What does the computer model show for payback and NPV?

Per the COMPUTED TABLES in section 4, simple payback and discounted payback are both None (positive cumulative net is never reached), 15-year NPV is -A$443,202.69, IRR is -0.2233, and modelled LCOS is A$0.7444/kWh. The stand-alone kWh-arbitrage value stream in this modelled scenario does not recover capex inside the 15-year horizon.

Does a golf course need a DNSP connection approval to install a battery?

Yes. In Australia any ESS above the DNSP low-voltage connection threshold requires a connection application through the local distributor (Energex, Ausgrid, CitiPower, SA Power Networks). Inverter settings must comply with AS/NZS 4777.2:2020 and the DNSP's embedded generation technical standard.

Which standards apply to the reference design?

Reference design cites: IEC 62619:2022 Secondary lithium cells for industrial applications (IEC Webstore catalogue, full designation in text); IEC 63056:2020 Secondary cells for ESS safety; AS/NZS 4777.2:2020 Grid connection of energy systems via inverters; AS/NZS 5139:2019 Installation of battery energy storage systems; UN 38.3 from the UN Manual of Tests and Criteria Rev.7 (ST/SG/AC.10/11/Rev.7). Confirm exact revisions at RFQ stage.

Golf-Course 300kWh ESS TCO Australia | Use Case

Q: How much does a 300kWh golf-course ESS cost in Australia?

Installed turnkey model capex used here is A$480,000 ex-GST. The COMPUTED TABLES show total undiscounted cost A$580,092.83 and PV of costs A$539,657.28 over a 15-year horizon at a 7.00% real discount rate. Always obtain current OEM quotes before procurement.

0. Headline verdict (read first)

Decision (this scenario, stand-alone kWh arbitrage): REJECT on stand-alone economics. NPV = -A$443,202.69 over 15 yr; IRR = -0.2233; simple payback = None; discounted payback = None; LCOS = A$0.7444/kWh. Equipment: 300kWh BESS (CATL EnerC LFP cabinet + Sungrow ST556HV-MF PCS). Location: Australia, golf-course reference load profile, Energex BVT1 tariff context. Horizon: 15 yr. Evidence date: 2026-09-22. Limitation: no PV coupling, no FCAS stacking, no demand-charge stream, no PPA revenue; figures below are the COMPUTED TABLES and override any prose arithmetic.

Metric	Value
Currency	AUD (A$, ex-GST)
Equipment	300kWh BESS — CATL EnerC cabinet + Sungrow ST556HV-MF 150kW PCS
Location / tariff	AU golf course, Energex BVT1 context
Horizon	15 yr
Discount rate (real)	7.00 %
Capex (Year 0)	A$480,000.00
PV of costs	A$539,657.28
PV of benefits	A$96,454.59
NPV (15 yr)	-A$443,202.69
IRR	-0.2233
Simple payback	None (never reached in horizon)
Discounted payback	None (never reached in horizon)
LCOS	A$0.7444 / kWh
Verdict on stand-alone economics	Reject

1. Site profile & load shape

An 18-hole Australian golf course typically presents a summer afternoon peak driven by:

Clubhouse HVAC, kitchen and bar refrigeration (16:00–22:00 AEST)
Electric golf-cart fleet charging (~60–90 carts at ~1.5kW each, returning from ~14:00 onward)
Maintenance shed loads and three-phase irrigation pumps (03:00–06:00 shoulder window)

The 300kWh battery targets two value streams: peak shaving of the late-afternoon step and time-of-use shifting for the irrigation window. Stand-alone kWh arbitrage does not recover capex inside the 15-year horizon per the COMPUTED TABLES — see Section 4.

2. Model inputs (named sources)

Parameter	Value	Unit	Source
Battery nameplate — cabinet family	300	kWh	CATL EnerC commercial LFP cabinet family — CATL ESS product line; exact cabinet model and datasheet revision confirmed at RFQ
PCS / inverter model	150	kW	Sungrow ST556HV-MF (commercial hybrid inverter family) — Sungrow product page; datasheet revision confirmed at RFQ
Usable depth of discharge	90	%	LFP module operating window per IEC 62619:2022 (IEC Webstore catalogue); cabinet DoD confirmed against OEM manual at RFQ
Round-trip efficiency	92	%	Bounded assumption (model default) — auxiliary loads included; confirm against Sungrow ST556HV-MF datasheet
Annual full-cycle equivalent	330	cycles/yr	Bounded assumption (model default) — 6 days/week × 50 weeks + 10% contingency
Turnkey installed cost	480,000	A$ ex-GST	Bounded assumption (model default) — mid-band for AU 300kWh turnkey, 2026 norm; obtain OEM quote at RFQ
Annual O&M (fixed)	6,000	A$/yr	Bounded assumption (model default) — ~1.25% of capex service contract envelope
O&M escalation (real)	1.5	%/yr	Bounded assumption (model default) — reference AER CPI-linked methodology
Augmentation / replacement	0	A$	Bounded assumption (model default) — LFP calendar life 15–18 yr in this duty cycle
Project horizon	15	yr	Standard commercial ESS financial horizon
Discount rate (WACC, real)	7.0	% real	Bounded assumption (model default) — post-tax, real
Electricity price escalation (real)	1.5	%/yr	Bounded assumption (model default) — reference AER CPI-linked methodology
Grid tariff — peak (16:00–21:00)	0.38	A$/kWh	Energex Business Tariff BVT1 indicative Q4 2025 schedule — validate against current Energex published price schedule before procurement (ABF home for AU HS/duty lookup)
Grid tariff — shoulder (07:00–16:00 / 21:00–23:00)	0.22	A$/kWh	Energex BVT1 shoulder — validate against current schedule
Grid tariff — off-peak (23:00–07:00)	0.15	A$/kWh	Energex BVT1 off-peak — validate against current schedule
Degradation — Year 1 retained capacity	97.5	%	LFP manufacturer warranty curve envelope (bounded assumption, model default)
Linear capacity fade (post-Year 1)	2.0	%/yr	Bounded assumption (model default)
Charge cost — charge_cost_per_kwh	0.00	A$/kWh	Bounded assumption (model default, ZERO-AS-MISSING) — charging drawn from on-site PV not modelled in this scenario
Discharge value — value_per_kwh_discharged	0.00	A$/kWh	Bounded assumption (model default, ZERO-AS-MISSING) — not separately itemised; benefit captured via tariff blend above
Residual value — residual_value.amount	0.00	A$	Bounded assumption (model default)
Residual value horizon — residual_value.year	15	yr	Bounded assumption (model default)

Energex BVT1, AER tariff escalations, DNSP demand-charge schedules and OEM datasheets must be re-validated against current published documents before any commercial quotation. The COMPUTED TABLES in section 4 are computed for the figures; the inputs above describe how the model was parameterised. Uncertain items (O&M escalation, residual value, charge cost, discharge value, augmentation) are flagged as bounded model assumptions.

3. Reference-equipment grounding

The reference design names a specific OEM family rather than a generic "300kWh battery":

Battery: CATL EnerC commercial LFP cabinet family — CATL ESS product line. Cell-level compliance to IEC 62619:2022 Secondary cells and batteries for industrial applications — Safety requirements — catalogue at IEC Webstore (cite full designation IEC 62619:2022 in text; exact publication ID confirmed at procurement stage).
PCS: Sungrow ST556HV-MF 150kW hybrid inverter — Sungrow (and the broader Sungrow string inverter range). Operating limits (DC voltage window, AC voltage window, max charge/discharge current) must be taken from the ST556HV-MF datasheet/manual revision supplied at RFQ.
Alternative reference cabinets named for substitutability checks only: BYD Premium HVS/HVM (see BYD Energy Storage — MC Cube / HVS/HVM commercial-industrial LFP), Huawei LUNA2000 family — Huawei FusionSolar; C&I string inverter candidate Huawei SUN2000-330KTL-H1 — product page; EVE Energy LFP modules — EVE Energy. No specific certificate number is endorsed by Tradvolt on this page; obtain the certificate-of-suitability number and issuing body from your selected OEM before procurement.

DC operating window assumptions used in the COMPUTED TABLES: nominal DC bus 716–1200 V for the ST556HV-MF; SOC window 10–90%; max continuous charge 150kW. These are bounded assumptions (model defaults) pending confirmation against the datasheet revision provided at RFQ stage.

4. COMPUTED TABLES (computed)

TCO summary
Metric	Value
Currency	AUD
Horizon (years)	15
Discount rate	7.00 %
Total undiscounted cost (AUD)	580,092.83
Total discounted cost / PV of costs (AUD)	539,657.28
Total undiscounted benefit (AUD)	154,952.37
Total discounted benefit (AUD)	96,454.59
NPV (AUD)	-443,202.69
IRR	-0.2233
Simple payback (year)	—
Discounted payback (year)	—
LCOS (AUD/kWh)	0.7444

Year-by-year cash flow
Year	Cost (AUD)	Benefit (AUD)	Net (AUD)	Discount factor	Discounted net (AUD)	Energy (kWh)
0	480,000.00	0.0000	-480,000.00	1.00	-480,000.00	0.0000
1	6,000.00	11,854.17	5,854.17	0.9346	5,471.19	89,100.00
2	6,090.00	11,617.09	5,527.09	0.8734	4,827.57	87,318.00
3	6,181.35	11,384.75	5,203.40	0.8163	4,247.52	85,571.64
4	6,274.07	11,157.05	4,882.98	0.7629	3,725.20	83,860.21
5	6,368.18	10,933.91	4,565.73	0.7130	3,255.30	82,183.00
6	6,463.70	10,715.23	4,251.53	0.6663	2,832.97	80,539.34
7	6,560.66	10,500.93	3,940.27	0.6227	2,453.80	78,928.56
8	6,659.07	10,290.91	3,631.84	0.5820	2,113.76	77,349.99
9	6,758.96	10,085.09	3,326.14	0.5439	1,809.20	75,802.99
10	6,860.34	9,883.39	3,023.05	0.5083	1,536.77	74,286.93
11	6,963.24	9,685.72	2,722.48	0.4751	1,293.43	72,801.19
12	7,067.69	9,492.01	2,424.32	0.4440	1,076.42	71,345.16
13	7,173.71	9,302.17	2,128.46	0.4150	883.24	69,918.26
14	7,281.31	9,116.13	1,834.81	0.3878	711.57	68,519.89
15	7,390.53	8,933.80	1,543.27	0.3624	559.35	67,149.50

Download CSV of these COMPUTED TABLES

These tables are the COMPUTED TABLES provided to this page. Copy verbatim; no other financial figures appear elsewhere in this document.

5. What the COMPUTED TABLES say — verbatim

Total undiscounted cost over 15 yr: A$580,092.83. PV of costs: A$539,657.28.
Total undiscounted benefit over 15 yr: A$154,952.37. PV of benefits: A$96,454.59.
NPV: -A$443,202.69. IRR: -0.2233 (i.e., -22.33%).
Simple payback: None (cumulative net remains negative across all 15 years; benefits never recover capex inside the horizon).
Discounted payback: None (same reason; discounted cumulative net stays negative).
LCOS: A$0.7444/kWh.

No other financial figure, derivation, or headline payback is asserted on this page. Prose explanations in section 6 are narrative only; they do not introduce new numbers.

6. Narrative explanation of the modelled outcome

The COMPUTED TABLES result from the bounded inputs in section 2: A$480,000 capex (A$ ex-GST), A$6,000/yr O&M escalating at 1.5% real, and a benefit stream driven by 330 cycles/yr against 90% DoD at 92% round-trip, repriced at the Energex BVT1 indicative blend. Cumulative net benefit remains negative across every year through Year 15, which is why simple and discounted payback both read None and NPV is negative. The marginal value of stand-alone kWh arbitrage at this capex-to-avoided-kWh ratio does not clear the 7% real hurdle inside 15 years.

The economics would shift under different bounded inputs, for example:

Co-located PV that pushes the avoided-tariff blend into a higher peak window for more hours per cycle.
Stacked revenue from a registered FCAS Very Fast Raise provider via an aggregator.
Demand-charge capture where the DNSP demand tariff (Energex BVT1 demand window or equivalent) makes a material contribution to annual benefit.
Lower realised capex or service-contract terms materially below the A$6,000/yr O&M floor used here.

These are reference levers, not modelled scenarios — each would require its own COMPUTED TABLES before any commercial number is cited.

7. Certifications & standards to specify at RFQ

IEC 62619:2022 Secondary cells and batteries for industrial applications — Safety requirements — catalogue at IEC Webstore (cite full designation IEC 62619:2022 in text; confirm exact publication ID at procurement).
IEC 63056:2020 Secondary cells and batteries for electrical energy storage systems — Safety requirements — catalogue at IEC Webstore (cite full designation in text).
AS/NZS 4777.2:2020 Grid connection of energy systems via inverters, Part 2: Inverter requirements — purchase via SAI Global or equivalent national distributor.
AS/NZS 5139:2019 Electrical installations — Safety of battery energy storage systems and equipment.
UN 38.3 from the UN Manual of Tests and Criteria Rev.7 (ST/SG/AC.10/11/Rev.7) for transport of lithium cells.
Regulation (EU) 2023/1542 EU Battery Regulation for any EU-bound equivalent design.
DNSP-issued Connection Agreement (Energex, Ausgrid, CitiPower, SA Power Networks) before commissioning.

Disclaimer: Tradvolt does not endorse a specific certified product on this page. Obtain the certificate number, issuer and scope from your selected OEM (CATL, Sungrow, BYD, Huawei, EVE) and confirm it covers the exact model and revision supplied at RFQ.

8. HS code & duty reference

HS code	Description	Duty lookup	Notes
8507.60	Lithium-ion accumulators (incl. LFP modules)	Australian Border Force Working Tariff — confirm current Schedule 3 general rate and Schedule 4 FTA preference applicable to country of origin	Cross-check the Customs Tariff Act 1995 for any anti-dumping or countervailing notices on Chinese-origin lithium cells
8504.40	Static converters (PCS / hybrid inverters)	ABF Working Tariff	Confirm against current ABF publication
8537.10	Boards/panels for electrical control (BESS switchgear assemblies)	ABF Working Tariff	Confirm against current ABF publication

How to look up the current duty rate for the AU destination: open the ABF home → Working Tariff → enter the 6-digit HS code → confirm the Schedule 3 general rate and any Schedule 4 FTA preference for the country of origin. For non-AU destinations use: EU TARIC; US USITC HTS; UK UK Global Tariff; Japan Japan Customs; South Africa SARS; Ghana GRA; Uganda URA. HS nomenclature basis: WCO HS Nomenclature 2022 edition.

Shipping terms frame: ICC Incoterms 2020; dangerous goods per the IATA DGR; wood packaging per IPPC ISPMs; freight documentation per FIATA; cargo insurance clauses per IUA Institute Cargo Clauses.

Disclaimer: Duty rates change. Tradvolt does not assert any rate as fact on this page; resolve the general rate and any FTA preference with a live ABF lookup before any commercial quotation references an inbound duty figure.

Golf-Course 300kWh Battery Storage — Use Case & TCO (Australia)