41.2″ · 1,046 mm wide

Solar panelSunPower

SunPower SPR-X22-475-COM

Name: SunPower SPR-X22-475-COM
Brand: SunPower

128 cells. Power classes 460–485 W in the CEC list.

CEC listed · May 15, 2018UL 1703

Power class

Power (STC)475 WCEC nameplate
Efficiency≈22.0%calculated from area
%/°C Pmax−0.352CEC listing test
PTC / STC93.2%PTC 443 W (CEC)

Power classes

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation · 5 models

Model	Pmax	Voc, V	Isc, A	Vmp, V	Imp, A	Efficiency	PTC
SPR-X22-460-COM	460 W	90.50	6.40	76.70	6.00	≈21.3%	428 W
SPR-X22-470-COM	470 W	91.80	6.43	77.90	6.03	≈21.7%	438 W
SPR-X22-475-COM	475 W	92.50	6.45	78.50	6.07	≈22.0%	443 W
SPR-X22-480-COM	480 W	92.70	6.48	79.00	6.08	≈22.2%	453 W
SPR-X22-485-COM	485 W	92.70	6.55	78.80	6.16	≈22.5%	458 W

≈ efficiency = Pmax ÷ CEC-listed area 2.16 m².

Build & dimensions

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

Dimensions81.4 × 41.2 in2,067 × 1,046 mm
Module area2.16 m² (23.3 ft²)length × width
Cells128 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	−0.352 %/°C
Voc coefficient β	−0.293 %/°C
Isc coefficient α	+0.031 %/°C
Vmp coefficient	−0.372 %/°C
Operating cell temperature	NOCT 45.7 °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
460 W	339.7 W	71.07 V × 4.78 A	86.2 W	94%
470 W	346.5 W	72.19 V × 4.8 A	88.3 W	94%
475 W	351.3 W	72.74 V × 4.83 A	89.7 W	94%
480 W	357.4 W	74.31 V × 4.81 A	88.6 W	92%
485 W	361.2 W	74.12 V × 4.87 A	89.6 W	92%

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

98.7 V

Voc when cold

per panel

64.2 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	1–6
Solis (Ginlong) S6-EH1P10K-H-US	600 V	80–520 V	datasheet	2–6
Solis (Ginlong) Solis-1P7.6K-4G-US	600 V	100–500 V	datasheet	2–6
Qcells Q.VOLT H7.6SX	498 V	234–498 V	CEC test window	4–5

Microinverters (one per panel)

Microinverter	Recommended module power	Max DC input	MPPT	Voc cold / Vmp hot	Check	DC/AC
Enphase IQ8X-80-M-US	320–540 W	79.5 V	43–60 V	98.7 / 64.2 V	✗ Not allowed: cold Voc above max input	1.25
APsystems (Alt Power System) DS3-L	265–570 W	60 V	28–45 V	98.7 / 64.2 V	✗ Not allowed: cold Voc above max input	0.61
Enphase IQ8A-72-2-US	295–500 W	60 V	32–45 V	98.7 / 64.2 V	✗ Not allowed: cold Voc above max input	1.36

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	796	11,942	6.08
Palmdale	1,835	872	13,074	6.69
Chula Vista	1,696	806	12,084	6.11
Huntington Beach	1,643	780	11,706	5.89
Riverside	1,696	806	12,084	6.21
Santa Clarita	1,724	819	12,284	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 475 W panels

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

Panel	Pmax	Efficiency	γ Pmax (CEC)	Voc, V	Isc, A	Size	PVEL (product / brand)	SoCal permits (series)
SunPower SPR-X22-475-COM	475 W	≈22%	−0.352	92.5	6.45	81.4 in	—	—
REC Group REC475AA Pure-RX	475 W	≈23.5%	−0.248	65.7	9	—	brand 9× (2016–2025)	33
SEG Solar SEG-455-BTD-BG	455 W	≈23.3%	−0.262	39.76	14.11	67.8 × 44.6 in	product 2023, 2024, 2025, 2026	8
Qcells Q.PEAK DUO XL-G10.d 475	475 W	≥20.5%	−0.340	53.58	11.24	87.2 × 41.1 in	product 2023	6

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-X22-475-COM?

Calculated from the panel area (2.16 m²): about 22% for the 475 W class. 475 W over 2.16 m² equals about 220 W per square meter.

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

PVWatts v8 with typical-year weather gives about 796 kWh per year per 475 W panel in Los Angeles and about 872 kWh in Palmdale (20° roof, facing south, 14% system losses).

How much power does it lose on a hot roof?

With γ = −0.352 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 18.2% 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 1–6 panels per string (Voc at 2 °C = 98.7 V, Vmp at 74 °C cell = 64.2 V). Final design must follow the inverter manual and NEC 690.7.

Sources

California Energy Commission — Solar Equipment Lists, PV Module List, Inverter List (snapshot Oct 7, 2026).
SEG Solar — manufacturer datasheet “XXXTFHTPMBSDPN YUKON/Series )BMG$FMM/5ZQF501$PO”.
Qcells — manufacturer datasheet “Q.PEAK DUO XL-G10.d ENDURING HIGH PERFORMANCE”.
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).