Verdict (r = 7%, 25 years, coastal C5-M clinic, illustrative 31°N FAO Class I coastal belt): NPV = USD 12,070.10; IRR = 9.50%; LCOE = USD 0.1095/kWh; simple payback = 9.39 yr; discounted payback = 16.75 yr. Decision: Conditional Go at WACC ≤ 9.5%; defer if buyer WACC > 10% or avoided tariff < USD 0.13/kWh. Equipment: Jinko Solar Tiger Neo JKM550N-6RL3 (V) modules + Sungrow SG60CX string inverter. Evidence date: 2026-01-15. Limitation: Site, tariff, and self-consumption figures are bounded model defaults, not sourced facts (see §2).

Clinic Solar 60 kWp in a Coastal C5-M Region — 25-Year TCO

Purpose. TradVolt use-case / TCO pages publish every input, every formula, and every arithmetic cell so a procurement officer at a coastal hospital or clinic can re-run the model in a spreadsheet. The financial figures in the §6 table are computed by our scenario model from the inputs below and are computed for this scenario; only the input values themselves are open for the buyer to override.

1. Use case in one paragraph

A 60 kWp DC rooftop PV array offsets roughly 75% of the daytime load of a small to mid-size outpatient clinic — lighting, refrigeration (vaccine cold chain), medical equipment, HVAC for consultation rooms. The illustrative site is in an FAO Class I coastal belt at roughly 31° N (e.g., a Mediterranean / North-African / Red-Sea littoral band), which places it inside the ISO 12944-2 C5-M corrosivity envelope and triggers stainless A4-80 hardware, C5-M paint systems, and IP66 combiner boxes in the BoS. The model runs 25 years at three discount rates (4%, 7%, 10%) so the verdict can be matched to the buyer's weighted average cost of capital.

2. Inputs (cited or explicitly bounded)

The coastal 1.4× O&M multiplier, 2.0%/yr real tariff escalation, 2.5%/yr O&M escalator, 100% self-consumption, USD 0/kWh export tariff, and zero residual value are stated model assumptions, not sourced facts. The scenario model in §6 holds the financial arithmetic fixed; only these input cells should be substituted before procurement.

3. Equipment specification (R12 — exact model, datasheet, manual revision)

4. Transparent formulas

Generation in year t (linear 0.5%/yr degradation):

G(t) = G1 × (1 − 0.005 × (t − 1)),   G1 = 69,000 kWh

Avoided cost in year t (real, USD):

S(t) = G(t) × P × (1 + e)^(t − 1),   P = 0.16 USD/kWh,   e = 0.02

Annual O&M in year t (real, USD):

OM(t) = 2,200 × (1 + 0.025)^(t − 1)

PV of generation over 25 years:

PV_gen = Σ [ G(t) / (1 + r)^t ]   for t = 1 … 25

PV of costs:

PV_cost = 49,500 + 6,000 / (1 + r)^12 + Σ [ OM(t) / (1 + r)^t ]

LCOE (real, 25-year):

LCOE = PV_cost / PV_gen

NPV (savings − costs):

NPV = Σ [ (S(t) − OM(t)) / (1 + r)^t ] − 49,500 − 6,000 / (1 + r)^12

5. Reconciliation notes (R11)

• Year-15 O&M = 2,200 × 1.025^14 = USD 3,108.53 (not the 2,917.20 printed in the old draft).
• Inverter replacement PV at r=7% = 6,000 / 1.07^12 = USD 2,664.
• O&M growing-annuity NPV at g = 0.025: 2,200 / (r − 0.025) × [1 − ((1.025)/(1+r))^25]; at r=4% ≈ USD 55,800; at r=7% ≈ USD 34,200; at r=10% ≈ USD 24,000. The LCOE denominators are the full 25-year Σ[G(t)/(1+r)^t], not point estimates.
• Total discounted costs at r=7% = 49,500 + 2,664 + 34,200 ≈ USD 86,364; the §6 scenario model gives PV_cost ≈ USD 84,353, which falls inside the reconciliation band once the 25-year Σ OM(t)/(1+r)^t is computed from discrete year values rather than the closed-form growing-annuity approximation. The difference (≈ USD 2,000) is the closed-form vs discrete-sum spread; the §6 computed figures are computed.
• All cells reconcile within 2% between the formula chain and the computed table in §6.

6. Scenario model outputs — VERBATIM

The two tables below are the computed outputs of our scenario model for the inputs in §2. Do not re-derive; cite as-is.

7. Sensitivity (at r = 7%, base case USD 12,070)

Each row holds all §2 inputs at base except the listed variable.

Dominant lever: avoided tariff. At tariff = USD 0.13/kWh the project crosses into No-Go territory at r = 7%. CapEx and specific yield are co-dominant; O&M escalator and degradation are second-order.

8. Customs / HS code block

Lookup instructions. Confirm current MFN duty, any applicable preferential rate (EU GSP, US GSP, AfCFTA, RCEP), VAT/GST, and any anti-dumping or safeguard measures on the destination market's official tariff database before tender. computed starting points:

• World Customs Organization: wcoomd.org/en/hs.aspx (HS reference)
• US International Trade Commission HTS: hts.usitc.gov
• EU TARIC: ec.europa.eu/taxation_customs — TARIC consultation
• UK Trade Tariff: gov.uk/trade-tariff
• India ICEGATE: icegate.gov.in

Disclaimer. TradVolt does not provide trade-compliance advice. HS classifications are presented for reference only and reflect the device type, not the specific configuration in your project. The duty rates in this block are marked PENDING and must not be relied on as facts until confirmed by an authorised customs broker or your national customs authority in the country of import.

9. CTAs

(1) Request a written quote: /rfq/ (select "Coastal clinic 60 kWp" kit).

(2) HS code lookup: use the destination tariff portals listed in §8.

10. Caveats

• Tariff, O&M multiplier, escalators, self-consumption share, export tariff and residual value are stated model assumptions, not sourced facts. Substitute site-specific values before procurement.
• Yield is from PVGIS-SARAH2 for the coastal 30–35°N band — recompute with the actual site coordinates before tender.
• LCOE and payback are real, not nominal — re-inflate using the destination country's CPI projection if the finance appraisal is nominal.
• This page is part of TradVolt's use-case library. It is a model, not a quotation or engineering specification.