Illustration · 108 half-cut cells

Solar panelES Foundry

ES Foundry ES-DN8-H54B 435

Name: ES Foundry ES-DN8-H54B 435
Brand: ES Foundry

108 half-cut cells, bifacial, glass (dual-glass module). Power classes 420–450 W in the CEC list.

CEC listed · May 21, 2026UL 61730Bifacial

Power class

Power (STC)435 WCEC nameplate
Efficiency≈22.3%calculated from area
%/°C Pmax−0.284CEC listing test
PTC / STC95.1%PTC 414 W (CEC)

Power classes

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

Model	Pmax	Voc, V	Isc, A	Vmp, V	Imp, A	Efficiency	PTC	CEC listed
ES-DN8-H54B-420	420 W	38.40	13.56	32.49	12.93	≈21.6%	399 W	May 21, 2026
ES-DN8-H54B-425	425 W	38.59	13.64	32.67	13.01	≈21.8%	404 W	May 21, 2026
ES-DN8-H54B-430	430 W	38.78	13.72	32.85	13.09	≈22.1%	409 W	May 21, 2026
ES-DN8-H54B-435	435 W	38.97	13.80	33.03	13.17	≈22.3%	414 W	May 21, 2026
ES-DN8-H54B-440	440 W	39.16	13.88	33.21	13.25	≈22.6%	419 W	May 21, 2026
ES-DN8-H54B-445	445 W	39.35	13.96	33.39	13.33	≈22.9%	424 W	May 21, 2026
ES-DN8-H54B-450	450 W	39.54	14.04	33.57	13.40	≈23.1%	428 W	May 21, 2026

≈ efficiency = Pmax ÷ CEC-listed area 1.95 m².

Build & dimensions

CEC PV Module List (Oct 7, 2026)

Module area1.95 m² (21 ft²)CEC-listed area
Cells108 half-cut cells
Back coverGlass (dual-glass module)

Heat & cold behaviour

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

	CEC listing test
Pmax coefficient γ	−0.284 %/°C
Voc coefficient β	−0.229 %/°C
Isc coefficient α	+0.036 %/°C
Operating cell temperature	NOCT 43.5 °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
420 W	321.8 W	30.84 V × 10.44 A	82.8 W	99%
425 W	325.6 W	31.01 V × 10.5 A	83.7 W	99%
430 W	329.4 W	31.18 V × 10.56 A	84.7 W	98%
435 W	333.2 W	31.35 V × 10.63 A	85.7 W	98%
440 W	337.1 W	31.52 V × 10.69 A	86.7 W	99%
445 W	340.9 W	31.69 V × 10.76 A	87.7 W	99%
450 W	344.6 W	31.86 V × 10.82 A	88.6 W	98%

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

Certifications

CEC PV Module List (Oct 7, 2026)

UL 61730IEC 61215

UL 61730CEC listing
IEC 61215design qualification on file with CEC · Apr 7, 2026

Independent reliability testing

Kiwa PVEL Scorecard · RETC PV Module Index

PVEL Scorecards

ES Foundry, 2026

2024

RETC Overall Highest Achiever

ES Foundry, manufacturer level

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

RETC PV Module Index — ES Foundry

Year	Recognition
2024	Overall 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)

CityColdest air, °CHottest cell, °CString inverter

41 V

Voc when cold

per panel

27.8 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	3–14
Solis (Ginlong) S6-EH1P10K-H-US	600 V	80–520 V	datasheet	3–14
Solis (Ginlong) Solis-1P7.6K-4G-US	600 V	100–500 V	datasheet	4–14
Qcells Q.VOLT H7.6SX	498 V	234–498 V	CEC test window	9–12

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	41 / 27.8 V	⚠ Works; below MPPT at peak heat	1.5
Enphase IQ8X-80-M-US	320–540 W	79.5 V	43–60 V	41 / 27.8 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	41 / 27.8 V	⚠ Works; below MPPT at peak heat	0.56
Enphase IQ8M-72-2-US	260–460 W	60 V	30–45 V	41 / 27.8 V	⚠ Works; below MPPT at peak heat	1.34
Enphase IQ8A-72-2-US	295–500 W	60 V	32–45 V	41 / 27.8 V	⚠ Works; below MPPT at peak heat	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	Warranty	PVEL (product / brand)	SoCal permits (series)
ES Foundry ES-DN8-H54B 435	435 W	≈22.3%	−0.284	38.97	13.8	—	brand 1×	—
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	25 / 25 yr	brand 11× (2016–2026)	40
Silfab Solar SIL-435QD	435 W	≈22.3%	−0.294	38.94	14.05	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 ES Foundry

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

ManufacturerES Foundry
Listed in CEC asES Foundry Corp
PVEL Top Performer (manufacturer)2026 Scorecard
RETC PV Module Index2024
Current panel series in CEC list4

Other series by SoCal permits

ES-DP8-H54BES-DP8-H72ES-DP8-H72L

Questions & answers

How efficient is the ES Foundry ES-DN8-H54B 435?

Calculated from the panel area (1.95 m²): about 22.3% for the 435 W class. 435 W over 1.95 m² equals about 223 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 = −0.284 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 14.7% 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 3–14 panels per string (Voc at 2 °C = 41 V, Vmp at 74 °C cell = 27.8 V). Final design must follow the inverter manual and NEC 690.7.

Is it bifacial?

Yes. Rear gain depends on mounting height and ground reflectance.

Has this panel been reliability-tested?

This exact series is not in published PVEL Top Performer tables; ES Foundry was named a Top Performer in 1 Scorecard (2026). RETC named ES Foundry Overall Highest Achiever in 2024.

Sources

California Energy Commission — Solar Equipment Lists, PV Module List, Inverter List (snapshot Oct 7, 2026).
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.
RETC — PV Module Index report.
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 — 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).