Commercial battery storage myths vs facts
| Myth | The fact | Verdict |
|---|---|---|
| Lithium batteries are a serious fire hazard on a commercial site. | Correctly specified modern systems use LFP cells and are governed by BS EN 62619, BS EN/IEC 62933 and PAS 63100:2024, with detection, thermal monitoring and separation. The risk lies in cheap, non-compliant kit — which we do not install. This is a genuine concern, handled by design, not a reason to avoid storage. | Concede + handle |
| A battery pays back in 3-4 years — the numbers are amazing. | Inflated. Honest behind-the-meter payback in 2026 is typically 6-8 years, faster only where red-band DUoS exposure or solar surplus is high. Anyone quoting 3-4 years is leaning on optimistic grid-services income that has become volatile and saturated. We model from your half-hourly data and treat frequency-response income as upside, not the case. | Discredit inflated claim |
| Installing is quick — a few weeks and you are done. | The install is 1-6 weeks, but the programme is set by the DNO: a G99 study and connection can run 3-18 months. We submit G99 at survey and use G100 limitation to connect on constrained networks, but no honest installer can promise a fast go-live without the DNO position. | Myth |
| Commercial battery storage gets 0% VAT like home batteries. | No. The 0% VAT relief applies only to residential accommodation and relevant-charitable buildings, and reverts to 5% on 1 April 2027. General commercial premises do not qualify — the commercial route is capital allowances (100% AIA then 50% first-year allowance), not zero-rated VAT. | Myth |
| You need a big new grid connection to install a battery. | Often the opposite. A behind-the-meter battery with a G100 export/import limitation scheme lets you add load within your existing agreed capacity, avoiding or deferring a costly reinforcement. The battery is frequently the route around a constraint, not a victim of it. | Myth |
| Any electrical contractor can install a commercial battery. | Partly true, partly not. Many can wire the kit; far fewer can deliver the G99 application, G100 protection design, PAS 63100 fire siting, half-hourly metering and witnessed commissioning. Ask to see a commissioning pack and a fire risk assessment from a comparable job. | Concede + clarify |
We would rather under-promise and deliver. If you have heard a claim about commercial battery storage that sounds too good — a two-year payback, a same-month install, zero-rated VAT on a factory — check it against your half-hourly data and your DNO position before you commit. Read our honest view on whether it is worth it.