Illustration · 156 half-cut cells

Solar panelJiangsu Xiehang New Energy Int…

Jiangsu Xiehang New Energy Intelligent Equipment FE78-18X 580

Name: Jiangsu Xiehang New Energy Intelligent Equipment FE78-18X 580
Brand: Jiangsu Xiehang New Energy Intelligent Equipment

156 half-cut cells, bifacial, transparent backsheet. Power classes 560–600 W in the CEC list.

CEC listed · Aug 1, 2022UL 61730Bifacial

Power class

Power (STC)580 WCEC nameplate
Efficiency≈20.7%calculated from area
%/°C Pmax−0.334CEC listing test
PTC / STC93.1%PTC 540 W (CEC)

Power classes

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation · 9 models

Model	Pmax	Voc, V	Isc, A	Vmp, V	Imp, A	Efficiency	PTC	CEC listed
FE78-18X-560	560 W	52.89	13.54	44.38	12.62	≈20.0%	521 W	Aug 1, 2022
FE78-18X-565	565 W	53.04	13.61	44.53	12.69	≈20.2%	526 W	Aug 1, 2022
FE78-18X-570	570 W	53.19	13.68	44.68	12.76	≈20.4%	531 W	Aug 1, 2022
FE78-18X-575	575 W	53.34	13.75	44.83	12.83	≈20.5%	535 W	Aug 1, 2022
FE78-18X-580	580 W	53.49	13.82	44.98	12.90	≈20.7%	540 W	Aug 1, 2022
FE78-18X-585	585 W	53.64	13.89	45.13	12.97	≈20.9%	545 W	Aug 1, 2022
FE78-18X-590	590 W	53.79	13.96	45.28	13.04	≈21.1%	550 W	Aug 1, 2022
FE78-18X-595	595 W	53.94	14.03	45.43	13.11	≈21.2%	554 W	Aug 1, 2022
FE78-18X-600	600 W	54.09	14.10	45.58	13.17	≈21.4%	559 W	Aug 1, 2022

≈ efficiency = Pmax ÷ CEC-listed area 2.8 m².

Build & dimensions

CEC PV Module List (Oct 7, 2026)

Module area2.8 m² (30.1 ft²)CEC-listed area
Cells156 half-cut cells
Back coverTransparent backsheet
FrameWhite frame

Heat & cold behaviour

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

	CEC listing test
Pmax coefficient γ	−0.334 %/°C
Voc coefficient β	−0.253 %/°C
Isc coefficient α	+0.044 %/°C
Operating cell temperature	NOCT 46.6 °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
560 W	423.7 W	41.45 V × 10.22 A	108.9 W	97%
565 W	427.5 W	41.59 V × 10.28 A	109.8 W	97%
570 W	431.3 W	41.73 V × 10.34 A	110.8 W	97%
575 W	435.1 W	41.87 V × 10.39 A	111.8 W	97%
580 W	438.9 W	42.01 V × 10.45 A	112.8 W	97%
585 W	442.8 W	42.15 V × 10.51 A	113.8 W	97%
590 W	446.7 W	42.29 V × 10.56 A	114.8 W	97%
595 W	450.6 W	42.43 V × 10.62 A	115.8 W	97%
600 W	454.1 W	42.57 V × 10.67 A	116.7 W	97%

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

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

56.6 V

Voc when cold

per panel

36.6 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	2–10
Solis (Ginlong) S6-EH1P10K-H-US	600 V	80–520 V	datasheet	3–10
Solis (Ginlong) Solis-1P7.6K-4G-US	600 V	100–500 V	datasheet	3–10
Qcells Q.VOLT H7.6SX	498 V	234–498 V	CEC test window	7–8

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

PanelsCity for chartSystem size

City	kWh / kW / yr	kWh / panel / yr	kWh / system / yr	Sun, kWh/m²/day
Los Angeles	1,676	972	11,665	6.08
Palmdale	1,835	1,064	12,772	6.69
Chula Vista	1,696	984	11,804	6.11
Huntington Beach	1,643	953	11,435	5.89
Riverside	1,696	984	11,804	6.21
Santa Clarita	1,724	1,000	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 580 W panels

CEC PV Module List (Oct 7, 2026) · Kiwa PVEL Scorecard · building permits

Panel	Pmax	Efficiency	γ Pmax (CEC)	Voc, V	Isc, A	PVEL (product / brand)	SoCal permits (series)
Jiangsu Xiehang New Energy Intelligent Equipment FE78-18X 580	580 W	≈20.7%	−0.334	53.49	13.82	—	—
ZNShine Solar ZXM7-UHLDD144-580/N	580 W	≈22.7%	−0.281	51.5	14.35	product 2024, 2025, 2026	1
VSUN (Vietnam Sunergy) VSUN580N-144MH	580 W	≈22.5%	−0.309	52.02	13.83	brand 6× (2021–2026)	1
Phono Solar PS580M8GFH-24/TNH	580 W	≈22.7%	−0.293	52.7	13.66	product 2024, 2025	1

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.

Questions & answers

How efficient is the Jiangsu Xiehang New Energy Intelligent Equipment FE78-18X 580?

Calculated from the panel area (2.8 m²): about 20.7% for the 580 W class. 580 W over 2.8 m² equals about 207 W per square meter.

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

PVWatts v8 with typical-year weather gives about 972 kWh per year per 580 W panel in Los Angeles and about 1,064 kWh in Palmdale (20° roof, facing south, 14% system losses).

How much power does it lose on a hot roof?

With γ = −0.334 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 17.3% 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 2–10 panels per string (Voc at 2 °C = 56.6 V, Vmp at 74 °C cell = 36.6 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.

Sources

California Energy Commission — Solar Equipment Lists, PV Module List, Inverter List (snapshot Oct 7, 2026).
Kiwa PVEL — PV Module Reliability Scorecard, Top Performer lists.
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 — 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).