Illustration · 144 half-cut cells

Solar panelSolar4America Technology

Solar4America Technology S4A575-144TH16STT

Name: Solar4America Technology S4A575-144TH16STT
Brand: Solar4America Technology

144 half-cut cells. Power classes 565–590 W in the CEC list.

CEC listed · Jul 22, 2024UL 61730

Power class

Power (STC)575 WCEC nameplate
Efficiency≈22.9%calculated from area
%/°C Pmax−0.293CEC listing test
PTC / STC95.2%PTC 547 W (CEC)

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
S4A565-144TH16STT	565 W	50.62	14.19	42.21	13.39	≈22.5%	537 W	Jul 22, 2024
S4A570-144TH16STT	570 W	50.76	14.25	42.43	13.43	≈22.7%	542 W	Jul 22, 2024
S4A575-144TH16STT	575 W	50.98	14.31	42.62	13.49	≈22.9%	547 W	Jul 22, 2024
S4A580-144TH16STT	580 W	51.34	14.37	42.82	13.55	≈23.1%	552 W	Jul 22, 2024
S4A585-144TH16STT	585 W	51.33	14.44	43.03	13.60	≈23.3%	557 W	Jul 22, 2024
S4A590-144TH16STT	590 W	51.83	14.49	43.21	13.65	≈23.5%	562 W	Jul 22, 2024

≈ efficiency = Pmax ÷ CEC-listed area 2.51 m².

Build & dimensions

CEC PV Module List (Oct 7, 2026)

Module area2.51 m² (27 ft²)CEC-listed area
Cells144 half-cut cells
Back coverTransparent backsheet
FrameSilver frame

Heat & cold behaviour

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

	CEC listing test
Pmax coefficient γ	−0.293 %/°C
Voc coefficient β	−0.230 %/°C
Isc coefficient α	+0.042 %/°C
Operating cell temperature	NOCT 43.1 °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
565 W	424.9 W	41.46 V × 10.25 A	106.8 W	95%
570 W	428.4 W	41.67 V × 10.28 A	107.7 W	94%
575 W	432.2 W	41.86 V × 10.33 A	108.6 W	94%
580 W	436.2 W	42.05 V × 10.37 A	109.6 W	95%
585 W	439.9 W	42.26 V × 10.41 A	110.6 W	95%
590 W	443.4 W	42.44 V × 10.45 A	111.5 W	94%

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

53.7 V

Voc when cold

per panel

35.6 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	2–11
Solis (Ginlong) S6-EH1P10K-H-US	600 V	80–520 V	datasheet	3–11
Solis (Ginlong) Solis-1P7.6K-4G-US	600 V	100–500 V	datasheet	3–11
Qcells Q.VOLT H7.6SX	498 V	234–498 V	CEC test window	7–9

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	964	11,564	6.08
Palmdale	1,835	1,055	12,662	6.69
Chula Vista	1,696	975	11,702	6.11
Huntington Beach	1,643	945	11,337	5.89
Riverside	1,696	975	11,702	6.21
Santa Clarita	1,724	991	11,896	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 575 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)
Solar4America Technology S4A575-144TH16STT	575 W	≈22.9%	−0.293	50.98	14.31	—	—
ZNShine Solar ZXM7-UHLDD144-575/N	575 W	≈22.5%	−0.281	51.3	14.29	product 2024, 2025, 2026	1
VSUN (Vietnam Sunergy) VSUN575N-144MH	575 W	≈22.3%	−0.309	51.81	13.77	brand 6× (2021–2026)	1
Phono Solar PS575M8GFH-24/TNH	575 W	≈22.5%	−0.293	52.5	13.6	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 Solar4America Technology S4A575-144TH16STT?

Calculated from the panel area (2.51 m²): about 22.9% for the 575 W class. 575 W over 2.51 m² equals about 229 W per square meter.

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

PVWatts v8 with typical-year weather gives about 964 kWh per year per 575 W panel in Los Angeles and about 1,055 kWh in Palmdale (20° roof, facing south, 14% system losses).

How much power does it lose on a hot roof?

With γ = −0.293 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 15.2% 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 2–11 panels per string (Voc at 2 °C = 53.7 V, Vmp at 74 °C cell = 35.6 V). Final design must follow the inverter manual and NEC 690.7.

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 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 — 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).