Illustration · 72 cells

Solar panelCanadian Solar

Canadian Solar CS6U-325P

Name: Canadian Solar CS6U-325P
Brand: Canadian Solar

72 cells, PERC. Power classes 310–340 W in the CEC list; datasheet covers 325–335 W.

CEC listed · Sep 12, 2022UL 61730PERC

Power class

Power (STC)325 Wtolerance +5 / −0 W
Efficiency≥16.7%datasheet minimum
%/°C Pmax−0.40CEC test: −0.410
PTC / STC92.3%PTC 300 W (CEC)

Power classes

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

Model	Pmax	Voc, V	Isc, A	Vmp, V	Imp, A	Efficiency	PTC	CEC listed
CS6U-310P	310 W	44.90	9.08	36.40	8.52	≈17.8%	286 W	Sep 12, 2022
CS6U-315P	315 W	45.10	9.18	36.60	8.61	≈18.1%	291 W	Sep 12, 2022
CS6U-320P	320 W	45.30	9.26	36.80	8.69	≈18.4%	295 W	Sep 12, 2022
CS6U-325P	325 W	45.50	9.34	37.00	8.78	≥16.7%	300 W	Sep 12, 2022
CS6U-330P	330 W	45.60	9.45	37.20	8.88	≥17.0%	305 W	Sep 12, 2022
CS6U-335P	335 W	45.80	9.54	37.40	8.96	≥17.2%	310 W	Sep 12, 2022
CS6U-340P	340 W	45.90	9.62	37.60	9.05	≈19.5%	314 W	Sep 12, 2022

≈ efficiency = Pmax ÷ CEC-listed area 1.74 m² for classes outside the datasheet.

Build & dimensions

CEC PV Module List (Oct 7, 2026) · Canadian Solar datasheets

Module area1.74 m² (18.7 ft²)CEC-listed area
Cells72 cellsPERC
Back coverWhite backsheet
Junction boxIP68, 3 bypass diodes
Cable / connector4.0 mm2 (IEC), 12 AWG (UL)

Heat & cold behaviour

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

	Datasheet	CEC listing test
Pmax coefficient γ	−0.40 %/°C	−0.410 %/°C
Voc coefficient β	−0.31 %/°C	−0.312 %/°C
Isc coefficient α	+0.05 %/°C	+0.036 %/°C
Vmp coefficient	≈ −0.45 %/°C	—
Operating cell temperature	NMOT 43 ± 3 °C	NOCT 43.9 °C

Vmp coefficient ≈ γ − α (datasheet); used only for the hot-roof voltage estimate.

At normal operating conditions (NMOT, 800 W/m²) — datasheet

Class	Pmax, W	Voc, V	Isc, A	Vmp, V	Imp, A
325 W	239.0	42.40	7.54	34.00	7.03
330 W	243.0	42.50	7.63	34.20	7.10
335 W	247.0	42.60	7.70	34.40	7.17

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
310 W	227.5 W	34.19 V × 6.65 A	59.9 W	97%
315 W	231.1 W	34.38 V × 6.72 A	60.9 W	97%
320 W	234.5 W	34.57 V × 6.79 A	61.8 W	97%
325 W	238.3 W	34.75 V × 6.86 A	62.8 W	97%
330 W	242.3 W	34.94 V × 6.93 A	63.9 W	97%
335 W	245.8 W	35.13 V × 7 A	64.8 W	97%
340 W	249.6 W	35.32 V × 7.07 A	65.8 W	97%

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

Electrical & strength ratings

Max system voltage1,500 V
Max series fuse15 A
Fire rating (UL 61730)Type 1
Module temperature−40 °F to +185 °F−40 °C to +85 °C
Power tolerance+5 / −0 W

Certifications

CEC PV Module List (Oct 7, 2026) · Canadian Solar datasheet

UL 61730UL 1703IEC 61215IEC 61730IEC 61701IEC 62716IEC 60068MCSFire rating Type 1 (UL 61730)ISO 14001ISO 45001ISO 9001

UL 61730CEC listing
UL 1703datasheet
IEC 61215datasheet
IEC 61730datasheet
IEC 61701datasheet
IEC 62716datasheet
IEC 60068datasheet
MCSdatasheet
Fire rating Type 1 (UL 61730)datasheet
ISO 14001factory, datasheet
ISO 45001factory, datasheet
ISO 9001factory, datasheet

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

Canadian Solar datasheet · Cali-Graf calculation · NLR PVWatts v8 · CEC PV Module List (Oct 7, 2026) · inverter datasheets · NLR SAM inverter library · CEC Grid Support Inverter List (Oct 7, 2026)

CityColdest air, °CHottest cell, °CString inverter

48.7 V

Voc when cold

per panel

28.8 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.

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 IQ8PLUS-72-2-US	235–440 W	60 V	29–45 V	48.7 / 28.8 V	⚠ Works; below MPPT at peak heat	1.12
Enphase IQ8X-80-M-US	320–540 W	79.5 V	43–60 V	48.7 / 28.8 V	✗ Not a match: module voltage below MPPT range	0.86
APsystems (Alt Power System) DS3-L	265–570 W	60 V	28–45 V	48.7 / 28.8 V	✓ Within range	0.42
Enphase IQ8M-72-2-US	260–460 W	60 V	30–45 V	48.7 / 28.8 V	⚠ Works; below MPPT at peak heat	1
Enphase IQ8A-72-2-US	295–500 W	60 V	32–45 V	48.7 / 28.8 V	⚠ Works; below MPPT at peak heat	0.93

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	545	11,983	6.08
Palmdale	1,835	596	13,120	6.69
Chula Vista	1,696	551	12,126	6.11
Huntington Beach	1,643	534	11,747	5.89
Riverside	1,696	551	12,126	6.21
Santa Clarita	1,724	560	12,327	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 325 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	Warranty	PVEL (product / brand)	SoCal permits (series)
Canadian Solar CS6U-325P	325 W	≥16.7%	−0.410	45.5	9.34	—	—	brand 5×	—
JinkoSolar JKM325M-60HBL	325 W	≈19.3%	−0.407	41.1	10.2	66.3 × 39.4 in	10 / 25 yr	brand 12× (2014–2026)	45
Qcells Q.PEAK DUO-G8+ 330	330 W	≈18.4%	−0.343	39.71	10.52	68.5 × 40.6 in	25 / 25 yr	product 2022	20
LG Electronics LG325N1C-N5	325 W	≈18.8%	−0.342	40.9	10.57	66.9 × 40 in	25 / 25 yr	product 2021	5

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 CS6U-325P?

The Canadian Solar datasheet guarantees at least 16.7% module efficiency for the 325 W class (up to 17.2% for 335 W). 325 W over 1.74 m² equals about 187 W per square meter.

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

PVWatts v8 with typical-year weather gives about 545 kWh per year per 325 W panel in Los Angeles and about 596 kWh in Palmdale (20° roof, facing south, 14% system losses).

How much power does it lose on a hot roof?

With γ = −0.40 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 20.7% 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 = 48.7 V, Vmp at 74 °C cell = 28.8 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 48.7 V vs max input 60 V; Vmp when hot 28.8 V vs MPPT low 28 V; recommended module power 265–570 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).

What fire rating does it have?

UL 61730 fire rating Type 1 per datasheet.

Sources

California Energy Commission — Solar Equipment Lists, PV Module List, Inverter List (snapshot Oct 7, 2026).
Canadian Solar — manufacturer datasheet “MAXPOWER CS6U- 340| 345| 350P HIGH EFFICIENCY POLY MODULE”.
Canadian Solar — manufacturer datasheet “MAXPOWER CS6U- 325| 330| 335P Canadian Solar‘s modules use the latest innovative”.
JinkoSolar — datasheet THE MOST DEPENDABLE SOLAR BRAND.
JinkoSolar — manufacturer datasheet “Eagle HC 60M G2 315-335 Watt MONO PERC HALF CELL MODULE”.
Qcells — manufacturer datasheet “Q.PEAK DUO-G8+ 345-360 EN ENDURING HIGH”.
LG Electronics — datasheet Specification Sheet.
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).