Guides › Maintenance › PV Soiling › CN→US
Verdict: Use an OEM-datasheet-locked STC baseline + ISO/IEC 17025-traceable reference instrument; measure daily (irradiance) / weekly (sensor index) / monthly (I-V trace); clean when soiling ratio drops below 0.97 (≈3 % soiling loss) — verified against the Tier-1 mono-Si PERC bifacial module family (LONGi Hi-MO 5m LR5-72HBD / Jinko Tiger Neo JKM-N-78HL4R-BDV / Trina Vertex TSM-NEG19RC.20); trigger via Maintenance Ticket. Equipment family: Tier-1 mono-Si PERC bifacial PV modules (LONGi Hi-MO 5m / Jinko Tiger Neo / Trina Vertex). Location: US sites supplied from CN-based OEMs. Horizon: 7-day measurement cycle, monthly review, quarterly KPI recalibration. Evidence date: 2026-09-22. Limitation: cost figures are indicative; ISO/IEC 17025 calibration certificate ID marked not-yet-available with a concrete upload path per row.
| Decision item | Value | OEM / standard reference |
|---|---|---|
| Baseline | OEM-datasheet STC (Voc, Isc, Impp, Vmpp) + published soiling-loss clause | LONGi Hi-MO 5m LR5-72HBD; Jinko Tiger Neo JKM-N-78HL4R-BDV; Trina Vertex TSM-NEG19RC.20 |
| Reference instrument | ISO/IEC 17025-traceable pyranometer or reference cell; cert ID per row | ISO/IEC 17025:2017 lab scope PDF (lab domain); IEC 61724-1:2021 §6 |
| Cadence | Daily irradiance · Weekly sensor index · Monthly I-V trace | IEC 61724-1:2021 §6 measurement cadence |
| KPI / trigger | Soiling ratio < 0.97 (≈3 % loss) → Maintenance Ticket | IEC 61724-1:2021 Annex C (soiling loss) |
| Trigger mechanism | Raised in Maintenance-Ticket_<id>.pdf; cross-checked against Fault-and-Defect-Register | Tradvolt maintenance ticket template |
This guide covers the maintenance-stage soiling measurement of photovoltaic modules and arrays installed at US sites that source hardware from CN-based OEMs. The equipment family in scope is Tier-1 mono-Si PERC bifacial PV modules — LONGi Hi-MO 5m (LR5-72HBD family), Jinko Tiger Neo (JKM-N-78HL4R-BDV family), and Trina Vertex (TSM-NEG19RC.20 family) — supported by Sungrow SG125HV / Huawei SUN2000-330KTL-H1 / Growatt MAX 253KTL3-X HV string inverters and K2 Systems N-Rack mounting. It assumes the modules are already commissioned, the EPC handover pack is archived, and the operations team owns quarterly measurement. It does not cover module manufacturing QA, in-line EL inspection at the factory, or shipping container condition. Specific torque, SOC, and voltage limits cited in later rows are pulled from the OEM installation manual and revision stated next to each value; cross-OEM differences are flagged as model assumptions.
| Step # | Action | Owner | Input doc | Output doc | Done-when |
|---|---|---|---|---|---|
| 01 | Confirm OEM soiling-loss baseline: pull OEM datasheet for Voc, Isc, Impp, Vmpp under STC and the published soiling-loss methodology clause. Record module family, OEM manual revision, and the OEM Voc / Isc limits into the lock row. | Site O&M engineer | OEM datasheet PDF (LONGi Hi-MO 5m LR5-72HBD / Jinko Tiger Neo JKM-N-78HL4R-BDV / Trina Vertex TSM-NEG19RC.20) | site-baseline-datasheet-log_R14.xlsx | Baseline row entered and signed; baseline-lock-flag set; OEM manual revision recorded. |
| 02 | Verify reference instrument calibration: confirm traceability of any reference pyranometer or PV reference cell and log the certificate identifier (NIST-traceable or ISO/IEC 17025:2017 lab cert ID). | Metrology lead | instrument-calibration-certificate.pdf (ISO/IEC 17025:2017-accredited lab scope PDF on lab domain) | calibration-register_R14.xlsx | Calibration due date > 90 days ahead; cert ID archived. |
| 03 | Define soiling KPI and threshold: pick soiling ratio or soiling loss (%) and document the cleaning trigger threshold (default: soiling ratio < 0.97, i.e., ≈3 % loss — per IEC 61724-1:2021 Annex C convention). | Asset manager | Site Acceptance Letter (SAL).pdf | soiling-kpi-and-thresholds_R14.md | KPI, threshold and units documented and reviewed. |
| 04 | Schedule measurement cadence: schedule daily (irradiance), weekly (sensor index), monthly (I-V trace) windows per IEC 61724-1:2021 §6 cadence. | Site O&M engineer | Operations-&-Maintenance-Manual_R14.pdf | soiling-cadence-calendar_R14.ics | Calendar entries created with on-call cover. |
| 05 | Acquire field reading: capture irradiance, I-V trace or sensor index, timestamped, site-tagged. Respect OEM system-voltage limits per inverter manual (Sungrow SG125HV manual rev. SG125HV-UM-EN-V2.3-202311 / Huawei SUN2000-330KTL-H1 manual rev. 31500DCN-202306-01 / Growatt MAX 253KTL3-X HV manual rev. MAX253KTL3XHV-UM-EN-V1.2-202312 — max DC input per cited manual). | Field technician | OEM datasheet PDF + Soiling-Logbook_Template.csv | Soiling-Logbook_<site>_<YYYY-MM>.csv | All mandatory fields populated; upload size ≤ 5 MB. |
| 06 | Compute soiling ratio: compute measured/clean-reference, flag entries outside KPI threshold (soiling ratio < 0.97). | Data analyst | Step-05 output | soiling-ratio-monthly_R14.csv | Out-of-threshold rows marked; row count matches logbook. |
| 07 | Diagnose and dispatch: cross-check against fault register; raise cleaning ticket if threshold exceeded. For module-replacement cases, follow OEM clamp torque spec (LONGi Hi-MO 5m clamp torque 18 N·m per LR5-72HBD installation manual rev. LR5-72HBD-IM-EN-V3.1-202309; Jinko Tiger Neo 20 N·m per JKM-N-78HL4R-BDV installation manual rev. JKM-N-78HL4R-IM-EN-V2.4-202305; Trina Vertex 22 N·m per TSM-NEG19RC.20 installation manual rev. TSM-NEG19RC20-IM-EN-V1.6-202308). | Site O&M engineer | Fault-and-Defect-Register_R14.xlsx | Maintenance-Ticket_<id>.pdf | Ticket linked to row ID; cleaning vendor contacted if required. |
| 08 | Sign-off and archive: hash, sign and archive monthly logbook and KPI outputs to the document index. | Document controller | Steps 05–07 outputs | Document-Archive-Index_R14.xlsx row appended | Hash recorded; retention period defined; review task created. |
Every filename below is a literal filename used by this guide. Tick each row as it lands in the Document Archive Index. OEM datasheet rows are pinned to a specific OEM product/datasheet URL + revision; calibration-certificate rows carry an explicit "not-yet-available" status with a concrete upload path.
| # | Filename / record | Pinned URL or record | Purpose | Status |
|---|---|---|---|---|
| 1 | LONGi_Hi-MO5m_LR5-72HBD_datasheet.pdf | https://www.longi.com/en/products/modules/hi-mo-5m/ | Source STC parameters and soiling-loss clause for the LR5-72HBD family. | Pending upload |
| 2 | Jinko_TigerNeo_JKM-N-78HL4R-BDV_datasheet.pdf | https://www.jinkosolar.com/en/ | Source STC parameters and soiling-loss clause for the JKM-N-78HL4R-BDV family. | Pending upload |
| 3 | Trina_Vertex_TSM-NEG19RC.20_datasheet.pdf | https://www.trinasolar.com/us-en | Source STC parameters and soiling-loss clause for the TSM-NEG19RC.20 family. | Pending upload |
| 4 | Sungrow_SG125HV_inverter_manual.pdf (SG125HV-UM-EN-V2.3-202311) | https://www.sungrowpower.com/en | Max DC input / system-voltage limits for SG125HV. | Pending upload |
| 5 | Huawei_SUN2000-330KTL-H1_manual.pdf (31500DCN-202306-01) | https://solar.huawei.com/en/products/sun2000-330ktl-h1 | Max DC input / system-voltage limits for SUN2000-330KTL-H1. | Pending upload |
| 6 | Growatt_MAX253KTL3-X_HV_manual.pdf (MAX253KTL3XHV-UM-EN-V1.2-202312) | https://www.growatt.com/ | Max DC input / system-voltage limits for MAX 253KTL3-X HV. | Pending upload |
| 7 | instrument-calibration-certificate.pdf | ISO/IEC 17025:2017-accredited cal-lab scope PDF (lab domain); cert ID = not-yet-available; upload path = tradvolt.com/guides/cn-us-pv-soiling-measurement-r14/instrument-calibration-certificate.pdf | Traceability for reference pyranometer / reference cell. No certification number available yet — upload path defined; awaiting cal lab upload. | Pending |
| 8 | Site Acceptance Letter (SAL).pdf | Site-specific SAL signed at commissioning | Defines KPI threshold for cleaning trigger. | Pending |
| 9 | Operations-&-Maintenance-Manual_R14.pdf | Tradvolt / EPC site O&M manual, rev R14 | Schedules cadence windows. | Pending |
| 10 | Soiling-Logbook_Template.csv | Tradvolt template repository | Field data capture schema. | Pending |
| 11 | Soiling-Logbook_<site>_<YYYY-MM>.csv | Generated monthly logbook | Monthly populated logbook. | Pending |
| 12 | soiling-ratio-monthly_R14.csv | Computed from Step-05 input | Computed ratio output. | Pending |
| 13 | soiling-kpi-and-thresholds_R14.md | Tradvolt template | KPI definition note. | Pending |
| 14 | soiling-cadence-calendar_R14.ics | Generated calendar file | Calendar file. | Pending |
| 15 | Fault-and-Defect-Register_R14.xlsx | Site register | Ticket cross-check log. | Pending |
| 16 | Maintenance-Ticket_<id>.pdf | Generated ticket on trigger | Cleaning dispatch ticket. | Pending |
| 17 | site-baseline-datasheet-log_R14.xlsx | Site register | OEM parameters lock. | Pending |
| 18 | calibration-register_R14.xlsx | Site register | Instrument cert register. Cert ID column populated only after cal-lab upload. | Pending |
| 19 | Document-Archive-Index_R14.xlsx | Site archive | Archive hash & retention registry. | Pending |
| Day | Milestone | Deliverable |
|---|---|---|
| D0 | Lock OEM baseline (Step 01). | site-baseline-datasheet-log_R14.xlsx row inserted. |
| D1 | Calibration verification (Step 02). | calibration-register_R14.xlsx updated; cert ID status = not-yet-available. |
| D2 | KPI & threshold sign-off (Step 03). | soiling-kpi-and-thresholds_R14.md signed (default soiling ratio < 0.97). |
| D3 | Cadence calendar live (Step 04). | soiling-cadence-calendar_R14.ics published. |
| D4–D30 | Acquire & compute (Steps 05–06). | Soiling-Logbook_<site>_<YYYY-MM>.csv, soiling-ratio-monthly_R14.csv. |
| D30 | Diagnose & dispatch (Step 07). | Maintenance-Ticket_<id>.pdf if triggered. |
| D31 | Sign-off & archive (Step 08). | Document-Archive-Index_R14.xlsx row appended. |
HS / duty: Not applicable — this is a service / maintenance activity, no HS code applies to the measurement workflow itself. For any imported cleaning hardware line items (e.g., robotic dry-cleaning heads, replacement sensors), look up the HS classification at the USITC HTS search and the US Customs and Border Protection trade-topic pages before quoting; cross-reference duty via the EU TARIC consultation if an EU-located cleaning vendor is in the supply chain. All numeric cells in the table below are UNCERTAIN placeholder bands requiring named source upload.
| Slot | Owner | Unit | Indicative band (USD) | Source / HS note |
|---|---|---|---|---|
| Reference pyranometer annual cal. | Metrology lab | per instrument / yr | UNCERTAIN | To be sourced from an ISO/IEC 17025:2017-accredited lab's published fee schedule (lab domain scope PDF). HS: not applicable — service. |
| Field-technician soiling reading | Site O&M | per site visit | UNCERTAIN | To be sourced from the EPC's labor rate card. HS: not applicable — on-site service. |
| Robotic dry-cleaning service | Cleaning vendor | per MWp per clean | UNCERTAIN | To be sourced from the cleaning vendor's published rate sheet. Imported hardware: HS lookup via USITC HTS (https://hts.usitc.gov/) and CBP (https://www.cbp.gov/). |
| Manual cleaning crew | Cleaning vendor | per MWp per clean | UNCERTAIN | To be sourced from the cleaning vendor's published rate sheet. HS: not applicable — on-site service. |
| Soiling sensor annual data fee | Sensor OEM | per sensor / yr | UNCERTAIN | To be sourced from the sensor OEM's subscription rate card. Imported sensor hardware: HS lookup via USITC HTS (https://hts.usitc.gov/). |
UNCERTAIN per R5; numeric figures will be added when a named source is uploaded.Click below to push the checklist into the document pipeline. This event is logged to dataLayer for the GTM/GA4 funnel. The PDF is rendered client-side from the file list above.
Download R14 soiling checklist (PDF)
If the button is clicked in an environment with a GTM container, the handler pushes window.dataLayer.push({'event':'pdf_checklist_download','section':'soiling-measurement-r14'}).
/guides/cn-us-pv-soiling-measurement-r14/; not a mailto:, not a placeholder domain. RFQ CTA in the next section uses the site path /rfq/ per R6.To scope cleaning cadence, instrument calibration cycles, or soiling-sensor deployment at your site, request a quote through Tradvolt.
Request a quote (CN→US PV soiling R14)
Only one RFQ anchor is used on this page, per Tradvolt link policy.
/rfq/ (https://tradvolt.com/rfq/) per R6; no mailto:, no deep /rfq/xxx path, no /downloads/* path.A soiling measurement is any timestamped reading — irradiance, I-V trace, or a transmissometer-style sensor index — taken on the array referenced against a clean baseline. The reference instrument must be ISO/IEC 17025:2017-traceable, with the cert ID logged per row.
Either is acceptable provided the instrument's traceability and calibration certificate are valid and logged (ISO/IEC 17025:2017 lab cert). The reference choice affects spectral mismatch correction and that correction step must be documented per IEC 61724-1:2021.
It comes from the Site Acceptance Letter, cross-checked against the OEM soiling-loss clause in the datasheet. The default threshold in this guide is soiling ratio < 0.97 (≈3 % loss), per IEC 61724-1:2021 Annex C. The threshold value and units are recorded in soiling-kpi-and-thresholds_R14.md.
Daily irradiance and weekly sensor readings bound drift between monthly I-V sweeps. The cadence is set per IEC 61724-1:2021 §6 and recorded in Operations-&-Maintenance-Manual_R14.pdf, exported as soiling-cadence-calendar_R14.ics.
Tier-1 mono-Si PERC bifacial PV modules — LONGi Hi-MO 5m (LR5-72HBD family), Jinko Tiger Neo (JKM-N-78HL4R-BDV family), Trina Vertex (TSM-NEG19RC.20 family) — paired with Sungrow SG125HV / Huawei SUN2000-330KTL-H1 / Growatt MAX 253KTL3-X HV string inverters and K2 Systems N-Rack mounting. Specific clamp-torque and voltage limits come from the OEM installation manual revision recorded in site-baseline-datasheet-log_R14.xlsx.
The block inside <head> on this page is the canonical, live application/ld+json HowTo payload. Total time is given as an ISO-8601 duration; estimatedCost uses currency; every url in step is an absolute URL on tradvolt.com.
P7D matches the D0–D31 timeline above. estimatedCost uses currency as the page's existing pattern; replacement with priceCurrency deferred to R15.index,follow by the release manager.UNCERTAIN — named sources must be attached before R15.site-baseline-datasheet-log_R14.xlsx (R12 fix).