Is battery storage without solar worth it for your business?
Business battery storage can operate without solar by charging from the grid and discharging later. UK Power Networks describes this use and warns that storage has energy losses [S1]. Test the tariff difference after losses and operating costs. Our assumed 90% efficiency is an illustration, not a product claim or a quoted return. Checked October 2026.
Can your business install battery storage without solar panels?
Yes. Solar is not the essential input for a grid-charged battery. UK Power Networks describes charging storage when demand and prices are lower, then discharging during higher-demand periods [S1]. For your site, the question is whether the available tariff difference covers losses, running costs and the investment.
Start with your business electricity contract and metered consumption. Mark when the site could charge and when stored electricity could replace more expensive imports. Do not borrow a household tariff from a forum and assume your business can obtain it. Ask your electricity supplier for the tariff and operating conditions in writing.
For the wider project budget, read business battery costs and battery tariff arbitrage.
How much could a battery earn or save without solar?
For behind-the-meter storage, the main value may be a reduced electricity bill rather than cash sales. Keep those descriptions separate. Here, “net benefit” means avoided import cost minus charging electricity and annual operating costs. It is not turnover from selling energy to drivers.
This is an illustration, not a quote. Every monetary input and performance value below is an assumption, not a market average or an installer offer. UK Power Networks confirms that storage is not fully efficient; the assumed efficiency below is not its product rating [S1].
| Assumed input | Value |
|---|---|
| Battery energy and inverter power | 100 kWh; 50 kW |
| Low / mid / high annual discharge | 10,000 / 20,000 / 30,000 kWh |
| Equivalent full discharges per year | 100 / 200 / 300 |
| Charging electricity | £0.12/kWh |
| Avoided daytime import | £0.30/kWh |
| Round-trip efficiency | 90%, including assumed conversion losses |
| Software and maintenance | £600/year |
| Installed capital cost | £20,000–£30,000 |
| fully funded / part funded host share | 20% / 70% of net benefit |
| part funded host capital contribution | 50% of installed cost |
Charger power, driver sessions and driver price are not applicable: this is a battery-only example. A “session” here is a charge/discharge cycle. Round-trip efficiency means delivered energy divided by charging energy over the same boundary. Ask whether standby and cooling loads are included in a real proposal.
The calculation is: annual delivered kWh × (£0.30 − £0.12 ÷ 0.90) − £600. That gives net annual benefit of £1,067 / £2,733 / £4,400 for low / mid / high use, rounded after calculation.
For the mid case, charging needs 20,000 ÷ 0.90 = 22,222 kWh. Avoided imports are worth £6,000; charging costs £2,667; software and maintenance cost £600. The difference is £2,733. Replace each assumption with your own data.
How do fully funded, part funded and self funded compare?
In fully funded storage, ask who pays for energy and who receives bill credits or market receipts. Unlike a charger host payment, a share of bill savings is not automatically a cash income paid to you. The table assumes a contract pays the stated host share after the same costs.
| Model and annual outcome | Low use | Mid use | High use |
|---|---|---|---|
| fully funded host income | £213 | £547 | £880 |
| part funded host net benefit | £747 | £1,913 | £3,080 |
| self funded host net benefit | £1,067 | £2,733 | £4,400 |
Simple return on investment (ROI) is annual host net benefit ÷ host capital × 100. Simple payback is host capital ÷ annual host net benefit. Capital ranges produce these ranges; both assume unchanged annual performance.
| Model and measure | Low use | Mid use | High use |
|---|---|---|---|
| part funded ROI | 5.0–7.5% | 12.8–19.1% | 20.5–30.8% |
| part funded payback, years | 13.4–20.1 | 5.2–7.8 | 3.2–4.9 |
| self funded ROI | 3.6–5.3% | 9.1–13.7% | 14.7–22.0% |
| self funded payback, years | 18.8–28.1 | 7.3–11.0 | 4.5–6.8 |
No grant, export payment, tax relief, financing, replacement or interruption benefit is included. Fixed operating costs are assumed; your quote must add any variable service fees. Compare the funding models using the same operating boundary.
What could make the payback calculation fail?
An attractive spread does not help if you cannot discharge during expensive periods. Check closed days, seasonal changes, battery reserve and power limits. Reduce annual discharge when the site cannot absorb it. Repeat the model using a narrower price spread and a higher charging price.
Ageing also matters. The SAM battery-life methodology distinguishes ageing with time from degradation caused by cycling and allows replacement costs in project cash flows [S3]. A long simple payback needs an annual model that changes capacity and includes replacement when required.
Read battery warranty and degradation. Do not assume a calendar warranty permits every operating pattern, or that a claim covers lost bill savings. Obtain the proposed dispatch profile and warranty terms together.
What grid and site checks are needed before you buy?
Ask the installer to confirm charging headroom and the permitted export arrangement. UK Power Networks assesses network requirements through its solar-and-storage connection process [S2]. Its route applies in its own area; your local network operator must confirm yours. No solar panels does not mean no connection assessment.
Request a cabinet location, maintenance access plan and assessment of noise and emergency access. Confirm planning requirements with the council where necessary. Ask your landlord and insurer about their conditions before the layout is fixed. Have your solicitor review access, removal, liability and exit provisions.
What should you send with an enquiry?
Bring your interval consumption data, tariff schedule, site plan and intended operating hours. Ask for the low-use case as well as the central case, and request an explanation of every proposed revenue stream. Check accounting and tax assumptions with your accountant.
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Common questions
Can you add solar after fitting a grid-charged battery?
Ask for the proposed future inverter and connection layout before buying. UK Power Networks provides a solar-and-storage application route and assesses network changes; adding equipment should be checked against the approved design [S2].
Is a flat electricity tariff enough for battery arbitrage?
With equal import prices, efficiency losses make the energy-shifting calculation negative before operating costs. Storage is not fully efficient [S1]. A different service or payment would need its own separately evidenced business case.
How do you calculate the break-even tariff spread?
For the assumptions here, delivered-energy cost is 12p ÷ 0.90 = 13.33p/kWh. At 20,000 delivered kWh, £600 running costs add 3p/kWh, giving a 16.33p break-even avoided tariff. These are assumptions; include losses because the network operator identifies them [S1].
Will a larger battery always earn more?
No. Recalculate usable discharge against actual demand during higher-price periods. Additional capacity left unused adds no displaced electricity in this method. Include ageing and replacement in a longer cash-flow model, as the SAM methodology allows [S3].
Should the calculation include export sales?
Only with a confirmed export agreement and tariff. UK Power Networks assesses the connection requirements for solar and storage [S2]. This example assumes no export income, so no unverified export rate supports the results.
What evidence should you request for efficiency?
Request whole-system imported and delivered energy at the proposed operating conditions, including auxiliary consumption. The network operator notes that batteries incur losses [S1]; our 90% assumption must be replaced with project evidence.
Ask about your site
Sources
- Energy storage and network losses, UK Power Networks,Last checked 16 October 2026
- Solar and storage at my business, UK Power Networks,Last checked 16 October 2026
- System Advisor Model: battery life, National Renewable Energy Laboratory,Last checked 16 October 2026