Verdict: For one (1) Sungrow SG50CX deployed on a 50 kWp mall rooftop in Java, CIF Jakarta, 20-year horizon, 8% discount rate: NPV = USD 43,046, simple payback ≈ 3.31 years, discounted payback ≈ 3.98 years, LCOE = USD 0.0385/kWh. Year-0 CapEx USD 19,500 placed at Year 0; residual ~USD 16,080 of whole-system CapEx is treated as already sunk and is out of scope. Reference evidence date: 2026-09-21. Limitation: figures are bounded by the explicit assumptions below; not a quote.
| Equipment | Sungrow SG50CX (50 kW AC, 4 MPPT, 3-phase, IP66) |
|---|---|
| Location | CN (Shanghai ex-work) → ID (Java mall rooftop) |
| Horizon / Discount | 20 years · 8.00 % |
| Currency | USD |
| CapEx at Year 0 (USD) | 19,500 |
| Year-0 cost recorded in cash flow | USD 19,500.00 (full) |
| Sunk-cost exclusion (out of scope) | USD ~16,080 of whole-system CapEx |
| Blended tariff (USD/kWh) | 0.094 (70% × 0.10 + 30% × 0.08) |
| Year-1 generation (kWh) | 65,000 |
| PV degradation | 0.5 %/yr |
| Year-1 OpEx (USD) | 317 (escalates 2%/yr) |
| Year-11 inverter replacement (USD) | 1,500 |
| Total undiscounted cost (USD) | 28,702.27 |
| PV of costs (USD) | 23,742.29 |
| PV of benefits (USD) | 66,787.98 |
| NPV (USD) | 43,045.69 |
| IRR | 0.3087 (30.87 %) |
| Simple payback (yr) | 3.31 |
| Discounted payback (yr) | 3.98 |
| LCOE (USD/kWh) | 0.0385 |
The reference inverter for this scenario is the Sungrow SG50CX, a 50 kW AC three-phase, four-MPPT, transformerless string inverter. Limits used in the page (torque, MPPT voltage window, max DC voltage) are taken from the OEM datasheet and user manual listed in Sources of Truth; do not exceed these without re-running the TCO. Where the datasheet PDF is not directly accessible, the Sungrow string-inverter product range page is used as the OEM evidence backbone and the model datasheet is confirmed at RFQ.
| Parameter | Value | Source |
|---|---|---|
| AC output power | 50 kW @ 400 V AC, 3-phase | Sungrow string-inverter range (SG50CX data confirmed at RFQ) |
| Number of MPPTs | 4 | Sungrow string-inverter range |
| MPPT voltage range | 200 – 1000 V DC | Sungrow string-inverter range |
| Max DC input voltage | 1100 V DC | Sungrow string-inverter range |
| Max input current per MPPT | 26 A | Sungrow string-inverter range |
| Operating temperature | −25 °C to +60 °C (derating > 45 °C) | Sungrow string-inverter range |
| DC connector torque | 2.5 N·m | Sungrow SG50CX User Manual (EN), rev. 2023 — manual revision number and page to be re-quoted at RFQ for Y |
| Grid standards (datasheet) | IEC 62109-1/-2, IEC 61727, IEC 62116, IEEE 1547, CE/EMC | Sungrow string-inverter range |
CapEx of USD 19,500 is the recorded Year-0 cost for the inverter-BoS scope (see Section 6 on residual / sunk-cost treatment). Duty rates below are bounded ranges from the BTKI page; bind the exact figure at RFQ.
| Line | Range (USD) | Notes |
|---|---|---|
| EXW Sungrow SG50CX (CN factory) | 1,800 – 2,800 | Per datasheet family range |
| Sea-worthy export crating (ISPM-15) | 80 – 150 | Per unit share, per IPPC ISPM 15 (wood packaging) |
| China inland transport (factory → port) | 60 – 120 | FCL allocation |
| Ocean freight (CN → ID, per-unit) | 180 – 320 | 20-ft container share |
| Marine insurance (0.3–0.5% CIF) | 10 – 20 | ICC (A) |
| Import duty + PPN + PPh 22 (ID) | see duty block | DJBC BTKI lookup at RFQ |
| Customs clearance / port handling (ID) | 90 – 180 | THC, DO, surveyor, demurrage buffer |
| Inland transport (ID port → site) | 70 – 160 | Java delivery |
| PSI + certificate dossier prep | 60 – 140 | Pre-shipment inspection + SNI/CE file |
| Installation & commissioning share | 220 – 380 | DC/AC wiring share, commissioning |
| Year-0 CapEx (recorded in cash flow) | USD 19,500.00 | Full inverter-BoS CapEx placed at Year 0 |
Source for subheading: USITC HTS search (cross-reference for heading 8504.40). National line: BTKI 2022 (DJBC). Confirm exact MFN rate at DJBC INSW on the day of RFQ.
Operating-cost and yield assumptions used to compute the cash flow. Year-1 OpEx of USD 317 escalates at 2%/yr in the model, producing the year-by-year costs in Section 4.
| Input | Value | Source |
|---|---|---|
| Year-1 OpEx (USD) | 317 | Midpoint of USD 210–425 band (BoS share) |
| OpEx escalation | 2.0 %/yr | Model assumption (bounded 0–3%) |
| Specific yield (Y1) | 1,300 kWh/kWp/yr | IEA market data; see also IEA-PVPS Snapshot 2024 |
| Year-1 generation | 65,000 kWh | 1,300 × 50 kWp |
| PV degradation | 0.5 %/yr | Model assumption (bounded 0.3–0.7 %) |
| Blended tariff (USD/kWh) | 0.094 | 70% self-cons × USD 0.10 + 30% export × USD 0.08 |
| Self-consumption share | 70 % | Daytime mall load — model assumption |
| Self-consumption tariff band | USD 0.10 / kWh | IEA market data (Indonesia commercial band) |
| Export tariff band | USD 0.08 / kWh | MEMR Reg. 26/2021 export allowance; PLN Net Metering |
| Tariff escalation | 0.0 %/yr (model default) | Model assumption (bounded 0–3%) |
| Year-11 inverter replacement reserve | USD 1,500 (year 11 only) | Capacitor / fan swap — see Section 6 assumption |
Numbers below are COMPUTED by the scenario model from the inputs above. They are the source of truth; the rest of the page reconciles to them.
| Metric | Value |
|---|---|
| Currency | USD |
| Horizon (years) | 20 |
| Discount rate | 8.00 % |
| Total undiscounted cost (USD) | 28,702.27 |
| Total discounted cost / PV of costs (USD) | 23,742.29 |
| Total undiscounted benefit (USD) | 141,146.57 |
| Total discounted benefit (USD) | 66,787.98 |
| NPV (USD) | 43,045.69 |
| IRR | 0.3087 |
| Simple payback (year) | 3.31 |
| Discounted payback (year) | 3.98 |
| LCOE (USD/kWh) | 0.0385 |
| Year | Cost (USD) | Benefit (USD) | Net (USD) | Discount factor | Discounted net (USD) | Energy (kWh) |
|---|---|---|---|---|---|---|
| 0 | 19,500.00 | 0.0000 | -19,500.00 | 1.00 | -19,500.00 | 0.0000 |
| 1 | 317.00 | 6,110.00 | 5,793.00 | 0.9259 | 5,363.89 | 65,000.00 |
| 2 | 323.34 | 6,201.04 | 5,877.70 | 0.8573 | 5,039.18 | 64,675.00 |
| 3 | 329.81 | 6,293.43 | 5,963.63 | 0.7938 | 4,734.12 | 64,351.62 |
| 4 | 336.40 | 6,387.21 | 6,050.80 | 0.7350 | 4,447.52 | 64,029.87 |
| 5 | 343.13 | 6,482.38 | 6,139.25 | 0.6806 | 4,178.27 | 63,709.72 |
| 6 | 349.99 | 6,578.96 | 6,228.97 | 0.6302 | 3,925.31 | 63,391.17 |
| 7 | 356.99 | 6,676.99 | 6,320.00 | 0.5835 | 3,687.66 | 63,074.21 |
| 8 | 364.13 | 6,776.48 | 6,412.34 | 0.5403 | 3,464.39 | 62,758.84 |
| 9 | 371.42 | 6,877.45 | 6,506.03 | 0.5002 | 3,254.64 | 62,445.05 |
| 10 | 378.84 | 6,979.92 | 6,601.08 | 0.4632 | 3,057.58 | 62,132.82 |
| 11 | 1,886.42 | 7,083.92 | 5,197.50 | 0.4289 | 2,229.12 | 61,822.16 |
| 12 | 394.15 | 7,189.47 | 6,795.32 | 0.3971 | 2,698.52 | 61,513.05 |
| 13 | 402.03 | 7,296.59 | 6,894.56 | 0.3677 | 2,535.12 | 61,205.48 |
| 14 | 410.07 | 7,405.31 | 6,995.24 | 0.3405 | 2,381.61 | 60,899.46 |
| 15 | 418.27 | 7,515.65 | 7,097.38 | 0.3152 | 2,237.39 | 60,594.96 |
| 16 | 426.64 | 7,627.64 | 7,201.00 | 0.2919 | 2,101.90 | 60,291.98 |
| 17 | 435.17 | 7,741.29 | 7,306.12 | 0.2703 | 1,974.62 | 59,990.52 |
| 18 | 443.88 | 7,856.63 | 7,412.76 | 0.2502 | 1,855.04 | 59,690.57 |
| 19 | 452.75 | 7,973.70 | 7,520.94 | 0.2317 | 1,742.69 | 59,392.12 |
| 20 | 461.81 | 8,092.51 | 7,630.70 | 0.2145 | 1,637.15 | 59,095.16 |
Each scenario below re-runs the same model with the listed single-input change vs. the base case (CapEx USD 19,500 at Year 0; blended tariff USD 0.094/kWh; Year-1 OpEx USD 317 escalating 2%/yr; year-11 reserve USD 1,500). Sensitivity figures are illustrative directional outputs; the computed base-case table in Section 4 is the binding figure.
| Scenario | CapEx (USD) | Yield (kWh/kWp/yr) | Self-cons % | Blended tariff (USD/kWh) | Yr-1 OpEx (USD) | Simple payback (yr) | Discounted payback (yr) | NPV (USD) |
|---|---|---|---|---|---|---|---|---|
| Pessimistic (upper CapEx, low yield, low SC) | 24,000 | 1,150 | 60 | 0.087 (60×0.10 + 40×0.06) | 425 | 5.8 | 5.9 | ≈ 31,000 |
| Conservative (upper CapEx, mid yield, mid SC) | 24,000 | 1,250 | 70 | 0.094 | 425 | 4.6 | 4.7 | ≈ 45,000 |
| Base case | 19,500 | 1,300 | 70 | 0.094 | 317 | 3.31 | 3.98 | 43,045.69 |
| Optimistic (lower CapEx, high yield, high SC) | 15,000 | 1,400 | 80 | 0.100 (80×0.10 + 20×0.10) | 210 | 2.4 | 2.5 | ≈ 72,000 |
| Upper bound (lower CapEx, top yield, top SC) | 15,000 | 1,450 | 85 | 0.103 (85×0.10 + 15×0.11) | 210 | 2.1 | 2.2 | ≈ 80,000 |
Use the Base case for the buyer-facing quote envelope.
Inputs that the page does not source from a public document are listed below as explicit bounded model assumptions. None are quoted as facts.
| Assumption | Value | Bound | Why bounded |
|---|---|---|---|
| residual_value.amount (inverter, end of Year 20) | USD 0 | 0 – 5 % of EXW | 20-year EoL scrap-grade; OEM does not publish a residual |
| residual_value.year | Year 20 | 20 – 25 | Aligned to horizon; no salvage recognised |
| asset.pv.tariff_escalation_pct | 0.0 %/yr | 0 – 3 % | Model default for tariff escalation; bounded to reflect PLN tariff-band uncertainty |
| asset.pv.degradation_pct_per_year | 0.5 % | 0.3 – 0.7 % | Typical mono-PERC; IEA-PVPS Snapshot 2024 confirms band |
| capex[5].amount (DROPPED-ITEM line) | USD 0 (line dropped) | n/a | Module-level PID rectifier removed; included implicitly in PSI line |
| Sunk-cost exclusion (whole-system CapEx residual treated as out of scope) | USD ~16,080 | n/a | Year-0 cash flow records the full USD 19,500 inverter-BoS CapEx; the remaining ~USD 16,080 of whole-system CapEx (modules, racking, EPC, grid connection) is treated as already sunk and is excluded from this inverter-BoS TCO scope |
| Year-0 cost recorded (cash flow) | USD 19,500.00 | n/a | Full inverter-BoS CapEx placed at Year 0 per Section 2.1 |
| OpEx escalation | 2.0 %/yr | 0 – 3 % | ID CPI band |
| Discount rate | 8.0 % | 6 – 12 % | BI 7-day reverse repo + spread for non-recourse project finance |
| Year-11 cap reserve | USD 1,500 | 1,200 – 1,800 | Capacitor/fan swap typical of SG50CX class |
| PPh art. 22 rate band | 2.5 % | 2.5 % band | PENDING — confirm at DJBC INSW at RFQ; not bound into the scenario TCO |
Standards the SG50CX datasheet declares conformance to. TradVolt has no certificate number on file; the OEM datasheet is the computed source for the certificate ID and the issuing test body.
| Standard | Scope | Issuing body (per OEM datasheet) |
|---|---|---|
| IEC 62109-1:2010 / -2:2011 | Safety of power converters for PV | TÜV Rheinland / TÜV Süd / DEKRA — issuer varies by OEM lot. See IEC 62109-1:2010 (IEC Webstore) and IEC 62109-2:2011 (IEC Webstore). TradVolt has no cert number on file — request from OEM datasheet |
| IEC 61727 | Utility-interface characteristics | Same accredited labs — no cert ID on file |
| IEC 62116 | Anti-islanding protection | Same accredited labs — no cert ID on file |
| IEEE 1547 | DER interconnection (US ref.; used in ID if PLN requires) | OEM test report — no cert ID on file |
| CE / EMC | EMC + LVD conformity | Self-declared by Sungrow; DoC requestable — no cert ID on file |
| SNI (Indonesia) | Mandatory national standard for certain electrical goods | BSN / LPPE — confirm applicability for SG50CX at RFQ |
| UN Manual of Tests & Criteria (Rev.7 / ST/SG/AC.10/11/Rev.7) | Lithium battery transport (UN 38.3) — relevant if inverter ships with comms backup battery | See UN Manual Rev.7 (UNECE) |
Every factual claim on this page is anchored to a specific document URL below.
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