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Six-year PV field study links 2020 output drop to skipped maintenance, not module degradation

Algerian 12 MW plant saw performance ratio slide from 85.37% to 78.74% in 2020 during COVID-19 maintenance gaps, recovering to 84.83% by 2023.

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TL;DR — üç cümle

  • Researchers at Djillali Liabes University reported a six-year performance assessment of a 12 MW PV plant in Sidi Bel-Abbes, Algeria, covering 2018–2023. (S1)
  • The plant uses 47,808 Hanwha Qcells HSL60-PB-1-250 (250 W) polycrystalline modules and 12 SMA Sunny Central 800CP XT inverters across six 2 MW subfields. (S1)
  • Performance ratio fell from 85.37% in 2019 to 78.74% in 2020, attributed to reduced cleaning and maintenance during COVID-19 restrictions. (S1)

Alınan key_takeaways (gerçek alan, en fazla 3 girişe). Gerçek ve analiz ayrıca etiketlenmiştir

Six-year PV field study links 2020 output drop to skipped maintenance, not module degradation — Industry Insights news briefEditorial cover for a Industry Insights brief. Factory motif; headline "Six-year PV field study links 2020 output drop to skipped maintenance, not module degradation". Reported key numbers: 82.6 %. 1 cited source. Static cover (no animation).INDUSTRY INSIGHTS · NEWS BRIEFSix-year PV field study links 2020output drop to skipped maintenance, notmodule degradationREPORTED KEY NUMBERS82.6 %1 sourceXAIPART
Cover image generated from data already shown on this page: the category motif, the headline, and reported key numbers. No decorative illustration; no third-party image.

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Reported by PV Magazine on 2026-10-17. Summarized and analyzed by XAIPART Editorial.

What happened

Researchers at Djillali Liabes University of Sidi Bel-Abbes published a six-year performance assessment of a 12 MW grid-connected solar power plant in Sidi Bel-Abbes, western Algeria, covering through .S1 The study identified a marked performance decline in 2020, attributed to reduced maintenance under COVID-19 restrictions.

The plant uses 12 Sunny Central 800CP XT inverters from SMA and 47,808 polycrystalline silicon HSL60-PB-1-250 modules from Hanwha Qcells, each rated at 250 W, mounted at a 34° south-facing tilt.S1 The installation is organized into six 2 MW subfields, each with two inverters feeding a step-up transformer. On-site monitoring follows IEC 61724, recording data every 15 minutes from a control room equipped with supervisory and grid-monitoring computers plus an on-site weather station that measures irradiance, ambient temperature, humidity and wind speed.S1

Dust control relied on a semi-automatic cleaning system with tractor-towed rotating brushes; the researchers tracked reference yield, array yield, final yield, performance ratio (PR), capacity utilization factor, inverter efficiency, capture losses and system losses.S1 Ambient temperatures ranged from 8–10 °C in winter to 22–24 °C in summer, with monthly solar irradiation between 100 and 275 kWh/m² and peaks in June and July.

Annual generation ranged from 19.83 to 21.41 GWh, with 2019 the highest-output year; monthly production peaked at 2,258 MWh in August 2019 and bottomed at 1,125 MWh in January 2020.S1 Average daily reference, array and final yields were 5.65, 4.92 and 4.65 hours, with capture losses of 0.3–1.5 h/day and system losses of 0.1–0.5 h/day. The PR fell to 78.74% in 2020 from 85.37% in 2019, then recovered to 84.83% in 2023, with a six-year average of 82.6%.S1 Module efficiency ran 12–14%, inverter efficiency held at 97–98%, and the average annual capacity factor reached 19.3%, peaking at 20.30% in 2019. Estimated degradation rates were 4.12% and 4.38% across two irradiance/temperature conditions.S1 Findings appeared in Journal of Engineering Research.

Key numbers (Sidi Bel-Abbes 12 MWp plant)
MetricReported valueSource
Installed capacity12 MW grid-connected[S1]
Module count / model47,808 × Hanwha Qcells HSL60-PB-1-250 (250 W polycrystalline)[S1]
Inverter model12 × SMA Sunny Central 800CP XT[S1]
Six-year average PR82.6%[S1]
PR trajectory85.37% (2019) → 78.74% (2020) → 84.83% (2023)[S1]
Annual generation range19.83–21.41 GWh (2018–2023)[S1]
Peak monthly output2,258 MWh, August 2019[S1]
Lowest monthly output1,125 MWh, January 2020[S1]
Inverter efficiency~97–98%[S1]
Annual capacity factor19.3% avg, 20.30% max (2019)[S1]
Module degradation (estimated)4.12% and 4.38% (two conditions)[S1]

Background timeline

  1. – First year of operation included in the six-year study window. [S1]
  2. – Monthly output peaked at 2,258 MWh. [S1]
  3. – Monthly output bottomed at 1,125 MWh. [S1]
  4. – Performance ratio dropped to 78.74% versus 85.37% in 2019, linked by the researchers to reduced maintenance during COVID-19 restrictions. [S1]
  5. – Performance ratio recovered to 84.83%; six-year average PR reached 82.6%. [S1]
  6. – Findings published in the Journal of Engineering Research. [S1]

XAIPART take

Technical impact

The 6.63-percentage-point PR swing from 2019 to 2020 was not accompanied by any reported change in module degradation slope, which held near 4.12–4.38% across conditions; the data therefore supports a soiling-and-maintenance attribution rather than an intrinsic module-failure mode on the HSL60-PB-1-250. XAIPART analysis

With inverter efficiency flat at 97–98% across all six years on SMA Sunny Central 800CP XT units, system losses of 0.1–0.5 h/day and capture losses of 0.3–1.5 h/day both track dust accumulation frequency, which is what the COVID-era gap appears to have aggravated. XAIPART analysis

Market impact

For EPCs and asset managers underwriting utility-scale PV in arid North-African and Middle-Eastern climates, this is a quantitative case study reinforcing recurring-cleaning line items rather than one-off capex choices. XAIPART analysis

Spare-parts planning for SMA Sunny Central 800CP XT inverters and Hanwha Qcells polycrystalline modules at multi-year horizons is unlikely to be affected; the bottleneck identified here is operations labor and brush-tractor cycles, not component supply. XAIPART analysis

Action

Procurement and O&M teams should weigh whether inverter-monitoring dashboards already on SMA inverter fleets can be re-used to alarm on per-string yield deviation, reducing reliance on a six-year ground-truth dataset. XAIPART analysis

Design engineers specifying future sites should treat 19.3% capacity factor and 82.6% PR as reference benchmarks for similar polycrystalline, fixed-tilt, semi-arid installations rather than as guaranteed values. XAIPART analysis

XAIPART Forecast

XAIPART expects that, if routine cleaning schedules at Sidi Bel-Abbes-style polycrystalline utility plants resume on a regular cadence (no further COVID-style gaps), the HSL60-PB-1-250-based PR band reported by the source (78.74–85.37%) will narrow toward the 84–85% range within 12 months of resumed maintenance, holding inverter efficiency near 97–98% on the SMA Sunny Central 800CP XT; if published site PR for comparable Algerian or comparable-climate polycrystalline sites drifts below 80% in any monthly average without a meteorological cause within 9 months, this forecast is wrong. XAIPART analysis

Facts are as reported by the cited source. The design-in, sourcing and forward-looking statements above are XAIPART's analysis, not the source's claims. Uncertainty: degradation percentages and the COVID-attribution are from a single academic publication at one site; weather-driven losses elsewhere may differ.

Corrections: none at publication. This brief will be updated with a timestamp if the source corrects its report.

Dated developments, extracted from this page's timeline (curated milestones = hollow markers).
Timeline of dated developmentsDated entries: 2018-01-01 – First year of operation included…; 2019-08-01 2019 – Monthly output peaked at 2,…; 2020-01-01 2020 – Monthly output bottomed at …; 2020-01-01 – Performance ratio dropped to 78.…; 2023-01-01 – Performance ratio recovered to 8…; 2026-10-17 – Findings published in the Journa….2018-01-01– First year of operation included…2019-08-012019 – Monthly output peaked at 2,…2020-01-012020 – Monthly output bottomed at …2020-01-01– Performance ratio dropped to 78.…2023-01-01– Performance ratio recovered to 8…2026-10-17– Findings published in the Journa…

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XAIPART expects that, if routine cleaning schedules at Sidi Bel-Abbes-style polycrystalline utility plants resume on a regular cadence (no further COVID-style gaps), the HSL60-PB-1-250-based PR band reported by the so... published site PR for comparable Algerian or comparable-climate polycrystalline sites drifts below 80% in any monthly average without a meteorological cause within 9 months within 12 months Pending

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Cost pressure by dimension — composite stateDiverging bars for three dimensions around a zero midpoint. Input Cost has no reading; Supply Demand z -1.4711, notable; Fx Energy z 0.1754, neutral. Composite index -9.7, band neutral.0Input costno readingSupply/demandz −1.4711 · notable46 dFX & energyz +0.1754 · neutral5 dcomposite −9.7 · neutral−100 · −40 · −15 · 0 · +15 · +40 · +100
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Kaynaklar

  1. Six-year testing highlights impact of reduced maintenance on PV plant operation during COVID-19 pandemic — https://www.pv-magazine.com/2026/10/17/six-year-testing-highlights-impact-of-reduced-maintenance-on-pv-plants-during-covid-19-pandemic/ · rss · erişildi

Fakatlar S1/S2 olarak işaretlenmiş ve bağlantılı kaynağa takip edilmiştir. İşaretlenmiş cümleler analiz XAIPART'ın kendi gerekçeleri, raporlanan gerçeklerden ayrı tutulur. Kaynak bağlantıları takip edilir. nofollow — atıf kasıtsızdır.