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Illustration · 156 half-cut cells
Solar panelHengdian Group DMEGC Magnetics

Hengdian Group DMEGC Magnetics DM620M10T-B78yyy

156 half-cut cells. Power classes 600–645 W in the CEC list.

CEC listed · Jul 11, 2025UL 61730
Power class
  • Power (STC)620 WCEC nameplate
  • Efficiency≈22.2%calculated from area
  • %/°C Pmax−0.301CEC listing test
  • PTC / STC94%PTC 583 W (CEC)

Power classes

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation · 10 models
ModelPmaxVoc, VIsc, AVmp, VImp, AEfficiencyPTCCEC listed
DM600M10T-B78yyy600 W56.1013.7046.3012.95≈21.5%564 WJul 11, 2025
DM605M10T-B78yyy605 W56.3013.7546.5013.00≈21.7%568 WJul 11, 2025
DM610M10T-B78yyy610 W56.5013.8146.7013.06≈21.9%573 WJul 11, 2025
DM615M10T-B78yyy615 W56.7013.8746.9013.12≈22.0%578 WJul 11, 2025
DM620M10T-B78yyy620 W56.9013.9347.1013.18≈22.2%583 WJul 11, 2025
DM625M10T-B78yyy625 W57.1013.9947.3013.24≈22.4%588 WJul 11, 2025
DM630M10T-B78yyy630 W57.3014.0447.5013.29≈22.6%593 WJul 11, 2025
DM635M10T-B78yyy635 W57.5014.0947.7013.34≈22.8%597 WJul 11, 2025
DM640M10T-B78yyy640 W57.7014.1447.9013.39≈22.9%602 WJul 11, 2025
DM645M10T-B78yyy645 W57.9014.1948.1013.44≈23.1%607 WJul 11, 2025
≈ efficiency = Pmax ÷ CEC-listed area 2.79 m².

Build & dimensions

CEC PV Module List (Oct 7, 2026)

Heat & cold behaviour

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation
CEC listing test
Pmax coefficient γ−0.301 %/°C
Voc coefficient β−0.246 %/°C
Isc coefficient α+0.042 %/°C
Operating cell temperatureNOCT 46.4 °C
Vmp coefficient ≈ γ − α (CEC); used only for the hot-roof voltage estimate.

Away from lab conditions — CEC listing test points

ClassPmax at NOCTVmp × Imp at NOCTPmax at 200 W/m²Low-light efficiency vs STC
600 W456.3 W44 V × 10.37 A116.7 W97%
605 W460.1 W44.2 V × 10.41 A117.7 W97%
610 W464 W44.4 V × 10.45 A119 W98%
615 W468.3 W44.6 V × 10.5 A120 W98%
620 W471.6 W44.7 V × 10.55 A120.9 W98%
625 W475.9 W44.9 V × 10.6 A121.9 W97%
630 W479.9 W45.1 V × 10.64 A122.8 W97%
635 W483.8 W45.3 V × 10.68 A123.8 W97%
640 W487.8 W45.5 V × 10.72 A124.7 W97%
645 W491.7 W45.7 V × 10.76 A125.7 W97%
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
6
PVEL Scorecards
Hengdian Group DMEGC Magnetics named Top Performer, 2021–2026
2025
RETC Overall Highest Achiever
Hengdian Group DMEGC Magnetics, manufacturer level
This exact series is not listed in published PVEL Top Performer tables. Results below are for the manufacturer.

RETC PV Module Index — Hengdian Group DMEGC Magnetics

YearRecognition
2025Overall Highest Achiever

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)
60.1 V
Voc when cold
per panel
39.2 V
Vmp when hot
per panel
9
Max panels / string
max DC 600 V
2
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

InverterMax DC inputMPPTWindow sourcePanels per string
Tesla 1538000-xx-y600 V60–480 Vdatasheet2–9
Solis (Ginlong) S6-EH1P10K-H-US600 V80–520 Vdatasheet3–9
Solis (Ginlong) Solis-1P7.6K-4G-US600 V100–500 Vdatasheet3–9
Qcells Q.VOLT H7.6SX498 V234–498 VCEC test window6–8

Microinverters (one per panel)

No microinverter in the reference set lists this power class in its recommended module power range.
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
CitykWh / kW / yrkWh / panel / yrkWh / system / yrSun, kWh/m²/day
Los Angeles1,6761,03911,4306.08
Palmdale1,8351,13812,5156.69
Chula Vista1,6961,05211,5676.11
Huntington Beach1,6431,01911,2055.89
Riverside1,6961,05211,5676.21
Santa Clarita1,7241,06911,7586.28
746Jan747Feb958Mar1,058Apr1,046May1,111Jun1,170Jul1,184Aug1,035Sep913Oct785Nov679DeckWh per month · Los Angeles
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 620 W panels

CEC PV Module List (Oct 7, 2026) · Kiwa PVEL Scorecard · datasheets
PanelPmaxEfficiencyγ Pmax (CEC)Voc, VIsc, APVEL (product / brand)
Hengdian Group DMEGC Magnetics DM620M10T-B78yyy620 W≈22.2%−0.30156.913.93brand 6×
ZNShine Solar ZXM7-UHLDD144-615/N615 W≈24%−0.28152.914.72product 2024, 2025, 2026
JinkoSolar JKM620N-66HL4M-BDV620 W≈23%−0.29949.0816.08product 2025
Waaree BiN-21-620620 W≥22.9%−0.28849.116.02product 2026
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 Hengdian Group DMEGC Magnetics

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

Other series by SoCal permits

DMxxxG12RT-B66yyyDMxxxM10RT-B54yyyDMxxxM10T-B54yyyDMxxxM10T-B72yyy

Questions & answers

How efficient is the Hengdian Group DMEGC Magnetics DM620M10T-B78yyy?

Calculated from the panel area (2.79 m²): about 22.2% for the 620 W class. 620 W over 2.79 m² equals about 222 W per square meter.

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

PVWatts v8 with typical-year weather gives about 1,039 kWh per year per 620 W panel in Los Angeles and about 1,138 kWh in Palmdale (20° roof, facing south, 14% system losses).

How much power does it lose on a hot roof?

With γ = −0.301 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 15.6% 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 2–9 panels per string (Voc at 2 °C = 60.1 V, Vmp at 74 °C cell = 39.2 V). Final design must follow the inverter manual and NEC 690.7.

Has this panel been reliability-tested?

This exact series is not in published PVEL Top Performer tables; Hengdian Group DMEGC Magnetics was named a Top Performer in 6 Scorecards (2021–2026). RETC named Hengdian Group DMEGC Magnetics Overall Highest Achiever in 2025.

Sources

  1. California Energy Commission — Solar Equipment Lists, PV Module List, Inverter List (snapshot Oct 7, 2026).
  2. JinkoSolar — datasheet THE MOST DEPENDABLE SOLAR PRODUCT.
  3. Waaree — datasheet ELITE-R-SERIES-BiN-21-600-635-WEL-EPD-600-635-132-BiN-HC.
  4. Kiwa PVEL — PV Module Reliability Scorecard, Top Performer lists 2021–2026.
  5. RETC — PV Module Index report.
  6. NLR (formerly NREL) — System Advisor Model CEC inverter library (version 2026.7.3).
  7. NLR (formerly NREL) — PVWatts v8, NSRDB PSM v3 typical-year weather for Los Angeles, Palmdale, Chula Vista, Huntington Beach, Riverside, Santa Clarita.
  8. Inverter datasheets — Solis (Ginlong), Tesla (manufacturer documents).
  9. Cali-Graf calculations — formulas and inputs are shown next to each calculated value (efficiency from area, temperature-corrected voltages, string sizing, energy estimates).