Verdict (answer-first)
NPV = −21,631.31 EUR; discounted payback = none within the 15-year horizon; simple payback = 11.93 years; LCOS = 0.2503 EUR/kWh. Equipment: 150 kWh LFP cabinet (model family Sungrow ST5015KU-class LFP outdoor cabinet) paired with a Sungrow SG125HT 125 kW hybrid PCS. Location: EU (DE/ES/IT orchard mix). Horizon: 15 years. Discount rate: 8.00%. Evidence date: 2026-01-15. Limitation: financial figures are computed for the bounded default scenario only (single-cycle-day, peak-shift arbitrage, no capacity-market stacking); real-world revenues on a fruit-farm site will depend on contracted peak-tariff window and seasonal cold-room duty.
| Metric | Value | Reading |
|---|---|---|
| NPV (EUR) | −21,631.31 | Negative; case does not clear an 8% hurdle on discounted terms |
| Simple payback (years) | 11.93 | Inside the 15-year horizon but late |
| Discounted payback (years) | — | Does not occur within horizon |
| IRR | 0.0252 | Below the 8% discount rate |
| LCOS (EUR/kWh) | 0.2503 | 0.28 EUR/kWh peak tariff gives a thin margin |
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1. Use-case framing
An EU orchard operator running seasonal cold-storage rooms for fruit plus a pressurised irrigation pump array needs a behind-the-meter battery energy storage system (BESS) that covers two distinct loads: (a) a 40 kW cold-storage compressor cluster that draws during afternoon peak tariffs, and (b) a 22 kW variable-frequency drive pump bank that must ride through grid sags during summer storms. A 150 kWh nameplate LFP cabinet paired with a 125 kW hybrid inverter (de-rated to 60 kW continuous for the orchard profile) meets the daily energy envelope (cold-storage ~110 kWh/day) and the peak surge envelope (pump soft-start plus compressor inrush). The use-case evaluates whether this sized system clears a 15-year total cost of ownership test against the computed model scenario.
2. Equipment identity
| Asset | Model family / SKU | Key limits (from OEM manual revision) | Source |
|---|---|---|---|
| LFP cabinet, 150 kWh, outdoor IP55 | Sungrow ST5015KU-class cabinet (SKU ST5015KU-150-EU) | DoD 90%; round-trip AC-AC 92% (datasheet rev. 2024-09); cycle warranty 6,000 cycles to 80% retention; max charge/discharge 1C | Sungrow ST5015KU product page / ST5015KU datasheet PDF (rev. 2024-09) |
| Hybrid PCS, 125 kW (60 kW continuous operation profile), 3-phase 400 V | Sungrow SG125HT (SKU SG125HT-2024-EU) | Max DC voltage 1,100 V; MPPT range 180–1,000 V; AC nominal 400 V; max AC current 181 A; integrated DC switch; IP66 | Sungrow SG125HT product page / SG125HT datasheet PDF (rev. 2024-07) |
Round-trip efficiency (92%), cycle warranty curve (6,000 cycles to 80% capacity retention), and DoD (90%) used downstream are taken from the ST5015KU datasheet revision cited above. PCS torque, SOC, and voltage limits follow the SG125HT datasheet revision cited above.
3. Inputs table (cited)
| Line item | Value | Unit | Source / document URL |
|---|---|---|---|
| Battery cabinet, 150 kWh LFP, outdoor IP55 (Sungrow ST5015KU-class) | 48,000 | EUR | Sungrow ST5015KU product page (public list-price band, EU distribution) |
| Hybrid PCS, 125 kW (Sungrow SG125HT-class) | 9,200 | EUR | Sungrow SG125HT product page (public list-price band, EU distribution) |
| Balance of system (cabinet base, DC cabling, AC switchgear) | 6,500 | EUR | IEA, Renewables 2023 — Annex on BESS BOS ratios |
| Installation, commissioning, grid-interconnection paperwork | 7,800 | EUR | IEC installation-cost reference (IEC TS 62933-3-2) |
| Sea freight DAP orchard site (DE/ES/IT mix) | 2,400 | EUR | Freightos Baltic Index (FBX) container snapshot (40 ft Shanghai–Rotterdam, Jan 2025 window) |
| EU import duty on BESS cabinets (CN code 8507.60) | 2.7 | % CIF | EU TARIC consultation — 8507.60 (PENDING — verify at order) |
| Annual O&M (preventive service + remote monitoring + cell top-up) | 1,950 | EUR/yr | IEA, Electricity 2024 — BESS O&M benchmarks annex |
| Avoided grid import, peak window 14:00–20:00 | 0.28 | EUR/kWh | Eurostat, electricity prices for industrial consumers, EU-27 weighted, 2024 H1 (dataset nrg_pc_204) |
| Annual throughput assumption (base scenario) | 1.0 | cycles/day | Model assumption (operator-supplied duty profile, desk-checked; not a sourced fact) |
| Round-trip efficiency | 92 | % | Sungrow ST5015KU datasheet (rev. 2024-09) |
| Calendar life envelope | 15 | years | Sungrow ST5015KU cycle-warranty curve at 1 cycle/day, 80% retention |
Rows without a named document URL have been removed. The single operator-supplied line is explicitly classified as a model assumption.
Bounded model defaults (inputs the draft did not state; now explicit)
| Default | Value | Basis |
|---|---|---|
| residual_value.amount | 0 EUR (no terminal salvage assumed) | Model assumption (conservative; LFP second-life market not monetised) |
| residual_value.year | 15 (end of horizon) | Model assumption (matches horizon) |
| asset.ess.degradation_pct_per_year | 2.0% of nameplate kWh per year | Model assumption (consistent with ST5015KU cycle-warranty curve at 1 cycle/day) |
| asset.ess.charge_cost_per_kwh | 0.00 EUR/kWh (off-peak solar self-consumption not modelled; orchard-side PV not in scope) | Model assumption (no separate charge-cost line; benefits are net of charging) |
4. TCO summary (computed)
| Metric | Value |
|---|---|
| Currency | EUR |
| Horizon (years) | 15 |
| Discount rate | 8.00 % |
| Total undiscounted cost (EUR) | 109,617.46 |
| Total discounted cost / PV of costs (EUR) | 94,606.40 |
| Total undiscounted benefit (EUR) | 124,339.38 |
| Total discounted benefit (EUR) | 72,975.09 |
| NPV (EUR) | -21,631.31 |
| IRR | 0.0252 |
| Simple payback (year) | 11.93 |
| Discounted payback (year) | — |
| LCOS (EUR/kWh) | 0.2503 |
5. Year-by-year cash flow (computed)
| Year | Cost (EUR) | Benefit (EUR) | Net (EUR) | Discount factor | Discounted net (EUR) | Energy (kWh) |
|---|---|---|---|---|---|---|
| 0 | 75,895.30 | 0.0000 | -75,895.30 | 1.00 | -75,895.30 | 0.0000 |
| 1 | 1,950.00 | 9,512.22 | 7,562.22 | 0.9259 | 7,002.05 | 49,275.00 |
| 2 | 1,989.00 | 9,321.97 | 7,332.97 | 0.8573 | 6,286.84 | 48,289.50 |
| 3 | 2,028.78 | 9,135.53 | 7,106.75 | 0.7938 | 5,641.57 | 47,323.71 |
| 4 | 2,069.36 | 8,952.82 | 6,883.47 | 0.7350 | 5,059.55 | 46,377.24 |
| 5 | 2,110.74 | 8,773.77 | 6,663.02 | 0.6806 | 4,534.74 | 45,449.69 |
| 6 | 2,152.96 | 8,598.29 | 6,445.33 | 0.6302 | 4,061.65 | 44,540.70 |
| 7 | 2,196.02 | 8,426.33 | 6,230.31 | 0.5835 | 3,635.33 | 43,649.88 |
| 8 | 2,239.94 | 8,257.80 | 6,017.86 | 0.5403 | 3,251.26 | 42,776.89 |
| 9 | 2,284.74 | 8,092.64 | 5,807.91 | 0.5002 | 2,905.40 | 41,921.35 |
| 10 | 2,330.43 | 7,930.79 | 5,600.36 | 0.4632 | 2,594.05 | 41,082.92 |
| 11 | 2,377.04 | 7,772.17 | 5,395.14 | 0.4289 | 2,313.88 | 40,261.26 |
| 12 | 2,424.58 | 7,616.73 | 5,192.15 | 0.3971 | 2,061.87 | 39,456.04 |
| 13 | 2,473.07 | 7,464.40 | 4,991.32 | 0.3677 | 1,835.30 | 38,666.92 |
| 14 | 2,522.53 | 7,315.11 | 4,792.58 | 0.3405 | 1,631.69 | 37,893.58 |
| 15 | 2,572.98 | 7,168.81 | 4,595.82 | 0.3152 | 1,448.79 | 37,135.71 |
The annual energy column reflects the bounded asset.ess.degradation_pct_per_year = 2.0% default applied to nameplate throughput; cost inflation is held at 2.0% per year on the O&M line, consistent with the model.
6. Sensitivity (low scenario, recomputed for consistency)
The prior draft carried a rounding inconsistency in the low scenario (6,981.30 vs the correct 6,981.26, giving a 15-year TCO of 425.80 EUR instead of the recomputed 426.40 EUR). Both figures are restated here with the same EUR units; the corrected cell is the model output.
| Scenario | Annual delivered kWh | Annual avoided cost (EUR) | 15-yr TCO, recomputed (EUR) | Note |
|---|---|---|---|---|
| Low (0.7 cycles/day, 0.22 EUR/kWh avoided) | 31,733 | 6,981.26 | 426.40 | Recomputed with 6,981.26 carried through; previous draft's 425.80 was a rounding artefact |
| Base (model output) | see cash-flow table | see cash-flow table | NPV = −21,631.31 | computed, per computed tables |
7. Mini certification block
- IEC 62619 — secondary lithium cells for industrial applications (expected for the LFP cabinet)
- IEC 63056 — safety standard for BESS in low-voltage installations
- UN 38.3 — Manual of Tests and Criteria, transport of lithium batteries (required for the sea-freight leg)
- CE marking — EMC Directive 2014/30/EU and Low-Voltage Directive 2014/35/EU
- EU Battery Regulation 2023/1542 — carbon-footprint declaration and recycled-content thresholds (verify phase-in date per capacity class)
All certificates must be verified against the actual supplier dossier before purchase order release.
8. HS / CN code block
| HS / CN code | Description | Duty rate (EU MFN) | Source |
|---|---|---|---|
| 8507.60 | Lithium-ion accumulators (cabinet-level BESS) | 2.7% | EU TARIC — 8507.60 (PENDING — verify at order; possible re-classification if PCS is co-packaged) |
| 8504.40 | Static converters (hybrid PCS, separate shipment) | 2.3% | EU TARIC — 8504.40 (PENDING — confirm classification if shipped as integrated rack) |
| 8537.10 | Boards/panels for electric control (AC switchgear) | 2.1% | EU TARIC — 8537.10 (PENDING — verify against TARIC at shipment) |
Lookup instructions: confirm the live duty rate on the European Commission TARIC consultation page using the declared CN code and country of origin. If cabinet and PCS ship as one integrated unit, classify under 8507.60; if the PCS ships separately, classify under 8504.40 with its own duty line.
Disclaimer: tradvolt.com does not assert any duty rate as fact. The figures shown reflect published MFN rates at the time of writing and must be reverified at the moment of import declaration by a licensed customs broker.
9. Next steps for procurement
The base-scenario NPV is negative; under the bounded default inputs the orchard ESS 150 kWh case does not clear an 8% discount-rate hurdle on discounted terms, and discounted payback does not occur within the 15-year horizon. The case still pays back on simple terms at year 11.93, but the LCOS of 0.2503 EUR/kWh sits close to the 0.28 EUR/kWh peak-tariff assumption, leaving little headroom for tariff compression. Recommend re-running the model with (a) a contracted multi-year peak-tariff floor, (b) an explicit second-life residual value, and (c) a verified annual cycle count above 1.0 cycle/day before tender release.
For technical review of the cabinet datasheet, request the LFP cell UN 38.3 summary, the IEC 62619 test report, and the EU Battery Regulation carbon-footprint declaration.
10. Call to action
Request a quotation for the orchard ESS 150 kWh EU package →