Illustration · 48 cells

Solar panelLumos

Lumos S48-280-29-IM

Name: Lumos S48-280-29-IM
Brand: Lumos

48 cells, bifacial, glass (dual-glass module). Power classes 270–290 W in the CEC list.

CEC listed · Apr 2, 2024UL 61730Bifacial

Power class

Power (STC)280 WCEC nameplate
Efficiency≈14.5%calculated from area
%/°C Pmax−0.370CEC listing test
PTC / STC92.8%PTC 260 W (CEC)

Power classes

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation · 5 models

Model	Pmax	Voc, V	Isc, A	Vmp, V	Imp, A	Efficiency	PTC	CEC listed
S48-270-29-IM	270 W	32.50	11.10	26.23	10.48	≈14.0%	250 W	Apr 2, 2024
S48-275-29-IM	275 W	32.60	11.20	26.40	10.58	≈14.2%	255 W	Apr 2, 2024
S48-280-29-IM	280 W	32.70	11.30	26.50	10.68	≈14.5%	260 W	Apr 2, 2024
S48-285-29-IM	285 W	32.80	11.40	26.60	10.78	≈14.8%	264 W	Apr 2, 2024
S48-290-29-IM	290 W	32.90	11.50	26.80	10.88	≈15.0%	269 W	Apr 2, 2024

≈ efficiency = Pmax ÷ CEC-listed area 1.93 m².

Build & dimensions

CEC PV Module List (Oct 7, 2026)

Module area1.93 m² (20.8 ft²)CEC-listed area
Cells48 cells
Back coverGlass (dual-glass module)

Heat & cold behaviour

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

	CEC listing test
Pmax coefficient γ	−0.370 %/°C
Voc coefficient β	−0.324 %/°C
Isc coefficient α	+0.030 %/°C
Operating cell temperature	NOCT 43.5 °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
270 W	196.5 W	23.43 V × 8.39 A	52.3 W	97%
275 W	199.7 W	23.58 V × 8.47 A	53.2 W	97%
280 W	202.3 W	23.67 V × 8.55 A	53.9 W	96%
285 W	205 W	23.76 V × 8.63 A	54.6 W	96%
290 W	208.4 W	23.94 V × 8.71 A	55.5 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

35.1 V

Voc when cold

per panel

21.3 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	3–17
Solis (Ginlong) S6-EH1P10K-H-US	600 V	80–520 V	datasheet	4–17
Solis (Ginlong) Solis-1P7.6K-4G-US	600 V	100–500 V	datasheet	5–17
Qcells Q.VOLT H7.6SX	498 V	234–498 V	CEC test window	11–14

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	35.1 / 21.3 V	✗ Not a match: module voltage below MPPT range	0.97
APsystems (Alt Power System) DS3-L	265–570 W	60 V	28–45 V	35.1 / 21.3 V	✗ Not a match: module voltage below MPPT range	0.36
Enphase IQ8M-72-2-US	260–460 W	60 V	30–45 V	35.1 / 21.3 V	✗ Not a match: module voltage below MPPT range	0.86

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	469	11,732	6.08
Palmdale	1,835	514	12,845	6.69
Chula Vista	1,696	475	11,872	6.11
Huntington Beach	1,643	460	11,501	5.89
Riverside	1,696	475	11,872	6.21
Santa Clarita	1,724	483	12,068	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 280 W panels

CEC PV Module List (Oct 7, 2026) · datasheets · Kiwa PVEL Scorecard

Panel	Pmax	Efficiency	γ Pmax (CEC)	Voc, V	Isc, A	Size	PVEL (product / brand)
Lumos S48-280-29-IM	280 W	≈14.5%	−0.370	32.7	11.3	—	—
Silfab Solar SIL285NL	285 W	≈16.8%	−0.379	39.1	9.47	66.9 × 39.4 in	brand 7× (2017–2025)
Hyundai Energy Solutions HiS-C280RG(BK)	280 W	≥17.3%	−0.382	38.28	9.25	64.6 × 39.3 in	brand 5× (2017–2025)
Qcells Q.PEAK BLK-G4.1 285	285 W	≈17.1%	−0.392	38.91	9.56	65.7 × 39.4 in	brand 11× (2016–2026)

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 Lumos S48-280-29-IM?

Calculated from the panel area (1.93 m²): about 14.5% for the 280 W class. 280 W over 1.93 m² equals about 145 W per square meter.

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

PVWatts v8 with typical-year weather gives about 469 kWh per year per 280 W panel in Los Angeles and about 514 kWh in Palmdale (20° roof, facing south, 14% system losses).

How much power does it lose on a hot roof?

With γ = −0.370 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 19.1% 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 3–17 panels per string (Voc at 2 °C = 35.1 V, Vmp at 74 °C cell = 21.3 V). Final design must follow the inverter manual and NEC 690.7.

Is it bifacial?

Yes. Rear gain depends on mounting height and ground reflectance.

Sources

California Energy Commission — Solar Equipment Lists, PV Module List, Inverter List (snapshot Oct 7, 2026).
Silfab Solar — datasheet SIL-310 NL BAA JUST ARRA -IN-.
Hyundai Energy Solutions — datasheet [Customized Module] RG(BK) Series (PERC) 265~285W.
Qcells — manufacturer datasheet “Q.PEAK BLK-G4.1 285-295 Q.ANTUM SOLAR MODULE The new high-performance module Q.PEAK BLK-G4.1 is the ideal solu-”.
Kiwa PVEL — PV Module Reliability Scorecard, Top Performer lists.
NLR (formerly NREL) — System Advisor Model CEC module and inverter libraries (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).
Cali-Graf calculations — formulas and inputs are shown next to each calculated value (efficiency from area, temperature-corrected voltages, string sizing, energy estimates).