44.6″ · 1,134 mm wide · 1.18″ (30 mm) frame · 47.2 lb (21.4 kg)

Solar panelVSUN (Vietnam Sunergy)

VSUN (Vietnam Sunergy) VSUN400-108BMH

Name: VSUN (Vietnam Sunergy) VSUN400-108BMH
Brand: VSUN (Vietnam Sunergy)

108 half-cut cells (12 × 9), PERC, bifacial, transparent black-mesh. Power classes 395–410 W in the CEC list; datasheet covers 390–405 W.

CEC listed · May 11, 2022UL 61730Bifacial · 70 ± 10%PVEL Top Performer 2023PERCSeen in 1 SoCal permit

Power class

Power (STC)400 WCEC nameplate
Efficiency≥20.5%datasheet minimum
%/°C Pmax−0.321CEC listing test
Performance warranty30 yrdatasheet

Power classes

CEC PV Module List (Oct 7, 2026) · VSUN (Vietnam Sunergy) datasheet · Cali-Graf calculation · 4 models

Model	Pmax	Voc, V	Isc, A	Vmp, V	Imp, A	Efficiency	PTC	CEC listed
VSUN395-108BMH	395 W	37.03	13.59	31.00	12.75	≥20.2%	370 W	May 11, 2022
VSUN400-108BMH	400 W	37.20	13.68	31.17	12.84	≥20.5%	375 W	May 11, 2022
VSUN405-108BMH	405 W	37.36	13.78	31.36	12.92	≥20.7%	380 W	May 11, 2022
VSUN410-108BMH	410 W	37.54	13.86	31.55	13.00	≈21.0%	385 W	May 11, 2022

≈ efficiency = Pmax ÷ panel area 1.953 m² (datasheet size) for classes outside the datasheet.

Build & dimensions

VSUN (Vietnam Sunergy) datasheet · Cali-Graf calculation

Dimensions67.8 × 44.6 × 1.18 in1,722 × 1,134 × 30 mm
Module area1.95 m² (21 ft²)length × width
Weight47.2 lb (21.4 kg)
Cells108 half-cut cells (12 × 9)PERC
Front glassWhite toughened safety glass, 3.2 mm
Back coverTransparent black-mesh
FrameBlack anodized aluminum profile
Junction boxIP68, 3 diodes
Cable / connectorPotrait: 500 mm (cable length can be customized , 1x4 mm2, c

Heat & cold behaviour

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

	Datasheet	CEC listing test
Pmax coefficient γ	—	−0.321 %/°C
Voc coefficient β	—	−0.257 %/°C
Isc coefficient α	—	+0.043 %/°C
Vmp coefficient	≈ −0.36 %/°C	—
Operating cell temperature	NMOT 45 °C	NOCT 45.4 °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
395 W	297.2 W	29.28 V × 10.15 A	76 W	96%
400 W	300.9 W	29.44 V × 10.22 A	77 W	96%
405 W	304.6 W	29.62 V × 10.28 A	77.9 W	96%
410 W	308.4 W	29.8 V × 10.35 A	78.9 W	96%

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 fuse30 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)

Bifacial performance

NLR SAM module library · VSUN (Vietnam Sunergy) datasheet

BifacialYes
Bifaciality70 ± 10%
Back coverTransparent black-mesh

Rear gain depends on mounting height and ground reflectance; flush roof mounts receive little rear light.

Warranty & degradation

VSUN (Vietnam Sunergy) datasheet

Performance warranty30 years, linear

Independent reliability testing

Kiwa PVEL Scorecard · RETC PV Module Index

2023

PVEL Top Performer

this series

Tests passed as Top Performer

DH, LID+LETID, PID, 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
2023	VSUNxxx-108BMH	DHLID+LETIDPIDTC
2023	VSUNxxx-108BMH-DG (closely related product name)	DHLID+LETIDPIDTC

Tested bill of materials

PVEL-tested factoryVietnam
Cell technology (tested BOM)p-type PERC
Module design (tested BOM)bifacial - glass//backsheet
Power class range tested380-425W

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

39.4 V

Voc when cold

per panel

25.6 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	3–15
Solis (Ginlong) S6-EH1P10K-H-US	600 V	80–520 V	datasheet	4–15
Solis (Ginlong) Solis-1P7.6K-4G-US	600 V	100–500 V	datasheet	4–15
Qcells Q.VOLT H7.6SX	498 V	234–498 V	CEC test window	10–12

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	39.4 / 25.6 V	⚠ Works; below MPPT at peak heat	1.38
Enphase IQ8X-80-M-US	320–540 W	79.5 V	43–60 V	39.4 / 25.6 V	✗ Not a match: module voltage below MPPT range	1.05
APsystems (Alt Power System) DS3-L	265–570 W	60 V	28–45 V	39.4 / 25.6 V	⚠ Works; below MPPT at peak heat	0.51
Enphase IQ8M-72-2-US	260–460 W	60 V	30–45 V	39.4 / 25.6 V	⚠ Works; below MPPT at peak heat	1.23
Enphase IQ8A-72-2-US	295–500 W	60 V	32–45 V	39.4 / 25.6 V	✗ Not a match: module voltage below MPPT range	1.15

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	670	12,067	6.08
Palmdale	1,835	734	13,212	6.69
Chula Vista	1,696	678	12,211	6.11
Huntington Beach	1,643	657	11,830	5.89
Riverside	1,696	678	12,211	6.21
Santa Clarita	1,724	690	12,413	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 400 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) VSUN400-108BMH	400 W	≥20.5%	−0.321	37.2	13.68	product 2023	1
Qcells Q.PEAK DUO BLK ML-G10+ 400	400 W	≥20.4%	−0.362	45.3	11.14	product 2022, 2023	221
JA Solar JAM54S31-400/MR	400 W	≈21.1%	−0.329	37.07	13.79	product 2023, 2024	152
REC Group REC400AA Pure	400 W	≈22.3%	−0.256	48.8	10.25	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-108M-BB · 1VSUNxxxN-108BMHVSUNxxxN-108BMH-BT

Questions & answers

How efficient is the VSUN (Vietnam Sunergy) VSUN400-108BMH?

The VSUN (Vietnam Sunergy) datasheet guarantees at least 20.5% module efficiency for the 400 W class (up to 20.7% for 405 W). 400 W over 1.95 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 670 kWh per year per 400 W panel in Los Angeles and about 734 kWh in Palmdale (20° roof, facing south, 14% system losses).

How much power does it lose on a hot roof?

With γ = −0.321 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 16.6% 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 3–15 panels per string (Voc at 2 °C = 39.4 V, Vmp at 74 °C cell = 25.6 V). Final design must follow the inverter manual and NEC 690.7.

What does the warranty cover?

30 years linear on performance (manufacturer datasheet).

How big and heavy is it?

67.8 × 44.6 × 1.18 in (1,722 × 1,134 × 30 mm), 47.2 lb (21.4 kg).

Is it bifacial?

Yes, bifaciality 70 ± 10%. Rear gain depends on mounting height and ground reflectance.

Has this panel been reliability-tested?

VSUNxxx-108BMH was a PVEL Top Performer in 2023 (DH, LID+LETID, PID, TC).

Sources

California Energy Commission — Solar Equipment Lists, PV Module List, Inverter List (snapshot Oct 7, 2026).
VSUN (Vietnam Sunergy) — manufacturer datasheet “VSUN405-108BMH VSUN320-60M VSUN405-108BMH VSUN400-108BMH”.
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 module and inverter libraries (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 — Los Angeles County Public Works (EPIC-LA, unincorporated areas) (Apr 2023). Equipment matched from permit descriptions by model number.
Cali-Graf calculations — formulas and inputs are shown next to each calculated value (efficiency from area, temperature-corrected voltages, string sizing, energy estimates).