Illustration · 120 half-cut cells

Solar panelZhejiang Sunpro Power Technology

Zhejiang Sunpro Power Technology SPDG475-N120M10

Name: Zhejiang Sunpro Power Technology SPDG475-N120M10
Brand: Zhejiang Sunpro Power Technology

120 half-cut cells, bifacial, glass (dual-glass module). Power classes 455–500 W in the CEC list.

CEC listed · Sep 11, 2024UL 61730Bifacial

Power class

Power (STC)475 WCEC nameplate
Efficiency≈22.5%calculated from area
%/°C Pmax−0.295CEC listing test
PTC / STC95%PTC 451 W (CEC)

Power classes

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation · 10 models

Model	Pmax	Voc, V	Isc, A	Vmp, V	Imp, A	Efficiency	PTC	CEC listed
SPDG455-N120M10	455 W	42.10	13.83	34.76	13.09	≈21.6%	432 W	Sep 11, 2024
SPDG460-N120M10	460 W	42.24	13.94	34.88	13.19	≈21.8%	437 W	Sep 11, 2024
SPDG465-N120M10	465 W	42.38	14.03	34.99	13.29	≈22.0%	442 W	Sep 11, 2024
SPDG470-N120M10	470 W	42.52	14.12	35.11	13.39	≈22.3%	446 W	Sep 11, 2024
SPDG475-N120M10	475 W	42.66	14.20	35.24	13.48	≈22.5%	451 W	Sep 11, 2024
SPDG480-N120M10	480 W	42.80	14.29	35.38	13.57	≈22.7%	456 W	Sep 11, 2024
SPDG485-N120M10	485 W	42.94	14.38	35.52	13.66	≈23.0%	461 W	Sep 11, 2024
SPDG490-N120M10	490 W	43.06	14.47	35.66	13.75	≈23.2%	466 W	Sep 11, 2024
SPDG495-N120M10	495 W	43.21	14.56	35.80	13.83	≈23.5%	471 W	May 1, 2026
SPDG500-N120M10	500 W	43.36	14.65	35.94	13.92	≈23.7%	476 W	May 1, 2026

≈ efficiency = Pmax ÷ CEC-listed area 2.11 m².

Build & dimensions

CEC PV Module List (Oct 7, 2026)

Module area2.11 m² (22.7 ft²)CEC-listed area
Cells120 half-cut 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	−0.295 %/°C
Voc coefficient β	−0.251 %/°C
Isc coefficient α	+0.043 %/°C
Operating cell temperature	NOCT 43.4 °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
455 W	332.3 W	32.46 V × 10.24 A	88.4 W	97%
460 W	336 W	32.57 V × 10.32 A	89.4 W	97%
465 W	339.6 W	32.68 V × 10.39 A	90.3 W	97%
470 W	343.4 W	32.79 V × 10.47 A	91.3 W	97%
475 W	346.9 W	32.91 V × 10.54 A	92.3 W	97%
480 W	350.6 W	33.04 V × 10.61 A	93.3 W	97%
485 W	354.4 W	33.17 V × 10.68 A	94.3 W	97%
490 W	358.1 W	33.3 V × 10.75 A	95.3 W	97%
495 W	361.6 W	33.43 V × 10.82 A	96.2 W	97%
500 W	365.4 W	33.56 V × 10.89 A	97.2 W	97%

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

Certifications

CEC PV Module List (Oct 7, 2026) · Clean Energy Council (Australia)

UL 61730IEC 61215:2021 / IEC 61730:2023

UL 61730CEC listing
IEC 61215:2021 / IEC 61730:2023TÜV SÜD Product Service GmbH, valid to Oct 2027

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

45.1 V

Voc when cold

per panel

29.4 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	3–13
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	8–11

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	45.1 / 29.4 V	✗ Not a match: module voltage below MPPT range	1.25
APsystems (Alt Power System) DS3-L	265–570 W	60 V	28–45 V	45.1 / 29.4 V	✓ Within range	0.61
Enphase IQ8A-72-2-US	295–500 W	60 V	32–45 V	45.1 / 29.4 V	⚠ Works; below MPPT at peak heat	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	PVEL (product / brand)	SoCal permits (series)
Zhejiang Sunpro Power Technology SPDG475-N120M10	475 W	≈22.5%	−0.295	42.66	14.2	—	—
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	product 2023, 2024, 2025, 2026	8
Qcells Q.PEAK DUO XL-G10.d 475	475 W	≥20.5%	−0.340	53.58	11.24	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 Zhejiang Sunpro Power Technology SPDG475-N120M10?

Calculated from the panel area (2.11 m²): about 22.5% for the 475 W class. 475 W over 2.11 m² equals about 225 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 = −0.295 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 15.3% 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 = 45.1 V, Vmp at 74 °C cell = 29.4 V). Final design must follow the inverter manual and NEC 690.7.

Does it work with APsystems (Alt Power System) DS3-L microinverters?

Voltage check against the APsystems (Alt Power System) datasheet: Voc when cold 45.1 V vs max input 60 V; Vmp when hot 29.4 V vs MPPT low 28 V; recommended module power 265–570 W. Confirm on the microinverter maker’s compatibility list.

Is it bifacial?

Yes. Rear gain depends on mounting height and ground reflectance.

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).
Clean Energy Council (Australia) — Approved PV modules list (as of Oct 8, 2026).
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).