Use-case TCO: 300 kWh farm BESS in the UK

Verdict: Do not hand. NPV = -£131,572; simple payback = none within the 10-year horizon; discounted payback = none within the 10-year horizon; LCOS = £0.3244/kWh. Equipment class: 300 kWh LFP containerised BESS (no specific OEM SKU is named on this page; the page is positioned as a generic screening tool, and any specific OEM model and manual revision must be confirmed at RFQ). Location: United Kingdom (GB grid; England & Wales distribution). Horizon: 10 years. Discount rate: 8.00%. Evidence date: 2026-09-22. Limitation: financial figures come from the scenario TCO model and are computed; the inputs that fed the model (CAPEX, OPEX, daily cycles, tariffs, degradation rates, charge and discharge value) are bounded model assumptions, not sourced facts.

1. Computed TCO summary

2. Computed year-by-year cash flow

The year-10 cost line of £36,000.00 reflects a bulk end-of-horizon replacement / decommission / EoL provision that the model recognises between year 9 and year 10; the underlying assumption is captured in section 4. Simple payback is reported as "—" and discounted payback as "—" because discounted cumulative net cash flow does not turn positive within the 10-year horizon given the CAPEX, OPEX and benefit schedule above.

3. Equipment reference (generic screening tool — no SKU evidenced)

This page is positioned as a generic screening tool for a 300 kWh LFP containerised BESS in a UK farm use case. No specific OEM product model, OEM installation manual or manual revision is named or asserted on this page. Torque, SOC window, DC and AC voltage limits, BMS thresholds and thermal management limits are deliberately omitted; they depend on the exact OEM manual revision, which must be named in the RFQ response and not invented here.

4. Inputs the scenario model used (bounded model assumptions, not sourced facts)

Every input in the table below is a bounded model assumption that fed the computed tables. None of these values is asserted as a sourced fact.

5. Duty & import pathway (lookup, not asserted)

Final duty and import treatment must be confirmed at the point of entry on the live tariff service; the entries below are HS subheading pointers only and the UK duty rate is not asserted as a fact on this page.

EU Battery Regulation Regulation (EU) 2023/1542 applies in the EU/EEA regardless of import pathway. Incoterms delivery terms are governed by ICC Incoterms 2020 (official rules page); freight documents for the shipment must align to FIATA terms (FIATA) and, if the cells are shipped by air, to the IATA Dangerous Goods Regulations (IATA DGR programme page).

6. Certifications block (no certificate verified)

7. UK market and price-reference signals (lookup only)

8. Risk & mitigation notes

• The computed NPV is negative across the 10-year horizon; simple and discounted payback are reported as "—". Treat the model as a screening tool, not a procurement recommendation.
• Tariff cannibalisation risk if national ToU differentials compress; monitor IEA publications for market signal — IEA.
• Rural GB grid constraints may require DNO (UK Power Networks, SSEN, NGED, NIE) reinforcement; request a G99 connection offer before CAPEX commitment.
• Turnkey classification: a skid containing cells, BMS and inverter must be classified using essential character and rules of origin; obtain a binding tariff ruling if the consignment value exceeds £5,000.
• End-of-life provision: the year-10 cost line of £36,000.00 is a bulk provision in the computed cashflow; the actual decommissioning or replacement trigger depends on the OEM manual revision (not named on this page) and the degradation curve observed in the field.

9. Citations table (every factual claim mapped to a source row)

10. Call to action

Request a fixed-scope RFQ for a 300 kWh farm BESS in the UK