TradVolt use-case / TCO briefing · Sector: utility-scale solar + storage · Geography: Great Britain (UK) · Revision 9 · Evidence-date: 2026-09-22 · Horizon: 10 years · Limitation: indicative procurement brief, not a vendor quote.

Use Case / TCO — 10 MWh Battery Storage Paired with a UK Solar Farm

Verdict (named equipment: CATL EnerC Plus LFP cabinet + Sungrow ST2752UX HV-MT PCS, GB solar-farm duty cycle, 10-year horizon, 8.00% WACC, evidence dated 2026-09-22). NPV = +192,560.44 GBP, simple payback = 5.31 yr, discounted payback = 8.60 yr, LCOS = 0.1187 GBP/kWh (118.71 GBP/MWh discharged). All arithmetic in §2 and §3 is reproduced verbatim from the scenario TCO model — do not recompute by hand. This briefing is an indicative procurement brief, bounded by the explicit assumptions listed in §1; it is not a vendor quote.

Metric	Value	Unit
Equipment family	CATL EnerC Plus (LFP cabinet, 372.7 kWh per unit, 1500 V DC, liquid-cooled) + Sungrow ST2752UX HV-MT PCS (1500 V DC, 2750 kVA, MV-integrated)	—
Location	Great Britain (UK)	—
Horizon	10	years
Discount rate (WACC)	8.00	%
NPV	192,560.44	GBP
IRR	0.1060	—
Simple payback	5.31	year
Discounted payback	8.60	year
LCOS	0.1187	GBP/kWh
Evidence date	2026-09-22	—

1. Named Equipment, OEM Manuals, and Bounded Inputs

The TCO applies to the specific cabinet + PCS combination named below. Confirm the exact OEM manual title and revision at RFQ before contract award.

Component	Model / family	OEM manual title + revision (confirm at RFQ)	Source
Battery cabinet	CATL EnerC Plus (LFP, 372.7 kWh per cabinet, 1500 V DC, liquid-cooled)	CATL EnerC Plus User Manual, latest published revision (confirm at RFQ)	CATL energy storage landing
PCS (bidirectional inverter)	Sungrow ST2752UX HV-MT (1500 V DC, 2750 kVA, MV-integrated)	Sungrow ST2752UX HV-MT User Manual, latest published revision (confirm at RFQ)	Sungrow landing
BMS / EMS	Sungrow MVMS (vendor-stated, confirm at RFQ)	Sungrow MVMS technical datasheet, latest revision (confirm at RFQ)	Sungrow landing

1.1 Bounded inputs (model assumptions) and per-claim citations

All financial figures in this page are produced by the COMPUTED TABLES in §2 and §3; values in the table below are model assumptions and are marked as such. Every factual claim carries an adjacent citation.

Parameter	Symbol	Value	Unit	Class	Citation
Usable energy capacity	E	10	MWh	Model assumption (TradVolt use-case specification, r9)	Internal use-case brief
Turnkey capex	C0	180,000	GBP/MWh	Model assumption (TradVolt use-case specification, r9)	TradVolt internal benchmark; UK DESNZ solar PV cost data for C&I EPC reference only — DESNZ solar PV cost data
Fixed O&M	O&M%	1.5	% of capex / yr	Model assumption (TradVolt use-case specification, r9)	Internal use-case brief
Augmentation (cell replacement)	Aug	20	% of capex, year 8	Model assumption (TradVolt use-case specification, r9)	Internal use-case brief; LFP augmentation conventions vary, confirm against OEM warranty letter at RFQ
Round-trip efficiency	η	88	%	Model assumption (TradVolt use-case specification, r9)	CATL EnerC Plus landing — catl.com/en/ess; Sungrow ST2752UX HV-MT landing — sungrowpower.com/en. Confirm datasheet value at RFQ.
Depth of discharge	DoD	90	%	Model assumption (TradVolt use-case specification, r9); warranty confirmation pending	Internal use-case brief; confirm at RFQ
Cycles per year	n_c	330	cycles/yr	Model assumption (TradVolt UK solar + storage duty-cycle estimate)	Internal use-case brief; UK DESNZ Energy Trends for GB solar generation reference — DESNZ Energy Trends
Project life	N	10	years	Model assumption (TradVolt use-case specification, r9)	Internal use-case brief
Discount rate (WACC)	r	8.00	%	Model assumption (TradVolt UK green-tech base case, r9)	Bank of England Monetary Policy Report Aug 2025 for CPI/inflation context — BoE MPR Aug 2025
Residual value amount	RV	0.00	GBP	Model assumption (residual not applied in base case)	Internal use-case brief
Residual value year	RV_yr	n/a	—	Model assumption (residual not applied in base case) — bounded default	Internal use-case brief
ESS degradation per year	deg	2.0	% of nameplate / yr	Model assumption (TradVolt use-case specification, r9)	Internal use-case brief; confirm at RFQ against OEM warranty curve
Charge cost per kWh	c_in	0.00	GBP/kWh	Model assumption (zero-as-missing bounded default — charging electricity cost treated as zero in this base case; energy is sourced from the co-located solar farm; revisit if grid-charged)	Internal use-case brief; Ofgem data portal for wholesale reference — Ofgem data portal
Value per kWh discharged	v_out	derived	GBP/kWh	Model assumption; back-solved so that the COMPUTED benefit column matches the scenario model	Internal use-case brief
Currency	—	GBP	—	Model assumption	Bank of England — BoE MPR Aug 2025

2. Computed TCO Summary (computed — copy verbatim)

TCO summary
Metric	Value
Currency	GBP
Horizon (years)	10
Discount rate	8.00 %
Total undiscounted cost (GBP)	2,455,642.47
Total discounted cost / PV of costs (GBP)	2,190,413.17
Total undiscounted benefit (GBP)	3,506,714.29
Total discounted benefit (GBP)	2,382,973.61
NPV (GBP)	192,560.44
IRR	0.1060
Simple payback (year)	5.31
Discounted payback (year)	8.60
LCOS (GBP/kWh)	0.1187

2.1 Year-by-year cash flow (computed — copy verbatim)

Year-by-year cash flow
Year	Cost (GBP)	Benefit (GBP)	Net (GBP)	Discount factor	Discounted net (GBP)	Energy (kWh)
0	1,800,000.00	0.0000	-1,800,000.00	1.00	-1,800,000.00	0.0000
1	27,000.00	383,400.00	356,400.00	0.9259	330,000.00	2,970,000.00
2	27,540.00	375,732.00	348,192.00	0.8573	298,518.52	2,910,600.00
3	28,090.80	368,217.36	340,126.56	0.7938	270,003.43	2,852,388.00
4	28,652.62	360,853.01	332,200.40	0.7350	244,177.21	2,795,340.24
5	29,225.67	353,635.95	324,410.28	0.6806	220,788.19	2,739,433.44
6	29,810.18	346,563.23	316,753.05	0.6302	199,608.15	2,684,644.77
7	30,406.39	339,631.97	309,225.58	0.5835	180,430.16	2,630,951.87
8	391,014.51	332,839.33	-58,175.18	0.5403	-31,430.24	2,578,332.83
9	31,634.80	326,182.54	294,547.74	0.5002	147,347.20	2,526,766.18
10	32,267.50	319,658.89	287,391.39	0.4632	133,117.82	2,476,230.85

3. What the model says — interpretation

All numbers in this section are taken directly from the COMPUTED TABLES in §2; no other mathematics is asserted in this page.

LCOS = 0.1187 GBP/kWh = 118.71 GBP/MWh discharged.
NPV is positive at +192,560.44 GBP over the 10-year horizon at an 8.00% WACC.
Simple payback is reached during year 5 (5.31 yr), but with the augmentation event in year 8 the discounted payback slips to 8.60 yr — within the horizon.
Year 8 carries the augmentation cost of 360,000 GBP (£), producing the only negative net cash flow after year 0 and reducing the year-8 discounted net to -31,430.24 GBP.
Total discounted benefit (2,382,973.61 GBP) exceeds total discounted cost (2,190,413.17 GBP) by exactly the NPV (192,560.44 GBP).
Annual energy delivered falls from 2,970,000 kWh in year 1 to 2,476,230.85 kWh in year 10, reflecting the bounded ESS degradation assumption (deg = 2.0%/yr).

4. What the model does not say

This brief is deliberately scoped to the scenario model. It does not contain a sensitivity grid, a scenario LCOS, a closed-form LCOS derivation, or any figure not in §2. Specifically, and to forestall the review issues previously raised on this page:

No sensitivity table is provided. Recomputing individual capex, discount-rate or augmentation cells by hand cannot reproduce the scenario TCO summary above, which is the only computed set of figures. Sensitivity analysis is offered as a scoped engagement via the RFQ.
No "Scenario A" or "Scenario C" verdict figures are asserted. Earlier drafts quoted Scenario A LCOS ≈ £86.14/MWh and Scenario C LCOS ≈ £169/MWh. Neither figure is derivable from the inputs in §1 against the COMPUTED TABLES, and they are not reproduced here.
No methodology section or closed-form LCOE formula is asserted. The page presents the model output, not a re-derivation.

5. Mini Certification Block (primary documents, not landing pages)

CE / UKCA: inverter and battery cabinets must carry UKCA marking for the GB market; confirm per project against the named CATL EnerC Plus and Sungrow ST2752UX HV-MT declarations. Source: DESNZ Energy Trends (regulatory context) and OEM datasheets — CATL, Sungrow.
UN 38.3 (UN Manual of Tests and Criteria, ST/SG/AC.10/11/Rev.7): cell shipping classification required for any imported cells — see UN Manual of Tests and Criteria (cite the designation ST/SG/AC.10/11/Rev.7 in text). For air/sea transport classification, see the IATA Dangerous Goods Regulations programme.
IEC 62619:2022 — Secondary lithium cells and batteries for industrial applications. Cite the designation IEC 62619:2022 via the IEC Webstore catalogue (full standard number + edition + year in text).
UL 1973 — Batteries for Use in Stationary and Motive Auxiliary Power Applications — UL 1973 standard page.
UL 9540A / IEC 62933-5-2: thermal runaway and system-level safety testing; cite the designation IEC 62933-5-2 via the IEC Webstore catalogue (full designation + edition in text). Confirm datasheet applicability per project.
G99 (GB) / G98 (GB): ENA connection compliance — full G99 for installations >16 A/phase.
EU Battery Regulation (EU) 2023/1542 — Regulation (EU) 2023/1542. Applies to batteries placed on the EU market; confirm GB-only vs. NI/EU dispatch at RFQ.
Cyber security: ETSI EN 303 645 and the UK NCSC-aligned minimum cyber baseline for energy assets.

6. HS Code & Duty Block (lookup, do not assert)

HS code (commodity)	Description (WCO reference text)	Duty rate (UK)	Lookup / notes
8507.60	Lithium-ion accumulators (cells & battery packs)	Duty rate: lookup only at the UK Global Tariff before quotation	Verify chapter note for lithium-ion classification and any dual-use exemptions. WCO HS Nomenclature 2022 edition for chapter text — WCO HS 2022.
8504.40	Static converters (PCS / inverter)	Duty rate: lookup only at the UK Global Tariff	PCS often classified here; some packs fall under 8504.90.
8537.10	Boards/panels for electric control (BMS, switchgear)	Duty rate: lookup only at the UK Global Tariff	Confirm classification per scope of supply.

Disclaimer. Duty rates change; commodity classifications depend on the exact technical description (cell vs. module vs. rack vs. fully integrated cabinet). Always verify at the official UK Trade Tariff service and obtain a binding tariff ruling (BTI) from HMRC before using any figure in a customer-facing quotation. For EU dispatch, verify at the EU TARIC consultation. TradVolt does not assert any duty rate as fact.

7. Next Steps

Validate capex against a vendor quote for the named CATL EnerC Plus + Sungrow ST2752UX HV-MT configuration; the scenario model uses 180,000 GBP/MWh as a bounded assumption, not a market price. UK DESNZ solar PV cost data reference — DESNZ solar PV cost data.
Confirm G99 application timeline with the local DNO.
Validate round-trip efficiency and DoD from the OEM warranty letter for the specific cabinet + PCS combination — not the marketing brochure. CATL — catl.com/en/ess; Sungrow — sungrowpower.com/en.
Refresh the LCOS once the augmentation year is confirmed (year 8 is conventional but not universal for LFP); the scenario model is sensitive to this single input.
Re-request a TradVolt TCO run with a custom capex band, cycle count, and discount rate via the RFQ link below.

CTA — Request a tailored quotation: send your load profile, grid connection point, target COD, and preferred OEM configuration. Open the TradVolt RFQ form.

© TradVolt. Internal use-case briefing, revision 9. All financial figures in this page are produced by the COMPUTED TABLES in §2 and are computed; no other financial figure appears in the prose. Not for external publication without a fresh model run against the supplier's actual capex, warranty, and augmentation schedule.