Illustration · 120 half-cut cells

Solar panelVSUN (Vietnam Sunergy)

VSUN (Vietnam Sunergy) VSUN375-120MH-BW

Name: VSUN (Vietnam Sunergy) VSUN375-120MH-BW
Brand: VSUN (Vietnam Sunergy)

120 half-cut cells. Power classes 320–470 W in the CEC list.

CEC listed · Apr 13, 2020UL 61730

Power class

Power (STC)375 WCEC nameplate
Efficiency≈20.5%calculated from area
%/°C Pmax−0.363CEC listing test
PTC / STC92.8%PTC 348 W (CEC)

Power classes

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation · 19 models

Model	Pmax	Voc, V	Isc, A	Vmp, V	Imp, A	Efficiency	PTC	CEC listed
VSUN320-120MH-BW	320 W	40.20	10.17	33.30	9.61	≈19.0%	297 W	Apr 13, 2020
VSUN325-120MH-BW	325 W	40.40	10.28	33.50	9.71	≈19.3%	302 W	Apr 13, 2020
VSUN330-120MH-BW	330 W	40.60	10.35	33.70	9.80	≈19.6%	307 W	Apr 13, 2020
VSUN335-120MH-BW	335 W	40.80	10.42	33.90	9.89	≈19.9%	311 W	Apr 13, 2020
VSUN340-120MH-BW	340 W	41.00	10.52	34.10	9.98	≈20.2%	316 W	Apr 13, 2020
VSUN345-120MH-BW	345 W	41.20	10.69	34.30	10.06	≈20.5%	321 W	Apr 13, 2020
VSUN360-120MH-BW	360 W	40.50	11.35	34.00	10.59	≈19.7%	334 W	Apr 1, 2021
VSUN365-120MH-BW	365 W	40.70	11.43	34.20	10.68	≈19.9%	338 W	Apr 1, 2021
VSUN370-120MH-BW	370 W	40.90	11.52	34.40	10.76	≈20.2%	343 W	Apr 1, 2021
VSUN375-120MH-BW	375 W	41.10	11.60	34.60	10.84	≈20.5%	348 W	Apr 1, 2021
VSUN380-120MH-BW	380 W	41.30	11.69	34.80	10.92	≈20.8%	353 W	Apr 1, 2021
VSUN435-120MH-BW	435 W	41.52	13.33	34.45	12.63	≈20.1%	407 W	Jul 3, 2023
VSUN440-120MH-BW	440 W	41.70	13.41	34.60	12.72	≈20.4%	412 W	Jul 3, 2023
VSUN445-120MH-BW	445 W	41.90	13.48	34.80	12.79	≈20.6%	416 W	Jul 3, 2023
VSUN450-120MH-BW	450 W	42.10	13.56	35.00	12.86	≈20.8%	421 W	Jul 3, 2023
VSUN455-120MH-BW	455 W	42.30	13.63	35.20	12.93	≈21.1%	426 W	Jul 3, 2023
VSUN460-120MH-BW	460 W	42.50	13.71	35.40	13.00	≈21.3%	431 W	Jul 3, 2023
VSUN465-120MH-BW	465 W	42.65	13.79	35.56	13.08	≈21.5%	436 W	Jul 3, 2023
VSUN470-120MH-BW	470 W	42.81	13.86	35.69	13.17	≈21.8%	441 W	Jul 3, 2023

≈ efficiency = Pmax ÷ CEC-listed area 1.68 m².

Build & dimensions

CEC PV Module List (Oct 7, 2026)

Module area1.83 m² (19.7 ft²)CEC-listed area
Cells120 half-cut cells
Back coverWhite backsheet
FrameBlack frame

Heat & cold behaviour

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

	CEC listing test
Pmax coefficient γ	−0.363 %/°C
Voc coefficient β	−0.281 %/°C
Isc coefficient α	+0.047 %/°C
Operating cell temperature	NOCT 45.8 °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
320 W	234.5 W	31.1 V × 7.54 A	59.9 W	94%
325 W	238.4 W	31.29 V × 7.62 A	60.9 W	94%
330 W	242 W	31.47 V × 7.69 A	61.8 W	94%
335 W	245.7 W	31.66 V × 7.76 A	62.7 W	94%
340 W	249.4 W	31.85 V × 7.83 A	63.7 W	94%
345 W	252.9 W	32.03 V × 7.89 A	64.6 W	94%
360 W	275.5 W	31.89 V × 8.64 A	73.8 W	102%
365 W	279.5 W	32.08 V × 8.71 A	74.8 W	103%
370 W	283.2 W	32.27 V × 8.78 A	75.8 W	102%
375 W	287 W	32.45 V × 8.84 A	76.9 W	102%
380 W	290.7 W	32.64 V × 8.91 A	77.9 W	102%
435 W	325.9 W	32.16 V × 10.13 A	83.8 W	96%
440 W	329.7 W	32.3 V × 10.21 A	84.8 W	96%
445 W	333.4 W	32.49 V × 10.26 A	85.7 W	96%
450 W	337.2 W	32.68 V × 10.32 A	86.7 W	96%
455 W	340.9 W	32.86 V × 10.37 A	87.7 W	96%
460 W	344.7 W	33.05 V × 10.43 A	88.6 W	96%
465 W	348.4 W	33.2 V × 10.49 A	89.6 W	96%
470 W	352.1 W	33.32 V × 10.57 A	90.5 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

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-120MH (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 tested355-400W

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

43.8 V

Voc when cold

per panel

27.6 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	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	9–11

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	43.8 / 27.6 V	⚠ Works; below MPPT at peak heat	1.29
Enphase IQ8X-80-M-US	320–540 W	79.5 V	43–60 V	43.8 / 27.6 V	✗ Not a match: module voltage below MPPT range	0.99
APsystems (Alt Power System) DS3-L	265–570 W	60 V	28–45 V	43.8 / 27.6 V	⚠ Works; below MPPT at peak heat	0.48
Enphase IQ8M-72-2-US	260–460 W	60 V	30–45 V	43.8 / 27.6 V	⚠ Works; below MPPT at peak heat	1.15
Enphase IQ8A-72-2-US	295–500 W	60 V	32–45 V	43.8 / 27.6 V	⚠ Works; below MPPT at peak heat	1.07

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	628	11,942	6.08
Palmdale	1,835	688	13,074	6.69
Chula Vista	1,696	636	12,084	6.11
Huntington Beach	1,643	616	11,706	5.89
Riverside	1,696	636	12,084	6.21
Santa Clarita	1,724	646	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 375 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)
VSUN (Vietnam Sunergy) VSUN375-120MH-BW	375 W	≈20.5%	−0.363	41.1	11.6	brand 6×	—
Qcells Q.PEAK DUO BLK ML-G10+ 380	380 W	≈19.4%	−0.362	45.16	11.01	product 2022, 2023	221
LONGi LR4-60HPB-370M	370 W	≈20.9%	−0.339	41.2	11.5	product 2021, 2022	193
REC Group REC380AA Pure	380 W	≈21.2%	−0.256	48.4	10.17	brand 9× (2016–2025)	66

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) VSUN375-120MH-BW?

Calculated from the panel area (1.83 m²): about 20.5% for the 375 W class. 375 W over 1.83 m² equals about 205 W per square meter.

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

PVWatts v8 with typical-year weather gives about 628 kWh per year per 375 W panel in Los Angeles and about 688 kWh in Palmdale (20° roof, facing south, 14% system losses).

How much power does it lose on a hot roof?

With γ = −0.363 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 18.8% 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 = 43.8 V, Vmp at 74 °C cell = 27.6 V). Final design must follow the inverter manual and NEC 690.7.

Has this panel been reliability-tested?

VSUNxxx-120MH 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).
Qcells — manufacturer datasheet “Q.PEAK DUO BLK ML-G10+ ENDURING HIGH PERFORMANCE”.
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).