Illustration · 108 half-cut cells

Solar panelNuuko Solar

Nuuko Solar NKM505N-108BDR12

Name: Nuuko Solar NKM505N-108BDR12
Brand: Nuuko Solar

108 half-cut cells, bifacial. Power classes 490–520 W in the CEC list.

CEC listed · Sep 1, 2026UL 61730Bifacial

Power class

Power (STC)505 WCEC nameplate
Efficiency≈22.7%calculated from area
%/°C Pmax−0.298CEC listing test
PTC / STC94.2%PTC 476 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
NKM490N-108BDR12	490 W	40.56	15.34	33.75	14.52	≈22.1%	461 W	Sep 1, 2026
NKM495N-108BDR12	495 W	40.72	15.43	33.88	14.61	≈22.3%	466 W	Sep 1, 2026
NKM500N-108BDR12	500 W	40.89	15.52	34.02	14.70	≈22.5%	471 W	Sep 1, 2026
NKM505N-108BDR12	505 W	41.05	15.61	34.15	14.79	≈22.7%	476 W	Sep 1, 2026
NKM510N-108BDR12	510 W	41.21	15.70	34.29	14.87	≈23.0%	481 W	Sep 1, 2026
NKM515N-108BDR12	515 W	41.37	15.79	34.42	14.96	≈23.2%	486 W	Sep 1, 2026
NKM520N-108BDR12	520 W	41.53	15.88	34.56	15.05	≈23.4%	490 W	Sep 1, 2026

≈ efficiency = Pmax ÷ CEC-listed area 2.22 m².

Heat & cold behaviour

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

	CEC listing test
Pmax coefficient γ	−0.298 %/°C
Voc coefficient β	−0.252 %/°C
Isc coefficient α	+0.046 %/°C
Operating cell temperature	NOCT 46.1 °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
490 W	367.9 W	31.39 V × 11.72 A	94.7 W	97%
495 W	371.6 W	31.51 V × 11.79 A	95.7 W	97%
500 W	375.5 W	31.64 V × 11.87 A	96.7 W	97%
505 W	379.2 W	31.76 V × 11.94 A	97.6 W	97%
510 W	382.8 W	31.89 V × 12 A	98.6 W	97%
515 W	386.6 W	32.01 V × 12.08 A	99.5 W	97%
520 W	390.5 W	32.14 V × 12.15 A	100.5 W	97%

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

43.4 V

Voc when cold

per panel

28.4 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	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 IQ8X-80-M-US	320–540 W	79.5 V	43–60 V	43.4 / 28.4 V	✗ Not a match: module voltage below MPPT range	1.33
APsystems (Alt Power System) DS3-L	265–570 W	60 V	28–45 V	43.4 / 28.4 V	✓ Within range	0.65

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	846	11,849	6.08
Palmdale	1,835	927	12,973	6.69
Chula Vista	1,696	856	11,991	6.11
Huntington Beach	1,643	830	11,616	5.89
Riverside	1,696	856	11,991	6.21
Santa Clarita	1,724	871	12,189	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 505 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	SoCal permits (series)
Nuuko Solar NKM505N-108BDR12	505 W	≈22.7%	−0.298	41.05	15.61	—
SEG Solar SEG-505-BTD-BG	505 W	≈25.9%	−0.290	40.3	15.95	8
Qcells Q.PEAK DUO XL-G10.d 505	505 W	≈21.8%	−0.340	53.78	11.39	6
AXITEC AC-530MH/144V	530 W	≥20.5%	−0.366	49.3	13.72	1

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 Nuuko Solar NKM505N-108BDR12?

Calculated from the panel area (2.22 m²): about 22.7% for the 505 W class. 505 W over 2.22 m² equals about 227 W per square meter.

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

PVWatts v8 with typical-year weather gives about 846 kWh per year per 505 W panel in Los Angeles and about 927 kWh in Palmdale (20° roof, facing south, 14% system losses).

How much power does it lose on a hot roof?

With γ = −0.298 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 15.4% 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 = 43.4 V, Vmp at 74 °C cell = 28.4 V). Final design must follow the inverter manual and NEC 690.7.

Does it work with APsystems (Alt Power System) DS3-L microinverters?

Voltage check against the APsystems (Alt Power System) datasheet: Voc when cold 43.4 V vs max input 60 V; Vmp when hot 28.4 V vs MPPT low 28 V; recommended module power 265–570 W. Confirm on the microinverter maker’s compatibility list.

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).
SEG Solar — manufacturer datasheet “XXXTFHTPMBSDPN YUKON/Series )BMG$FMM/5ZQF501$PO”.
Qcells — manufacturer datasheet “Q.PEAK DUO XL-G10.d ENDURING HIGH PERFORMANCE”.
AXITEC — datasheet AXIworldbipremium bifacial 144 cells asemmbled in US.
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).