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Illustration · 112 cells
Solar panelMaxeon Solar Technologies

Maxeon Solar Technologies SPR-MAX3 420

112 cells. Power classes 400–435 W in the CEC list; datasheet covers 415–430 W.

CEC listed · Apr 14, 2023UL 61730Made in Philippines
Power class
  • Power (STC)420 Wtolerance +5 / −0 %
  • Efficiency≈22.1%calculated from area
  • %/°C Pmax−0.272CEC listing test
  • Degradation / yr0.25%after year 1 (warranty)

Power classes

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation · Maxeon Solar Technologies datasheet · 7 models
ModelPmaxVoc, VIsc, AVmp, VImp, AEfficiencyPTCCEC listed
SPR-MAX3-400400 W81.096.5367.985.88≈21.1%379 WApr 14, 2023
SPR-MAX3-410410 W6.536.5468.795.96≈21.6%389 WApr 14, 2023
SPR-MAX3-415415 W81.236.5569.206.00≥21.9%394 WApr 14, 2023
SPR-MAX3-420420 W81.276.5669.616.03≈22.1%399 WApr 14, 2023
SPR-MAX3-425425 W81.326.5770.016.07≥22.4%404 WApr 14, 2023
SPR-MAX3-430430 W81.366.5770.426.11≥22.7%408 WApr 14, 2023
SPR-MAX3-435435 W81.406.5870.806.14≈22.9%413 WApr 14, 2023
≈ efficiency = Pmax ÷ CEC-listed area 1.9 m² for classes outside the datasheet.

Build & dimensions

CEC PV Module List (Oct 7, 2026) · Maxeon Solar Technologies datasheet

Heat & cold behaviour

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation
CEC listing test
Pmax coefficient γ−0.272 %/°C
Voc coefficient β−0.233 %/°C
Isc coefficient α+0.056 %/°C
Operating cell temperatureNOCT 45 °C
Vmp coefficient ≈ γ − α (CEC); used only for the hot-roof voltage estimate.

Away from lab conditions — CEC listing test points

ClassPmax at NOCTVmp × Imp at NOCTPmax at 200 W/m²Low-light efficiency vs STC
400 W303.1 W63.6 V × 4.77 A75.2 W94%
410 W310.9 W64.36 V × 4.83 A77.1 W94%
415 W314.8 W64.74 V × 4.86 A78.1 W94%
420 W318.3 W65.13 V × 4.89 A78.9 W94%
425 W322.2 W65.5 V × 4.92 A79.9 W94%
430 W326.2 W65.88 V × 4.95 A80.9 W94%
435 W329.6 W66.24 V × 4.98 A81.8 W94%
Pmax = Vmp × Imp from the CEC listing; low-light efficiency = Pmax at 200 W/m² ÷ (20% of STC Pmax).

Electrical & strength ratings

Certifications

CEC PV Module List (Oct 7, 2026) · Maxeon Solar Technologies datasheet
UL 61730IEC 61215IEC 61730IEC 61701IEC 62716IEC 62804IEC 60068ISO 14001ISO 45001ISO 9001

Warranty & degradation

Maxeon Solar Technologies datasheet

Independent reliability testing

Kiwa PVEL Scorecard
8
PVEL Scorecards
Maxeon Solar Technologies named Top Performer, 2017–2025
This exact series is not listed in published PVEL Top Performer tables. Results below are for the manufacturer.

Inverter compatibility & string sizing

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation · NLR PVWatts v8 · inverter datasheets · NLR SAM inverter library · CEC Grid Support Inverter List (Oct 7, 2026)
85.6 V
Voc when cold
per panel
58.4 V
Vmp when hot
per panel
7
Max panels / string
max DC 600 V
2
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. β is the CEC-measured coefficient; NEC 690.7 calculations use the datasheet value.

String inverters most named in SoCal permits

InverterMax DC inputMPPTWindow sourcePanels per string
Tesla 1538000-xx-y600 V60–480 Vdatasheet2–7
Solis (Ginlong) S6-EH1P10K-H-US600 V80–520 Vdatasheet2–7
Solis (Ginlong) Solis-1P7.6K-4G-US600 V100–500 Vdatasheet2–7
Qcells Q.VOLT H7.6SX498 V234–498 VCEC test window5–5

Microinverters (one per panel)

MicroinverterRecommended module powerMax DC inputMPPTVoc cold / Vmp hotCheckDC/AC
Enphase IQ8PLUS-72-2-US235–440 W60 V29–45 V85.6 / 58.4 V✗ Not allowed: cold Voc above max input1.45
Enphase IQ8X-80-M-US320–540 W79.5 V43–60 V85.6 / 58.4 V✗ Not allowed: cold Voc above max input1.11
APsystems (Alt Power System) DS3-L265–570 W60 V28–45 V85.6 / 58.4 V✗ Not allowed: cold Voc above max input0.54
Enphase IQ8M-72-2-US260–460 W60 V30–45 V85.6 / 58.4 V✗ Not allowed: cold Voc above max input1.29
Enphase IQ8A-72-2-US295–500 W60 V32–45 V85.6 / 58.4 V✗ Not allowed: cold Voc above max input1.2
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
CitykWh / kW / yrkWh / panel / yrkWh / system / yrSun, kWh/m²/day
Los Angeles1,67670411,9676.08
Palmdale1,83577113,1026.69
Chula Vista1,69671212,1096.11
Huntington Beach1,64369011,7315.89
Riverside1,69671212,1096.21
Santa Clarita1,72472412,3096.28
781Jan782Feb1,003Mar1,108Apr1,095May1,163Jun1,225Jul1,240Aug1,084Sep956Oct822Nov711DeckWh per month · Los Angeles
Estimate for comparison, not a quote: shading, roof orientation and local losses change real output. Roof mount, 20° tilt, south, 14% system losses.

Other versions of this panel

CEC PV Module List (Oct 7, 2026)
Maxeon Solar Technologies SPR-MAX3-xxx-BLK
Color version · 395–420 W · listed 2023

Compare with similar 420 W panels

CEC PV Module List (Oct 7, 2026) · datasheets · Kiwa PVEL Scorecard · building permits
PanelPmaxEfficiencyγ Pmax (CEC)Voc, VIsc, APVEL (product / brand)SoCal permits (series)
Maxeon Solar Technologies SPR-MAX3 420420 W≈22.1%−0.27281.276.56brand 8×—
Qcells Q.PEAK DUO BLK ML-G10+ 415415 W≈21.1%−0.33745.4111.23product 2022, 2023221
LONGi LR5-54HABB-415M415 W≈21.8%−0.34237.7713.94brand 9× (2017–2026)64
Canadian Solar CS3N-420MS420 W≥20.7%−0.33245.311.74product 202346
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.

About Maxeon Solar Technologies

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

Other series by SoCal permits

SPR-MAX6 · 2SPR-MAX6-xxx-BLKSPR-MAX3-xxx-BLKSPR-MAX3-xxx-BLK-RSPR-MAX3-xxx-COMSPR-MAX3-xxx-COM-R

Questions & answers

How efficient is the Maxeon Solar Technologies SPR-MAX3 420?

Calculated from the panel area (1.9 m²): about 22.1% for the 420 W class. 420 W over 1.9 m² equals about 221 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 = −0.272 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 14.1% 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 2–7 panels per string (Voc at 2 °C = 85.6 V, Vmp at 74 °C cell = 58.4 V). Final design must follow the inverter manual and NEC 690.7.

What does the warranty cover?

40 years on performance (manufacturer datasheet).

Has this panel been reliability-tested?

This exact series is not in published PVEL Top Performer tables; Maxeon Solar Technologies was named a Top Performer in 8 Scorecards (2017–2025).

Sources

  1. California Energy Commission — Solar Equipment Lists, PV Module List, Inverter List (snapshot Oct 7, 2026).
  2. Maxeon Solar Technologies — manufacturer datasheet “MAXEON 3 SOLAR PANEL Up to 22.7% Efficient Ideal for residential White backsheet,”.
  3. Qcells — manufacturer datasheet “Q.PEAK DUO BLK ML-G10+ ENDURING HIGH PERFORMANCE”.
  4. Canadian Solar — manufacturer datasheet “HiKu Mono PERC CS3N-400|405|410|415|420|425MS MORE POWER”.
  5. Kiwa PVEL — PV Module Reliability Scorecard, Top Performer lists 2017–2025.
  6. NLR (formerly NREL) — System Advisor Model CEC inverter library (version 2026.7.3).
  7. NLR (formerly NREL) — PVWatts v8, NSRDB PSM v3 typical-year weather for Los Angeles, Palmdale, Chula Vista, Huntington Beach, Riverside, Santa Clarita.
  8. Inverter datasheets — APsystems (Alt Power System), Enphase, Solis (Ginlong), Tesla (manufacturer documents).
  9. Building permits — Southern California permit portals. Equipment matched from permit descriptions.
  10. Cali-Graf calculations — formulas and inputs are shown next to each calculated value (efficiency from area, temperature-corrected voltages, string sizing, energy estimates).