Orchard Solar 250 kWp — Use-Case & Total Cost of Ownership (Australia)

Verdict (scenario model, evidence date 2026-09-22): a 250 kWp Australian orchard solar PV system built on Huawei SUN2000-330KTL-H1 string inverters and Jinko Tiger Neo 580 W (N-type) bifacial modules, evaluated over a 25-year horizon at a 5.00 % real discount rate, returns NPV = AUD 1,386,278, simple payback = 2.57 years, discounted payback = 2.82 years, IRR = 39.61 %, and a levelised cost of energy of AUD 0.0648/kWh. The verdict is Go for the base case. Limitation: the figures are computed for the specific equipment family, yield, tariff, and capex assumption stated in §3 and are not transferable to other inverter/module pairs or tariff structures without re-running the scenario model.

1. Use-case profile

A mid-sized Australian orchard operator (citrus, stone fruit, or apple) is evaluating a 250 kWp ground-mount array on a non-productive perimeter or fallow paddock. The system displaces daytime irrigation-pump load (typical orchard seasonal pumping coincides with peak sun) and exports the surplus. Site class is regional NSW/SA/Qld inland; tariff assumption is a small-commercial Time-of-Use structure. The operator wants one number: levelised cost of energy in AUD/kWh over 25 years, not a brochure figure.

2. Equipment anchor (named models)

This page fixes a specific, publicly marketed equipment family. The TCO in §4 is computed against this anchor and is not transferable to other inverters or modules without re-running the scenario model.

Equipment limits (torque on terminations, SOC windows if a battery is added later, voltage windows, MPPT current) are not asserted on this page — they must be confirmed against the OEM manual revision that ships with the procurement lot, which the Tradvolt RFQ flow records per shipment.

3. Inputs table (named-source)

Every input below is tied to a primary source document URL or, where the source is JS-rendered, to the OEM model designation (confirmed at RFQ). Inputs not derivable from the cited documents are flagged as bounded model assumptions in §6.

3.1 Bounded model defaults (explicit, not sourced)

The following defaults were not stated in the draft inputs and are presented as explicit bounded model assumptions; they are the values used by the scenario model:

• PV export tariff (asset.pv.export_tariff_per_kwh) — set equal to the avoided-grid tariff above (0.28 AUD/kWh) under the 100 % self-consumption assumption in §6; in cases where actual on-site load is lower, the surplus exported falls to a wholesale FiT-style rate that is typically well below 0.28 AUD/kWh (PENDING — confirm at RFQ against the local DNSP retailer schedule).
• Residual value — 0 AUD at year 25 (system treated as fully depreciated; no salvage credit to NPV).
• Self-consumption share — 100 % of generated kWh valued at the avoided-grid tariff.
• Inflation — not modelled; all figures are in real AUD.
• Financing — not modelled; unlevered project returns only.

4. scenario TCO results

The two tables below are the computed output of the Tradvolt TCO model for this scenario. These are the only financial figures on this page. Prose elsewhere refers back to these tables and does not assert any other number.

LCOE convention used here is the discounted-cost-only levelised cost: LCOE = PV of costs ÷ PV of lifetime generation, with PV of costs = 342,844.44 AUD and lifetime generation derived from the year-by-year kWh column in §5. The avoided-grid benefit is reported separately as NPV and is not netted into the LCOE numerator. This is the "levelised cost" figure, not a "total cost of ownership" figure; the two are reported distinctly and are not interchangeable.

5. Year-by-year cash flow

6. Model assumptions & limitations

• Residual value — bounded assumption: residual_value.amount = 0 AUD; residual_value.year = 25. The system is treated as fully depreciated at horizon end; no salvage is credited to NPV.
• Self-consumption share — bounded assumption: asset.pv.self_consumption_pct = 100 % of generated kWh is valued at the avoided-grid tariff (i.e., on-site load matches or exceeds generation on the relevant interval). Where actual on-site load is lower, the surplus exported falls to a wholesale FiT-style rate that is typically well below 0.28 AUD/kWh — in that case NPV falls and payback lengthens.
• CAPEX, OPEX, avoided-tariff, yield, degradation, inverter-replacement year, inverter-replacement cost, discount rate — bounded assumptions listed in §3; they are the inputs to the scenario model and are not independent measurements.
• Equipment limits — Huawei SUN2000-330KTL-H1 and Jinko Tiger Neo 580 W limits (torque on terminations, SOC windows if a battery is added later, voltage windows, MPPT current) are taken from the OEM manuals at the revisions shipped with the procurement lot, recorded per shipment in the Tradvolt RFQ flow.
• Scope — the figures are for the named equipment family, inland-AU orchard class, and 25-year horizon. Re-running the scenario model is required for coastal/cloudy sites, different inverter/module pairs, different storage configurations, or different tariff structures.

7. Certification block

Hardware-and-installation expectations for a project of this size. Each row cites the issuing body and the standard designation with edition; always confirm against the latest revision at the issuing body.

8. HS code block & duty lookup

Indicative Harmonised System codes for the principal components. Duty rates are listed as PENDING: do not treat the duty percentages below as fact, and verify against the current Australian Border Force working tariff before any customs declaration.

Lookup instructions. Open the Australian Border Force Working Tariff at abf.gov.au → Working Tariff. Search each 6-digit code above, then read the chapter notes, additional duties, GST, and any anti-dumping measures. Confirm preference-eligibility under the FTA in force at the time of import (e.g., ChAFTA, KAFTA, AANZFTA). Some PV modules may be subject to anti-dumping/countervailing measures that vary by exporter; cross-check the current measures list at trade.gov and cbp.gov for analogous US practice where relevant.

Disclaimer. Duty rates and HS classifications shown as PENDING have not been asserted as fact. Final classification and duty assessment rest with the importer of record and Australian Border Force at the time of entry. Tradvolt does not provide customs advice.

9. Next steps

The primary CTA above routes to the Tradvolt RFQ form. The secondary CTA downloads the scenario model CSV that produced the figures in §4 and §5 (same inputs as the page; same outputs, cell-for-cell). Procurement teams should reference the equipment anchor in §2 (Huawei SUN2000-330KTL-H1 + Jinko Tiger Neo 580 W) and the horizon (25 yr, 5.00 % real) when submitting. Equipment revisions, OEM manual titles, and exact revisions are recorded per shipment in the RFQ flow.

Sources index

1. CSIRO, GenCost 2023-24: Project technology cost estimates, 2024, p. 22, Table 4 — CSIRO GenCost 2023-24
2. IEC 61215-1:2021 — Crystalline silicon PV modules — Design qualification and type approval, Part 1 — catalogue at IEC Webstore
3. IEC 61215-2:2021 — Crystalline silicon PV modules — Design qualification and type approval, Part 2 — catalogue at IEC Webstore
4. IEC 62109-1:2010 — Safety of power converters for use in photovoltaic power systems, Part 1 — catalogue at IEC Webstore
5. IEC 62109-2:2011 — Safety of power converters for use in photovoltaic power systems, Part 2 — catalogue at IEC Webstore
6. UL 61730-1 — Photovoltaic (PV) Module Safety Qualification — Part 1 — UL 61730-1 standard page
7. AEMO, 2024 Integrated System Plan — Inputs and Assumptions workbook, accessed via AEMO ISP publication hub (exact sheet/cell PENDING — confirm at RFQ)
8. Huawei FusionSolar, SUN2000-330KTL-H1 product page — Huawei SUN2000-330KTL-H1
9. JinkoSolar, Tiger Neo N-series product page — JinkoSolar product page (exact model and datasheet revision confirmed at RFQ; Jinko datasheet PDFs are gated by region)
10. K2 Systems, N-Rack ground-mount system product page — K2 Systems N-Rack ground-mount system (manual revision confirmed at RFQ; downloads are bot-walled)
11. Australian Border Force — Working Tariff lookup — abf.gov.au
12. TradVolt RFQ form (live) — /rfq/