equipment, with enough starting and continuous power as well as stored energy. Many installations do not provide outage supply.
What does EESS mean?
Electrical energy storage system. For a battery installation, the system includes the batteries, power conversion equipment, controls and protection; the battery capacity is only one part.
Is a planner result an equipment recommendation?
No. The planner compares energy requirements using your assumptions. Detailed design still needs load data, equipment ratings, safety and network checks, and an agreed installation scope.
Based in Millbrook, Cornwall
Tell us what you want storage to do.
Please include your postcode, electricity use, existing PV, tariff and whether you want daily savings, selected-circuit backup or a wider resilience assessment.
We confirm feasibility and scope before recommending equipment.
Enquire about battery storageEnergetika Ltd
Unit 12, Gallows Park
Millbrook, Cornwall, PL11 3AX
Unit 12, Gallows Park
Millbrook, Cornwall, PL11 3AX
01752 987 726
info@energetika.co.uk
Domestic, commercial and agricultural sites in Cornwall and Devon. Coverage is confirmed from your postcode.