B2B TCO / Landed Cost CN → Slovenia Vertical: Solar BoS Use-case: Hangar rooftop, 50 kW
| Decision metric | Value | Unit |
|---|---|---|
| Equipment | On-grid string inverter, 50 kW three-phase (reference: Sungrow SG50CX; alternative: Huawei SUN2000-50KTL-M3) | — |
| Location | Slovenia (CN → Koper/Ljubljana) | — |
| Horizon | 25 | years |
| Discount rate | 8.00 | % |
| NPV | 53,092.62 | EUR |
| IRR | 0.1546 | — |
| Simple payback | 6.58 | year |
| Discounted payback | 9.53 | year |
| LCOE | 0.1259 | EUR/kWh |
| Evidence-date | 2026-09-21 | — |
This page is a buyer-side TCO and landed-cost framework for sourcing a three-phase 50 kW on-grid string inverter from Chinese OEMs to a hangar rooftop in Slovenia. The reference equipment candidate is the Sungrow SG50CX; the Huawei SUN2000-50KTL-M3 is offered as an alternative at RFQ stage. CapEx, OpEx, NPV, IRR, payback and LCOE are taken from the scenario TCO model. EU duty and Slovenian VAT are HS-code-dependent and remain PENDING — lookup against TARIC and FURS at quote stage.
Request Quote — replies in 48h Open RFQ form
A hangar is a large, low-rise steel building with a long, mostly unobstructed roof surface. In Slovenia, commercial-scale rooftop PV typically connects to the low-voltage three-phase 400 V grid via the local DSO in SODO-eligible areas. A single 50 kW three-phase string inverter is a standard building block for commercial BoS in this power class.
Final sizing depends on PV array DC capacity, string configuration and the project-specific DSO connection offer.
| Item | Value | Source |
|---|---|---|
| Product type | On-grid / grid-tied solar PV inverter (string topology, transformerless) | Sungrow SG50CX datasheet (2023-12-19 rev.) |
| Reference candidate | Sungrow SG50CX — 50 kW three-phase string inverter | https://www.sungrowpower.com/UploadFile/file/20231219/20231219100826_10304.pdf |
| Alternative candidate | Huawei SUN2000-50KTL-M3 — 50 kW three-phase string inverter | https://solar.huawei.com/en-Hans/download?p=%2Fproducts%2FfusionSolar%2Fsun2000-50ktl-m3 |
| AC nominal output | 50 kW | Sungrow SG50CX datasheet, p.2; Huawei SUN2000-50KTL-M3 datasheet |
| Phases / grid | 3-phase, 400 V AC (Slovenia low-voltage) | Sungrow SG50CX datasheet, p.2; SODO connection-rules document |
| Topology | Transformerless | Sungrow SG50CX datasheet, p.1 |
| MPPT inputs | 5 MPPT (SG50CX) / 4 MPPT (SUN2000-50KTL-M3) | OEM datasheets |
| Typical use | Commercial / industrial rooftop PV (hangar) BoS | Sungrow SG50CX datasheet, p.1 |
| Origin | China (CN-OEM) | Manufacturer websites |
| Destination | Slovenia (EU) | SODO |
| Metric | Value |
|---|---|
| Currency | EUR |
| Horizon (years) | 25 |
| Discount rate | 8.00 % |
| Total undiscounted cost (EUR) | 118,045.45 |
| Total discounted cost / PV of costs (EUR) | 89,011.05 |
| Total undiscounted benefit (EUR) | 352,195.86 |
| Total discounted benefit (EUR) | 142,103.67 |
| NPV (EUR) | 53,092.62 |
| IRR | 0.1546 |
| Simple payback (year) | 6.58 |
| Discounted payback (year) | 9.53 |
| LCOE (EUR/kWh) | 0.1259 |
| Year | Cost (EUR) | Benefit (EUR) | Net (EUR) | Discount factor | Discounted net (EUR) | Energy (kWh) |
|---|---|---|---|---|---|---|
| 0 | 70,000.00 | 0.0000 | -70,000.00 | 1.00 | -70,000.00 | 0.0000 |
| 1 | 1,500.00 | 11,730.00 | 10,230.00 | 0.9259 | 9,472.22 | 69,000.00 |
| 2 | 1,530.00 | 11,904.78 | 10,374.78 | 0.8573 | 8,894.70 | 68,655.00 |
| 3 | 1,560.60 | 12,082.16 | 10,521.56 | 0.7938 | 8,352.35 | 68,311.73 |
| 4 | 1,591.81 | 12,262.18 | 10,670.37 | 0.7350 | 7,843.04 | 67,970.17 |
| 5 | 1,623.65 | 12,444.89 | 10,821.24 | 0.6806 | 7,364.75 | 67,630.32 |
| 6 | 1,656.12 | 12,630.32 | 10,974.20 | 0.6302 | 6,915.61 | 67,292.16 |
| 7 | 1,689.24 | 12,818.51 | 11,129.27 | 0.5835 | 6,493.82 | 66,955.70 |
| 8 | 1,723.03 | 13,009.51 | 11,286.48 | 0.5403 | 6,097.73 | 66,620.92 |
| 9 | 1,757.49 | 13,203.35 | 11,445.86 | 0.5002 | 5,725.78 | 66,287.82 |
| 10 | 1,792.64 | 13,400.08 | 11,607.44 | 0.4632 | 5,376.49 | 65,956.38 |
| 11 | 1,828.49 | 13,599.74 | 11,771.25 | 0.4289 | 5,048.49 | 65,626.60 |
| 12 | 1,865.06 | 13,802.37 | 11,937.31 | 0.3971 | 4,740.47 | 65,298.47 |
| 13 | 1,902.36 | 14,008.03 | 12,105.67 | 0.3677 | 4,451.23 | 64,971.97 |
| 14 | 1,940.41 | 14,216.75 | 12,276.34 | 0.3405 | 4,179.62 | 64,647.11 |
| 15 | 1,979.22 | 14,428.58 | 12,449.36 | 0.3152 | 3,924.56 | 64,323.88 |
| 16 | 2,018.80 | 14,643.56 | 12,624.76 | 0.2919 | 3,685.05 | 64,002.26 |
| 17 | 2,059.18 | 14,861.75 | 12,802.57 | 0.2703 | 3,460.14 | 63,682.25 |
| 18 | 2,100.36 | 15,083.19 | 12,982.83 | 0.2502 | 3,248.94 | 63,363.84 |
| 19 | 2,142.37 | 15,307.93 | 13,165.56 | 0.2317 | 3,050.62 | 63,047.02 |
| 20 | 2,185.22 | 15,536.02 | 13,350.80 | 0.2145 | 2,864.39 | 62,731.78 |
| 21 | 2,228.92 | 15,767.51 | 13,538.59 | 0.1987 | 2,689.52 | 62,418.12 |
| 22 | 2,273.50 | 16,002.44 | 13,728.94 | 0.1839 | 2,525.31 | 62,106.03 |
| 23 | 2,318.97 | 16,240.88 | 13,921.91 | 0.1703 | 2,371.11 | 61,795.50 |
| 24 | 2,365.35 | 16,482.87 | 14,117.52 | 0.1577 | 2,226.32 | 61,486.52 |
| 25 | 2,412.66 | 16,728.46 | 14,315.81 | 0.1460 | 2,090.36 | 61,179.09 |
asset.pv.degradation_pct_per_year = 0.50 %/yr (linear annual module degradation; consistent with Sungrow PV module warranty terms referenced in the SG50CX datasheet pack). Bounded by [0.0, 1.5] %/yr.asset.pv.tariff_escalation_pct = 1.50 %/yr (annual self-consumed/exported tariff escalation, nominal). Bounded by [0.0, 5.0] %/yr.residual_value.amount = 0 EUR (no terminal salvage value booked; inverter replaced in year 25).residual_value.year = 25 (end of horizon).| Candidate | Family / Model | Public source |
|---|---|---|
| Primary reference | Sungrow SG50CX (50 kW, 3-phase 400 V, transformerless, 5 MPPT) | Sungrow SG50CX datasheet: https://www.sungrowpower.com/UploadFile/file/20231219/20231219100826_10304.pdf |
| Alternative reference | Huawei SUN2000-50KTL-M3 (50 kW, 3-phase 400 V, transformerless, 4 MPPT) | Huawei SUN2000-50KTL-M3 product page: https://solar.huawei.com/en-Hans/products/FusionSolar/SUN2000-50KTL-M3 |
| Product family (Sungrow commercial string) | Sungrow SGxxCX commercial string series | https://www.sungrowpower.com/Product/index/id/3.html |
| Product family (Huawei commercial string) | Huawei SUN2000-50/60KTL-M3 commercial series | https://solar.huawei.com/en-Hans/Products/FusionSolar |
Final OEM model and serial confirmed per datasheet and Declaration of Conformity delivered with the RFQ response. No certificate number, OEM logo or marketing claim is asserted on this page.
| Requirement | What to check | Reference document |
|---|---|---|
| CE marking (EU) | CE mark + EU Declaration of Conformity referencing LVD, EMC, RoHS | EU Regulation (EU) 2019/1020 (market surveillance) — EUR-Lex: https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX:32019R1020 |
| Safety of PV power converters | EN / IEC 62109-1 and 62109-2 referenced on datasheet / DoC | IEC 62109-1:2010 product page: https://webstore.iec.ch/publication/6451 ; IEC 62109-2:2011 product page: https://webstore.iec.ch/publication/6452 |
| Utility interconnect characteristics | IEC 61727 referenced on datasheet / DoC | IEC 61727:2004 product page: https://webstore.iec.ch/publication/2411 |
| Anti-islanding protection | IEC 62116 referenced on datasheet / DoC | IEC 62116:2014 product page: https://webstore.iec.ch/publication/22281 |
| Slovenian grid compliance | Conformance with project-specific SODO connection requirements | SODO Sistemska obratovalna navodila: https://www.sodo.si/dokumenti/Sistemska_obratovalna_navodila_za_prenosni_eles_in_distribucijski_sistem.pdf |
| Product warranty | Years and conditions stated on datasheet | Sungrow SG50CX datasheet, p.1 (5-year standard, extendable to 10 years) |
PENDING — lookup. The official sources of truth are the EU TARIC consultation (per HS code) and the Slovenian Customs Administration (FURS — Finančna uprava Republike Slovenije). The HS code for the inverter must be confirmed before any rate is applied.| Component | Base | Rate | As-of | Source of truth |
|---|---|---|---|---|
| EU import duty (Slovenia) | CIF value | PENDING — lookup | 2026-09-21 | EU TARIC measure query (CN 2026-09-21): https://ec.europa.eu/taxation_customs/dds2/taric/measures.html?codes=850440 ; EU TARIC consultation: https://ec.europa.eu/taxation_customs/dds2/taric/taric_consultation.jsp |
| Anti-dumping / safeguard measures (if applicable to the HS code) | CIF value | PENDING — lookup | 2026-09-21 | DG TAXUD Trade defence measures page: https://policy.trade.ec.europa.eu/enforcement-and-protection/trade-defence_en |
| Slovenian VAT (DDV) | Customs value + duty | PENDING — lookup | 2026-09-21 | FURS DDV rate publication: https://www.fu.gov.si/davki_in_druge_dajatve/podrocja/ddv/ddv_znacilne_stopnje/ ; Slovenian VAT Act (ZDDV-1): https://www.uradni-list.si/glasilo-uradni-list-rs/vsebina/2006-01-4096 |
| Excise / environmental levies | n/a for solar inverter | Not applicable — confirm | 2026-09-21 | FURS Customs tariff & levies: https://www.fu.gov.si/carinske_dajatve/ |
HS-code-dependent: the rate for static converters (which includes grid-tied PV inverters) is HS-code-dependent and may be subject to anti-dumping or surveillance measures for specific sub-codes. Always re-check TARIC at quote stage.
Submit the form below. tradvolt replies within 48 hours with an OEM shortlist, indicative FOB/CIF/DAP Slovenia price range and a working datasheet. No payment is taken at this stage.
Or open the standard RFQ form: /rfq/.
Yes. A 50 kW three-phase string inverter (e.g. Sungrow SG50CX) is a standard commercial-scale building block. Final sizing must be validated against array kWp and the project-specific SODO connection offer. [Src: Sungrow SG50CX datasheet, https://www.sungrowpower.com/UploadFile/file/20231219/20231219100826_10304.pdf accessed 2026-09-21]
Verify CE marking and references to IEC 62109-1/-2 (safety), IEC 61727 (utility interface) and IEC 62116 (anti-islanding) on the datasheet and Declaration of Conformity. Slovenian grid compliance is project-specific. [Src: IEC webstore publication pages, https://webstore.iec.ch/publication/6451 ; https://webstore.iec.ch/publication/6452 ; https://webstore.iec.ch/publication/2411 ; https://webstore.iec.ch/publication/22281 accessed 2026-09-21]
The stack is built on the EU TARIC / Slovenian national line for the inverter HS code. Official portals: European Commission TARIC consultation and FURS. Until the exact HS code is verified, every duty and VAT rate on this page is marked PENDING — lookup. [Src: EU TARIC consultation, https://ec.europa.eu/taxation_customs/dds2/taric/taric_consultation.jsp ; FURS, https://www.fu.gov.si/ accessed 2026-09-21]
Over 25 years at an 8% discount rate: NPV = EUR 53,092.62; simple payback = 6.58 yr; discounted payback = 9.53 yr; LCOE = EUR 0.1259/kWh; IRR = 15.46%. Subject to the bounded defaults in §5.
Yes. RFQs can be issued on EXW, FOB, CIF, DAP Slovenia and DDP Slovenia. The OEM datasheet and Declaration of Conformity are delivered with the RFQ response.
Excludes PV modules, racking, DC cabling, AC balance-of-system, SODO connection fees, structural reinforcement for the hangar roof, and any anti-dumping or safeguard measures that may apply at import.