Illustration · 132 half-cut cells

Solar panelChint New Energy

Chint New Energy CHSM66M-HC 660

Name: Chint New Energy CHSM66M-HC 660
Brand: Chint New Energy

132 half-cut cells. Power classes 645–675 W in the CEC list.

CEC listed · Aug 23, 2021UL 61730

Power class

Power (STC)660 WCEC nameplate
Efficiency≈21.9%calculated from area
%/°C Pmax−0.386CEC listing test
PTC / STC92.7%PTC 612 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
CHSM66M-HC-645	645 W	45.08	18.38	37.25	17.32	≈21.4%	597 W	Aug 23, 2021
CHSM66M-HC-650	650 W	45.28	18.43	37.45	17.36	≈21.5%	602 W	Aug 23, 2021
CHSM66M-HC-655	655 W	45.48	18.48	37.65	17.41	≈21.7%	607 W	Aug 23, 2021
CHSM66M-HC-660	660 W	45.68	18.53	37.85	17.45	≈21.9%	612 W	Aug 23, 2021
CHSM66M-HC-665	665 W	45.88	18.58	38.05	17.50	≈22.0%	616 W	Aug 23, 2021
CHSM66M-HC-670	670 W	46.08	18.63	38.23	17.54	≈22.2%	621 W	Aug 23, 2021
CHSM66M-HC-675	675 W	46.28	18.68	38.42	17.58	≈22.4%	626 W	Aug 23, 2021

≈ efficiency = Pmax ÷ CEC-listed area 3.02 m².

CEC note: Formerly Chint Solar (Zhejiang) Co., Ltd.

Build & dimensions

CEC PV Module List (Oct 7, 2026)

Module area3.02 m² (32.5 ft²)CEC-listed area
Cells132 half-cut cells
Back coverWhite backsheet

Heat & cold behaviour

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

	CEC listing test
Pmax coefficient γ	−0.386 %/°C
Voc coefficient β	−0.291 %/°C
Isc coefficient α	+0.050 %/°C
Operating cell temperature	NOCT 45.4 °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
645 W	473.1 W	34.35 V × 13.77 A	124.2 W	96%
650 W	476.8 W	34.53 V × 13.81 A	125.1 W	96%
655 W	480.7 W	34.72 V × 13.85 A	126.1 W	96%
660 W	484.4 W	34.9 V × 13.88 A	127.1 W	96%
665 W	488.3 W	35.09 V × 13.92 A	128.1 W	96%
670 W	491.8 W	35.25 V × 13.95 A	129 W	96%
675 W	495.3 W	35.43 V × 13.98 A	130 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

48.7 V

Voc when cold

per panel

29.8 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	3–12
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)

No microinverter in the reference set lists this power class in its recommended module power range.

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	1,106	12,168	6.08
Palmdale	1,835	1,211	13,322	6.69
Chula Vista	1,696	1,119	12,313	6.11
Huntington Beach	1,643	1,084	11,928	5.89
Riverside	1,696	1,119	12,313	6.21
Santa Clarita	1,724	1,138	12,516	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 Chint New Energy CHSM66M-HC 660?

Calculated from the panel area (3.02 m²): about 21.9% for the 660 W class. 660 W over 3.02 m² equals about 219 W per square meter.

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

PVWatts v8 with typical-year weather gives about 1,106 kWh per year per 660 W panel in Los Angeles and about 1,211 kWh in Palmdale (20° roof, facing south, 14% system losses).

How much power does it lose on a hot roof?

With γ = −0.386 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 20% 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 3–12 panels per string (Voc at 2 °C = 48.7 V, Vmp at 74 °C cell = 29.8 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 — 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).