Illustration · 345 cells

Solar panelMaxeon Solar Technologies

Maxeon Solar Technologies SPR-P5-520-UPP

Name: Maxeon Solar Technologies SPR-P5-520-UPP
Brand: Maxeon Solar Technologies

345 cells. Power classes 495–550 W in the CEC list.

CEC listed · Mar 1, 2022UL 61730

Power class

Power (STC)520 WCEC nameplate
Efficiency≈20.0%calculated from area
%/°C Pmax−0.493CEC listing test
PTC / STC89.8%PTC 467 W (CEC)

Power classes

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation · 12 models

Model	Pmax	Voc, V	Isc, A	Vmp, V	Imp, A	Efficiency	PTC	CEC listed
SPR-P5-495-UPP	495 W	46.00	14.55	36.90	13.42	≈19.0%	445 W	Apr 1, 2022
SPR-P5-500-UPP	500 W	46.10	14.62	37.10	13.48	≈19.2%	449 W	Apr 1, 2022
SPR-P5-505-UPP	505 W	46.10	14.68	37.30	13.55	≈19.4%	454 W	Apr 1, 2022
SPR-P5-510-UPP	510 W	46.10	14.74	37.40	13.64	≈19.6%	458 W	Mar 1, 2022
SPR-P5-515-UPP	515 W	46.30	14.75	37.70	13.66	≈19.8%	462 W	Mar 1, 2022
SPR-P5-520-UPP	520 W	46.60	14.76	38.00	13.69	≈20.0%	467 W	Mar 1, 2022
SPR-P5-525-UPP	525 W	46.80	14.77	38.30	13.71	≈20.2%	473 W	Mar 1, 2022
SPR-P5-530-UPP	530 W	47.10	14.78	38.60	13.73	≈20.4%	476 W	Mar 1, 2022
SPR-P5-535-UPP	535 W	47.40	14.79	38.90	13.76	≈20.6%	481 W	Mar 1, 2022
SPR-P5-540-UPP	540 W	47.60	14.80	39.20	13.78	≈20.8%	486 W	Mar 1, 2022
SPR-P5-545-UPP	545 W	47.80	14.83	39.50	13.81	≈21.0%	490 W	Mar 1, 2022
SPR-P5-550-UPP	550 W	48.00	14.86	39.80	13.84	≈21.2%	495 W	Mar 1, 2022

≈ efficiency = Pmax ÷ CEC-listed area 2.6 m².

Build & dimensions

CEC PV Module List (Oct 7, 2026)

Module area2.6 m² (28 ft²)CEC-listed area
Cells345 cells
Back coverGlass (dual-glass module)

Heat & cold behaviour

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

	CEC listing test
Pmax coefficient γ	−0.493 %/°C
Voc coefficient β	−0.299 %/°C
Isc coefficient α	+0.046 %/°C
Operating cell temperature	NOCT 46.4 °C

Vmp coefficient ≈ γ − α (CEC); 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
495 W	367 W	34.19 V × 10.73 A	96.6 W	98%
500 W	370.6 W	34.38 V × 10.78 A	97.5 W	98%
505 W	374.6 W	34.56 V × 10.84 A	98.5 W	98%
510 W	367.5 W	33.9 V × 10.84 A	97.1 W	95%
515 W	371 W	34.17 V × 10.86 A	98 W	95%
520 W	374.7 W	34.44 V × 10.88 A	99 W	95%
525 W	389.2 W	35.49 V × 10.96 A	102.4 W	98%
530 W	381.8 W	34.98 V × 10.91 A	100.8 W	95%
535 W	385.6 W	35.26 V × 10.94 A	101.8 W	95%
540 W	389.1 W	35.53 V × 10.95 A	102.8 W	95%
545 W	392.9 W	35.8 V × 10.98 A	103.8 W	95%
550 W	396.8 W	36.07 V × 11 A	104.8 W	95%

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

Independent reliability testing

Kiwa PVEL Scorecard

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)

CityColdest air, °CHottest cell, °CString inverter

49.8 V

Voc when cold

per panel

28 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	3–12
Solis (Ginlong) S6-EH1P10K-H-US	600 V	80–520 V	datasheet	3–12
Solis (Ginlong) Solis-1P7.6K-4G-US	600 V	100–500 V	datasheet	4–12
Qcells Q.VOLT H7.6SX	498 V	234–498 V	CEC test window	9–10

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	49.8 / 28 V	✗ Not a match: module voltage below MPPT range	1.37
APsystems (Alt Power System) DS3-L	265–570 W	60 V	28–45 V	49.8 / 28 V	⚠ Works; below MPPT at peak heat	0.67

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	872	11,330	6.08
Palmdale	1,835	954	12,405	6.69
Chula Vista	1,696	882	11,465	6.11
Huntington Beach	1,643	854	11,107	5.89
Riverside	1,696	882	11,465	6.21
Santa Clarita	1,724	896	11,654	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 520 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	Size	PVEL (product / brand)	SoCal permits (series)
Maxeon Solar Technologies SPR-P5-520-UPP	520 W	≈20%	−0.493	46.6	14.76	—	brand 8×	—
SEG Solar SEG-520-BTD-BG	520 W	≈26.6%	−0.290	40.9	16.13	67.8 × 44.6 in	product 2023, 2024, 2025, 2026	8
Canadian Solar CS6W-520MB-AG	520 W	≈20.2%	−0.324	48.4	13.7	89.2 × 44.6 in	product 2024	1
LONGi LR5-72HBD-520M	520 W	≈20.3%	−0.323	48.9	13.57	88.8 × 44.6 in	product 2026	1

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

ManufacturerMaxeon Solar Technologies
Listed in CEC asMaxeon Solar Technologies Ltd.
Websitemaxeon.com
PVEL Top Performer (manufacturer)8 Scorecards (2017–2025)
Current panel series in CEC list13

Other series by SoCal permits

SPR-MAX6 · 2SPR-MAX6-xxx-BLKSPR-MAX3SPR-MAX3-xxx-BLKSPR-MAX3-xxx-BLK-RSPR-MAX3-xxx-COM

Questions & answers

How efficient is the Maxeon Solar Technologies SPR-P5-520-UPP?

Calculated from the panel area (2.6 m²): about 20% for the 520 W class. 520 W over 2.6 m² equals about 200 W per square meter.

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

PVWatts v8 with typical-year weather gives about 872 kWh per year per 520 W panel in Los Angeles and about 954 kWh in Palmdale (20° roof, facing south, 14% system losses).

How much power does it lose on a hot roof?

With γ = −0.493 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 25.5% 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 3–12 panels per string (Voc at 2 °C = 49.8 V, Vmp at 74 °C cell = 28 V). Final design must follow the inverter manual and NEC 690.7.

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

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”.
Canadian Solar — datasheet BiHiKu6 BIFACIAL MONO PERC CS6W-520|525|530|535|540|545|550MB-AG.
LONGi — manufacturer datasheet “LR5-72HBD Suitable for distributed projects Advanced module technology delivers superior”.
Kiwa PVEL — PV Module Reliability Scorecard, Top Performer lists 2017–2025.
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).