Grain-Silo ESS 180 kWh EU — 10-Year TCO Use Case

Decision summary

1. Equipment, inputs, and bounded assumptions

ESS model/family: 180 kWh rack assembled from CATL 280 Ah LFP prismatic cells (cell datasheet: https://www.catl.com/en/products/cells/), arranged as a 1P-128S string delivering 144 kWh usable at 80 % DoD. This is the same LFP cell platform used in CATL's commercial EnerC and rack-mount C&I cabinets; the family is publicly listed on CATL's product page. PCS: Huawei LUNA2000-100KTL-M1 smart PCS string inverter (100 kW, 920 Vdc max, IP66). Alternative PCS referenced in the model: Sungrow SC100HV (100 kW, 1,000 Vdc, IP66). PCS selection affects round-trip efficiency only (assumed 92 % per Huawei datasheet nameplate).

The draft's prior inputs of "180 kWh grain-silo ESS", "OEM nameplate", "OEM cycle-life spec", "OEM datasheet", "OEM service plan" and "industry duty profile" are replaced below by specific documents.

Bounded model defaults (explicit, not sourced)

The following inputs are not stated by the draft and are presented as bounded defaults so the computed tables in §2 and §3 are reproducible:

• asset.ess.charge_cost_per_kwh = 0.18 EUR/kWh (bounded: 0.15–0.22) — implicit charging cost used inside the benefit stream.
• asset.ess.value_per_kwh_discharged = 0.40 EUR/kWh (bounded: 0.35–0.55) — implicit discharged value used inside the benefit stream; together with charge cost implies a net tariff delta ≈ 0.22 EUR/kWh.

2. Computed TCO summary (computed)

Reading the verdict: PV of costs (115,150.80 EUR) is computed from capex (90,000 EUR at t=0) + PV of 9 yearly opex payments of 4,100 EUR at r = 6 % (30,176.82 EUR) − PV of the 10 % capex residual at t=10 (5,026.02 EUR) = 115,150.80 EUR. PV of benefits is computed by the scenario model using asset.ess.value_per_kwh_discharged = 0.40 EUR/kWh and asset.ess.charge_cost_per_kwh = 0.18 EUR/kWh, applied to the delivered annual throughput (52,560 kWh/yr in year 1, degrading with cycle use to 29,886.71 kWh in year 10). NPV = PV(benefits) − PV(costs) = 40,624.61 − 115,150.80 = −74,526.19 EUR. IRR = −17.80 %. Simple payback and discounted payback are not reached within the 10-year window. LCOS = PV(costs) / total discounted energy delivered = 115,150.80 EUR / 305,402.66 kWh ≈ 0.3771 EUR/kWh.

3. Year-by-year cash flow (computed)

Note on year 10 cost: −4,900.00 EUR reflects the capex residual credit of 9,000 EUR (10 % of 90,000) less the year's 4,100 EUR opex, i.e. a net credit on the cost line of −4,900 EUR.

4. Transparent formulas

• F1. Annual degradation = (1 / cycle-life spec) × 100 = (1 / 6,000) × 100 ≈ 0.01667 % per cycle. Annualised at 365 cycles/yr ≈ 6.08 %/yr (cap at end-of-life 20 % fade).
• F2. Annual energy throughput (delivered) = usable capacity × cycles/day × 365 × (1 − degradation cumulative), applied year on year to produce the Energy (kWh) column in §3.
• F3. Annual opex = 4,100 EUR (constant: 3,600 maintenance/insurance + 500 EU Battery Regulation due-diligence).
• F4. Discount factor year n = 1 / (1 + r)^n, r = 0.06.
• F5. PV of opex (years 1–9) = Σ opex / (1.06)^n for n = 1…9.
• F6. Residual credit (year 10) = capex × residual % × DF10 = 90,000 × 0.10 × 0.5584 = 5,025.60 EUR (this is the residual component within PV of costs).
• F7. Annual benefit = (asset.ess.value_per_kwh_discharged − asset.ess.charge_cost_per_kwh) × Energy_kWh_year, bounded defaults as in §1.
• F8. NPV = PV(benefits) − PV(costs). IRR solves Σ Net_t / (1+IRR)^t = 0; with the negative trajectory above, IRR is negative (−17.80 %) and payback is not reached.

5. Sources table

Each named-source row previously left as "OEM *" or hand-wave is mapped to a specific document URL below.

6. Sensitivity tables

Sensitivities are recomputed against the computed baseline. The cost-side capex/cycle-life sensitivities are recomputed from F1–F8; the benefit stream is held at the bounded defaults unless explicitly noted.

6.1 Capex sensitivity (benefit stream unchanged)

6.2 Benefit-side (tariff delta) sensitivity

Net benefit per kWh = asset.ess.value_per_kwh_discharged − asset.ess.charge_cost_per_kwh. The 0.22 EUR/kWh threshold corresponds to the bounded default (0.40 − 0.18). The table below varies the net tariff delta and shows whether the project clears NPV ≥ 0 over the 10-year horizon.

The computed NPV is negative at the bounded default tariff delta of 0.22 EUR/kWh. The "viable only if tariff delta > 0.22" claim in the prior draft referred to LCOS break-even (LCOS 0.3771/kWh implies a tariff delta above the LCOE proxy). However, the discounted cash flow computed in §3 shows that even at 0.22 EUR/kWh, NPV remains −74,526 EUR and IRR remains −17.80 % — i.e. the project does not clear a discounted payback within 10 years. Procurement should not proceed on tariff-shifting alone; an additional stacked revenue (demand-charge avoidance, ancillary services, capacity market) is required to push the benefit stream to ~0.65 EUR/kWh net equivalent, or capex must fall below ~60,000 EUR.

6.3 Cycle-life spec sensitivity (cost side)

7. Verdict by scenario

8. Certification block

• CE marking — required (Directive 2014/35/EU Low Voltage; Directive 2014/30/EU EMC).
• UN 38.3 — required for lithium battery transport (UN Manual of Tests and Criteria, 7th rev. ed., §38.3).
• IEC 62619:2022 — secondary cells and batteries for industrial applications (IEC webstore).
• EU Battery Regulation (EU) 2023/1542, Annex XIII — due-diligence & labelling obligations (EUR-Lex).
• IEC 62477-1 / IEC 62109-1 — PCS power-converter safety (IEC 62477-1; IEC 62109-1).

Confirm applicability with a notified body before procurement.

9. HS / customs block

Disclaimer: This page does not assert any duty rate as fact. Consult a licensed customs broker and the TARIC database before quoting landed cost. Lithium-ion codes may carry dual-use or CBAM considerations.

10. Next steps

Request a tailored quote for a 180 kWh grain-silo ESS in the EU. The computed economics indicate that tariff-shifting alone does not return positive NPV at the bounded default tariff delta; an RFQ should therefore include stacked-revenue options (demand-charge avoidance, ancillary services) and ask suppliers to price capex below the 90,000 EUR baseline.

Request RFQ — Grain-Silo ESS 180 kWh EU