What is the difference between YL580D-PERC and YL620D-TOPCon?

YL580D-PERC uses P-type half-cut PERC cells: 22.0% efficiency, 0.55%/yr degradation, -0.34%/°C temp coefficient, 12-yr product/25-yr performance warranty, lowest $/W. YL620D-TOPCon uses N-type TOPCon: 22.7% efficiency, 0.40%/yr degradation, -0.30%/°C temp coefficient, 15-yr product/25-yr performance warranty. TOPCon costs $0.20–0.25/W more but produces ~7,000 more kWh over 25 years for a 10 kW system.

What is Yingli's 25-year performance warranty guarantee?

Yingli's 25-year performance warranty guarantees no less than 80.7% of rated output at year 25. Actual output for TOPCon models (0.40%/yr) will be ~91.4% at year 25 — well above the guarantee floor. PERC models (0.55%/yr) reach ~87.2% — still above 80.7%. Product (workmanship) warranty is 12 years for PERC and 15 years for TOPCon models.

Is the YL660D-Bifacial worth it for my installation?

The YL660D-Bifacial 660W dual-glass makes sense for ground-mount systems (5–15% rear gain), carport canopies, and commercial flat roofs with high-albedo surfaces. For conventional asphalt shingle rooftops, bifacial rear gain drops to 2–5% — rarely worth the premium. The dual-glass also provides better moisture resistance for humid/coastal environments.

Yingli Solar Calculator

China Tier 1 value-tier brand — select YL580D-PERC 580W (22.0%), YL620D-TOPCon 620W (22.7%), or YL660D-Bifacial 660W. Get panel count, 25-year production, PERC vs TOPCon degradation comparison, and cost with ITC.

Yingli model & system inputs

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Peak sun hours (PSH)?

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YL580D-PERC 580W (22.0%) — Half-cut PERC — Budget residential workhorse — half-cut PERC cells, 25-yr performance warranty, lowest $/W in Yingli lineup

Yingli Solar specs results

Recommendation

Best for budget-first residential installs — lowest $/W in Yingli range, adequate roof space, standard 25-yr warranty

Value tier — comparable to budget China Tier 1 brands

Metric	YL580D-PERC 580W PERC
Panels needed	14 panels @ 580W each
Actual system size	8.12 kW
Panel efficiency	22%
System cost range	$15,834 – $18,270
Net cost after 30% ITC	$11,936
Year 1 production	10,670 kWh/yr
25-year total production	243,611 kWh
Efficiency at year 25	85.4%
Annual degradation	0.55%/yr
Annual savings	$1,707/yr
25-year savings	$38,978
Simple payback (after ITC)	7.0 years
Temperature coefficient	-0.34%/°C
Hot day output loss (35°C rise)	11.9% loss → 7.15 kW effective
Warranty	12-yr product / 25-yr performance
Manufacturer status	China Tier 1 — Bloomberg NEF Tier 1 certified

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How to Use This Calculator

Select your Yingli Solar model

Yingli Solar (also known as Yingli Green Energy) offers three product tiers. The YL580D-PERC uses half-cut PERC cells — the budget-friendly choice for residential buyers where roof space is not a constraint. The YL620D-TOPCon upgrades to N-type TOPCon for lower degradation and better temperature performance. The YL660D-Bifacial is the utility-grade TOPCon bifacial model with dual-glass construction for ground-mount and commercial applications.

Choose application and enter system details

Application selection changes the cost context. Residential installs include installer overhead and margin. Commercial achieves lower all-in $/W with bulk procurement. Yingli is a China Tier 1 manufacturer with Bloomberg NEF bankability status — their panels are accepted for commercial project financing. At $2.00–2.50/W installed, Yingli offers genuine value-tier pricing without sacrificing industry-standard warranty terms.

Interpret the degradation difference

The PERC model at 0.55%/yr vs TOPCon at 0.40%/yr may seem small, but over 25 years the PERC panel retains 87.2% of original output vs TOPCon's 91.4%. For a 10 kW system at 5 PSH producing 14,600 kWh/yr initially, the TOPCon model produces roughly 7,000 more kWh over 25 years — worth ~$1,120 at $0.16/kWh. This is the quantified value of upgrading from PERC to TOPCon.

The Formula

Panels Needed = ⌈System kW × 1000 ÷ Panel Watts⌉ Actual System kW = Panels × Panel Watts ÷ 1000 Year 1 Production = System kW × PSH × 365 × 0.80 × bifacial bonus First-Year Loss = 2.5% (PERC) or 2.0% (TOPCon) Year N Production = Year 1 × (1 − degradation/100)^N × (1 − first-year loss) 25-yr Total = Sum of Years 1–25 System Cost = System kW × 1000 × $/W (model range ±$0.15/W) Net Cost = System Cost × (1 − 0.30 ITC)

PERC panels have a slightly higher first-year degradation (2.5%) due to Light-Induced Degradation (LID) from boron-oxygen defects in P-type silicon. TOPCon N-type cells do not have this problem and use a 2.0% first-year estimate. The 0.80 system derating accounts for inverter losses, wiring, mismatch, soiling, and shading in a real-world installation.

Example

Kevin — 8 kW YL580D-PERC budget residential system, Georgia

Kevin is in Atlanta with 4.5 PSH and pays $0.14/kWh. He has plenty of south-facing roof space and wants the lowest $/W system from a bankable Tier 1 manufacturer.

Model selectedYL580D-PERC 580W (22.0% PERC)

System size8 kW

Peak sun hours4.5 hrs/day

Electricity rate$0.14/kWh

Results

Panels needed14 panels (8.12 kW actual)

System cost range$16,000 – $20,000

Net cost after ITC~$12,600

Year 1 production~10,700 kWh

25-year production~248,000 kWh

Annual savings~$1,498/yr

Simple payback~8.4 years

Kevin's low electricity rate means a longer payback, but Yingli's $2.00–2.20/W pricing keeps the net cost low enough that the system still makes financial sense. If Kevin upgrades to the TOPCon model, he adds ~$1,500 upfront but gains 7,000 kWh over 25 years (~$980 value) — the PERC model wins on pure payback, but TOPCon wins on long-term total return.

Yingli Model Comparison

Spec	YL580D-PERC	YL620D-TOPCon	YL660D-Bifacial
Cell type	P-type PERC	N-type TOPCon	N-type Bifacial
Efficiency	22.0%	22.7%	23.0%
Degradation	0.55%/yr	0.40%/yr	0.40%/yr
Temp coefficient	-0.34%/°C	-0.30%/°C	-0.29%/°C
Performance warranty	25 years	25 years	25 years
$/W installed	$1.95–2.25	$2.20–2.50	$2.35–2.65

FAQ

Is Yingli Solar still a reliable manufacturer? ▼

Yingli Solar (Yingli Green Energy) was once the world's #1 solar panel manufacturer (2012–2014) but faced financial difficulties between 2016–2020 due to debt restructuring. The company has since stabilized its operations, maintained manufacturing capacity in Hebei province China, and retains Bloomberg NEF Tier 1 bankability status as of 2024. Their panels continue to be bankable for commercial project financing, and their warranty obligations are backed by their manufacturing operations. As with all warranty considerations: for high-value installs, a warranty backstop insurance policy is advisable regardless of manufacturer. Yingli's current 25-year performance warranty is a standard industry guarantee.

When should I choose YL580D-PERC vs YL620D-TOPCon? ▼

Choose YL580D-PERC when: you have ample roof space (so lower watts-per-panel doesn't limit system size), electricity rate is below $0.14/kWh (lower long-term savings value doesn't justify TOPCon premium), or budget is the primary constraint. Choose YL620D-TOPCon when: roof space is limited and you need maximum watts in available area, electricity rate exceeds $0.16/kWh (making the extra 25-year kWh more valuable), you're in a hot climate (better temp coefficient -0.30 vs -0.34%/°C), or you want a 15-year vs 12-year product warranty. The TOPCon premium is typically $200–400 for an 8–10 kW system and pays back in 5–8 years of additional production at average electricity rates.

How does Yingli compare to JA Solar and Longi? ▼

JA Solar and Longi rank higher in shipment volume and PVEL scorecard performance data than Yingli's current product lineup. Longi Hi-MO 7 and JA Solar DeepBlue 4.0 Pro generally show slightly lower degradation rates in independent testing. However, Yingli panels are typically priced $0.10–0.20/W lower than equivalent JA/Longi models — making them a genuine value play for budget-sensitive residential and commercial buyers. All three brands hold Tier 1 Bloomberg NEF status. For most residential installs, the choice between Yingli, JA Solar, and Longi comes down to which your local installer can source at competitive pricing, rather than meaningful technical differences.

What does Yingli's 25-year performance warranty cover? ▼

Yingli's 25-year performance warranty guarantees output will not fall below 80.7% of rated power at year 25, following a linear degradation schedule. For TOPCon models (0.40%/yr), actual output at year 25 should be approximately 91.4% — well above the 80.7% floor, leaving a large safety margin. For PERC models (0.55%/yr), year 25 output is approximately 87.2% — still comfortably above the guarantee threshold. The product (workmanship) warranty is 12 years for PERC and 15 years for TOPCon models, covering physical defects and manufacturing failures separate from gradual output decline.

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