Illustration · 72 cells

Solar panelSunPower

SunPower SPR-A425-COM

Name: SunPower SPR-A425-COM
Brand: SunPower

72 cells. Power classes 400–460 W in the CEC list.

CEC listed · Apr 2, 2019UL 1703

Power class

Power (STC)425 WCEC nameplate
Efficiency≈20.9%calculated from area
%/°C Pmax−0.329CEC listing test
PTC / STC92.8%PTC 394 W (CEC)

Power classes

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation · 11 models

Model	Pmax	Voc, V	Isc, A	Vmp, V	Imp, A	Efficiency	PTC	CEC listed
SPR-A400-COM	400 W	52.10	10.90	43.30	10.10	≈19.7%	371 W	Apr 2, 2019
SPR-A405-COM	405 W	52.70	10.90	43.40	10.10	≈20.0%	375 W	Apr 2, 2019
SPR-A410-COM	410 W	53.40	10.90	44.40	10.10	≈20.2%	380 W	Apr 2, 2019
SPR-A415-COM	415 W	54.00	10.90	44.90	10.10	≈20.4%	385 W	Apr 2, 2019
SPR-A420-COM	420 W	54.70	10.90	45.40	10.10	≈20.7%	390 W	Apr 2, 2019
SPR-A425-COM	425 W	55.30	10.90	46.00	10.10	≈20.9%	394 W	Apr 2, 2019
SPR-A430-COM	430 W	51.20	10.90	42.70	10.10	≈21.2%	399 W	Apr 2, 2019
SPR-A435-COM	435 W	51.40	10.90	43.00	10.10	≈21.4%	404 W	Apr 2, 2019
SPR-A440-COM	440 W	51.60	10.90	43.40	10.20	≈21.7%	409 W	Apr 2, 2019
SPR-A450-COM	450 W	51.90	11.00	44.00	10.20	≈22.2%	418 W	Apr 2, 2019
SPR-A460-COM	460 W	52.56	10.90	43.92	10.47	≈22.7%	428 W	Jan 21, 2020

≈ efficiency = Pmax ÷ CEC-listed area 2.03 m².

Build & dimensions

CEC PV Module List (Oct 7, 2026)

Module area2.03 m² (21.9 ft²)CEC-listed area
Cells72 cells
Back coverWhite backsheet
FrameSilver frame

Heat & cold behaviour

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

	CEC listing test
Pmax coefficient γ	−0.329 %/°C
Voc coefficient β	−0.241 %/°C
Isc coefficient α	+0.033 %/°C
Vmp coefficient	−0.320 %/°C
Operating cell temperature	NOCT 48 °C

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
400 W	307.5 W	39.81 V × 7.72 A	76.4 W	95%
405 W	308.2 W	39.9 V × 7.72 A	76.6 W	95%
410 W	315.3 W	40.82 V × 7.72 A	78.3 W	96%
415 W	318.8 W	41.28 V × 7.72 A	79.2 W	95%
420 W	322.4 W	41.74 V × 7.72 A	80.1 W	95%
425 W	326.6 W	42.29 V × 7.72 A	81.2 W	95%
430 W	303.2 W	39.26 V × 7.72 A	75.3 W	88%
435 W	305.3 W	39.53 V × 7.72 A	75.9 W	87%
440 W	311.2 W	39.9 V × 7.8 A	77.3 W	88%
450 W	315.5 W	40.45 V × 7.8 A	78.4 W	87%
460 W	323.3 W	40.38 V × 8.01 A	80.3 W	87%

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

Inverter compatibility & string sizing

CEC PV Module List (Oct 7, 2026) · NLR PVWatts v8 · inverter datasheets · NLR SAM inverter library · CEC Grid Support Inverter List (Oct 7, 2026)

CityColdest air, °CHottest cell, °CString inverter

58.4 V

Voc when cold

per panel

38.8 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. β is the CEC-measured coefficient; NEC 690.7 calculations use the datasheet value.

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	2–10
Solis (Ginlong) S6-EH1P10K-H-US	600 V	80–520 V	datasheet	3–10
Solis (Ginlong) Solis-1P7.6K-4G-US	600 V	100–500 V	datasheet	3–10
Qcells Q.VOLT H7.6SX	498 V	234–498 V	CEC test window	7–8

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	58.4 / 38.8 V	✓ Within range	1.47
Enphase IQ8X-80-M-US	320–540 W	79.5 V	43–60 V	58.4 / 38.8 V	⚠ Works; below MPPT at peak heat	1.12
APsystems (Alt Power System) DS3-L	265–570 W	60 V	28–45 V	58.4 / 38.8 V	✓ Within range	0.54
Enphase IQ8M-72-2-US	260–460 W	60 V	30–45 V	58.4 / 38.8 V	✓ Within range	1.31
Enphase IQ8A-72-2-US	295–500 W	60 V	32–45 V	58.4 / 38.8 V	✓ Within range	1.22

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	712	11,397	6.08
Palmdale	1,835	780	12,478	6.69
Chula Vista	1,696	721	11,533	6.11
Huntington Beach	1,643	698	11,172	5.89
Riverside	1,696	721	11,533	6.21
Santa Clarita	1,724	733	11,723	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.

Compare with similar 425 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)
SunPower SPR-A425-COM	425 W	≈20.9%	−0.329	55.3	10.9	—	—	—
Canadian Solar CS3N-425MS	425 W	≥20.9%	−0.332	45.5	11.8	25 yr	product 2023	46
Qcells Q.TRON BLK M-G2+ 425	425 W	≥21.8%	−0.276	39.03	13.66	25 / 25 yr	brand 11× (2016–2026)	40
Silfab Solar SIL-425QD	425 W	≈21.8%	−0.294	38.88	13.68	25 / 30 yr	brand 7× (2017–2025)	39

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.

Questions & answers

How efficient is the SunPower SPR-A425-COM?

Calculated from the panel area (2.03 m²): about 20.9% for the 425 W class. 425 W over 2.03 m² equals about 209 W per square meter.

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

PVWatts v8 with typical-year weather gives about 712 kWh per year per 425 W panel in Los Angeles and about 780 kWh in Palmdale (20° roof, facing south, 14% system losses).

How much power does it lose on a hot roof?

With γ = −0.329 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 17% 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 2–10 panels per string (Voc at 2 °C = 58.4 V, Vmp at 74 °C cell = 38.8 V). Final design must follow the inverter manual and NEC 690.7.

Does it work with Enphase IQ8PLUS-72-2-US microinverters?

Voltage check against the Enphase datasheet: Voc when cold 58.4 V vs max input 60 V; Vmp when hot 38.8 V vs MPPT low 29 V; recommended module power 235–440 W. Confirm on the microinverter maker’s compatibility list.

Sources

California Energy Commission — Solar Equipment Lists, PV Module List, Inverter List (snapshot Oct 7, 2026).
Canadian Solar — manufacturer datasheet “HiKu Mono PERC CS3N-400|405|410|415|420|425MS MORE POWER”.
Qcells — manufacturer datasheet “Q.TRON BLK M-G2+ SERIES 415–440 Wp”.
Silfab Solar — datasheet NTC SIL-420 QD CELL TECHNOLOGY.
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 — Southern California permit portals. Equipment matched from permit descriptions.
Cali-Graf calculations — formulas and inputs are shown next to each calculated value (efficiency from area, temperature-corrected voltages, string sizing, energy estimates).