39.1″ · 992 mm wide

Solar panelRECOM

RECOM RCM-320-6PA

Name: RECOM RCM-320-6PA
Brand: RECOM

72 cells. Power classes 285–350 W in the CEC list.

CEC listed · Apr 21, 2020UL 1703

Power class

Power (STC)320 WCEC nameplate
Efficiency≈16.5%calculated from area
%/°C Pmax−0.400CEC listing test
PTC / STC91%PTC 291 W (CEC)

Power classes

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation · 17 models

Model	Pmax	Voc, V	Isc, A	Vmp, V	Imp, A	Efficiency	PTC
RCM-285-6PA	285 W	44.70	8.44	36.20	7.94	≈14.7%	257 W
RCM-290-6PA	290 W	44.80	8.56	36.30	8.00	≈14.9%	262 W
RCM-295-6PA	295 W	44.90	8.67	36.40	8.11	≈15.2%	266 W
RCM-300-6PA	300 W	44.80	8.69	36.60	8.20	≈15.5%	271 W
RCM-305-6PA	305 W	44.95	8.77	36.82	8.33	≈15.7%	275 W
RCM-310-6PA	310 W	45.00	8.92	37.00	8.42	≈16.0%	280 W
RCM-315-6PA	315 W	45.40	8.95	37.80	8.44	≈16.2%	287 W
RCM-320-6PA	320 W	45.94	8.99	38.23	8.46	≈16.5%	291 W
RCM-320-6PA	320 W	46.50	9.15	37.65	8.50	≈16.7%	289 W
RCM-325-6PA	325 W	46.15	9.02	38.47	8.49	≈16.7%	296 W
RCM-325-6PA	325 W	46.60	9.20	37.80	8.60	≈16.9%	293 W
RCM-330-6PA	330 W	46.51	9.07	38.83	8.54	≈17.0%	301 W
RCM-330-6PA	330 W	46.70	9.25	37.95	8.70	≈17.2%	298 W
RCM-335-6PA	335 W	46.80	9.30	38.10	8.80	≈17.4%	303 W
RCM-340-6PA	340 W	46.90	9.35	38.25	8.90	≈17.7%	310 W
RCM-345-6PA	345 W	47.00	9.40	38.55	8.95	≈18.0%	314 W
RCM-350-6PA	350 W	47.10	9.45	38.90	9.00	≈18.2%	319 W

≈ efficiency = Pmax ÷ CEC-listed area 1.94 m².

Build & dimensions

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

Dimensions77 × 39.1 in1,956 × 992 mm
Module area1.94 m² (20.9 ft²)length × width
Cells72 cells
Back coverWhite backsheet

Heat & cold behaviour

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

	CEC listing test
Pmax coefficient γ	−0.400 %/°C
Voc coefficient β	−0.300 %/°C
Isc coefficient α	+0.050 %/°C
Vmp coefficient	−0.390 %/°C
Operating cell temperature	NOCT 46.9 °C

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
285 W	210.2 W	33 V × 6.37 A	55.1 W	97%
290 W	212.4 W	33.09 V × 6.42 A	55.6 W	96%
295 W	216 W	33.18 V × 6.51 A	56.4 W	96%
300 W	219.5 W	33.36 V × 6.58 A	57.4 W	96%
305 W	224.5 W	33.56 V × 6.69 A	58.5 W	96%
310 W	228 W	33.73 V × 6.76 A	59.5 W	96%
315 W	233.6 W	34.56 V × 6.76 A	61.3 W	97%
320 W	236.8 W	34.96 V × 6.77 A	62.1 W	97%
320 W	235.8 W	34.51 V × 6.83 A	59.3 W	93%
325 W	239.1 W	35.17 V × 6.8 A	62.7 W	96%
325 W	239.5 W	34.65 V × 6.91 A	60.2 W	93%
330 W	242.8 W	35.5 V × 6.84 A	63.7 W	96%
330 W	243.2 W	34.78 V × 6.99 A	61.1 W	93%
335 W	247 W	34.92 V × 7.07 A	62.1 W	93%
340 W	250.7 W	35.27 V × 7.11 A	65.6 W	96%
345 W	254.1 W	35.54 V × 7.15 A	66.4 W	96%
350 W	257.8 W	35.87 V × 7.19 A	67.4 W	96%

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

Inverter compatibility & string sizing

CEC PV Module List (Oct 7, 2026) · NLR PVWatts v8 · inverter datasheets · NLR SAM inverter library · CEC Grid Support Inverter List (Oct 7, 2026)

CityColdest air, °CHottest cell, °CString inverter

49.1 V

Voc when cold

per panel

30.9 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. 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	2–12
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	49.1 / 30.9 V	✓ Within range	1.1
Enphase IQ8X-80-M-US	320–540 W	79.5 V	43–60 V	49.1 / 30.9 V	✗ Not a match: module voltage below MPPT range	0.84
APsystems (Alt Power System) DS3-L	265–570 W	60 V	28–45 V	49.1 / 30.9 V	✓ Within range	0.41
Enphase IQ8M-72-2-US	260–460 W	60 V	30–45 V	49.1 / 30.9 V	✓ Within range	0.98
Enphase IQ8A-72-2-US	295–500 W	60 V	32–45 V	49.1 / 30.9 V	⚠ Works; below MPPT at peak heat	0.92

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	536	11,799	6.08
Palmdale	1,835	587	12,918	6.69
Chula Vista	1,696	543	11,940	6.11
Huntington Beach	1,643	526	11,567	5.89
Riverside	1,696	543	11,940	6.21
Santa Clarita	1,724	552	12,137	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 320 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	PVEL (product / brand)	SoCal permits (series)
RECOM RCM-320-6PA	320 W	≈16.5%	−0.400	45.94	8.99	77 in	—	—
JinkoSolar JKM320M-60HBL	320 W	≈19%	−0.407	40.9	10.15	66.3 × 39.4 in	brand 12× (2014–2026)	45
LG Electronics LG320N1C-N5	320 W	≈18.5%	−0.342	40.8	10.53	66.9 × 40 in	product 2021	5
REC Group REC320NP	320 W	≈19.8%	−0.351	40.8	10.18	—	brand 9× (2016–2025)	4

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.

Questions & answers

How efficient is the RECOM RCM-320-6PA?

Calculated from the panel area (1.94 m²): about 16.5% for the 320 W class. 320 W over 1.94 m² equals about 165 W per square meter.

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

PVWatts v8 with typical-year weather gives about 536 kWh per year per 320 W panel in Los Angeles and about 587 kWh in Palmdale (20° roof, facing south, 14% system losses).

How much power does it lose on a hot roof?

With γ = −0.400 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 20.7% 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 2–12 panels per string (Voc at 2 °C = 49.1 V, Vmp at 74 °C cell = 30.9 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 49.1 V vs max input 60 V; Vmp when hot 30.9 V vs MPPT low 29 V; recommended module power 235–440 W. Confirm on the microinverter maker’s compatibility list.

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”.
LG Electronics — datasheet Specification Sheet.
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).