44.6″ · 1,134 mm wide · 1.38″ (35 mm) frame · 48.7 lb (22.1 kg)

Solar panelSolaria

Solaria PowerX-400R

Name: Solaria PowerX-400R
Brand: Solaria

108 cells. Power classes 390–405 W in the CEC list; datasheet covers 390–400 W.

CEC listed · Aug 1, 2022UL 61730Seen in 1 SoCal permit

Power class

Power (STC)400 WCEC nameplate
Efficiency≥20.5%datasheet minimum
%/°C Pmax−0.36CEC test: −0.362
PTC / STC91.2%PTC 365 W (CEC)

Power classes

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

Model	Pmax	Voc, V	Isc, A	Vmp, V	Imp, A	Efficiency	PTC	CEC listed
PowerX-390R	390 W	36.84	13.50	30.82	12.56	≥20.0%	356 W	Aug 1, 2022
PowerX-395R	395 W	37.03	13.59	31.00	12.75	≥20.2%	360 W	Aug 1, 2022
PowerX-400R	400 W	37.20	13.68	31.17	12.84	≥20.5%	365 W	Aug 1, 2022
PowerX-405R	405 W	37.36	13.78	31.36	12.92	≈20.7%	370 W	Aug 1, 2022

≈ efficiency = Pmax ÷ panel area 1.954 m² (datasheet size) for classes outside the datasheet.

Build & dimensions

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

Dimensions67.8 × 44.6 × 1.38 in1,723 × 1,134 × 35 mm
Module area1.95 m² (21 ft²)length × width
Weight48.7 lb (22.1 kg)
Cells108 cells
Back coverBlack backsheet
FrameBlack Anodized Aluminum
Junction boxIP68 / 3 diodes
Cable / connectorStaubli MC4

Heat & cold behaviour

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

	Datasheet	CEC listing test
Pmax coefficient γ	−0.36 %/°C	−0.362 %/°C
Voc coefficient β	−0.28 %/°C	−0.272 %/°C
Isc coefficient α	+0.05 %/°C	+0.050 %/°C
Vmp coefficient	≈ −0.41 %/°C	—
Operating cell temperature	NMOT 45 °C	NOCT 50.3 °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
390 W	290.0	34.30	11.01	28.50	10.20
395 W	293.0	34.50	11.10	28.60	10.26
400 W	297.0	34.70	11.13	28.76	10.32

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
390 W	268.4 W	27.56 V × 9.74 A	72.7 W	93%
395 W	274.1 W	27.72 V × 9.89 A	74.2 W	94%
400 W	277.5 W	27.87 V × 9.96 A	75.2 W	94%
405 W	281 W	28.04 V × 10.02 A	76.1 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 fuse25 A
Module temperature−40 °F to +185 °F−40 °C to +85 °C

Packaging: 31 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

39.6 V

Voc when cold

per panel

24.9 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	3–15
Solis (Ginlong) S6-EH1P10K-H-US	600 V	80–520 V	datasheet	4–15
Solis (Ginlong) Solis-1P7.6K-4G-US	600 V	100–500 V	datasheet	5–15
Qcells Q.VOLT H7.6SX	498 V	234–498 V	CEC test window	10–12

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	39.6 / 24.9 V	⚠ Works; below MPPT at peak heat	1.38
Enphase IQ8X-80-M-US	320–540 W	79.5 V	43–60 V	39.6 / 24.9 V	✗ Not a match: module voltage below MPPT range	1.05
APsystems (Alt Power System) DS3-L	265–570 W	60 V	28–45 V	39.6 / 24.9 V	⚠ Works; below MPPT at peak heat	0.51
Enphase IQ8M-72-2-US	260–460 W	60 V	30–45 V	39.6 / 24.9 V	⚠ Works; below MPPT at peak heat	1.23
Enphase IQ8A-72-2-US	295–500 W	60 V	32–45 V	39.6 / 24.9 V	✗ Not a match: module voltage below MPPT range	1.15

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	670	12,067	6.08
Palmdale	1,835	734	13,212	6.69
Chula Vista	1,696	678	12,211	6.11
Huntington Beach	1,643	657	11,830	5.89
Riverside	1,696	678	12,211	6.21
Santa Clarita	1,724	690	12,413	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 400 W panels

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

Panel	Pmax	Efficiency	γ Pmax (CEC)	Voc, V	Isc, A	PVEL (product / brand)	SoCal permits (series)
Solaria PowerX-400R	400 W	≥20.5%	−0.362	37.2	13.68	—	1
Qcells Q.PEAK DUO BLK ML-G10+ 400	400 W	≥20.4%	−0.362	45.3	11.14	product 2022, 2023	221
JA Solar JAM54S31-400/MR	400 W	≈21.1%	−0.329	37.07	13.79	product 2023, 2024	152
REC Group REC400AA Pure	400 W	≈22.3%	−0.256	48.8	10.25	brand 9× (2016–2025)	66

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 PowerX-400R?

The Solaria datasheet guarantees at least 20.5% module efficiency for the 400 W class. 400 W over 1.95 m² equals about 205 W per square meter.

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

PVWatts v8 with typical-year weather gives about 670 kWh per year per 400 W panel in Los Angeles and about 734 kWh in Palmdale (20° roof, facing south, 14% system losses).

How much power does it lose on a hot roof?

With γ = −0.36 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 18.6% 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 3–15 panels per string (Voc at 2 °C = 39.6 V, Vmp at 74 °C cell = 24.9 V). Final design must follow the inverter manual and NEC 690.7.

How big and heavy is it?

67.8 × 44.6 × 1.38 in (1,723 × 1,134 × 35 mm), 48.7 lb (22.1 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”.
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 — Los Angeles County Public Works (EPIC-LA, unincorporated areas) (Nov 2023). Equipment matched from permit descriptions by model number.
Cali-Graf calculations — formulas and inputs are shown next to each calculated value (efficiency from area, temperature-corrected voltages, string sizing, energy estimates).