44.7″ · 1,135 mm wide · 1.57″ (40 mm) frame · 49.2 lb (22.3 kg)

Solar panelTesla

Tesla TSP 420

Name: Tesla TSP 420
Brand: Tesla

360 cells. Power classes 405–430 W in the CEC list; datasheet covers 415–420 W.

CEC listed · Sep 22, 2025UL 6173025-yr product + 25-yr performance warrantyInstalled in 24 SoCal permits

Power class

Power (STC)420 Wtolerance +5 / −0 W
Efficiency≥20.5%datasheet minimum
%/°C Pmax−0.34CEC test: −0.345
Degradation / yr0.45%after year 1 (warranty)

Power classes

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation · Tesla datasheet · 6 models

Model	Pmax	Voc, V	Isc, A	Vmp, V	Imp, A	Efficiency	PTC	CEC listed
TSP-405	405 W	40.87	12.74	34.15	11.86	≈19.8%	381 W	Sep 22, 2025
TSP-410	410 W	40.90	12.83	34.20	11.90	≈20.0%	386 W	Sep 22, 2025
TSP-415	415 W	40.92	12.93	34.24	12.12	≥20.3%	391 W	Sep 22, 2025
TSP-420	420 W	40.95	13.03	34.29	12.25	≥20.5%	395 W	Sep 22, 2025
TSP-425	425 W	40.98	13.12	34.33	12.38	≈20.7%	400 W	Sep 22, 2025
TSP-430	430 W	41.01	13.20	34.43	12.49	≈21.0%	405 W	Sep 22, 2025

≈ efficiency = Pmax ÷ panel area 2.049 m² (datasheet size) for classes outside the datasheet.

Build & dimensions

Tesla datasheet · Cali-Graf calculation · CEC PV Module List (Oct 7, 2026)

Dimensions71.1 × 44.7 × 1.57 in1,805 × 1,135 × 40 mm
Module area2.05 m² (22.1 ft²)length × width
Weight49.2 lb (22.3 kg)
Cells360 cells
Front glass0.13 in (3.2 mm) thermally pre-stressed
Back coverWhite backsheet
FrameBlack Anodized Aluminum Alloy
Junction boxIP68, 3 diodes
Cable / connector4 mm2 | 12 AWG, 1000 mm | 39.4 in. · Staubli MC4

Heat & cold behaviour

Tesla datasheet · CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation

	Datasheet	CEC listing test
Pmax coefficient γ	−0.34 %/°C	−0.345 %/°C
Voc coefficient β	−0.27 %/°C	−0.261 %/°C
Isc coefficient α	+0.04 %/°C	+0.045 %/°C
Vmp coefficient	≈ −0.38 %/°C	—
Operating cell temperature	—	NOCT 42.8 °C

Vmp coefficient ≈ γ − α (datasheet); used only for the hot-roof voltage estimate.

Away from lab conditions — CEC listing test points

Class	Pmax at NOCT	Vmp × Imp at NOCT	Pmax at 200 W/m²	Low-light efficiency vs STC
405 W	304.1 W	31.75 V × 9.58 A	77.8 W	96%
410 W	305.6 W	31.8 V × 9.61 A	78.2 W	95%
415 W	311.6 W	31.84 V × 9.79 A	79.7 W	96%
420 W	315.4 W	31.88 V × 9.89 A	80.7 W	96%
425 W	319.1 W	31.92 V × 10 A	81.6 W	96%
430 W	322.9 W	32.01 V × 10.09 A	82.6 W	96%

Pmax = Vmp × Imp from the CEC listing; low-light efficiency = Pmax at 200 W/m² ÷ (20% of STC Pmax).

Electrical & strength ratings

Max system voltage1,000 V
Max series fuse25 A
Fire rating (UL 61730)Type 2
Module temperature−40 °F to +185 °F−40 °C to +85 °C
Hail35 mm (1.38 in) at 27 km/h
Power tolerance+5 / −0 W

Certifications

CEC PV Module List (Oct 7, 2026) · Tesla datasheet

UL 61730IEC 61215Fire rating Type 2 (UL 61730)

UL 61730CEC listing
IEC 61215datasheet
Fire rating Type 2 (UL 61730)datasheet

Warranty & degradation

Tesla datasheet · Cali-Graf calculation

Product warranty25 years
Performance warranty25 years
Year 1≥ 98%
Then≤ 0.45% / year
Year 10≥ 93.95%calculated from warranty terms
Year 25≥ 87.2%

Inverter compatibility & string sizing

Tesla datasheet · Cali-Graf calculation · NLR PVWatts v8 · CEC PV Module List (Oct 7, 2026) · inverter datasheets · NLR SAM inverter library · CEC Grid Support Inverter List (Oct 7, 2026)

CityColdest air, °CHottest cell, °CString inverter

43.5 V

Voc when cold

per panel

27.9 V

Vmp when hot

per panel

Max panels / string

max DC 600 V

Min panels / string

MPPT from 60 V

Defaults come from NLR TMY weather (coldest hour, hottest modeled cell). Code calculations (NEC 690.7) use the ASHRAE extreme annual minimum, which is usually colder — enter it above.

String inverters most named in SoCal permits

Inverter	Max DC input	MPPT	Window source	Panels per string
Tesla 1538000-xx-y	600 V	60–480 V	datasheet	3–13
Solis (Ginlong) S6-EH1P10K-H-US	600 V	80–520 V	datasheet	3–13
Solis (Ginlong) Solis-1P7.6K-4G-US	600 V	100–500 V	datasheet	4–13
Qcells Q.VOLT H7.6SX	498 V	234–498 V	CEC test window	9–11

Microinverters (one per panel)

Microinverter	Recommended module power	Max DC input	MPPT	Voc cold / Vmp hot	Check	DC/AC
Enphase IQ8PLUS-72-2-US	235–440 W	60 V	29–45 V	43.5 / 27.9 V	⚠ Works; below MPPT at peak heat	1.45
Enphase IQ8X-80-M-US	320–540 W	79.5 V	43–60 V	43.5 / 27.9 V	✗ Not a match: module voltage below MPPT range	1.11
APsystems (Alt Power System) DS3-L	265–570 W	60 V	28–45 V	43.5 / 27.9 V	⚠ Works; below MPPT at peak heat	0.54
Enphase IQ8M-72-2-US	260–460 W	60 V	30–45 V	43.5 / 27.9 V	⚠ Works; below MPPT at peak heat	1.29
Enphase IQ8A-72-2-US	295–500 W	60 V	32–45 V	43.5 / 27.9 V	⚠ Works; below MPPT at peak heat	1.2

Voltage check against the microinverter datasheets — confirm the pairing on the manufacturer’s module compatibility list. Rows appear only when the panel’s power is inside the microinverter’s recommended module power range.

SolarEdge and other optimizer-based systems size strings by the optimizer rules — use the manufacturer’s designer. Reference inverters: most named in SoCal permits since Oct 2024.

Expected production in Southern California

NLR PVWatts v8 · Cali-Graf calculation

PanelsCity for chartSystem size

City	kWh / kW / yr	kWh / panel / yr	kWh / system / yr	Sun, kWh/m²/day
Los Angeles	1,676	704	11,967	6.08
Palmdale	1,835	771	13,102	6.69
Chula Vista	1,696	712	12,109	6.11
Huntington Beach	1,643	690	11,731	5.89
Riverside	1,696	712	12,109	6.21
Santa Clarita	1,724	724	12,309	6.28

Estimate for comparison, not a quote: shading, roof orientation and local losses change real output. Roof mount, 20° tilt, south, 14% system losses.

Who installs TSP panels in SoCal

building permits · CSLB License Master

Permits naming this series

Oct 2025 – Sep 2026

Licensed installers

CSLB license on the permit

Jurisdictions so far

Palmdale (24)

Tesla Energy Operations Inc

Fremont · CSLB #888104

20 installsOct 2025 – Sep 2026Palmdale

Solar Shoppers Construction

Palmdale · CSLB #1019939

4 installsMar 2026 – Aug 2026Palmdale

Permits over time

Top ZIP codes

ZIP 9355117
ZIP 935504
ZIP 935523

Typical system

median 8.8 kW, 21 panels (n = 23)

Only installer and ZIP level is shown — no homeowner names, street addresses or permit numbers. Counts grow as more permit portals are loaded.

Installed together with

building permits

Batteries

Tesla Powerwall 3

Tesla Powerwall 3 Expansion

Number of permits naming both this panel series and the product; 24 of 24 permits list other equipment.

Compare with similar 420 W panels

CEC PV Module List (Oct 7, 2026) · datasheets · Kiwa PVEL Scorecard · building permits

Panel	Pmax	Efficiency	γ Pmax (CEC)	Voc, V	Isc, A	Warranty	PVEL (product / brand)	SoCal permits (series)
Tesla TSP 420	420 W	≥20.5%	−0.345	40.95	13.03	25 / 25 yr	—	24
Qcells Q.PEAK DUO BLK ML-G10+ 415	415 W	≈21.1%	−0.337	45.41	11.23	25 / 25 yr	product 2022, 2023	221
LONGi LR5-54HABB-415M	415 W	≈21.8%	−0.342	37.77	13.94	—	brand 9× (2017–2026)	64
Canadian Solar CS3N-420MS	420 W	≥20.7%	−0.332	45.3	11.74	25 yr	product 2023	46

Same fields from the same sources for every row; ≈ efficiency is calculated from the listed area. Comparable series: other brands, same product group, power range covering this class.

Documents

manufacturer documents

PDF
Tesla Solar Panel Datasheet
Datasheet · Tesla · Aug 2026

Questions & answers

How efficient is the Tesla TSP 420?

The Tesla datasheet guarantees at least 20.5% module efficiency for the 420 W class. 420 W over 2.05 m² equals about 205 W per square meter.

How much energy does one panel produce in Los Angeles or Palmdale?

PVWatts v8 with typical-year weather gives about 704 kWh per year per 420 W panel in Los Angeles and about 771 kWh in Palmdale (20° roof, facing south, 14% system losses).

How much power does it lose on a hot roof?

With γ = −0.34 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 17.6% below the STC rating.

How many panels fit on one string?

With the Tesla 1538000-xx-y (max DC 600 V, MPPT from 60 V, datasheet) in Los Angeles the calculator gives 3–13 panels per string (Voc at 2 °C = 43.5 V, Vmp at 74 °C cell = 27.9 V). Final design must follow the inverter manual and NEC 690.7.

What does the warranty cover?

25 years on the product and 25 years on performance: at least 98% of rated power in year 1, then no more than 0.45% per year — at least 87.2% after 25 years (manufacturer datasheet).

How big and heavy is it?

71.1 × 44.7 × 1.57 in (1,805 × 1,135 × 40 mm), 49.2 lb (22.3 kg).

What fire rating does it have?

UL 61730 fire rating Type 2 per datasheet.

Who installs it in Southern California?

Building permits name this series 24 times (Oct 2025 – Sep 2026). The most active licensed installers are Tesla Energy Operations Inc, Solar Shoppers Construction.

Sources

California Energy Commission — Solar Equipment Lists, PV Module List, Inverter List (snapshot Oct 7, 2026).
Tesla — datasheet Tesla Solar Panel Datasheet.
Qcells — manufacturer datasheet “Q.PEAK DUO BLK ML-G10+ ENDURING HIGH PERFORMANCE”.
Canadian Solar — manufacturer datasheet “HiKu Mono PERC CS3N-400|405|410|415|420|425MS MORE POWER”.
Tesla — document library on the manufacturer’s website (links above).
Kiwa PVEL — PV Module Reliability Scorecard, Top Performer lists.
NLR (formerly NREL) — System Advisor Model CEC inverter library (version 2026.7.3).
NLR (formerly NREL) — PVWatts v8, NSRDB PSM v3 typical-year weather for Los Angeles, Palmdale, Chula Vista, Huntington Beach, Riverside, Santa Clarita.
Inverter datasheets — APsystems (Alt Power System), Enphase, Solis (Ginlong), Tesla (manufacturer documents).
Building permits — City of Palmdale (Oct 2025 – Sep 2026). Equipment matched from permit descriptions by model number.
Contractors State License Board — License Master (contractor names and license status), as of Oct 5, 2026.
Cali-Graf calculations — formulas and inputs are shown next to each calculated value (efficiency from area, temperature-corrected voltages, string sizing, energy estimates).