The assessment
How it scores, by category
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
- 415–420 W
- Electrical layer
- DC module output
- Construction
- Not recorded
Performance guarantee: 25-year linear output
Wattage figure based on the sourced rated power (420 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 420 W at STC.
How this is modelled
Modelled from this panel’s own published first-year (2%) and annual (0.45%/yr) degradation figures, compounded against its 420 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 | 412 W | 404 W | 395 W | 385 W | 376 W | 366 W |
| % of rated | 98.0% | 96.2% | 94.0% | 91.7% | 89.5% | 87.2% |
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 is anchored to the highest published rating in this exact published US series. Scored model: TSP-420 · checked 2026-08-01. Evidence.
Sources & references · checked 2026-08-19
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.
Record correction. Tesla TSP-415/TSP-420 datasheet (energylibrary.tesla.com, file last_modified 31 July 2026), Tesla Solar Panel Limited Warranty (USA) Rev. 1.2 effective 2 June 2026, and Tesla's certification directory. Re-verified 2026-08-19. Corrected 2026-08-19, four defects: (1) the archived source was the WRONG PRODUCT - the older Tesla Photovoltaic Module T420S/T425S/T430S sheet, a 144-cell 2.111 m2 family the California CEC lists from 2021-07-01, not the 360-cell TSP family. It has been replaced with the live TSP datasheet. (2) `released` read 2023; the California CEC lists all six TSP models from 2025-09-22 and Tesla's FY2025 10-K puts first customer deliveries in January 2026. (3) the governing warranty was cited as effective 6 November 2025, two revisions stale. (4) warranty scope was recorded as North America; the instrument is titled (USA), names the United States, and contains no reference to Canada or North America - the NA-EN filename is misleading.
- Sourced valuesData card →
- Warranty summary25-year product warranty →
Show 3 more
- Archived copy of the primary sourcePDF ↗
- Financial strength & warranty backingManufacturer ↗
- Fire classification (IEC 61730)Manufacturer ↗
Product record history
2 changes to this record · 65 products changed in this update
6 changes to this record · 1 product changed in this update
Model
- Before
- TSP-420
- After
- TSP-420 (scored). Tesla's current warranty and the California CEC list both cover six models TSP-405, TSP-410, TSP-415, TSP-420, TSP-425 and TSP-430; the published datasheet details only TSP-415 and TSP-420.
Salt mist (IEC 61701): Evidence sources
- Before
- https://www.solarinsure.com/tesla-relaunches-solar-panel-manufacturing
- After
- https://energylibrary.tesla.com/docs/Public/Directory/en-us/GUID-43FAC585-DEF9-41A8-9646-9861560606B5.html
Source revision
- Before
- Tesla TSP-415/TSP-420 datasheet, North American warranty effective 6 November 2025 and certification directory, rechecked 2026-08-01
- After
- Tesla TSP-415/TSP-420 datasheet (energylibrary.tesla.com, file last_modified 31 July 2026), Tesla Solar Panel Limited Warranty (USA) Rev. 1.2 effective 2 June 2026, and Tesla's certification directory. Re-verified 2026-08-19. Corrected 2026-08-19, four defects: (1) the archived source was the WRONG PRODUCT - the older Tesla Photovoltaic Module T420S/T425S/T430S sheet, a 144-cell 2.111 m2 family the California CEC lists from 2021-07-01, not the 360-cell TSP family. It has been replaced with the live TSP datasheet. (2) `released` read 2023; the California CEC lists all six TSP models from 2025-09-22 and Tesla's FY2025 10-K puts first customer deliveries in January 2026. (3) the governing warranty was cited as effective 6 November 2025, two revisions stale. (4) warranty scope was recorded as North America; the instrument is titled (USA), names the United States, and contains no reference to Canada or North America - the NA-EN filename is misleading.
US Warranty scope
- Before
- North America; 25-year product and performance warranty. Tesla may repair, replace or compensate and covers reasonable certified-installer labour for valid claims during the first ten years.
- After
- United States only. Tesla Solar Panel Limited Warranty (USA) Rev. 1.2, effective 2 June 2026, names TSP-405 through TSP-430 and provides 25-year product and 25-year performance cover: at least 98% of rated power in year one, then no more than 0.45% decline per year, reaching at least 87.2% at year 25. Tesla may repair, replace or compensate, and covers reasonable certified-installer labour for valid claims during the first ten years. The document is titled (USA) and does not name Canada; the earlier 'North America' scope recorded here came from the NA-EN filename, not the instrument.
US Evidence sources
- Before
- https://energylibrary.tesla.com/docs/Public/Directory/en-us/GUID-43FAC585-DEF9-41A8-9646-9861560606B5.html; https://energylibrary.tesla.com/docs/Public/Solar/Retrofit/Datasheet/TeslaPanelMount/DatasheetTeslaSolarPanel.pdf; https://energylibrary.tesla.com/docs/Public/Solar/Retrofit/Warranty/en-us/Tesla_Solar_Panel_Warranty_NA-EN.pdf
- After
- https://energylibrary.tesla.com/docs/Public/Directory/en-us/GUID-43FAC585-DEF9-41A8-9646-9861560606B5.html; https://energylibrary.tesla.com/docs/Public/Solar/Retrofit/Datasheet/TeslaPanelMount/DatasheetTeslaSolarPanel.pdf; https://energylibrary.tesla.com/docs/Public/Solar/Retrofit/Warranty/en-us/Tesla_Solar_Panel_Warranty_NA-EN.pdf; https://solarequipment.energy.ca.gov/Home/PVModuleList
1 change to this record · 106 products changed in this update
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
- AU market evidence checked
- Series benchmark evidence checked
- Plain-language warranty summary checked
Scored by Solar Analytica Research
Further reading from Findings
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New scorecards, score changes and market signals, published as they happen.
Our reading
Its strongest scoring dimension is guarantee & backbone (66). Efficiency & Yield (43) is the dimension with the most room to move. Underlying specifications include a module efficiency of 20.5%, 25-year product warranty backed by a 25-year performance term.