Illustration · 132 half-cut cells

Solar panelREC Group

REC Group REC400AA Pure

Name: REC Group REC400AA Pure
Brand: REC Group

132 half-cut cells. Power classes 380–410 W in the CEC list.

CEC listed · Jul 21, 2021UL 61730Installed in 66 SoCal permits

Power class

Power (STC)400 WCEC nameplate
Efficiency≈22.3%calculated from area
%/°C Pmax−0.256CEC listing test
PTC / STC95.2%PTC 381 W (CEC)

Power classes

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

Model	Pmax	Voc, V	Isc, A	Vmp, V	Imp, A	Efficiency	PTC	CEC listed
REC380AA Pure	380 W	48.40	10.17	40.90	9.30	≈21.2%	362 W	Mar 11, 2022
REC385AA Pure	385 W	48.50	10.10	41.20	9.35	≈21.5%	366 W	Jul 21, 2021
REC390AA Pure	390 W	48.60	10.19	41.50	9.40	≈21.8%	371 W	Jul 21, 2021
REC395AA Pure	395 W	48.70	10.20	41.80	9.45	≈22.0%	376 W	Jul 21, 2021
REC400AA Pure	400 W	48.80	10.25	42.10	9.51	≈22.3%	381 W	Jul 21, 2021
REC405AA Pure	405 W	48.90	10.30	42.40	9.56	≈22.6%	386 W	Jul 21, 2021
REC410AA Pure	410 W	49.00	10.35	42.70	9.61	≈22.9%	391 W	Feb 13, 2023

≈ efficiency = Pmax ÷ CEC-listed area 1.79 m².

Build & dimensions

CEC PV Module List (Oct 7, 2026)

Module area1.79 m² (19.3 ft²)CEC-listed area
Cells132 half-cut cells
Back coverBlack backsheet

Heat & cold behaviour

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

	CEC listing test
Pmax coefficient γ	−0.256 %/°C
Voc coefficient β	−0.233 %/°C
Isc coefficient α	+0.034 %/°C
Operating cell temperature	NOCT 45 °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
380 W	281.2 W	38.35 V × 7.33 A	69.9 W	92%
385 W	284.8 W	38.63 V × 7.37 A	70.8 W	92%
390 W	288.4 W	38.91 V × 7.41 A	71.7 W	92%
395 W	292 W	39.19 V × 7.45 A	72.6 W	92%
400 W	296 W	39.47 V × 7.5 A	73.6 W	92%
405 W	299.7 W	39.75 V × 7.54 A	74.5 W	92%
410 W	303.4 W	40.04 V × 7.58 A	75.4 W	92%

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

Independent reliability testing

Kiwa PVEL Scorecard · RETC PV Module Index

PVEL Scorecards

REC Group named Top Performer, 2016–2025

RETC PV Module Index

REC Group recognized 2023–2025

This exact series is not listed in published PVEL Top Performer tables. Results below are for the manufacturer.

RETC PV Module Index — REC Group

Year	Recognition
2023	High Achievement in Performance (Ptc-to-stc ratio, Module efficiency)
2024	High Achievement in Performance
2025	Test Category High Achiever

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

51.4 V

Voc when cold

per panel

36.1 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)

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	51.4 / 36.1 V	✓ Within range	1.38
Enphase IQ8X-80-M-US	320–540 W	79.5 V	43–60 V	51.4 / 36.1 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	51.4 / 36.1 V	✓ Within range	0.51
Enphase IQ8M-72-2-US	260–460 W	60 V	30–45 V	51.4 / 36.1 V	✓ Within range	1.23
Enphase IQ8A-72-2-US	295–500 W	60 V	32–45 V	51.4 / 36.1 V	✓ Within 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.

Who installs RECxxxAA Pure panels in SoCal

building permits · CSLB License Master

Permits naming this series

Dec 2021 – Feb 2025

Licensed installers

CSLB license on the permit

Jurisdictions so far

LA County (unincorp.) (65), Los Angeles (1)

Option One Solar

Apple Valley · CSLB #985340

1 installDec 2021Los Angeles

Permits over time

Power class named in permit

400 W

410 W

405 W

395 W

Top ZIP codes

ZIP 9100110
ZIP 917455
ZIP 917755
ZIP 935364
ZIP 902653
ZIP 917763
ZIP 906043
ZIP 911042
Other ZIP codes19

Typical system

median 8.4 kW, 18 panels (n = 44)

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 IQ8A

Enphase IQ8M

Enphase IQ8+

Enphase IQ7+

Enphase IQ7A

Inverters

SolarEdge SE…H (HD-Wave)

Optimizers

SolarEdge Power Optimizer

Batteries

Tesla Powerwall 2

Tesla Powerwall 3

Number of permits naming both this panel series and the product; 65 of 66 permits list other equipment.

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)
REC Group REC400AA Pure	400 W	≈22.3%	−0.256	48.8	10.25	brand 9×	66
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
LONGi LR5-54HABB-400M	400 W	≈21.1%	−0.342	37.05	13.72	brand 9× (2017–2026)	64

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.

About REC Group

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

ManufacturerREC Group
Listed in CEC asREC Group
PVEL Top Performer (manufacturer)9 Scorecards (2016–2025)
RETC PV Module Index2023, 2024, 2025
Current panel series in CEC list26

Other series by SoCal permits

RECxxxAA Pure-RX · 33RECxxxAA · 30RECxxxAA Black · 8RECxxxNP3 Black · 7RECxxxAA Pure 2 · 6RECxxxNP · 4

Questions & answers

How efficient is the REC Group REC400AA Pure?

Calculated from the panel area (1.79 m²): about 22.3% for the 400 W class. 400 W over 1.79 m² equals about 223 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 = −0.256 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 13.3% 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 2–11 panels per string (Voc at 2 °C = 51.4 V, Vmp at 74 °C cell = 36.1 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 51.4 V vs max input 60 V; Vmp when hot 36.1 V vs MPPT low 29 V; recommended module power 235–440 W. Confirm on the microinverter maker’s compatibility list.

Has this panel been reliability-tested?

This exact series is not in published PVEL Top Performer tables; REC Group was named a Top Performer in 9 Scorecards (2016–2025).

Who installs it in Southern California?

Building permits name this series 66 times (Dec 2021 – Feb 2025). The most active licensed installers are Option One Solar.

Sources

California Energy Commission — Solar Equipment Lists, PV Module List, Inverter List (snapshot Oct 7, 2026).
Qcells — manufacturer datasheet “Q.PEAK DUO BLK ML-G10+ ENDURING HIGH PERFORMANCE”.
Kiwa PVEL — PV Module Reliability Scorecard, Top Performer lists 2016–2025.
RETC — PV Module Index reports 2023–2025.
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) (Feb 2022 – Feb 2025); LADBS, City of Los Angeles (Dec 2021). Equipment matched from permit descriptions by model number.
Contractors State License Board — License Master (contractor names and license status), as of Oct 5, 2026.
Cali-Graf calculations — formulas and inputs are shown next to each calculated value (efficiency from area, temperature-corrected voltages, string sizing, energy estimates).