Verdict: PROCEED. A 400 kWp ground-mount PV plant on a South African golf estate, built with Jinko Tiger Neo 3.0 (JKM650-670N-66QL6-BDV-F1) 670 Wp N-type TOPCon modules and Sungrow SG50CX three-phase string inverters (8 x 50 kW = 400 kW AC), delivers NPV = ZAR 12,268,375 at an 8.00 % nominal discount rate over a 25-year horizon, with a discounted payback of 1.79 years, simple payback of 1.60 years, and LCOE of ZAR 0.3287/kWh (scenario model, evidence date 2026-01-15). Limitation: figures assume an NRS 097-2-1 SSEG interconnection at the estate boundary and a 75 % daytime self-consumption share driven by irrigation-pump and clubhouse HVAC load; deviations from the stated load profile shift the NPV per the §3 sensitivity tables.

Golf-Course Solar 400 kWp — 25-Year TCO (South Africa)

1. Inputs

2. Equipment family and certifications

2.1 Modules — Jinko Tiger Neo 3.0 (JKM670N-66QL6-BDV-F1)

• Family: Jinko Tiger Neo 3.0 N-type TOPCon, bifacial double-glass
• Nominal max power (Pmax): 670 Wp (range 650–670 Wp)
• Module efficiency: up to 24.80 % (per JinkoSolar Tiger Neo 3.0 product page)
• Quantity: ~598 modules (~598 × 670 Wp ≈ 400 kWp DC; module count rounded to integer at procurement)
• Voc / Isc / Vmpp / Impp (670 W): 50.98 V / 16.22 A / 43.09 V / 15.55 A (per Tiger Neo 3.0 datasheet (PDF))
• BNPI bifacial boost: up to 746 Wp
• Temperature coefficient Pmax: -0.26 %/°C
• Certifications: IEC 61215-1:2021 ed2 (design qualification — TC 82), IEC 61730-1:2016 ed2 (PV module safety — TC 82)
• Warranty: 12-year product workmanship + 30-year linear power output (first-year ≤ 1 % degradation, then ≤ 0.35 %/yr years 2–30) per JinkoSolar Tiger Neo 3.0 product page

2.2 Inverters — Sungrow SG50CX

• Family: Sungrow SG50CX three-phase string inverter (multi-MPPT), within the broader Sungrow string inverter range
• Rated AC output: 50 kW
• Quantity: 8 units (8 × 50 kW = 400 kW AC)
• Max DC input voltage: 1,100 Vdc; MPPT range 180–1,000 Vdc
• Max input current per MPPT: 30 A; 5 MPPTs per unit
• EU/ZA grid code compliance: NRS 097-2-1 (SSEG); safety per IEC 62109-1:2010 (PCE safety — TC 82) and IEC 62109-2:2011 (inverter particular requirements — TC 82)
• Protection: DC reverse-polarity, AC short-circuit, anti-islanding per NRS 097-2-1, Type II DC/AC SPD
• IP66 / C5 corrosion rating, design life ≥ 12 yr

2.3 Mounting, MV step-up and civil

• Fixed-tilt ground mount, galvanized steel per ISO 1461:2009 hot-dip galvanizing (cite standard name in text; no public ISO catalogue URL provided)
• MV step-up transformer 500 kVA, 11 kV / 400 V, distribution class
• SSEG interface per NERSA electricity pricing and tariffs; SSEG application per municipal schedule

3. TCO summary (scenario model output)

Reconciliation: Total undiscounted benefit ZAR 35,917,672.72 minus total undiscounted cost ZAR 2,701,323.29 yields a nominal cumulative undiscounted net cashflow of ZAR 33,216,349.43 over 25 years (year 0 capex ZAR 1,896,600 is included within total undiscounted cost). Discounting at 8.00 % nominal gives NPV = ZAR 12,268,375.47.

3.1 Year-by-year cash flow (scenario model output)

Note on year 12 cost spike: the year-12 cost row of ZAR 290,222.54 includes the recurring OPEX for that year plus the inverter replacement outflow captured by the scenario model at its year-12 nominal treatment; the table is the single computed mathematics for this page.

4. Sensitivity (illustrative ranges — recompute at RFQ)

Sensitivities below illustrate the directional effect of single-input moves on 25-year NPV at the base 8 % nominal discount; figures are rounded indicators, not model outputs.

4.1 Self-consumption share (75 % base)

4.2 Tariff escalation (2.0 %/yr nominal above CPI, base)

4.3 Discount rate (nominal, base 8.0 %)

4.4 Yield (kWh/kWp/yr)

5. Verdict by scenario

• Base case (75 % self-consumption, 2 % nominal tariff escalation above CPI, 8 % nominal discount): NPV = ZAR 12,268,375, discounted payback = 1.79 yr, simple payback = 1.60 yr. Strongly positive; recommend proceeding subject to grid-interconnect study and a confirmed NRS 097-2-1 SSEG approval.
• Conservative case (60 % self-consumption, 0 % nominal escalation, 10 % nominal discount): NPV falls materially below base; still expected positive but recommendation is to defer until wheeling credit of ≥ ZAR 0.85/kWh is contractually confirmed by the municipality / NERSA.
• Stress case (60 % self-consumption, 0 % nominal escalation, 12 % nominal discount, yield 1,500 kWh/kWp): NPV drops to marginal territory; defer until load profile improves or tariffs rise.
• Upside case (90 % self-consumption, 4 % nominal escalation, 8 % nominal discount): NPV rises materially above base; pursue immediately if pumps run 10+ daytime hours and export channel is constrained.

6. Compliance block (Mini Cert)

7. HS Code Block (indicative)

Disclaimer: TradVolt does not provide customs or tax advice. The HS classifications above are indicative starting points only; the importer is responsible for final classification and payment of any duties, VAT, anti-dumping or safeguard levies. Always confirm with a licensed customs broker or directly with SARS Schedules to the Customs and Excise Act 1964 and ITAC import control before importing.

8. Assumptions log

• Residual value at year 25 = ZAR 0 (model assumption — bounded).
• Tariff escalation 2.0 %/yr and OPEX inflation 1.0 %/yr are both expressed as nominal rates above CPI; discount rate 8.0 % is also nominal. Convention is nominal-on-nominal throughout — no real/nominal mixing.
• Self-consumption share of 75 % is a model assumption (TradVolt Q4 2025 benchmark for daytime-pump-dominated golf-estate load profiles); it is not a measured site value.
• Yield of 1,650 kWh/kWp/yr is a model assumption — bounded; site-specific value to be confirmed at RFQ.
• Inverter replacement at year 12 is treated as a nominal outflow at the nominal discount rate (consistent with the rest of the cashflow stream); the year-12 cost row is the scenario model value.
• Module count ~598 of JKM670N-66QL6-BDV-F1 is rounded to integer at procurement; per-watt pricing is preserved.

9. Next steps

• Request a full BoM with alternate mounting options (single-axis tracker vs. fixed-tilt) at /rfq/
• Confirm NRS 097-2-1 SSEG application with the local municipality / HoD before ordering long-lead items (Jinko Tiger Neo 3.0 modules carry an 8–12 week lead time ex-Shanghai).