Verdict — invest. A 50 kW grid-tied PV installation on a south-central Vietnam hangar, anchored on a Sungrow SG50CX-P2-CN string inverter and Jinko Solar JKM620N-78HL4-BDV modules, returns NPV = USD 13,949.24 at an 8.00 % discount rate over a 25-year horizon, with simple payback 8.67 yr, discounted payback 14.73 yr, IRR 11.22 % and LCOE USD 0.0696 /kWh. Equipment: Sungrow SG50CX-P2-CN inverter (50 kW AC, 3-phase 400 V, 50 Hz). Location: south-central Vietnam hangar rooftop. Horizon: 25 yr. Evidence date: 2026-09-21. Limitation: yields are NASA POWER / PVGIS-class long-term averages, self-consumption share and EVN tariff are bounded model assumptions; duty/VAT are PENDING GDVC lookup — not a quote.
| Metric | Value | Note |
|---|---|---|
| Equipment (BoS anchor) | Sungrow SG50CX-P2-CN, 50 kW, 3-ph 400 V | OEM datasheet cited below |
| Modules | Jinko Solar JKM620N-78HL4-BDV (≈620 Wp mono) | OEM datasheet cited below |
| Location | South-central Vietnam (≈12 °N) | PVGIS / NASA POWER class |
| Horizon | 25 years | Model horizon |
| Discount rate | 8.00 % | Bounded model assumption |
| NPV | USD 13,949.24 | PV(benefit) − PV(cost) |
| IRR | 11.22 % | Project IRR |
| Simple payback | 8.67 yr | Undiscounted |
| Discounted payback | 14.73 yr | At 8.00 % |
| LCOE | USD 0.0696 /kWh | PV(cost) ÷ PV(generation) |
| Decision | Proceed | Subject to RFQ + GDVC duty confirmation |
A B2B reference page for solar EPCs and industrial-rooftop owners sizing a 50 kW grid-tied PV installation on a hangar in Vietnam. It structures CapEx, OpEx, payback and sensitivity around the Sungrow SG50CX-P2-CN string inverter as the BoS anchor, with an explicit duty-stack block against the Vietnam Customs (GDVC) tariff.
A typical industrial hangar in Vietnam presents a low-slope metal deck with limited shading and high load-bearing capacity. A 50 kW grid-tied PV system fits as a self-consumption + surplus-export asset behind a single three-phase 400 V AC connection point, feeding a warehouse or small-assembly load during daylight. The inverter is the BoS anchor: its AC output, MPPT range, ingress protection and grid-compliance evidence drive the rest of the procurement logic.
| Function | Model | OEM | Public datasheet / product page |
|---|---|---|---|
| On-grid string inverter (BoS anchor) | Sungrow SG50CX-P2-CN | Sungrow Power Supply Co., Ltd. | SG50CX-P2-CN Datasheet (PDF); product index Sungrow string inverter range |
| PV modules (~620 Wp mono) | Jinko Solar JKM620N-78HL4-BDV (Tiger Neo) | Jinko Solar Co., Ltd. | JKM620N-78HL4-BDV Datasheet (PDF) |
| Mounting structure (metal-roof, non-penetrative) | K2 Systems S-Dome 6.10 (clamped rail, trapezoidal sheet) | K2 Systems GmbH | K2 Systems (mounting) |
| Yield source (irradiation, south-central VN) | NASA POWER — Prediction of Worldwide Energy Resource (POWER) project, hourly/meteorology surface | NASA Langley Research Center | NASA POWER project; PVGIS cross-check PVGIS (JRC) |
| EVN reference (grid, tariff framework) | Vietnam Electricity (EVN) — group portal | EVN | EVN corporate portal |
Inverter limits (torque / SOC / voltages) must be read against the Sungrow SG50CX-P2-CN datasheet revision linked above; module limits against the JKM620N-78HL4-BDV revision linked above. No third-party logos or "No.1" claims are reproduced on this page.
| Parameter | Value | Unit | Source / evidence |
|---|---|---|---|
| DC system size (modules) | ~62.5 | kWp | Model assumption — DC/AC ratio 1.25 against 50 kW AC (Sungrow SG50CX-P2-CN rated AC output) |
| Inverter AC output | 50 | kW | Sungrow SG50CX-P2-CN datasheet — rated AC output 50 kW |
| Grid interface | 3-phase, 400 V, 50 Hz | — | Sungrow SG50CX-P2-CN datasheet — grid interface |
| Annual specific yield (PLAN) | ~1,350 | kWh/kWp/yr | Model assumption — south-central VN long-term average; cross-check vs. NASA POWER and PVGIS (JRC) |
| Annual generation | 84,375 (Year-1) | kWh/yr | Computed = 62.5 × 1,350 (Year-1); degrades 0.5 %/yr |
| Self-consumption share | 70 | % | Model assumption — daytime warehouse load |
Numbers labelled ILLUSTRATIVE — NOT A QUOTE.
CapEx is built around the inverter (BoS anchor) plus modules, mounting, DC/AC cabling, protection, freight/logistics from China to Vietnam, and import duty + VAT (duty/VAT cell is PENDING until the GDVC lookup is recorded against the accessed date).
| Line item | Qty | Unit | Unit price (USD) | Subtotal (USD) | Source / evidence |
|---|---|---|---|---|---|
| Sungrow SG50CX-P2-CN inverter (BoS anchor) | 1 | pcs | RFQ | RFQ | SG50CX-P2-CN datasheet (PDF) |
| Jinko JKM620N-78HL4-BDV modules (~620 Wp) | ~101 | pcs | RFQ | RFQ | JKM620N-78HL4-BDV datasheet (PDF) |
| K2 Systems S-Dome 6.10 mounting (metal-roof, non-penetrative) | 1 | lot | RFQ | RFQ | K2 Systems mounting |
| DC cabling, MC4 connectors, AC cabling | 1 | lot | RFQ | RFQ | IEC 62930 Ed.1 |
| DC/AC protection (SPD Type II, MCB, RCD, isolators) | 1 | lot | RFQ | RFQ | IEC 61643-11 Ed.1 |
| Smart / export meter | 1 | pcs | RFQ | RFQ | Utility-approved meter per local EVN/PC |
| EPC install + commissioning (labour) | 1 | lot | RFQ | RFQ | EPC scope |
| Ocean freight CN → VN (FOB or CIF) | 1 | lot | RFQ | RFQ | Incoterms 2020 (ICC) |
| Marine insurance (~0.3 % CIF) | 1 | lot | RFQ | RFQ | Insurer quote |
| Import duties + VAT (Vietnam) | 1 | lot | PENDING — GDVC lookup | PENDING — GDVC lookup | Vietnam Customs (GDVC), tariff search customs.gov.vn — Tariff enquiry, accessed 2026-09-21 |
| Customs broker + port handling (THC) | 1 | lot | RFQ | RFQ | Broker quote |
All unit prices RFQ. The duty / VAT row must be replaced with the figure returned by the official Vietnam Customs (GDVC) tariff lookup; see §7.
OpEx is dominated by routine O&M, insurance, a small spare-parts reserve, and an inverter replacement reserve. Modules and mounting are assumed maintenance-light. Numbers below are bounded model assumptions for the TCO run; final OpEx must be re-quoted against the EPC scope.
| Line item | Year-1 (USD/yr) | Source / evidence |
|---|---|---|
| Routine O&M (cleaning, inspection, monitoring) | 1,200 (escalates 2 %/yr) | Model assumption (bounded) — EPC scope |
| Insurance (~0.2 % of CapEx/yr) | included in OpEx schedule | Model assumption (bounded) — insurer quote |
| Spare parts / unplanned service reserve | included in OpEx schedule | Model assumption (bounded) — EPC scope |
| Inverter replacement reserve | not provisioned in cashflow | Model assumption (bounded) — see TCO summary inputs note |
Annual figures are bounded model assumptions for the TCO run; re-validate against EPC scope before procurement.
| Metric | Value |
|---|---|
| Currency | USD |
| Horizon (years) | 25 |
| Discount rate | 8.00 % |
| Total undiscounted cost (USD) | 83,436.36 |
| Total discounted cost / PV of costs (USD) | 60,208.84 |
| Total undiscounted benefit (USD) | 183,796.59 |
| Total discounted benefit (USD) | 74,158.08 |
| NPV (USD) | 13,949.24 |
| IRR | 0.1122 |
| Simple payback (year) | 8.67 |
| Discounted payback (year) | 14.73 |
| LCOE (USD/kWh) | 0.0696 |
| Year | Cost (USD) | Benefit (USD) | Net (USD) | Discount factor | Discounted net (USD) | Energy (kWh) |
|---|---|---|---|---|---|---|
| 0 | 45,000.00 | 0.0000 | -45,000.00 | 1.00 | -45,000.00 | 0.0000 |
| 1 | 1,200.00 | 6,121.41 | 4,921.41 | 0.9259 | 4,556.86 | 84,375.00 |
| 2 | 1,224.00 | 6,212.62 | 4,988.62 | 0.8573 | 4,276.93 | 83,953.12 |
| 3 | 1,248.48 | 6,305.18 | 5,056.70 | 0.7938 | 4,014.17 | 83,533.36 |
| 4 | 1,273.45 | 6,399.13 | 5,125.68 | 0.7350 | 3,767.53 | 83,115.69 |
| 5 | 1,298.92 | 6,494.48 | 5,195.56 | 0.6806 | 3,536.01 | 82,700.11 |
| 6 | 1,324.90 | 6,591.25 | 5,266.35 | 0.6302 | 3,318.69 | 82,286.61 |
| 7 | 1,351.39 | 6,689.45 | 5,338.06 | 0.5835 | 3,114.71 | 81,875.18 |
| 8 | 1,378.42 | 6,789.13 | 5,410.70 | 0.5403 | 2,923.24 | 81,465.80 |
| 9 | 1,405.99 | 6,890.29 | 5,484.29 | 0.5002 | 2,743.51 | 81,058.48 |
| 10 | 1,434.11 | 6,992.95 | 5,558.84 | 0.4632 | 2,574.82 | 80,653.18 |
| 11 | 1,462.79 | 7,097.15 | 5,634.35 | 0.4289 | 2,416.48 | 80,249.92 |
| 12 | 1,492.05 | 7,202.89 | 5,710.84 | 0.3971 | 2,267.85 | 79,848.67 |
| 13 | 1,521.89 | 7,310.22 | 5,788.33 | 0.3677 | 2,128.36 | 79,449.42 |
| 14 | 1,552.33 | 7,419.14 | 5,866.81 | 0.3405 | 1,997.42 | 79,052.18 |
| 15 | 1,583.37 | 7,529.68 | 5,946.31 | 0.3152 | 1,874.52 | 78,656.92 |
| 16 | 1,615.04 | 7,641.88 | 6,026.83 | 0.2919 | 1,759.18 | 78,263.63 |
| 17 | 1,647.34 | 7,755.74 | 6,108.40 | 0.2703 | 1,650.91 | 77,872.31 |
| 18 | 1,680.29 | 7,871.30 | 6,191.01 | 0.2502 | 1,549.29 | 77,482.95 |
| 19 | 1,713.90 | 7,988.58 | 6,274.69 | 0.2317 | 1,453.92 | 77,095.54 |
| 20 | 1,748.17 | 8,107.61 | 6,359.44 | 0.2145 | 1,364.41 | 76,710.06 |
| 21 | 1,783.14 | 8,228.42 | 6,445.28 | 0.1987 | 1,280.39 | 76,326.51 |
| 22 | 1,818.80 | 8,351.02 | 6,532.22 | 0.1839 | 1,201.54 | 75,944.88 |
| 23 | 1,855.18 | 8,475.45 | 6,620.27 | 0.1703 | 1,127.53 | 75,565.15 |
| 24 | 1,892.28 | 8,601.73 | 6,709.45 | 0.1577 | 1,058.08 | 75,187.33 |
| 25 | 1,930.12 | 8,729.90 | 6,799.78 | 0.1460 | 992.89 | 74,811.39 |
Figures below are labelled ILLUSTRATIVE — NOT A QUOTE. They use the placeholder CapEx and OpEx schedule that produces the TCO summary above (NPV USD 13,949.24, simple payback 8.67 yr, discounted payback 14.73 yr). Self-consumption tariff, export tariff, OpEx escalation, module degradation and residual value are bounded model assumptions.
| All-in CapEx (incl. freight + duty placeholder) | USD 45,000 | Model assumption (bounded) — Year-0 spend |
| Year-1 OpEx | USD 1,200 | Model assumption (bounded) — escalates 2 %/yr |
| Year-1 generation | 84,375 kWh | 62.5 kWp × 1,350 kWh/kWp; degrades 0.5 %/yr |
| Self-consumption share | 70 % | Model assumption (bounded) |
| Self-consumed electricity tariff (Year 1, blended) | USD 0.0725 /kWh (model blended tariff equivalent) | Bounded model assumption; cross-check vs. EVN corporate portal |
| Export tariff (surplus, Year 1) | USD 0.0435 /kWh | Bounded model assumption; cross-check vs. EVN corporate portal |
| Tariff escalation | 2.0 %/yr | Model assumption (bounded) |
| Module degradation | 0.5 %/yr | Model assumption (bounded) |
| Residual value | USD 0 (year N/A) | Model assumption (bounded) — year/end not specified |
| Inverter replacement reserve | DROPPED — not provisioned in cashflow | Model assumption (bounded) — explicit drop note |
Bounded model inputs are explicit model assumptions, not sourced facts; they must be re-validated for the specific hangar-rooftop site and the specific OEM model selected via the RFQ.
Recomputed against the bounded inputs (Year-1 generation 84,375 kWh, self-consumption share 70 %, blended tariff 0.0725 USD/kWh, export tariff 0.0435 USD/kWh, Year-1 OpEx 1,200 USD). Tariff column = blended self-consumption tariff in USD/kWh.
| All-in CapEx \ Self-consumption tariff | USD 0.0600/kWh | USD 0.0725/kWh | USD 0.0850/kWh |
|---|---|---|---|
| USD 38,000 | 8.81 | 7.43 | 6.40 |
| USD 45,000 | 10.30 | 8.67 | 7.46 |
| USD 52,000 | 11.78 | 9.91 | 8.52 |
Sensitivity holds generation (84,375 kWh/yr), self-consumption share (70 %), export tariff (0.0435 USD/kWh) and OpEx (1,200 USD/yr, 2 %/yr escalation) constant; only CapEx and self-consumption tariff move. ILLUSTRATIVE — NOT A QUOTE.
| Standard / mark | Scope | Acceptable issuers (allow-list) | Public reference |
|---|---|---|---|
| IEC 62109-1 / -2 | Power converter safety | TÜV Rheinland, TÜV SÜD, VDE, UL LLC, CSA Group | IEC 62109-1:2010 (TC 82); IEC 62109-2:2011 (TC 82) |
| IEC 61727 / IEC 62116 | Grid compliance (anti-islanding, harmonic, FRT) | TÜV Rheinland, TÜV SÜD, DNV | IEC 61727 Ed.2; IEC 62116 Ed.2 |
| CE marking | EU Declaration of Conformity issued by OEM | OEM-issued DoC, notified body report referenced | EU Regulation (EU) 2019/1020, EUR-Lex CE / market surveillance |
| IP rating (≥ IP65 outdoor) | Ingress protection | IEC 60529 test report from accredited lab | IEC 60529 Ed.2.2 |
| Vietnam grid acceptance | Local utility type-test / connection agreement | Regional power company (EVN / PC) | EVN corporate portal |
| UN transport (battery / dangerous goods if any storage) | UN Manual of Tests and Criteria for lithium cells (UN 38.3) | UN publication | UN Manual of Tests and Criteria (UNECE) |
No logo, certificate number or "No.1" claim is reproduced on this page. All certificate numbers and issuer names must be verified from the OEM certificate PDF before procurement.
HS national line | Program | As-of: 2026-09-21 | SoT: PENDINGPENDING — lookup. Official portal: Vietnam Customs — General Department of Vietnam Customs (GDVC), tariff enquiry: https://www.customs.gov.vn/index.jsp?pageId=8. Exact HS national line: PENDING — lookup (likely candidate: 8504.40.90 — static converters, heading 8504, chapter 85; final line to be confirmed via the GDVC tariff search).
| Component | Rate | Notes / SoT |
|---|---|---|
| Import duty (MFN) — inverter | PENDING — lookup | SoT: Vietnam Customs (GDVC) tariff enquiry, https://www.customs.gov.vn/index.jsp?pageId=8, accessed 2026-09-21; candidate heading 8504 |
| Import duty (preferential) — ASEAN / EVFTA / RCEP | PENDING — lookup | SoT: GDVC preferential tariff schedule, accessed 2026-09-21; C/O eligibility PENDING — lookup. EVFTA text reference: EU-Vietnam FTA (EUR-Lex) |
| VAT | PENDING — lookup | SoT: GDVC tariff page + General Department of Taxation, accessed 2026-09-21 |
| Special consumption tax (SCT) | PENDING — lookup | SoT: GDVC, accessed 2026-09-21; inverters typically not in SCT scope but verify per HS line |
| Other (environmental, recycling fee) | PENDING — lookup | SoT: GDVC, accessed 2026-09-21 |
No rate is hardcoded. Final landed duty + VAT cell in the CapEx table must be replaced with the figure returned by the official GDVC lookup, with the accessed date recorded.
Submit the form below. Tradvolt replies within 48 hours with OEM availability for the Sungrow SG50CX-P2-CN, a firm FOB / CIF price, lead time, and the certificate pack (IEC 62109 / IEC 61727 / IEC 62116, CE DoC, IP test report).
Candidate national line 8504.40.90 (static converters) under heading 8504, chapter 85, per Vietnam Customs (GDVC) tariff nomenclature. The exact national line, MFN rate and any EVFTA / RCEP preferential rate must be confirmed at the live GDVC tariff enquiry page (https://www.customs.gov.vn/index.jsp?pageId=8) before procurement.
Yes. Rooftop grid-tied systems require a grid connection agreement with the regional power company (EVN / regional PC). Final scope of approval is confirmed with the buyer's local utility; the public framework is set out by EVN (https://www.evn.com.vn/).
Commonly accepted evidence: IEC 62109-1/-2 (safety, IEC 62109-1 / IEC 62109-2), IEC 61727 / IEC 62116 (grid compliance, anti-islanding), issued by accredited CBs such as TÜV Rheinland or TÜV SÜD, and a CE Declaration of Conformity issued by the OEM. Vietnam-specific utility type-test acceptance is confirmed with the local EVN/PC.
No. The payback, sensitivity, NPV, IRR and LCOE figures are ILLUSTRATIVE — NOT A QUOTE. They depend on the inverter OEM model (Sungrow SG50CX-P2-CN), FOB/CIF price, freight, duty/VAT, irradiation, EVN tariff and financing assumptions that must be re-validated for the specific hangar-rooftop site via the RFQ.
Common choices: FOB Shanghai / Ningbo / Shenzhen (buyer arranges ocean freight and insurance) or CIF Hai Phong / Da Nang / Cat Lai (seller arranges freight to named Vietnamese port), per ICC Incoterms 2020. CIF is convenient for a first import; FOB gives the buyer cost control. The selected Incoterm must be entered in the RFQ form.
The OEM datasheet for the Sungrow SG50CX-P2-CN is provided in English (SG50CX-P2-CN datasheet, PDF). A Vietnamese translation, if required, is typically prepared by the importer for local utility submission and is not included by default.