42.5″ · 1,079 mm wide · 1.38″ (35 mm) frame · 47.8 lb (21.7 kg)

Solar panelSolaria

Solaria PowerXT-420R-PL

Name: Solaria PowerXT-420R-PL
Brand: Solaria

408 cells. Power classes 415–430 W in the CEC list; datasheet covers 420–430 W.

CEC listed · Feb 22, 2022UL 61730

Power class

Power (STC)420 WCEC nameplate
Efficiency≥19.9%datasheet minimum
%/°C Pmax−0.39CEC test: −0.387
PTC / STC91.7%PTC 385 W (CEC)

Power classes

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation · Solaria datasheet · 4 models

Model	Pmax	Voc, V	Isc, A	Vmp, V	Imp, A	Efficiency	PTC	CEC listed
PowerXT-415R-PL	415 W	45.70	11.50	37.60	11.00	≈19.7%	380 W	Feb 22, 2022
PowerXT-420R-PL	420 W	45.70	11.60	37.90	11.09	≥19.9%	385 W	Feb 22, 2022
PowerXT-425R-PL	425 W	45.70	11.74	37.90	11.22	≈20.1%	390 W	Feb 22, 2022
PowerXT-430R-PL	430 W	45.70	11.87	37.90	11.35	≥20.4%	395 W	Feb 22, 2022

≈ efficiency = Pmax ÷ panel area 2.112 m² (datasheet size) for classes outside the datasheet.

Build & dimensions

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

Dimensions77 × 42.5 × 1.38 in1,957 × 1,079 × 35 mm
Module area2.11 m² (22.7 ft²)length × width
Weight47.8 lb (21.7 kg)
Cells408 cells
Back coverBlack backsheet
FrameBlack Anodized Aluminum
Junction boxIP68 / 4 diodes
Cable / connectorMC4

Heat & cold behaviour

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

	Datasheet	CEC listing test
Pmax coefficient γ	−0.39 %/°C	−0.387 %/°C
Voc coefficient β	−0.29 %/°C	−0.292 %/°C
Isc coefficient α	+0.04 %/°C	+0.045 %/°C
Vmp coefficient	≈ −0.43 %/°C	—
Operating cell temperature	NMOT 45 °C	NOCT 47.2 °C

Vmp coefficient ≈ γ − α (datasheet); used only for the hot-roof voltage estimate.

At normal operating conditions (NOCT, 800 W/m²) — datasheet

Class	Pmax, W	Voc, V	Isc, A	Vmp, V	Imp, A
420 W	310.0	43.00	9.36	34.60	8.95
430 W	317.0	43.00	9.57	34.60	9.15

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
415 W	300.6 W	34.6 V × 8.69 A	77.5 W	93%
420 W	305.5 W	34.88 V × 8.76 A	78.8 W	94%
425 W	309 W	34.88 V × 8.86 A	79.7 W	94%
430 W	312.6 W	34.88 V × 8.96 A	80.6 W	94%

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

Electrical & strength ratings

Solaria datasheet

Max system voltage1,000 V
Max series fuse20 A
Module temperature−40 °F to +185 °F−40 °C to +85 °C

Packaging: 29 per pallet

Certifications

CEC PV Module List (Oct 7, 2026) · Solaria datasheet

UL 61730UL 1703IEC 61215IEC 61730

UL 61730CEC listing
UL 1703datasheet
IEC 61215datasheet
IEC 61730datasheet

Inverter compatibility & string sizing

Solaria datasheet · Cali-Graf calculation · NLR PVWatts v8 · CEC PV Module List (Oct 7, 2026) · inverter datasheets · NLR SAM inverter library · CEC Grid Support Inverter List (Oct 7, 2026)

CityColdest air, °CHottest cell, °CString inverter

48.7 V

Voc when cold

per panel

29.9 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.

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	3–12
Solis (Ginlong) S6-EH1P10K-H-US	600 V	80–520 V	datasheet	3–12
Solis (Ginlong) Solis-1P7.6K-4G-US	600 V	100–500 V	datasheet	4–12
Qcells Q.VOLT H7.6SX	498 V	234–498 V	CEC test window	8–10

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	48.7 / 29.9 V	✓ Within range	1.45
Enphase IQ8X-80-M-US	320–540 W	79.5 V	43–60 V	48.7 / 29.9 V	✗ Not a match: module voltage below MPPT range	1.11
APsystems (Alt Power System) DS3-L	265–570 W	60 V	28–45 V	48.7 / 29.9 V	✓ Within range	0.54
Enphase IQ8M-72-2-US	260–460 W	60 V	30–45 V	48.7 / 29.9 V	⚠ Works; below MPPT at peak heat	1.29
Enphase IQ8A-72-2-US	295–500 W	60 V	32–45 V	48.7 / 29.9 V	⚠ Works; below MPPT at peak heat	1.2

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	704	11,967	6.08
Palmdale	1,835	771	13,102	6.69
Chula Vista	1,696	712	12,109	6.11
Huntington Beach	1,643	690	11,731	5.89
Riverside	1,696	712	12,109	6.21
Santa Clarita	1,724	724	12,309	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 420 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)
Solaria PowerXT-420R-PL	420 W	≥19.9%	−0.387	45.7	11.6	—	—
Qcells Q.PEAK DUO BLK ML-G10+ 415	415 W	≈21.1%	−0.337	45.41	11.23	product 2022, 2023	221
LONGi LR5-54HABB-415M	415 W	≈21.8%	−0.342	37.77	13.94	brand 9× (2017–2026)	64
Canadian Solar CS3N-420MS	420 W	≥20.7%	−0.332	45.3	11.74	product 2023	46

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.

Documents

manufacturer documents

PDF
Solar Panel Datasheets
Datasheet · Solaria

Questions & answers

How efficient is the Solaria PowerXT-420R-PL?

The Solaria datasheet guarantees at least 19.9% module efficiency for the 420 W class (up to 20.4% for 430 W). 420 W over 2.11 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 704 kWh per year per 420 W panel in Los Angeles and about 771 kWh in Palmdale (20° roof, facing south, 14% system losses).

How much power does it lose on a hot roof?

With γ = −0.39 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 20.2% 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 3–12 panels per string (Voc at 2 °C = 48.7 V, Vmp at 74 °C cell = 29.9 V). Final design must follow the inverter manual and NEC 690.7.

Does it work with Enphase IQ8PLUS-72-2-US microinverters?

Voltage check against the Enphase datasheet: Voc when cold 48.7 V vs max input 60 V; Vmp when hot 29.9 V vs MPPT low 29 V; recommended module power 235–440 W. Confirm on the microinverter maker’s compatibility list.

How big and heavy is it?

77 × 42.5 × 1.38 in (1,957 × 1,079 × 35 mm), 47.8 lb (21.7 kg).

Sources

California Energy Commission — Solar Equipment Lists, PV Module List, Inverter List (snapshot Oct 7, 2026).
Solaria — datasheet Solar Panel Datasheets.
Qcells — manufacturer datasheet “Q.PEAK DUO BLK ML-G10+ ENDURING HIGH PERFORMANCE”.
Canadian Solar — manufacturer datasheet “HiKu Mono PERC CS3N-400|405|410|415|420|425MS MORE POWER”.
Solaria — document library on the manufacturer’s website (links above).
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 — 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).