Illustration · 120 half-cut cells

Solar panelELITE Solar

ELITE Solar ET-M660BH355BB

Name: ELITE Solar ET-M660BH355BB
Brand: ELITE Solar

120 half-cut cells. Power classes 345–370 W in the CEC list.

CEC listed · Nov 1, 2021UL 61730PVEL Top Performer 2021, 2022

Power class

Power (STC)355 WCEC nameplate
Efficiency≈19.7%calculated from area
%/°C Pmax−0.360CEC listing test
PTC / STC93.5%PTC 332 W (CEC)

Power classes

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation · 6 models

Model	Pmax	Voc, V	Isc, A	Vmp, V	Imp, A	Efficiency	PTC	CEC listed
ET-M660BH345BB	345 W	39.90	11.05	33.40	10.34	≈19.2%	322 W	Nov 1, 2021
ET-M660BH350BB	350 W	40.10	11.15	33.60	10.42	≈19.4%	327 W	Nov 1, 2021
ET-M660BH355BB	355 W	40.30	11.25	33.80	10.51	≈19.7%	332 W	Nov 1, 2021
ET-M660BH360BB	360 W	40.50	11.35	34.00	10.59	≈20.0%	337 W	Nov 1, 2021
ET-M660BH365BB	365 W	40.70	11.43	34.20	10.68	≈20.3%	342 W	Nov 1, 2021
ET-M660BH370BB	370 W	40.90	11.52	34.40	10.76	≈20.6%	346 W	Nov 1, 2021

≈ efficiency = Pmax ÷ CEC-listed area 1.8 m².

Build & dimensions

CEC PV Module List (Oct 7, 2026)

Module area1.8 m² (19.4 ft²)CEC-listed area
Cells120 half-cut cells
Back coverBlack backsheet
FrameBlack frame

Heat & cold behaviour

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

	CEC listing test
Pmax coefficient γ	−0.360 %/°C
Voc coefficient β	−0.263 %/°C
Isc coefficient α	+0.048 %/°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
345 W	254.3 W	30.78 V × 8.26 A	65.9 W	95%
350 W	257.8 W	30.97 V × 8.32 A	66.8 W	95%
355 W	261.6 W	31.15 V × 8.4 A	67.8 W	95%
360 W	265.1 W	31.34 V × 8.46 A	68.7 W	95%
365 W	268.9 W	31.52 V × 8.53 A	69.7 W	95%
370 W	272.5 W	31.7 V × 8.6 A	70.6 W	95%

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

Independent reliability testing

Kiwa PVEL Scorecard

2021, 2022

PVEL Top Performer

this series

Tests passed as Top Performer

LID+LETID, TC

PVEL Scorecards

ELITE Solar named Top Performer, 2021–2026

PVEL Top Performer tests

Year	Product	Tests
2021	ET-M660BHxxxBB	LID+LETID
2022	ET-M660BHxxxBB	LID+LETIDTC

Tested bill of materials

Cell technology (tested BOM)n-type TOPCon
Module design (tested BOM)Monofacial - glass//backsheet
Power class range tested305-350W

Details describe the tested sample, not every module of the series.

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

42.7 V

Voc when cold

per panel

27 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	3–14
Solis (Ginlong) S6-EH1P10K-H-US	600 V	80–520 V	datasheet	3–14
Solis (Ginlong) Solis-1P7.6K-4G-US	600 V	100–500 V	datasheet	4–14
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	42.7 / 27 V	⚠ Works; below MPPT at peak heat	1.22
Enphase IQ8X-80-M-US	320–540 W	79.5 V	43–60 V	42.7 / 27 V	✗ Not a match: module voltage below MPPT range	0.93
APsystems (Alt Power System) DS3-L	265–570 W	60 V	28–45 V	42.7 / 27 V	⚠ Works; below MPPT at peak heat	0.46
Enphase IQ8M-72-2-US	260–460 W	60 V	30–45 V	42.7 / 27 V	⚠ Works; below MPPT at peak heat	1.09
Enphase IQ8A-72-2-US	295–500 W	60 V	32–45 V	42.7 / 27 V	⚠ Works; below MPPT at peak heat	1.02

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	595	11,900	6.08
Palmdale	1,835	651	13,028	6.69
Chula Vista	1,696	602	12,042	6.11
Huntington Beach	1,643	583	11,665	5.89
Riverside	1,696	602	12,042	6.21
Santa Clarita	1,724	612	12,240	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 355 W panels

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

Panel	Pmax	Efficiency	γ Pmax (CEC)	Voc, V	Isc, A	PVEL (product / brand)	SoCal permits (series)
ELITE Solar ET-M660BH355BB	355 W	≈19.7%	−0.360	40.3	11.25	product 2021, 2022	—
LONGi LR4-60HPB-355M	355 W	≈20.1%	−0.339	40.6	11.25	product 2021, 2022	193
REC Group REC355AA	355 W	≈21.1%	−0.279	44	10.19	brand 9× (2016–2025)	30
Trina Solar TSM-355DE06X.05(II)	355 W	≈19.5%	−0.339	44.6	10.24	product 2022	23

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 ELITE Solar ET-M660BH355BB?

Calculated from the panel area (1.8 m²): about 19.7% for the 355 W class. 355 W over 1.8 m² equals about 197 W per square meter.

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

PVWatts v8 with typical-year weather gives about 595 kWh per year per 355 W panel in Los Angeles and about 651 kWh in Palmdale (20° roof, facing south, 14% system losses).

How much power does it lose on a hot roof?

With γ = −0.360 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 18.7% 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 3–14 panels per string (Voc at 2 °C = 42.7 V, Vmp at 74 °C cell = 27 V). Final design must follow the inverter manual and NEC 690.7.

Has this panel been reliability-tested?

ET-M660BHxxxBB was a PVEL Top Performer in 2021, 2022 (LID+LETID, TC).

Sources

California Energy Commission — Solar Equipment Lists, PV Module List, Inverter List (snapshot Oct 7, 2026).
Kiwa PVEL — PV Module Reliability Scorecard, Top Performer lists 2021–2026.
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 — 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).