Battery storage case studies for business
Worked models that show how the payback is built for different demand profiles. These are anonymised, illustrative scenarios, not named clients, so the numbers show the method rather than dress it up.
300 kW / 600 kWh peak-shaving battery at a Yorkshire food producer
A chilled-food manufacturer on a two-shift profile with a sharp weekday late-afternoon demand peak sitting squarely in the red DUoS band, plus a 250 kW rooftop solar array exporting surplus at midday. Annual electricity bill £480,000, with non-commodity charges a growing share. The finance director wanted a payback built from the site's own half-hourly data after a previous inflated quote.
- System
- 300 kW / 600 kWh LFP behind-the-meter battery integrated with the existing 250 kW PV
- Annual saving
- £82,000 (red-band DUoS avoidance, capacity-charge reduction, lifted solar self-consumption)
- Payback
- 6.1 years
- Outcome
- Solar self-consumption lifted from 49% to 83%. Red-band import cut by around 85% on peak days. The full model was built from twelve months of half-hourly data and handed to the FD to stress-test. Frequency-response income was left out entirely as unmodelled upside.
150 kW / 300 kWh demand-charge battery at a Midlands engineering site
A precision-engineering business on a half-hourly meter paying steep availability and capacity charges on an agreed supply capacity it kept breaching during morning start-up spikes. No solar. Annual bill £210,000, of which non-commodity charges were nearly half.
- System
- 150 kW / 300 kWh LFP battery, standalone (no solar)
- Annual saving
- £34,000 (capped peak let agreed capacity be renegotiated down, plus red-band DUoS avoidance)
- Payback
- 6.8 years
- Outcome
- The measured site peak was capped so agreed capacity (kVA) could be cut, turning a volatile charge into a controlled one. Proof that the battery pays back without solar where the demand profile is spiky. Model built from the site's HH data, not an estimate.
100 kW / 200 kWh resilience-plus-arbitrage battery for a cold-storage depot
A chilled-distribution site where a grid outage risks stock loss running into tens of thousands of pounds, currently reliant on an ageing diesel standby. A 24/7 refrigeration baseload plus a 150 kW PV array.
- System
- 100 kW / 200 kWh LFP battery with islanding for the refrigeration critical load
- Annual saving
- £27,000/yr (solar self-consumption plus off-peak arbitrage) plus avoided diesel standby cost and de-risked stock loss
- Payback
- 7.4 years
- Outcome
- Seamless ride-through of grid outages for refrigeration; diesel standby retired as primary backup. Daily arbitrage and lifted solar self-consumption fund the system between outages. Designed to BS EN 62933 / 62619 with the insurer engaged up front.
Figures are illustrative worked models, not claimed results from named clients. Your number is built from your own half-hourly meter data.
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