Illustration · 64 cells

Solar panelRNG International

RNG International RSP240D-BK-64

Name: RNG International RSP240D-BK-64
Brand: RNG International

64 cells. Power classes 235–245 W in the CEC list.

CEC listed · May 11, 2023UL 61730

Power class

Power (STC)240 WCEC nameplate
Efficiency≈20.5%calculated from area
%/°C Pmax−0.328CEC listing test
PTC / STC94.3%PTC 226 W (CEC)

Power classes

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation · 3 models

Model	Pmax	Voc, V	Isc, A	Vmp, V	Imp, A	Efficiency	PTC	CEC listed
RSP235D-BK-64	235 W	21.87	13.57	18.51	12.70	≈20.1%	222 W	May 11, 2023
RSP240D-BK-64	240 W	22.10	13.64	18.77	12.79	≈20.5%	226 W	May 11, 2023
RSP245D-BK-64	245 W	22.28	13.71	18.95	12.93	≈20.9%	231 W	May 11, 2023

≈ efficiency = Pmax ÷ CEC-listed area 1.17 m².

Build & dimensions

CEC PV Module List (Oct 7, 2026)

Module area1.17 m² (12.6 ft²)CEC-listed area
Cells64 cells
Back coverWhite backsheet
FrameBlack frame

Heat & cold behaviour

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

	CEC listing test
Pmax coefficient γ	−0.328 %/°C
Voc coefficient β	−0.289 %/°C
Isc coefficient α	+0.035 %/°C
Operating cell temperature	NOCT 43.2 °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
235 W	176.7 W	17.39 V × 10.16 A	45 W	96%
240 W	180.5 W	17.63 V × 10.23 A	45.9 W	96%
245 W	184.2 W	17.8 V × 10.35 A	46.9 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) · 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

23.6 V

Voc when cold

per panel

15.4 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	4–25
Solis (Ginlong) S6-EH1P10K-H-US	600 V	80–520 V	datasheet	6–25
Solis (Ginlong) Solis-1P7.6K-4G-US	600 V	100–500 V	datasheet	7–25
Qcells Q.VOLT H7.6SX	498 V	234–498 V	CEC test window	16–21

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	23.6 / 15.4 V	✗ Not a match: module voltage below MPPT range	0.83

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	402	11,665	6.08
Palmdale	1,835	440	12,772	6.69
Chula Vista	1,696	407	11,804	6.11
Huntington Beach	1,643	394	11,435	5.89
Riverside	1,696	407	11,804	6.21
Santa Clarita	1,724	414	11,999	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.

Questions & answers

How efficient is the RNG International RSP240D-BK-64?

Calculated from the panel area (1.17 m²): about 20.5% for the 240 W class. 240 W over 1.17 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 402 kWh per year per 240 W panel in Los Angeles and about 440 kWh in Palmdale (20° roof, facing south, 14% system losses).

How much power does it lose on a hot roof?

With γ = −0.328 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 17% 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 4–25 panels per string (Voc at 2 °C = 23.6 V, Vmp at 74 °C cell = 15.4 V). Final design must follow the inverter manual and NEC 690.7.

Sources

California Energy Commission — Solar Equipment Lists, PV Module List, Inverter List (snapshot Oct 7, 2026).
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 — Enphase, Solis (Ginlong), Tesla (manufacturer documents).
Cali-Graf calculations — formulas and inputs are shown next to each calculated value (efficiency from area, temperature-corrected voltages, string sizing, energy estimates).