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64.7″ · 1,644 mm
47.4″ · 1,204 mm wide · 1.57″ (40 mm) frame · 46.3 lb (21 kg)
Solar panelSolaria

Solaria Solaria PowerXT-400R-PM

380 cells. Power classes 395–420 W in the CEC list; datasheet covers 400–400 W.

CEC listed · Apr 21, 2020UL 61730Installed in 8 SoCal permits
Power class
  • Power (STC)400 WCEC nameplate
  • Efficiency≥20.2%datasheet minimum
  • %/°C Pmax−0.39CEC test: −0.429
  • PTC / STC91%PTC 364 W (CEC)

Power classes

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation · Solaria datasheet · 6 models
ModelPmaxVoc, VIsc, AVmp, VImp, AEfficiencyPTCCEC listed
Solaria PowerXT-395R-PM395 W50.709.7842.139.38≈20.0%359 WApr 21, 2020
Solaria PowerXT-400R-PM400 W51.109.8242.409.41≥20.2%364 WApr 21, 2020
Solaria PowerXT-405R-PM405 W51.409.8542.809.46≈20.5%369 WMay 1, 2020
Solaria PowerXT-410R-PM410 W51.709.8743.209.50≈20.7%374 WApr 21, 2020
Solaria PowerXT-415R-PM415 W52.109.9243.509.55≈21.0%378 WMay 1, 2020
Solaria PowerXT-420R-PM420 W52.409.9443.809.60≈21.2%383 WApr 21, 2020
AC version — Solaria PowerXT-xxxR-PM-AC (395–420 W) ships with a factory-mounted microinverter; it is a separate CEC listing.
≈ efficiency = Pmax ÷ panel area 1.979 m² (datasheet size) for classes outside the datasheet.

Build & dimensions

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

Heat & cold behaviour

Solaria datasheet · CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation
DatasheetCEC listing test
Pmax coefficient γ−0.39 %/°C−0.429 %/°C
Voc coefficient β−0.29 %/°C−0.327 %/°C
Isc coefficient α+0.04 %/°C+0.052 %/°C
Vmp coefficient≈ −0.43 %/°C—
Operating cell temperatureNMOT 45 °CNOCT 46.7 °C
Vmp coefficient ≈ γ − α (datasheet); used only for the hot-roof voltage estimate.

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

ClassPmax, WVoc, VIsc, AVmp, VImp, A
400 W295.048.107.9240.007.59

Away from lab conditions — CEC listing test points

ClassPmax at NOCTVmp × Imp at NOCTPmax at 200 W/m²Low-light efficiency vs STC
395 W280 W38.12 V × 7.35 A79.1 W100%
400 W282.7 W38.36 V × 7.37 A79.9 W100%
405 W286.9 W38.72 V × 7.41 A81.1 W100%
410 W290.8 W39.08 V × 7.44 A82.2 W100%
415 W294.4 W39.36 V × 7.48 A83.2 W100%
420 W297.9 W39.63 V × 7.52 A84.2 W100%
Pmax = Vmp × Imp from the CEC listing; low-light efficiency = Pmax at 200 W/m² ÷ (20% of STC Pmax).

Electrical & strength ratings

Solaria datasheet
Packaging: 25 per pallet

Certifications

CEC PV Module List (Oct 7, 2026) · Solaria datasheet
UL 61730UL 1703IEC 61215IEC 61730

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)
54.5 V
Voc when cold
per panel
33.5 V
Vmp when hot
per panel
11
Max panels / string
max DC 600 V
2
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

InverterMax DC inputMPPTWindow sourcePanels per string
Tesla 1538000-xx-y600 V60–480 Vdatasheet2–11
Solis (Ginlong) S6-EH1P10K-H-US600 V80–520 Vdatasheet3–11
Solis (Ginlong) Solis-1P7.6K-4G-US600 V100–500 Vdatasheet3–11
Qcells Q.VOLT H7.6SX498 V234–498 VCEC test window7–9

Microinverters (one per panel)

MicroinverterRecommended module powerMax DC inputMPPTVoc cold / Vmp hotCheckDC/AC
Enphase IQ8PLUS-72-2-US235–440 W60 V29–45 V54.5 / 33.5 V✓ Within range1.38
Enphase IQ8X-80-M-US320–540 W79.5 V43–60 V54.5 / 33.5 V✗ Not a match: module voltage below MPPT range1.05
APsystems (Alt Power System) DS3-L265–570 W60 V28–45 V54.5 / 33.5 V✓ Within range0.51
Enphase IQ8M-72-2-US260–460 W60 V30–45 V54.5 / 33.5 V✓ Within range1.23
Enphase IQ8A-72-2-US295–500 W60 V32–45 V54.5 / 33.5 V✓ Within range1.15
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
CitykWh / kW / yrkWh / panel / yrkWh / system / yrSun, kWh/m²/day
Los Angeles1,67667012,0676.08
Palmdale1,83573413,2126.69
Chula Vista1,69667812,2116.11
Huntington Beach1,64365711,8305.89
Riverside1,69667812,2116.21
Santa Clarita1,72469012,4136.28
788Jan788Feb1,012Mar1,117Apr1,104May1,173Jun1,236Jul1,250Aug1,093Sep964Oct829Nov717DeckWh per month · Los Angeles
Estimate for comparison, not a quote: shading, roof orientation and local losses change real output. Roof mount, 20° tilt, south, 14% system losses.

Who installs Solaria PowerXT-xxxR-PM panels in SoCal

building permits
8
Permits naming this series
Nov 2021 – Apr 2026
1
Jurisdictions so far
LA County (unincorp.) (8)

Permits over time

1Q4 ’2121Q2 ’2201Q4 ’2220Q2 ’2300Q4 ’2300Q2 ’2400Q4 ’2400Q2 ’2500Q4 ’2501Q2 ’26permits per quarter

Typical system

median 9.2 kW, 21 panels (n = 7)

Only installer and ZIP level is shown — no homeowner names, street addresses or permit numbers. Permits from LA County (unincorp.) come without a contractor license, so they count toward totals but not toward installers. Counts grow as more permit portals are loaded.

Installed together with

building permits

Microinverters

Enphase IQ8M
3

Inverters

SolarEdge SE…H (HD-Wave)
3

Optimizers

SolarEdge Power Optimizer
3
Number of permits naming both this panel series and the product; 8 of 8 permits list other equipment.

Other versions of this panel

CEC PV Module List (Oct 7, 2026)
Solaria Solaria PowerXT-xxxR-PM-AC
AC / DC version · 395–420 W · listed 2020

Compare with similar 400 W panels

CEC PV Module List (Oct 7, 2026) · Qcells datasheet · Kiwa PVEL Scorecard · building permits
PanelPmaxEfficiencyγ Pmax (CEC)Voc, VIsc, APVEL (product / brand)SoCal permits (series)
Solaria Solaria PowerXT-400R-PM400 W≥20.2%−0.42951.19.82—8
Qcells Q.PEAK DUO BLK ML-G10+ 400400 W≥20.4%−0.36245.311.14product 2022, 2023221
JA Solar JAM54S31-400/MR400 W≈21.1%−0.32937.0713.79product 2023, 2024152
REC Group REC400AA Pure400 W≈22.3%−0.25648.810.25brand 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

Questions & answers

How efficient is the Solaria Solaria PowerXT-400R-PM?

The Solaria datasheet guarantees at least 20.2% module efficiency for the 400 W class. 400 W over 1.98 m² equals about 202 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 = −0.39 %/°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 2–11 panels per string (Voc at 2 °C = 54.5 V, Vmp at 74 °C cell = 33.5 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 54.5 V vs max input 60 V; Vmp when hot 33.5 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?

64.7 × 47.4 × 1.57 in (1,644 × 1,204 × 40 mm), 46.3 lb (21 kg).

Sources

  1. California Energy Commission — Solar Equipment Lists, PV Module List, Inverter List (snapshot Oct 7, 2026).
  2. Solaria — datasheet Solar Panel Datasheets.
  3. Qcells — manufacturer datasheet “Q.PEAK DUO BLK ML-G10+ ENDURING HIGH PERFORMANCE”.
  4. Solaria — document library on the manufacturer’s website (links above).
  5. Kiwa PVEL — PV Module Reliability Scorecard, Top Performer lists.
  6. NLR (formerly NREL) — System Advisor Model CEC inverter library (version 2026.7.3).
  7. NLR (formerly NREL) — PVWatts v8, NSRDB PSM v3 typical-year weather for Los Angeles, Palmdale, Chula Vista, Huntington Beach, Riverside, Santa Clarita.
  8. Inverter datasheets — APsystems (Alt Power System), Enphase, Solis (Ginlong), Tesla (manufacturer documents).
  9. Building permits — Los Angeles County Public Works (EPIC-LA, unincorporated areas) (Nov 2021 – Apr 2026). Equipment matched from permit descriptions by model number.
  10. Cali-Graf calculations — formulas and inputs are shown next to each calculated value (efficiency from area, temperature-corrected voltages, string sizing, energy estimates).