The assessment
How it scores, by category
Market position
The data
Solar module
Produces DC electricity at the roof. It contains no system-level power conversion or storage.
- Product role
- None in the module.
- Published range
- 645–660 W
- Electrical layer
- DC module output
- Construction
- Bifacial, Dual-glass
Performance guarantee: 30-year linear output
Wattage figure based on the sourced rated power (660 W) applied to the guaranteed floor; modular/format differences aside, this is the same rated-power spec shown above.
Modelled effective output, year by year
Year 1 to year 25. Rated 660 W at STC.
How this is modelled
Modelled from this panel’s own published first-year (1%) and annual (0.35%/yr) degradation figures, compounded against its 660 W rated (STC) output. This is a datasheet-derived estimate, not a field measurement or a warranty guarantee. Actual output also depends on site irradiance, temperature, soiling and system design.
| Year | 1 | 5 | 10 | 15 | 20 | 25 |
|---|---|---|---|---|---|---|
| Watts | 653 W | 644 W | 633 W | 621 W | 610 W | 598 W |
| % of rated | 99.0% | 97.6% | 95.8% | 94.1% | 92.3% | 90.6% |
Verification & sources
Market context
Global evidencechange in the site menu
Global benchmark. This scorecard is benchmarked globally. A global score does not imply local availability, certification, warranty coverage, or installer compatibility.
Benchmark anchor. The score uses the highest exact bin inside the retained Australian regulator intersection. Scored model: AIKO-A660-GRH66Dw · checked 2026-08-21. Evidence.
Sources & references · checked 2026-09-01
Strong evidence coverage
18 of 18 scored criteria link directly to a published source.
Values marked estimated, derived, or not found remain visible on the audit sheet and do not carry the same evidential weight as a linked source. Coverage measures direct links, not an independent guarantee that a claim is correct.
How far the evidence reaches
- OutputThird-party source1 of 5 rows in the rings beyond claim4 warranty terms beside the rings
- EnduranceManufacturer claim3 rows in the rings
- SafetyNot assessed for panels
- BackingWarranty terms: the maker's commitment2 warranty terms beside the rings
- FitManufacturer claim1 row in the rings3 design facts beside the rings
- FootprintNot assessed for panels
Rings, outside in: manufacturer claim, certified or regulator-listed, third-party source. The centre is review.solar's own measurement, empty for every product today. Warranty terms and design facts that rest on the maker's own word are counted beside the rings; a reviewed absence, or one that reaches beyond the maker's claim, stays in them. How the evidence puzzle works
Record revision. Built from the exact manufacturer sheet and the CER export checked 2026-08-12. The global sheet spans 645-680 W; the retained Australian intersection is 645-660 W. GRH66Dw also labels another current Stellar generation, but the 80 +/- 5% bifacial factor and +70 C upper operating limit make this a distinct evidence object. First-market US and DE overlay review 2026-09-01: official regional catalogues recorded; Australian overlays and scores unchanged.
- Sourced valuesData card →
- Archived copy of the primary sourcePDF ↗
Show 2 more
- Independent energy yieldManufacturer ↗
- Independent energy yieldIndustry report ↗
Product record history
4 changes to this record · 8 products changed in this update
DE Evidence sources
- Before
- https://aikosolar.com/de/products/; https://aikosolar.com/de/products/stellar-2nplus66-dual-glass/; https://aikosolar.com/wp-content/uploads/2026/09/Stellar-2NPlus66_AIKO-A-GRH66Dw-645-680W_2382x1134x30mm_202608_V4.1_DE.pdf
- After
- https://aikosolar.com/de/products/; https://aikosolar.com/de/products/resources-center/; https://aikosolar.com/de/products/stellar-2nplus66-dual-glass/; https://aikosolar.com/wp-content/uploads/2025/11/WI-0BQM-M006-N-Type-ABC-Modulgarantie%EF%BC%88Standardmodule%EF%BC%89-1.6-DE.docx; https://aikosolar.com/wp-content/uploads/2026/09/Stellar-2NPlus66_AIKO-A-GRH66Dw-645-680W_2382x1134x30mm_202608_V4.1_DE.pdf
DE Warranty scope
- Before
- Germany; no German warranty naming AIKO-A660-GRH66Dw was attached, so six-field terms are not transferred from the Australian N-Type ABC instrument.
- After
- Germany. The German N-Type ABC Modulgarantie (Standardmodule), version 1.6-DE as named in its file name, is listed under Garantiebedingungen in AIKO's German resource centre with a date of 22 November 2025. Clause 1 names AIKO-Axxx-GRH66Dw. The document prints no territorial scope, effective date or internal revision and does not separate the Stellar 1N+66 and 2N+66 generations, which share the code. AIKO's German Stellar 2N+66 page and datasheet link no warranty document. The warranty start date takes effect within 30 days after delivery or within 90 days after factory shipment, whichever occurs first (clause 2). The six warranty terms are taken from this document and match the English Utility-Scale Module Warranty 1.6 on those terms. The German datasheet names AIKO-A660-GRH66Dw with 15-year product and 30-year performance periods but states no warranty terms.
DE Warranty confirmation
- Before
- unconfirmed
- After
- No longer recorded
DE Warranty conditions
- Before
- Not previously recorded
- After
- labour: The German warranty states no separate labour allowance. The customer bears the costs of removing, repackaging, installing and reinstalling the modules (clause 4.4.3).; registration: Claims must be submitted in writing to AIKO or its authorised distributors within the warranty period (clause 3.1). The customer carries the burden of proof and must notify cs@aikosolar.com in writing within 30 days of becoming aware, or when it should have become aware, of the defect. The notice must give the claimant, a detailed description, supporting photos or data, module serial numbers, purchase evidence, module type, module location and any other information AIKO requests; AIKO cannot process the claim without this information (clause 3.2).; remedy: Where AIKO determines that a defect results from its own material or process problems, or a third-party test body selected jointly by the customer and AIKO finds AIKO responsible, AIKO may choose to repair the defective module (clause 4.1), replace it free of charge or supply additional modules to cover the power shortfall (clause 4.2), or refund the residual value or the value difference (clause 4.3). Repaired or replacement modules keep the original warranty period, which is not restarted or extended (clause 4.4.1).; removal reinstallation: The customer bears the costs of removing, repackaging, installing and reinstalling the modules (clause 4.4.3). The warranty does not apply where the modules are removed from the original installation location or the project site is changed without AIKO's written approval (clause 5.12).; transferability: Transfer to a new owner requires AIKO's agreement and a signed tripartite agreement (clause 7.1). The modules must remain intact and non-removable at the original installation location, there must be no arrears or other liabilities (such as damages) under the Module Sales Contract, and the new owner is bound by all terms, the whole warranty being transferred and not a part of it (clauses 7.1.1 to 7.1.3). Any other transfer is not binding on AIKO (clause 7.3).; transport: Unless otherwise agreed between the parties, AIKO transports repaired or replacement modules to the same destination under the trade terms of the original sales contract, and the premium, freight, customs clearance fee and other reasonable expenses follow those terms; the customer must contact AIKO in advance and provide the service providers' invoices to apply for reimbursement (clause 4.4.3). If the modules must be sent to a third party for inspection, the customer pays the test fee provisionally, and AIKO bears the test fee and inspection freight only where AIKO is found responsible (clause 4.4.2).
1 change to this record · 12 products changed in this update
DE Evidence sources
- Before
- https://aikosolar.com/de/products/; https://aikosolar.com/de/products/stellar-2nplus66-dual-glass/; https://aikosolar.com/wp-content/uploads/2025/04/Stellar-2NPlus66_AIKO-A-GRH66Dw_645-680W_2382x1134x30mm_202601_V5.1_DE.pdf
- After
- https://aikosolar.com/de/products/; https://aikosolar.com/de/products/stellar-2nplus66-dual-glass/; https://aikosolar.com/wp-content/uploads/2026/09/Stellar-2NPlus66_AIKO-A-GRH66Dw-645-680W_2382x1134x30mm_202608_V4.1_DE.pdf
4 changes to this record · 23 products changed in this update
Hail resistance: Evidence sources
- Before
- https://aikosolar.com/wp-content/uploads/2026/06/Stellar-2NPlus66_AIKO-A-GRH66Dw-645-680W_2382x1134x30mm_202601_V5.1_EN.pdf
- After
- https://aikosolar.com/wp-content/uploads/2026/03/Stellar-2NPlus66_AIKO-A-GRH66Dw-645-680W_2382x1134x30mm_202601_V5.1_ANZ.pdf
Hail resistance
- Before
- IEC 61215 standard (25mm)
- After
- Enhanced hail 35mm certified
1 change to this record · 4 products changed in this update
AU Certifications
- Current text
- The CER module export of 24 September 2026 and the live CER file last modified 2 October 2026, list AIKO-A640-GRH66Dw, AIKO-A645-GRH66Dw, AIKO-A650-GRH66Dw, AIKO-A655-GRH66Dw and AIKO-A660-GRH66Dw under IEC 61215-2021, approved 12 June 2025, expiring 12 June 2028, fire tested Yes. No AIKO-A665-GRH66Dw to AIKO-A680-GRH66Dw rows are listed. The listed set matches the 640 to 660 W columns of AIKO's Australian-market Stellar 1N+66 sheet (V1.1_202501), not the 645 to 680 W range of the Stellar 2N+66 sheet. The registry model string is shared by both generations, so CER approval of the Stellar 2N+66 generation specifically is not publicly established.
The previous text is not reproduced here: both versions run to a full research paragraph. Both are in the JSON record linked below.
Hail resistanceAU market evidence+6 in JSON record
4 changes to this record · 7 products changed in this update
AU Support Note
- Before
- The approval model code is current, but it does not distinguish AIKO's 1N+66 and 2N+66 catalogue labels. Exact distributor stock and continuous availability remain unknown.
- After
- The approval model code is current, but it does not distinguish AIKO's 1N+66 and 2N+66 catalogue labels. AIKO's Australian site lists Stellar 2N+66 Dual-Glass 645W-680W (AIKO-A-GRH66Dw) with an Australia and New Zealand datasheet, the Utility-Scale Module Warranty 1.6 and a Hail Testing link to Kiwa PVEL report R9530E-1. That report tests AIKO-A645-GRH66Dw BOM 1 samples against customer-supplied datasheet values that match AIKO's Australian-market Stellar 1N+66 sheet (V1.1_202501), not the Stellar 2N+66 sheet, so it is not transferred to this record. AIKO Australia lists a Melbourne office address and the service address aus.service@aikosolar.com. Exact distributor stock and continuous availability remain unknown.
AU Warranty scope
- Before
- The Utility-Scale Module Warranty 1.6 names GRH66Dw and provides 15 years of product cover and 30 years of performance cover.
- After
- The Utility-Scale Module Warranty 1.6 names AIKO-Axxx-GRH66Dw (dual-glass bifacial) and provides 15 years of product cover and 30 years of performance cover. AIKO's Australian Stellar 2N+66 page links this document as its warranty. The document prints no revision or effective date, states no territorial scope, and does not separate the 1N+66 and 2N+66 generations.
AU Evidence sources
- Before
- https://aikosolar.com/wp-content/uploads/2025/11/Utility%E2%80%91Scale-Module-Warranty-1.6-EN.pdf; https://aikosolar.com/wp-content/uploads/2026/06/Stellar-2NPlus66_AIKO-A-GRH66Dw-645-680W_2382x1134x30mm_202601_V5.1_EN.pdf; https://cer.gov.au/document/cec-approved-pv-modules-0; https://cer.gov.au/document_page/cec-approved-pv-modules
- After
- https://aikosolar.com/au/products/stellar-2nplus66-dual-glass/; https://aikosolar.com/wp-content/uploads/2025/06/Stellar-1NPlus66_AIKO-A-GRH66Dw-635-665W_2382x1134x30mm_V1.1_202501_DsDr_EN.pdf.pdf; https://aikosolar.com/wp-content/uploads/2025/11/Utility%E2%80%91Scale-Module-Warranty-1.6-EN.pdf; https://aikosolar.com/wp-content/uploads/2025/12/T-94-PVEL_R9530E-1_AIKO-A-GRH66Dw_-Hail-35mm.pdf; https://aikosolar.com/wp-content/uploads/2026/03/Stellar-2NPlus66_AIKO-A-GRH66Dw-645-680W_2382x1134x30mm_202601_V5.1_ANZ.pdf; https://aikosolar.com/wp-content/uploads/2026/06/Stellar-2NPlus66_AIKO-A-GRH66Dw-645-680W_2382x1134x30mm_202601_V5.1_EN.pdf; https://cer.gov.au/document/cec-approved-pv-modules-0; https://cer.gov.au/document_page/cec-approved-pv-modules
AU Certifications
- Current text
- The CER module export pinned at 24 September 2026 (captured 29 September 2026), and the live CER file last modified 2 October 2026, list AIKO-A640-GRH66Dw, AIKO-A645-GRH66Dw, AIKO-A650-GRH66Dw, AIKO-A655-GRH66Dw and AIKO-A660-GRH66Dw under IEC 61215-2021, approved 12 June 2025, expiring 12 June 2028, fire tested Yes. No AIKO-A665-GRH66Dw to AIKO-A680-GRH66Dw rows are listed. The listed set matches the 640 to 660 W columns of AIKO's Australian-market Stellar 1N+66 sheet (V1.1_202501), not the 645 to 680 W range of the Stellar 2N+66 sheet. The registry model string is shared by both generations, so CER approval of the Stellar 2N+66 generation specifically is not publicly established.
The previous text is not reproduced here: both versions run to a full research paragraph. Both are in the JSON record linked below.
Hail resistanceAU market evidence+6 in JSON record
1 change to this record · 32 products changed in this update
DE Warranty confirmation
- Before
- Not previously recorded
- After
- unconfirmed
10 changes to this record · 152 products changed in this update
US Support Note
- Before
- Not previously recorded
- After
- aikosolar.com/us/products/ serves the English global product index (canonical /en/products/), not a United States catalogue. AIKO-A660-GRH66Dw is not named on a US-specific sale path. The Australian N-Type ABC warranty is not transferred.
DE Evidence sources
- Before
- Not previously recorded
- After
- https://aikosolar.com/de/products/; https://aikosolar.com/de/products/stellar-2nplus66-dual-glass/; https://aikosolar.com/wp-content/uploads/2025/04/Stellar-2NPlus66_AIKO-A-GRH66Dw_645-680W_2382x1134x30mm_202601_V5.1_DE.pdf
Source revision
- Current text
- Built from the exact manufacturer sheet and the CER export checked 2026-08-12. The global sheet spans 645-680 W; the retained Australian intersection is 645-660 W. GRH66Dw also labels another current Stellar generation, but the 80 +/- 5% bifacial factor and +70 C upper operating limit make this a distinct evidence object. First-market US and DE overlay review 2026-09-01: official regional catalogues recorded; Australian overlays and scores unchanged.
The previous text is not reproduced here: both versions run to a full research paragraph. Both are in the JSON record linked below.
Primary datasheetDE Status
- Before
- Not previously recorded
- After
- available
US Evidence sources
- Before
- Not previously recorded
- After
- https://aikosolar.com/en/products/; https://aikosolar.com/us/products/
DE Certifications
- Before
- Not previously recorded
- After
- The German Stellar 2N+66 page and German datasheet name AIKO-A-GRH66Dw 645-680W, including AIKO-A660-GRH66Dw.
DE Warranty scope
- Before
- Not previously recorded
- After
- Germany; no German warranty naming AIKO-A660-GRH66Dw was attached, so six-field terms are not transferred from the Australian N-Type ABC instrument.
DE Support Note
- Before
- Not previously recorded
- After
- aikosolar.com/de/products/stellar-2nplus66-dual-glass/ stays on the German host and names STELLAR 2N+66 Doppelglas 645W-680W. The linked German datasheet names AIKO-A660-GRH66Dw. Stellar 1N+66 uses the same GRH66Dw code on an Auslaufmodell card and is not transferred onto this 2N+66 record. Manufacturer listing is established; distributor inventory is not inferred.
2 changes to this record · 109 products changed in this update
5 changes to this record · 118 products changed in this update
Independent energy yield
- Before
- Not previously recorded
- After
- Brand or series yield-tested; exact model not covered
Independent energy yield: Evidence status
- Before
- Not previously recorded
- After
- sourced
Independent energy yield: Evidence sources
- Before
- Not previously recorded
- After
- https://aikosolar.com/au/news-aiko-claims-top-spot/; https://www.pv-magazine.com/2023/11/09/pv-magazine-test-september-2023-results/
1 change to this record · 8 products changed in this update
Product record
kind: panel; brand: AIKO; name: Stellar 2N+66 Dual-Glass; model: AIKO-A645-GRH66Dw through AIKO-A660-GRH66Dw (132 half-cells, N-type ABC rear-contact, bifacial dual glass); scored model AIKO-A660-GRH66Dw; score: 68.5
Primary datasheet
This is review.solar's publication history. It does not claim the product changed on the recorded date, and it excludes compatibility, system pairing, installation suitability and relative leaderboard prose. Open the complete JSON record.
Evidence timeline
Recorded verification events for this scorecard. These are evidence checks, not historical score snapshots.
- Core scorecard evidence checked
- US market evidence checked
- DE market evidence checked
- AU market evidence checked
- Series benchmark evidence checked
Scored by Solar Analytica Research
Further reading from Findings
- What changed in the benchmark in August 2026. · 7 min read
Stay across the benchmark.
New scorecards, score changes and market signals, published as they happen.
Our reading
Stellar 2N+66 Dual-Glass scores 68, placing 21 of 53 in the Premium Performance class against a class average of 67.9. Its strongest scoring dimension is architecture & design (94), running 8.0 points above the class average on this dimension. Guarantee & Backbone scores 44, the lowest pillar for this product. The class average on guarantee & backbone is 55. Underlying specifications include a module efficiency of 24.4%, N-type ABC cell technology, 15-year product warranty backed by a 30-year performance term.
Dietreich Farquharson · review.solar