Illustration · 120 half-cut cells

Solar panelREC Group

REC Group REC325NP

Name: REC Group REC325NP
Brand: REC Group

120 half-cut cells. Power classes 295–335 W in the CEC list.

CEC listed · Sep 4, 2018UL 61730Installed in 4 SoCal permits

Power class

Power (STC)325 WCEC nameplate
Efficiency≈20.1%calculated from area
%/°C Pmax−0.351CEC listing test
PTC / STC93.5%PTC 304 W (CEC)

Power classes

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation · 9 models

Model	Pmax	Voc, V	Isc, A	Vmp, V	Imp, A	Efficiency	PTC	CEC listed
REC295NP	295 W	39.40	9.76	32.70	9.04	≈18.2%	275 W	Sep 4, 2018
REC300NP	300 W	39.60	9.85	33.00	9.10	≈18.5%	280 W	Sep 4, 2018
REC305NP	305 W	39.90	9.93	33.30	9.17	≈18.8%	285 W	Sep 4, 2018
REC310NP	310 W	40.20	10.01	33.60	9.24	≈19.1%	290 W	Sep 4, 2018
REC315NP	315 W	40.50	10.09	33.90	9.31	≈19.4%	294 W	Sep 4, 2018
REC320NP	320 W	40.80	10.18	34.20	9.37	≈19.8%	299 W	Sep 4, 2018
REC325NP	325 W	41.00	10.27	34.40	9.46	≈20.1%	304 W	Sep 4, 2018
REC330NP	330 W	41.00	10.33	34.60	9.55	≈20.5%	309 W	Apr 21, 2020
REC335NP	335 W	41.30	10.38	34.80	9.64	≈20.8%	314 W	Mar 11, 2021

≈ efficiency = Pmax ÷ CEC-listed area 1.62 m².

Build & dimensions

CEC PV Module List (Oct 7, 2026)

Module area1.62 m² (17.4 ft²)CEC-listed area
Cells120 half-cut cells
Back coverWhite backsheet

Heat & cold behaviour

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

	CEC listing test
Pmax coefficient γ	−0.351 %/°C
Voc coefficient β	−0.266 %/°C
Isc coefficient α	+0.040 %/°C
Operating cell temperature	NOCT 44.1 °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
295 W	218.2 W	30.33 V × 7.19 A	55.3 W	94%
300 W	221.6 W	30.6 V × 7.24 A	56.2 W	94%
305 W	225.4 W	30.88 V × 7.3 A	57.2 W	94%
310 W	229.1 W	31.16 V × 7.35 A	58.1 W	94%
315 W	232.9 W	31.44 V × 7.41 A	59.1 W	94%
320 W	236.5 W	31.72 V × 7.46 A	60 W	94%
325 W	240.2 W	31.9 V × 7.53 A	60.9 W	94%
330 W	244.6 W	32.07 V × 7.63 A	62.3 W	94%
335 W	248.4 W	32.26 V × 7.7 A	63.3 W	94%

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

Certifications

CEC PV Module List (Oct 7, 2026)

UL 61730IEC 61215

UL 61730CEC listing
IEC 61215design qualification on file with CEC · Dec 20, 2018

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

43.5 V

Voc when cold

per panel

27.8 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	3–13
Solis (Ginlong) S6-EH1P10K-H-US	600 V	80–520 V	datasheet	3–13
Solis (Ginlong) Solis-1P7.6K-4G-US	600 V	100–500 V	datasheet	4–13
Qcells Q.VOLT H7.6SX	498 V	234–498 V	CEC test window	9–11

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	43.5 / 27.8 V	⚠ Works; below MPPT at peak heat	1.12
Enphase IQ8X-80-M-US	320–540 W	79.5 V	43–60 V	43.5 / 27.8 V	✗ Not a match: module voltage below MPPT range	0.86
APsystems (Alt Power System) DS3-L	265–570 W	60 V	28–45 V	43.5 / 27.8 V	⚠ Works; below MPPT at peak heat	0.42
Enphase IQ8M-72-2-US	260–460 W	60 V	30–45 V	43.5 / 27.8 V	⚠ Works; below MPPT at peak heat	1
Enphase IQ8A-72-2-US	295–500 W	60 V	32–45 V	43.5 / 27.8 V	⚠ Works; below MPPT at peak heat	0.93

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	545	11,983	6.08
Palmdale	1,835	596	13,120	6.69
Chula Vista	1,696	551	12,126	6.11
Huntington Beach	1,643	534	11,747	5.89
Riverside	1,696	551	12,126	6.21
Santa Clarita	1,724	560	12,327	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 RECxxxNP panels in SoCal

building permits

Permits naming this series

Dec 2021 – Aug 2024

Jurisdictions so far

LA County (unincorp.) (4)

Permits over time

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 IQ7+

Batteries

Enphase IQ Battery 10

Number of permits naming both this panel series and the product; 3 of 4 permits list other equipment.

Compare with similar 325 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	Size	Warranty	PVEL (product / brand)	SoCal permits (series)
REC Group REC325NP	325 W	≈20.1%	−0.351	41	10.27	—	—	brand 9×	4
JinkoSolar JKM325M-60HBL	325 W	≈19.3%	−0.407	41.1	10.2	66.3 × 39.4 in	10 / 25 yr	brand 12× (2014–2026)	45
Qcells Q.PEAK DUO-G8+ 330	330 W	≈18.4%	−0.343	39.71	10.52	68.5 × 40.6 in	25 / 25 yr	product 2022	20
LG Electronics LG325N1C-N5	325 W	≈18.8%	−0.342	40.9	10.57	66.9 × 40 in	25 / 25 yr	product 2021	5

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 · 66RECxxxAA Pure-RX · 33RECxxxAA · 30RECxxxAA Black · 8RECxxxNP3 Black · 7RECxxxAA Pure 2 · 6

Questions & answers

How efficient is the REC Group REC325NP?

Calculated from the panel area (1.62 m²): about 20.1% for the 325 W class. 325 W over 1.62 m² equals about 201 W per square meter.

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

PVWatts v8 with typical-year weather gives about 545 kWh per year per 325 W panel in Los Angeles and about 596 kWh in Palmdale (20° roof, facing south, 14% system losses).

How much power does it lose on a hot roof?

With γ = −0.351 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 18.2% 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 3–13 panels per string (Voc at 2 °C = 43.5 V, Vmp at 74 °C cell = 27.8 V). Final design must follow the inverter manual and NEC 690.7.

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).

Sources

California Energy Commission — Solar Equipment Lists, PV Module List, Inverter List (snapshot Oct 7, 2026).
JinkoSolar — datasheet THE MOST DEPENDABLE SOLAR BRAND.
JinkoSolar — manufacturer datasheet “Eagle HC 60M G2 315-335 Watt MONO PERC HALF CELL MODULE”.
Qcells — manufacturer datasheet “Q.PEAK DUO-G8+ 345-360 EN ENDURING HIGH”.
LG Electronics — datasheet Specification Sheet.
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) (Dec 2021 – Aug 2024). 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).