Illustration · 144 half-cut cells

Solar panelCanadian Solar

Canadian Solar CS3W-415P

Name: Canadian Solar CS3W-415P
Brand: Canadian Solar

144 half-cut cells. Power classes 380–450 W in the CEC list.

CEC listed · Jan 2, 2019UL 61730

Power class

Power (STC)415 WCEC nameplate
Efficiency≈19.4%calculated from area
%/°C Pmax−0.352CEC listing test
PTC / STC93.2%PTC 387 W (CEC)

Power classes

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation · 15 models

Model	Pmax	Voc, V	Isc, A	Vmp, V	Imp, A	Efficiency	PTC	CEC listed
CS3W-380P	380 W	46.40	10.58	37.90	10.03	≈17.8%	351 W	Jan 2, 2019
CS3W-385P	385 W	46.60	10.66	38.10	10.11	≈18.0%	356 W	Jan 2, 2019
CS3W-390P	390 W	46.80	10.74	38.30	10.19	≈18.2%	360 W	Jan 2, 2019
CS3W-395P	395 W	47.00	10.82	38.50	10.26	≈18.5%	365 W	Jan 2, 2019
CS3W-400P	400 W	47.20	10.90	38.70	10.34	≈18.7%	370 W	Jan 2, 2019
CS3W-405P	405 W	47.40	10.98	38.90	10.42	≈18.9%	375 W	Jan 2, 2019
CS3W-410P	410 W	47.60	11.06	39.10	10.49	≈19.2%	382 W	Nov 1, 2019
CS3W-415P	415 W	47.80	11.14	39.30	10.56	≈19.4%	387 W	Nov 1, 2019
CS3W-420P	420 W	48.00	11.26	39.50	10.64	≈19.6%	392 W	Nov 1, 2019
CS3W-425P	425 W	48.20	11.29	39.70	10.71	≈19.9%	396 W	Nov 1, 2019
CS3W-430P	430 W	48.40	11.32	39.90	10.78	≈20.1%	401 W	Nov 1, 2019
CS3W-435P	435 W	48.60	11.35	40.10	10.85	≈20.3%	402 W	Nov 1, 2019
CS3W-440P	440 W	48.70	11.40	40.30	10.92	≈20.6%	407 W	Sep 11, 2020
CS3W-445P	445 W	48.80	11.45	40.50	10.99	≈20.8%	412 W	Sep 11, 2020
CS3W-450P	450 W	49.00	11.53	40.70	11.06	≈21.0%	416 W	Sep 11, 2020

≈ efficiency = Pmax ÷ CEC-listed area 2.14 m².

CEC note: Formerly listed under Canadian Solar Inc.

Build & dimensions

CEC PV Module List (Oct 7, 2026)

Module area2.14 m² (23 ft²)CEC-listed area
Cells144 half-cut cells
Back coverWhite backsheet

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	−0.269 %/°C
Isc coefficient α	+0.047 %/°C
Operating cell temperature	NOCT 44.7 °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
380 W	283.2 W	35.3 V × 8.02 A	72.9 W	96%
385 W	286.9 W	35.48 V × 8.09 A	73.8 W	96%
390 W	290.7 W	35.67 V × 8.15 A	74.8 W	96%
395 W	294.3 W	35.85 V × 8.21 A	75.7 W	96%
400 W	298.1 W	36.04 V × 8.27 A	76.7 W	96%
405 W	301.9 W	36.23 V × 8.33 A	77.7 W	96%
410 W	304.9 W	36.61 V × 8.33 A	78.4 W	96%
415 W	308.5 W	36.8 V × 8.38 A	79.3 W	96%
420 W	312.4 W	36.99 V × 8.45 A	80.3 W	96%
425 W	316 W	37.17 V × 8.5 A	81.3 W	96%
430 W	319.7 W	37.36 V × 8.56 A	82.2 W	96%
435 W	322.3 W	36.51 V × 8.83 A	83.9 W	96%
440 W	326 W	36.69 V × 8.89 A	84.8 W	96%
445 W	329.8 W	36.87 V × 8.94 A	85.8 W	96%
450 W	333.5 W	37.06 V × 9 A	86.8 W	96%

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 · RETC PV Module Index

PVEL Scorecards

Canadian Solar named Top Performer, 2020–2026

RETC PV Module Index

Canadian Solar, 2025

This exact series is not listed in published PVEL Top Performer tables. Results below are for the manufacturer.

RETC PV Module Index — Canadian Solar

Year	Recognition
2025	Reliability High Achiever

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

50.8 V

Voc when cold

per panel

31.6 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	2–11
Solis (Ginlong) S6-EH1P10K-H-US	600 V	80–520 V	datasheet	3–11
Solis (Ginlong) Solis-1P7.6K-4G-US	600 V	100–500 V	datasheet	4–11
Qcells Q.VOLT H7.6SX	498 V	234–498 V	CEC test window	8–9

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	50.8 / 31.6 V	✓ Within range	1.43
Enphase IQ8X-80-M-US	320–540 W	79.5 V	43–60 V	50.8 / 31.6 V	✗ Not a match: module voltage below MPPT range	1.09
APsystems (Alt Power System) DS3-L	265–570 W	60 V	28–45 V	50.8 / 31.6 V	✓ Within range	0.53
Enphase IQ8M-72-2-US	260–460 W	60 V	30–45 V	50.8 / 31.6 V	✓ Within range	1.28
Enphase IQ8A-72-2-US	295–500 W	60 V	32–45 V	50.8 / 31.6 V	⚠ Works; below MPPT at peak heat	1.19

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	696	11,824	6.08
Palmdale	1,835	762	12,946	6.69
Chula Vista	1,696	704	11,965	6.11
Huntington Beach	1,643	682	11,591	5.89
Riverside	1,696	704	11,965	6.21
Santa Clarita	1,724	715	12,163	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 415 W panels

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

Panel	Pmax	Efficiency	γ Pmax (CEC)	Voc, V	Isc, A	PVEL (product / brand)	SoCal permits (series)
Canadian Solar CS3W-415P	415 W	≈19.4%	−0.352	47.8	11.14	brand 5×	—
Qcells Q.PEAK DUO BLK ML-G10+ 415	415 W	≈21.1%	−0.337	45.41	11.23	product 2022, 2023	221
REC Group REC410AA Pure	410 W	≈22.9%	−0.256	49	10.35	brand 9× (2016–2025)	66
LONGi LR5-54HABB-415M	415 W	≈21.8%	−0.342	37.77	13.94	brand 9× (2017–2026)	64

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 Canadian Solar

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

ManufacturerCanadian Solar
Listed in CEC asCSI Energy Storage Co., Ltd., CSI Solar Co., Ltd., Canadian Solar
Websitecanadiansolar.com
PVEL Top Performer (manufacturer)5 Scorecards (2020–2026)
RETC PV Module Index2025
Current panel series in CEC list38

Other series by SoCal permits

CS6R-xxxMS-HL · 46CS3N-xxxMS · 46CS6.1-54TM-xxxH · 9CS1Y-xxxMS · 6CS3W-xxxMS · 6CS3W-xxxMB-AG · 5

Questions & answers

How efficient is the Canadian Solar CS3W-415P?

Calculated from the panel area (2.14 m²): about 19.4% for the 415 W class. 415 W over 2.14 m² equals about 194 W per square meter.

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

PVWatts v8 with typical-year weather gives about 696 kWh per year per 415 W panel in Los Angeles and about 762 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 2–11 panels per string (Voc at 2 °C = 50.8 V, Vmp at 74 °C cell = 31.6 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 50.8 V vs max input 60 V; Vmp when hot 31.6 V vs MPPT low 29 V; recommended module power 235–440 W. Confirm on the microinverter maker’s compatibility list.

Has this panel been reliability-tested?

This exact series is not in published PVEL Top Performer tables; Canadian Solar was named a Top Performer in 5 Scorecards (2020–2026).

Sources

California Energy Commission — Solar Equipment Lists, PV Module List, Inverter List (snapshot Oct 7, 2026).
Qcells — manufacturer datasheet “Q.PEAK DUO BLK ML-G10+ ENDURING HIGH PERFORMANCE”.
Kiwa PVEL — PV Module Reliability Scorecard, Top Performer lists 2020–2026.
RETC — PV Module Index report.
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).