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But it adds cost, and the case varies depending on your usage pattern. Here's the honest analysis.", "image": "https://alliantenergy.co.uk/assets/commercial-solar-DydTBMj7.jpg", "author": { "@type": "Person", "name": "Alliant Energy Team", "url": "https://alliantenergy.co.uk/about" }, "reviewedBy": { "@type": "Person", "name": "MCS Registered Engineer", "jobTitle": "MCS Registered Engineer" }, "publisher": { "@type": "Organization", "name": "Alliant Energy", "url": "https://alliantenergy.co.uk", "logo": { "@type": "ImageObject", "url": "https://alliantenergy.co.uk/logo.png" } }, "datePublished": "2026-01-15", "dateModified": "2026-05-19" }, { "@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [ { "@type": "Question", "name": "What is Triad avoidance and how much can it save?", "acceptedAnswer": { "@type": "Answer", "text": "Triads are the three half-hour periods of highest grid demand between November and February, at least 10 days apart. Eligible businesses pay a premium for electricity drawn during these periods. A battery discharging during likely Triads can save £5,000–£30,000/year for eligible businesses." } }, { "@type": "Question", "name": "Can we get battery storage without solar?", "acceptedAnswer": { "@type": "Answer", "text": "Yes — standalone commercial batteries (charged from grid overnight, discharged peak) are viable on strong time-of-use tariffs. Payback is typically longer than solar + battery combined, but upfront cost is lower." } }, { "@type": "Question", "name": "How long does a commercial battery last?", "acceptedAnswer": { "@type": "Answer", "text": "Typically 10-year warranties with capacity guarantees (usually 80% of original). In commercial duty-cycling scenarios, batteries often last 12–15+ years in practice." } } ] } ] --- [![Alliant Energy — Renewable Energy Solutions](/__l5e/assets-v1/3bd22195-cc6e-43e6-b5ff-5a808ce292d3/alliantenergyltd-2.svg)](/) [Home](/)[About](/about-us) [Services](/services) [Guides](/guides)[Case Studies](/case-study)[![Levelise](/__l5e/assets-v1/59fd362e-361a-47d7-ad1f-65e9beeb5289/levelise-logo.webp)](/guides/levelise-hub-explained) [01282 501589](tel:01282501589)[Get a Quote →](/quote) Spoke guide · Commercial # Commercial Solar + Battery Storage: Is It Worth Adding? For most commercial solar installations, battery storage is the upgrade that makes a good system significantly better. But it adds cost, and the case varies depending on your usage pattern. Here's the honest analysis. By **Alliant Energy Team**· reviewed by MCS Registered Engineer Last updated 19 May 2026 [Get a Commercial Quote](/quote) [Battery Storage](/services/battery-storage) On this page - [Why commercial battery](#why) - [What it costs](#cost) - [When it adds value](#value) - [Real example](#example) - [Battery-ready](#ready) - [FAQ](#faq) Ready to act? Free quote in one working day. [Get a Quote →](/quote) Commercial electricity pricing is more complex than domestic — half-hourly metering, demand charges, time-of-use rates, Triad avoidance. Battery storage interacts with all of these. ## Why commercial battery storage matters more than domestic - Demand charge avoidance: some commercial tariffs include a demand charge based on peak consumption. A battery reduces peak draws — sometimes saving more than the energy cost itself. - Time-of-use arbitrage: charge from cheap overnight or midday solar; discharge during expensive peak-rate periods (typically 4–7pm). - Triad avoidance: for Triad-exposed businesses, battery discharge during the three highest-demand half-hours of winter can save thousands per year. - Extended self-consumption: store surplus daytime solar for evening use. ## What commercial battery storage costs Battery capacity Typical installed cost Best for 50–100 kWh £40,000–£80,000 Small-medium commercial, demand charge reduction 100–250 kWh £80,000–£200,000 Medium industrial, time-of-use arbitrage 250–500 kWh £200,000–£400,000 Large industrial, Triad avoidance Tax relief Commercial battery storage qualifies for Full Expensing alongside solar — 100% first-year relief for companies on 25% corp tax. A £100,000 battery effectively costs £75,000 after tax. ## When battery adds the most value - Time-of-use tariffs with significant peak vs off-peak differential - Demand charges on your supply contract - Significant evening electricity use not covered by solar generation - EV fleet charging — batteries handle overnight fleet charging cheaply - Triad risk where savings justify system cost The case is weaker when you're on a flat-rate tariff with little peak/off-peak differential, when almost all your use is during solar generation hours, or when you have a small system with limited surplus. ### See the battery business case for your site Modelled against your half-hourly data and tariff. [Get a Quote](/quote) [Battery Storage](/services/battery-storage) ## Real example: solar + battery at a distribution depot A logistics depot running 6am–10pm installs 200kWp solar and a 150kWh battery. During the day, solar covers 70% of operations. The battery stores lunchtime surplus for the 5–9pm peak rate period. - Annual solar saving (self-consumed): ~£45,000 - Battery peak-shifting saving: ~£12,000 - Total annual saving: ~£57,000 - Combined system cost: ~£280,000 - After Full Expensing (25% tax): effective cost £210,000 - Payback: approximately 3.7 years Standalone vs combined Battery alone adds ~£12,000/year saving at ~£90,000 (after Full Expensing) — a 7.5-year standalone payback. Combined with solar, the overall payback is well under 4 years. ## Battery-ready vs battery-included Where immediate battery payback is marginal, a battery-ready installation is an option. A hybrid inverter with battery connections is fitted at solar installation, so a battery can be added later without replacing the inverter. The significant cost saving vs retrofitting later is in not having to change the inverter. ## Frequently asked questions ### What is Triad avoidance and how much can it save? Triads are the three half-hour periods of highest grid demand between November and February, at least 10 days apart. Eligible businesses pay a premium for electricity drawn during these periods. A battery discharging during likely Triads can save £5,000–£30,000/year for eligible businesses. ### Can we get battery storage without solar? Yes — standalone commercial batteries (charged from grid overnight, discharged peak) are viable on strong time-of-use tariffs. Payback is typically longer than solar + battery combined, but upfront cost is lower. ### How long does a commercial battery last? Typically 10-year warranties with capacity guarantees (usually 80% of original). In commercial duty-cycling scenarios, batteries often last 12–15+ years in practice. [![Try our finance calculator — finance available from 0% APR representative with Phoenix Financial Consultants](/__l5e/assets-v1/0f6760a3-7021-4f9c-9ac4-5fcfe2f13ab2/phoenix-finance-banner.png)](https://www.phoenix-fc.co.uk/finance_landing?b=6598B6E5D7AE4889&t=F3DE58AC104F449DB37376B9) Three ways to get started ## Ready to find out what solar saves you? Get a tailored quote in one working day. No obligation. No hard sell. Speak to a renewable energy engineer — not a salesperson — at a time that suits you. [Get a Quote → ](/quote) [Request a Callback →](/request-callback) [Download Brochure →](/brochure) Accreditations ## Certified, registered, and insured. Every time. MCS certification isn't a box-ticking exercise — it qualifies your system for Smart Export Guarantee payments and government grants. Our installers are also NICEIC-approved and TrustMark-registered, and every install is fully insured. ![Citation ISO Certification: ISO 9001 quality management, ISO 14001 environmental management and ISO 45001 occupational health and safety](/__l5e/assets-v1/180183cd-e6fd-4b0a-984c-83e6a41390d7/accreditations-iso.jpg) ![Alliant Energy — Renewable Energy Solutions](/assets/logo-IFrgP5Dc.png) Renewable energy & energy-saving specialists. MCS-registered solar PV, battery storage, heat pumps and EV charging across the UK. #### Quick Links - [Home](/) - [About Us](/about-us) - [Services](/services) - [Case Studies](/case-study) - [Areas We Cover](/solar-panel-quotes-north-west) - [Contact](/contact) - [Privacy Policy](/privacy) - [Terms & Conditions](/terms) #### Services - [Solar for Homes](/services/solar) - [Commercial Solar](/services/commercial-solar) - [Battery Storage](/services/battery-storage) - [Air Source Heat Pumps](/services/heat-pumps) - [EV Charging](/services/ev-charging) - [Energy Saving Advice](/services/energy-saving-advice) #### Contact - [01282 501589](tel:01282501589) - [info@alliantenergy.co.uk](mailto:info@alliantenergy.co.uk) - Unit 214 Northlight Industries, Pendle Road, Brierfield, Nelson BB9 5FL [Get a Quote](/quote)[Brochure](/brochure) Alliant Energy Ltd is an Introducer Appointed Representative (Financial Services Register No. 1020779) of Phoenix Financial Consultants Limited (Phoenix). 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