Greenhouse + 1 MWp Solar PV: Use-Case & Total Cost of Ownership (South Africa)

Verdict (first 100 words): A 1 MWp grid-tied solar PV array, modelled as LONGi Hi-MO 6 Explorer LR5-54HTH modules with a Sungrow SG125HV string inverter, co-located with a South African greenhouse, returns NPV = ZAR 17,969,658 at a 12.00% discount rate over a 25-year horizon, with IRR = 28.97%, simple payback = 3.97 years, discounted payback = 5.48 years, and LCOE = ZAR 1.01/kWh. Equipment: LONGi Hi-MO 6 LR5-54HTH (LR5-54HTH 515–545 W class HPBC cells) + Sungrow SG125HV three-phase string inverter. Location: South Africa. Horizon: 25 years. Evidence date: 2025-01-15. Limitation: every financial figure below is taken verbatim from the COMPUTED TABLES (computed); equipment performance parameters are model assumptions pending RFQ confirmation.

1. Use-Case Description

The scenario models a 1 MWp DC ground-mount PV system co-located with a commercial greenhouse in South Africa. The DC side is built from LONGi Hi-MO 6 Explorer LR5-54HTH mono-Si modules (HPBC cell technology, HPBC+ efficiency up to 25.8% per the Hi-MO X6 product page: https://www.longi.com/en/products/modules-series/hi-mo-x6/; module wattage and warranty revision confirmed at RFQ). The AC side uses a Sungrow SG125HV three-phase string inverter from the Sungrow C&I string-inverter range (https://www.sungrowpower.com/en/products/string-inverter; the SG125HV is the 125 kW utility/C&I model listed on this page; exact datasheet revision confirmed at RFQ). The greenhouse load is daytime-aligned (drip fertigation pumps, horizontal airflow fans, LED supplemental lighting, pad-and-fan evaporative cooling, screen motors), giving a high self-consumption ratio.

2. Inputs Table (Cited) & Model Assumptions

Financial figures in the TCO tables below are taken verbatim from the COMPUTED TABLES supplied by TradVolt's scenario model. The numeric inputs driving them are stated here; rows that are not directly published as a single document are flagged as model assumption.

3. TCO Summary (COMPUTED — computed)

4. Year-by-Year Cash Flow (COMPUTED — computed)

Notes on the COMPUTED TABLES: Year 0 is the CapEx outflow. The Year 12 cost line of ZAR 1,216,327.80 combines the Sungrow SG125HV inverter replacement (ZAR 750,000) with that year's escalated fixed O&M. The Year 25 cost line includes the ZAR 350,000 decommissioning reserve on top of the final-year O&M. All discount factors in the cash-flow table are at the 12.00% base WACC.

5. Sensitivity Table

Each row holds the time basis (25-year horizon, year-by-year cash-flow basis) constant and varies a single input. CapEx- and yield-adjusted rows reuse the same O&M, inverter-replacement, and decommissioning lines as the base case; only CapEx and/or annual generation scale linearly. The LCOE, NPV, IRR, payback, and discount factor figures quoted below are illustrative scenario ratings for the decision table; the only computed TCO figures are those in the COMPUTED TABLES above.

6. Verdict by Scenario

• Base case — GO. LCOE = ZAR 1.01/kWh sits well below the ZAR 1.50/kWh Eskom year-1 tariff; discounted payback 5.48 years sits inside the LONGi Hi-MO 6 product warranty window.
• Low tariff escalation (5.0%) — CAUTION. Costs are unchanged, but the benefit stream compresses; equity IRR drops and payback lengthens. Negotiate a tariff-escalation pass-through in the PPA or accept a lower IRR.
• High tariff escalation (12.0%) — strongly GO. Upside case; the project remains comfortably NPV-positive.
• Coastal cloud-belt yield — CAUTION. Knysna / southern Cape yield can drop below 1,500 kWh/kWp/yr; commission a 12-month on-site yield assessment (PVGIS methodology) before commit.
• CapEx +20% — CAUTION. LCOE rises versus base, still below tariff but with a thin margin; secure fixed-price EPC and a 10% contingency.
• Stressed WACC (16%) — CAUTION. LCOE rises versus base; negotiate blended green finance or concessional DFIs to bring WACC back below 12%.
• Worst-case combined — NO-GO without subsidy. Only an Eskom demand-market incentive or the Section 12B Income Tax Act renewable-energy allowance rescues this stack. SARS is the cited reference for Section 12B (see SARS Customs & Excise Tariff landing page: https://www.sars.gov.za/customs-and-excise/tariff/; the Section 12B interpretation note is the relevant SARS publication and exact URL is confirmed at RFQ).

7. Standards & Certification Block

Disclaimer: no certificate has been issued for the modelled project. The model assumes compliant Tier-1 components per the standards listed below; certificate numbers and issuing bodies are confirmed at RFQ award.

8. HS Code Block — Duty Lookup

Duty rates below are lookup placeholders only. The computed rates are obtained by querying the official tariff pages cited for each row.

Duty rate disclaimer: TradVolt does not assert any specific rate as fact. SARS publishes the official South African Customs and Excise Tariff at https://www.sars.gov.za/customs-and-excise/tariff/; consult a licensed clearing agent or SARS customs ruling before any import decision. Possible ITAC import-control measures or Section 12B Income Tax Act renewable-energy allowance apply but require independent verification against the ITAC import-control page: https://www.itac.org.za/import-control/.

9. Cross-Border Reference (Incidental)

If the equipment is sourced via a non-ZA port of entry, the EU TARIC consultation tool (https://ec.europa.eu/taxation_customs/dds2/taric/taric_consultation.jsp?Lang=en), USITC HTS (https://hts.usitc.gov/), UK Global Tariff (https://www.trade-tariff.service.gov.uk/), and ICC Incoterms 2020 (https://iccwbo.org/business-solutions/incoterms-rules/incoterms-2020/) are the cited cross-border lookups. Wood packaging must comply with IPPC ISPM 15 (https://www.ippc.int/en/core-activities/standards-setting/ispms/). Lithium-bearing components fall under UN Manual of Tests and Criteria, UN 38.3 (ST/SG/AC.10/11/Rev.7) — reference: https://unece.org/transport/dangerous-goods/un-manual-tests-and-criteria (cite designation «ST/SG/AC.10/11/Rev.7» verbatim).

10. Call to Action

Request a ZA-specific EPC and financing quote bundle for a 1 MWp greenhouse-coupled solar PV system (LONGi Hi-MO 6 Explorer LR5-54HTH + Sungrow SG125HV):

Submit a 1 MWp Greenhouse Solar PV RFQ (South Africa) — tradvolt.com/rfq/