41.3″ · 1,048 mm wide · 1.38″ (35 mm) frame · 53.8 lb (24.4 kg)

Solar panelVSUN (Vietnam Sunergy)

VSUN (Vietnam Sunergy) VSUN435-144M

Name: VSUN (Vietnam Sunergy) VSUN435-144M
Brand: VSUN (Vietnam Sunergy)

144 half-cut cells (12 × 12), PERC. Power classes 375–545 W in the CEC list; datasheet covers 435–450 W.

CEC listed · Jul 1, 2020UL 61730PERC

Power class

Power (STC)435 WCEC nameplate
Efficiency≥19.7%datasheet minimum
%/°C Pmax−0.333CEC listing test
Performance warranty25 yrdatasheet

Power classes

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation · VSUN (Vietnam Sunergy) datasheet · 18 models

Model	Pmax	Voc, V	Isc, A	Vmp, V	Imp, A	Efficiency	PTC	CEC listed
VSUN375-144M	375 W	47.80	10.00	39.60	9.47	≈17.0%	347 W	Jul 1, 2020
VSUN380-144M	380 W	48.10	10.06	39.90	9.53	≈17.2%	351 W	Jul 1, 2020
VSUN385-144M	385 W	48.40	10.12	40.20	9.59	≈17.4%	356 W	Jul 1, 2020
VSUN390-144M	390 W	48.50	10.22	40.30	9.68	≈17.7%	361 W	Jul 1, 2020
VSUN395-144M	395 W	48.70	10.31	40.50	9.76	≈17.9%	366 W	Jul 1, 2020
VSUN420-144M	420 W	49.80	10.73	41.50	10.13	≈19.0%	392 W	Apr 1, 2021
VSUN425-144M	425 W	49.00	11.11	40.40	10.52	≈19.2%	396 W	Apr 1, 2021
VSUN430-144M	430 W	49.20	11.19	40.60	10.60	≈19.5%	401 W	Apr 1, 2021
VSUN435-144M	435 W	49.40	11.26	40.80	10.67	≥19.7%	406 W	Apr 1, 2021
VSUN440-144M	440 W	49.60	11.34	41.00	10.74	≥19.9%	411 W	Apr 1, 2021
VSUN445-144M	445 W	49.80	11.42	41.20	10.81	≥20.1%	416 W	Apr 1, 2021
VSUN515-144M	515 W	49.00	13.45	41.02	12.56	≈23.3%	475 W	Jan 3, 2022
VSUN520-144M	520 W	49.11	13.53	41.11	12.65	≈23.5%	480 W	Jan 3, 2022
VSUN525-144M	525 W	49.22	13.63	41.22	12.74	≈23.8%	484 W	Jan 3, 2022
VSUN530-144M	530 W	49.35	13.71	41.35	12.82	≈24.0%	489 W	Jan 3, 2022
VSUN535-144M	535 W	49.50	13.78	41.50	12.90	≈24.2%	494 W	Jan 3, 2022
VSUN540-144M	540 W	49.65	13.85	41.65	12.97	≈24.4%	499 W	Jan 3, 2022
VSUN545-144M	545 W	49.81	13.92	41.80	13.04	≈24.7%	503 W	Jan 3, 2022

≈ efficiency = Pmax ÷ panel area 2.209 m² (datasheet size) for classes outside the datasheet.

Build & dimensions

VSUN (Vietnam Sunergy) datasheet · Cali-Graf calculation

Dimensions83 × 41.3 × 1.38 in2,108 × 1,048 × 35 mm
Module area2.21 m² (23.8 ft²)length × width
Weight53.8 lb (24.4 kg)
Cells144 half-cut cells (12 × 12)PERC
Front glassWhite toughened safety glass, 3.2 mm
Back coverComposite film
FrameSilver anodized aluminum profile
Junction boxIP≧67, 3 diodes
Cable / connectorPotrait: 300 mm (cable length can be customized) , 1x4 mm2,

Heat & cold behaviour

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation · VSUN (Vietnam Sunergy) datasheet

	Datasheet	CEC listing test
Pmax coefficient γ	—	−0.333 %/°C
Voc coefficient β	—	−0.268 %/°C
Isc coefficient α	—	+0.053 %/°C
Vmp coefficient	≈ −0.39 %/°C	—
Operating cell temperature	NMOT 45 °C	NOCT 45.7 °C

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

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

Class	Pmax, W	Voc, V	Isc, A	Vmp, V	Imp, A
435 W	324.3	46.00	9.09	37.90	8.55
440 W	328.0	46.20	9.16	38.10	8.61
445 W	331.7	46.40	9.22	38.20	8.67

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
375 W	281 W	37.56 V × 7.48 A	71.8 W	96%
380 W	284.9 W	37.84 V × 7.53 A	72.8 W	96%
385 W	288.9 W	38.12 V × 7.58 A	73.8 W	96%
390 W	292.3 W	38.22 V × 7.65 A	74.7 W	96%
395 W	296.2 W	38.41 V × 7.71 A	75.7 W	96%
420 W	314.4 W	39.46 V × 7.97 A	83.3 W	99%
425 W	317.8 W	38.41 V × 8.28 A	84.2 W	99%
430 W	321.8 W	38.6 V × 8.34 A	85.3 W	99%
435 W	325.6 W	38.79 V × 8.39 A	86.2 W	99%
440 W	329.3 W	38.98 V × 8.45 A	87.2 W	99%
445 W	333.1 W	39.17 V × 8.5 A	88.2 W	99%
515 W	386.6 W	38.39 V × 10.07 A	104.4 W	101%
520 W	390.2 W	38.48 V × 10.14 A	105.4 W	101%
525 W	394.1 W	38.58 V × 10.21 A	106.4 W	101%
530 W	397.8 W	38.7 V × 10.28 A	107.4 W	101%
535 W	401.7 W	38.84 V × 10.34 A	108.5 W	101%
540 W	405.4 W	38.98 V × 10.4 A	109.4 W	101%
545 W	409 W	39.12 V × 10.45 A	110.4 W	101%

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

Electrical & strength ratings

Max system voltage1,000 V
Max series fuse20 A
Protection classclass A
Design load push / pull113 psf5,400 Pa
Module temperature−40 °F to +185 °F−40 °C to +85 °C
Hail25 mm (0.98 in)

Warranty & degradation

VSUN (Vietnam Sunergy) datasheet

Performance warranty25 years, linear

Independent reliability testing

Kiwa PVEL Scorecard · RETC PV Module Index

2022

PVEL Top Performer

closely related product name

Tests passed as Top Performer

LID+LETID, TC

PVEL Scorecards

VSUN (Vietnam Sunergy) named Top Performer, 2021–2026

2025, 2026

RETC Overall Highest Achiever

VSUN (Vietnam Sunergy), manufacturer level

PVEL Top Performer tests

Year	Product	Tests
2022	VSUNxxx-144MH (closely related product name)	LID+LETIDTC

Tested bill of materials

Cell technology (tested BOM)p-type PERC
Module design (tested BOM)Monofacial - glass//backsheet
Power class range tested405-450W

Details describe the tested sample, not every module of the series.

RETC PV Module Index — VSUN (Vietnam Sunergy)

Year	Recognition
2024	Test Category High Achiever
2025	Overall Highest Achiever
2026	Overall Highest Achiever; High achievement in performance; High achievement in reliability; Performance discipline high achiever (Lid, PAN file, Temperature coefficient, Iam, Letid); Quality discipline high achiever (BOM verification); Reliability discipline high achiever (Damp heat, Pid, Sdml, Tc, Uvid)

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

52.4 V

Voc when cold

per panel

33.1 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	52.4 / 33.1 V	✓ Within range	1.5
Enphase IQ8X-80-M-US	320–540 W	79.5 V	43–60 V	52.4 / 33.1 V	✗ Not a match: module voltage below MPPT range	1.14
APsystems (Alt Power System) DS3-L	265–570 W	60 V	28–45 V	52.4 / 33.1 V	✓ Within range	0.56
Enphase IQ8M-72-2-US	260–460 W	60 V	30–45 V	52.4 / 33.1 V	✓ Within range	1.34
Enphase IQ8A-72-2-US	295–500 W	60 V	32–45 V	52.4 / 33.1 V	✓ Within range	1.25

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	729	11,665	6.08
Palmdale	1,835	798	12,772	6.69
Chula Vista	1,696	738	11,804	6.11
Huntington Beach	1,643	715	11,435	5.89
Riverside	1,696	738	11,804	6.21
Santa Clarita	1,724	750	11,999	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 435 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)
VSUN (Vietnam Sunergy) VSUN435-144M	435 W	≥19.7%	−0.333	49.4	11.26	83 × 41.3 in	—	brand 6×	—
Canadian Solar CS3N-430MS	430 W	≈21.8%	−0.332	45.7	11.86	—	25 yr	product 2023	46
Qcells Q.TRON BLK M-G2+ 435	435 W	≥22.3%	−0.276	39.6	13.82	67.8 × 44.6 in	25 / 25 yr	brand 11× (2016–2026)	40
Silfab Solar SIL-435QD	435 W	≈22.3%	−0.294	38.94	14.05	67.8 × 44.6 in	25 / 30 yr	brand 7× (2017–2025)	39

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 VSUN (Vietnam Sunergy)

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

ManufacturerVSUN (Vietnam Sunergy)
Listed in CEC asVietnam Sunergy Joint Stock Company
Websitevsun-solar.com
PVEL Top Performer (manufacturer)6 Scorecards (2021–2026)
RETC PV Module Index2024, 2025, 2026
Current panel series in CEC list82

Other series by SoCal permits

VSUNxxxN-108BMH-BB · 4VSUNxxxN-108MH-BB · 3VSUNxxxN-144MH · 1VSUNxxx-108BMH · 1VSUNxxx-108M-BB · 1VSUNxxxN-108BMH

Questions & answers

How efficient is the VSUN (Vietnam Sunergy) VSUN435-144M?

The VSUN (Vietnam Sunergy) datasheet guarantees at least 19.7% module efficiency for the 435 W class (up to 20.1% for 445 W). 435 W over 2.21 m² equals about 197 W per square meter.

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

PVWatts v8 with typical-year weather gives about 729 kWh per year per 435 W panel in Los Angeles and about 798 kWh in Palmdale (20° roof, facing south, 14% system losses).

How much power does it lose on a hot roof?

With γ = −0.333 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 17.2% 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 = 52.4 V, Vmp at 74 °C cell = 33.1 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 52.4 V vs max input 60 V; Vmp when hot 33.1 V vs MPPT low 29 V; recommended module power 235–440 W. Confirm on the microinverter maker’s compatibility list.

What does the warranty cover?

25 years linear on performance (manufacturer datasheet).

How big and heavy is it?

83 × 41.3 × 1.38 in (2,108 × 1,048 × 35 mm), 53.8 lb (24.4 kg).

Has this panel been reliability-tested?

VSUNxxx-144MH was a PVEL Top Performer in 2022 (LID+LETID, TC) — a closely related product name.

Sources

California Energy Commission — Solar Equipment Lists, PV Module List, Inverter List (snapshot Oct 7, 2026).
VSUN (Vietnam Sunergy) — manufacturer datasheet “VSUN450-144M VSUN320-60M Highest power output”.
Canadian Solar — manufacturer datasheet “HiKu Mono PERC CS3N-400|405|410|415|420|425MS MORE POWER”.
Qcells — manufacturer datasheet “Q.TRON BLK M-G2+ SERIES 415–440 Wp”.
Silfab Solar — datasheet NTC SIL-420 QD CELL TECHNOLOGY.
Kiwa PVEL — PV Module Reliability Scorecard, Top Performer lists 2021–2026.
RETC — PV Module Index reports 2024–2026.
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).