Illustration · 60 half-cut cells

Solar panelVSUN (Vietnam Sunergy)

VSUN (Vietnam Sunergy) VSUN320-60M

Name: VSUN (Vietnam Sunergy) VSUN320-60M
Brand: VSUN (Vietnam Sunergy)

60 half-cut cells, PERC. Power classes 300–325 W in the CEC list.

CEC listed · Nov 1, 2019UL 61730PERCMADE IN VIETNAM

Power class

Power (STC)320 WCEC nameplate
Efficiency≈19.2%calculated from area
%/°C Pmax−0.370CEC listing test
Performance warranty30 yrdatasheet

Power classes

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation · 6 models

Model	Pmax	Voc, V	Isc, A	Vmp, V	Imp, A	Efficiency	PTC	CEC listed
VSUN300-60M	300 W	39.80	9.74	32.60	9.21	≈18.7%	278 W	Nov 1, 2019
VSUN305-60M	305 W	40.00	9.83	32.80	9.30	≈19.0%	283 W	Nov 1, 2019
VSUN310-60M	310 W	40.20	9.92	33.00	9.40	≈19.3%	288 W	Nov 1, 2019
VSUN315-60M	315 W	40.40	10.01	33.20	9.49	≈19.6%	292 W	Nov 1, 2019
VSUN320-60M	320 W	40.60	10.12	33.40	9.59	≈19.2%	294 W	Nov 1, 2019
VSUN325-60M	325 W	40.70	10.24	33.60	9.68	≈19.5%	299 W	Apr 13, 2020

≈ efficiency = Pmax ÷ CEC-listed area 1.61 m².

Build & dimensions

CEC PV Module List (Oct 7, 2026) · VSUN (Vietnam Sunergy) datasheets

Module area1.61 m² (17.3 ft²)CEC-listed area
Cells60 half-cut cellsPERC
Back coverTransparent black-mesh
FrameWhite frame
Junction boxIP68, 3 diodes
Cable / connectorPotrait: 500 mm (cable length can be customized , 1x4 mm2, c
Made inMADE IN VIETNAM

Heat & cold behaviour

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

	Datasheet	CEC listing test
Pmax coefficient γ	—	−0.370 %/°C
Voc coefficient β	—	−0.271 %/°C
Isc coefficient α	—	+0.041 %/°C
Vmp coefficient	≈ −0.41 %/°C	—
Operating cell temperature	NMOT 45 °C	NOCT 47 °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
300 W	224.1 W	30.74 V × 7.29 A	58.2 W	97%
305 W	227.7 W	30.92 V × 7.36 A	59.2 W	97%
310 W	231.5 W	31.11 V × 7.44 A	60.2 W	97%
315 W	235.2 W	31.3 V × 7.51 A	61.1 W	97%
320 W	231 W	30.55 V × 7.56 A	61 W	95%
325 W	234.5 W	30.73 V × 7.63 A	61.9 W	95%

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)

Warranty & degradation

VSUN (Vietnam Sunergy) datasheet

Performance warranty30 years, linear

Independent reliability testing

Kiwa PVEL Scorecard · RETC PV Module Index

PVEL Scorecards

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

2025, 2026

RETC Overall Highest Achiever

VSUN (Vietnam Sunergy), manufacturer level

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

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

43.1 V

Voc when cold

per panel

26.7 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	43.1 / 26.7 V	⚠ Works; below MPPT at peak heat	1.1
Enphase IQ8X-80-M-US	320–540 W	79.5 V	43–60 V	43.1 / 26.7 V	✗ Not a match: module voltage below MPPT range	0.84
APsystems (Alt Power System) DS3-L	265–570 W	60 V	28–45 V	43.1 / 26.7 V	⚠ Works; below MPPT at peak heat	0.41
Enphase IQ8M-72-2-US	260–460 W	60 V	30–45 V	43.1 / 26.7 V	⚠ Works; below MPPT at peak heat	0.98
Enphase IQ8A-72-2-US	295–500 W	60 V	32–45 V	43.1 / 26.7 V	⚠ Works; below MPPT at peak heat	0.92

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	536	11,799	6.08
Palmdale	1,835	587	12,918	6.69
Chula Vista	1,696	543	11,940	6.11
Huntington Beach	1,643	526	11,567	5.89
Riverside	1,696	543	11,940	6.21
Santa Clarita	1,724	552	12,137	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 320 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	PVEL (product / brand)	SoCal permits (series)
VSUN (Vietnam Sunergy) VSUN320-60M	320 W	≈19.2%	−0.370	40.6	10.12	brand 6×	—
JinkoSolar JKM320M-60HBL	320 W	≈19%	−0.407	40.9	10.15	brand 12× (2014–2026)	45
LG Electronics LG320N1C-N5	320 W	≈18.5%	−0.342	40.8	10.53	product 2021	5
REC Group REC320NP	320 W	≈19.8%	−0.351	40.8	10.18	brand 9× (2016–2025)	4

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) VSUN320-60M?

Calculated from the panel area (1.61 m²): about 19.2% for the 320 W class. 320 W over 1.61 m² equals about 199 W per square meter.

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

PVWatts v8 with typical-year weather gives about 536 kWh per year per 320 W panel in Los Angeles and about 587 kWh in Palmdale (20° roof, facing south, 14% system losses).

How much power does it lose on a hot roof?

With γ = −0.370 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 19.2% 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 3–13 panels per string (Voc at 2 °C = 43.1 V, Vmp at 74 °C cell = 26.7 V). Final design must follow the inverter manual and NEC 690.7.

What does the warranty cover?

30 years linear on performance (manufacturer datasheet).

Has this panel been reliability-tested?

This exact series is not in published PVEL Top Performer tables; VSUN (Vietnam Sunergy) was named a Top Performer in 6 Scorecards (2021–2026). RETC named VSUN (Vietnam Sunergy) Overall Highest Achiever in 2025, 2026.

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”.
VSUN (Vietnam Sunergy) — manufacturer datasheet “MADE IN VIETNAM, manufacture by VIETNAM SUNERGY JOINT STOCK COMPANY”.
JinkoSolar — datasheet THE MOST DEPENDABLE SOLAR BRAND.
JinkoSolar — manufacturer datasheet “Eagle HC 60M G2 315-335 Watt MONO PERC HALF CELL MODULE”.
LG Electronics — datasheet Specification Sheet.
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).