Hospital Solar 2 MWp TCO — AU Use Case (R9)

Use-case assessment for a 2 MWp rooftop solar PV system at a mid-size Australian hospital, using Sungrow SG250HX string inverters and Jinko Solar JKM560N-72HL4-BDV modules. All financial figures are the output of the scenario TCO model; computed for evidence date 2026-09-22. Limitation: the model is bound to a 25-year horizon, 8.00% discount rate, and the bounded input set declared in §3.

0. Verdict at a glance

2 MWp rooftop PV at an Australian hospital: NPV = AUD 5,897,848.87; discounted payback = 3.27 yr; simple payback = 2.79 yr; LCOE = 0.0890 AUD/kWh; IRR = 36.85% over 25 yr at 8.00% discount — proceed to RFQ.

1. Scope and use-case context

Australia operates a high-electricity-cost grid context with strong daytime hospital baseloads (HVAC, chillers, sterilisation, lighting, ICT). A 2 MWp rooftop PV array offsets a large share of daytime grid imports during operating hours. kWp = kilowatts-peak nameplate DC capacity; kWh = kilowatt-hour. Equipment family for this use case: Sungrow SG250HX 250 kW three-phase string inverter (8 units) and Jinko Solar Tiger Neo JKM560N-72HL4-BDV 560 W bifacial double-glass monocrystalline N-type modules (~3,572 modules).

2. Equipment model and datasheet references

OEM portals are JS-rendered; datasheet PDF revisions are confirmed at RFQ. The OEM-issued documents above back the electrical and mechanical limits (Vmp/Imp/Voc/Isc envelope of Tiger Neo 3.0; SG125HT-class C&I 1500 V string topology in the Sungrow range) used in the bounded inputs of §3.

3. Inputs table

Every named input below is either sourced or labelled as a model assumption. The base-case inputs match the COMPUTED TABLES verbatim.

4. TCO summary (computed, computed)

5. Year-by-year cash flow (computed, computed)

6. Pessimistic and optimistic scenarios (illustrative simple payback only)

The COMPUTED TABLES cover the base case only. The pessimistic and optimistic rows below are illustrative simple-payback sketches retained from the draft for context; they are not computed NPV / IRR / LCOE outputs and must not be substituted for the base-case figures in §4.

7. Risks and what to verify before contract

8. CTAs

Metric	Value	Source
Equipment	Sungrow SG250HX (250 kW string) × 8 + Jinko Solar JKM560N-72HL4-BDV (560 W bifacial) ≈ 3,572 modules	OEM datasheet references §2
Location	AU (state retail price determination / DNSP to be confirmed at RFQ)	Scope assumption §1
Horizon	25 years	COMPUTED TABLES §4
Discount rate	8.00 %	COMPUTED TABLES §4
NPV (AUD)	5,897,848.87	COMPUTED TABLES §4
Discounted payback (yr)	3.27	COMPUTED TABLES §4
Simple payback (yr)	2.79	COMPUTED TABLES §4
LCOE (AUD/kWh)	0.0890	COMPUTED TABLES §4
Evidence date	2026-09-22	This page
Limitation	Pessimistic / optimistic rows in §6 are illustrative simple-payback sketches only; not computed NPV / IRR / LCOE outputs	This page
Verdict	Proceed to RFQ	This page

Item	Brand / model	Quantity	Datasheet / product page
String inverter	Sungrow SG250HX (250 kW, three-phase, 1500 V DC, MV-ready for C&I/utility)	8	Sungrow string inverter range (SG series, incl. SG125HT C&I 3-phase) — exact SG250HX datasheet PDF revision confirmed at RFQ
PV module	Jinko Solar Tiger Neo JKM560N-72HL4-BDV (560 W N-type bifacial double-glass, TOPCon)	~3,572	JinkoSolar Tiger Neo 3.0 product page and Tiger Neo 3.0 datasheet PDF (JKM650-670N-66QL6-BDV-F1-EN) — exact JKM560N-72HL4-BDV datasheet PDF revision confirmed at RFQ
Mounting	K2 Systems CrossRail pitched-roof rail kit (model confirmed at RFQ)	site-specific	K2 Systems CrossRail System — installation SOP / datasheet revision confirmed at RFQ

Input	Value	Unit	Source / status
System size (DC nameplate)	2,000	kWp	Scope assumption (this use case)
CAPEX all-in (modules, racking, inverters, BoS, install, commissioning)	1,800,000	AUD	Model assumption — verified pricing-desk quote to replace at RFQ; cross-reference against commercial benchmarks
CAPEX per kWp (derived)	900	AUD/kWp	Computed: 1,800,000 / 2,000
Specific yield (annual)	1,300	kWh/kWp/yr	Model assumption — typical AU rooftop range; verify against EC JRC PVGIS / IEA published rooftop yields for the site climate zone
Degradation factor	0.5	% per year	Model assumption — bounded; matches typical Jinko Tiger Neo linear-warranty regime (1st-year ≤1%, then 0.4%/yr; see Tiger Neo 3.0 datasheet PDF)
Self-use share (annualised, hospital profile)	85	%	Model assumption — typical daytime-heavy hospital load profile; verify with 12-month interval-meter data
Grid import price (blended, incl. network/losses)	0.30	AUD/kWh	Model assumption — verify against the relevant state retail price determination at the time of contract
Feed-in tariff (export)	0.05	AUD/kWh	Model assumption — verify against the applicable state FiT scheme (NSW / QLD / VIC retailer schedule)
Annual opex (O&M, insurance, monitoring, inverter reserve)	45,000	AUD/yr	Model assumption — verify against an O&M provider quote
Discount rate	8.00	%	Model assumption (commercial hurdle rate)
Tariff escalation	model assumption — bounded default	% per year	Model assumption — bounded default retained for reviewer awareness
Residual value (amount)	model assumption — bounded default (set to 0)	AUD	Model assumption — bounded default retained for reviewer awareness
Residual value (year)	model assumption — bounded default (= horizon)	year	Model assumption — bounded default retained for reviewer awareness
Analysis horizon	25	years	Matches COMPUTED TABLES horizon

TCO summary
Metric	Value
Currency	AUD
Horizon (years)	25
Discount rate	8.00 %
Total undiscounted cost (AUD)	3,241,363.49
Total discounted cost / PV of costs (AUD)	2,370,331.61
Total undiscounted benefit (AUD)	20,492,214.53
Total discounted benefit (AUD)	8,268,180.48
NPV (AUD)	5,897,848.87
IRR	0.3685
Simple payback (year)	2.79
Discounted payback (year)	3.27
LCOE (AUD/kWh)	0.0890

Year-by-year cash flow
Year	Cost (AUD)	Benefit (AUD)	Net (AUD)	Discount factor	Discounted net (AUD)	Energy (kWh)
0	1,800,000.00	0.0000	-1,800,000.00	1.00	-1,800,000.00	0.0000
1	45,000.00	682,500.00	637,500.00	0.9259	590,277.78	2,600,000.00
2	45,900.00	692,669.25	646,769.25	0.8573	554,500.39	2,587,000.00
3	46,818.00	702,990.02	656,172.02	0.7938	520,890.51	2,574,065.00
4	47,754.36	713,464.57	665,710.21	0.7350	489,316.88	2,561,194.67
5	48,709.45	724,095.20	675,385.75	0.6806	459,656.19	2,548,388.70
6	49,683.64	734,884.21	685,200.58	0.6302	431,792.59	2,535,646.76
7	50,677.31	745,833.99	695,156.68	0.5835	405,617.25	2,522,968.52
8	51,690.86	756,946.91	705,256.06	0.5403	381,027.90	2,510,353.68
9	52,724.67	768,225.42	715,500.75	0.5002	357,928.51	2,497,801.91
10	53,779.17	779,671.98	725,892.82	0.4632	336,228.83	2,485,312.90
11	54,854.75	791,289.10	736,434.35	0.4289	315,844.07	2,472,886.34
12	55,951.84	803,079.30	747,127.46	0.3971	296,694.59	2,460,521.91
13	57,070.88	815,045.18	757,974.30	0.3677	278,705.58	2,448,219.30
14	58,212.30	827,189.36	768,977.06	0.3405	261,806.73	2,435,978.20
15	59,376.54	839,514.48	780,137.93	0.3152	245,932.01	2,423,798.31
16	60,564.08	852,023.24	791,459.17	0.2919	231,019.39	2,411,679.32
17	61,775.36	864,718.39	802,943.03	0.2703	217,010.57	2,399,620.92
18	63,010.86	877,602.70	814,591.83	0.2502	203,850.81	2,387,622.82
19	64,271.08	890,678.98	826,407.89	0.2317	191,488.68	2,375,684.70
20	65,556.50	903,950.09	838,393.59	0.2145	179,875.84	2,363,806.28
21	66,867.63	917,418.95	850,551.32	0.1987	168,966.91	2,351,987.25
22	68,204.99	931,088.49	862,883.51	0.1839	158,719.23	2,340,227.31
23	69,569.09	944,961.71	875,392.62	0.1703	149,092.74	2,328,526.18
24	70,960.47	959,041.64	888,081.17	0.1577	140,049.81	2,316,883.55
25	72,379.68	973,331.36	900,951.68	0.1460	131,555.08	2,305,299.13

Scenario	CAPEX (AUD)	Specific yield (kWh/kWp/yr)	Self-use	Grid (AUD/kWh)	FiT (AUD/kWh)	Opex (AUD/yr)	Simple payback (yr)	Verdict
Pessimistic	2,160,000	1,150	75%	0.26	0.03	55,000	5.26	Marginal — verify load match
Base	1,800,000	1,300	85%	0.30	0.05	45,000	2.79 (per COMPUTED TABLES)	Proceed to RFQ
Optimistic	1,620,000	1,450	95%	0.34	0.08	38,000	1.78	Confirm yield modelling before contracting

Both CTAs resolve to the live TradVolt RFQ form at /rfq/. The OEM-issued module, inverter and rail-kit datasheets are issued at RFQ confirmation against the OEM portals referenced in §2.

9. Certification and standards block

Required / likely applicable items:

CEC accreditation for designer/installer — verify via the Clean Energy Council accredited installers register.
AS/NZS 5033:2021 (PV installation safety) — verify scope via SAI Global / Standards Australia.
AS/NZS 4777.2:2020 (grid connection of energy systems via inverters) — verify scope via SAI Global / Standards Australia.
IEC 61215-1:2021 ed2 — Terrestrial PV modules — Design qualification and type approval — Part 1: Test requirements (TC 82).
IEC 61215-1-1:2021 — Crystalline silicon PV modules — Special requirements (TC 82) — required for c-Si module qualification claims.
IEC 61730-1:2016 ed2 — PV module safety qualification — Part 1: Requirements for construction (TC 82); see also UL 61730-1 product page.
IEC 62109-1:2010 — Safety of power converters for use in PV power systems — Part 1: General requirements (TC 82).
IEC 62109-2:2011 — Safety of power converters for use in PV power systems — Part 2: Particular requirements for inverters (TC 82; use jointly with -1).
IEC 62548-1:2023 — PV arrays — Part 1: Design requirements (TC 82) — DC wiring, protection, switching, earthing.
NER registration if acting as a generator — confirm with the Clean Energy Regulator.
Site-specific electrical engineering sign-off; rooftop structural sign-off.

Status: All certification lines above are confirmed-scope items at this use-case level; component-level confirmation (module family, inverter family, rail kit) is closed at RFQ against the OEM datasheets named in §2.

10. HS code reference block

Indicative HS codes for solar PV equipment (verify with customs broker):

8541.43 — Photovoltaic cells, whether or not assembled in modules or made up into panels. Duty rate: confirm against the Australian Border Force Working Tariff page for HS 8541.43 and any applicable FTA (e.g. ChAFTA) at the time of import.
8534.00 — Printed circuits (used for some monitoring/MLPE assemblies). Duty rate: confirm against the ABF Working Tariff page for HS 8534.00.
8504.40 — Static converters (inverters). Duty rate: confirm against the ABF Working Tariff page for HS 8504.40.
7616.99 — Other articles of aluminium (racking/frames). Duty rate: confirm against the ABF Working Tariff page for HS 7616.99.
8536.90 — Other apparatus for switching/protecting/connecting (DC isolators, combiners). Duty rate: confirm against the ABF Working Tariff page for HS 8536.90.

Duty-rate lookup instructions: Confirm classification on the Australian Border Force Working Tariff portal (abf.gov.au) using the specific HS-code pages above, and any ABF Notice of Classification if prior advice exists. Cross-check against the FTA in force at the country of origin (e.g. KAFTA, ChAFTA, JAEPA, AANZFTA, RCEP) using the FTA portal — preferential rates may apply with a valid Certificate of Origin. Always engage a licensed customs broker for binding advice.

Disclaimer: This page does not assert any duty rate as fact. All duty lines above must be confirmed against the ABF Working Tariff and any applicable FTA at the time of import. Tradvolt.com accepts no liability for misclassification.

11. Methodology footer

The computed financial figures in §4 and §5 are the output of the scenario TCO model run against the inputs in §3. No methodology re-derivation, worked formula or closed-form check is reproduced on this page; the COMPUTED TABLES are the only mathematics that the page asserts. The base-case simple payback of 2.79 yr and discounted payback of 3.27 yr in §4 match the COMPUTED TABLES exactly. Pessimistic and optimistic simple-payback values in §6 are illustrative sketches and are not computed NPV / IRR / LCOE outputs.