Illustration · 132 cells

Solar panelHanersun

Hanersun HN21-66HT650W

Name: Hanersun HN21-66HT650W
Brand: Hanersun

132 cells, bifacial. Power classes 635–670 W in the CEC list.

CEC listed · Jun 23, 2025UL 61730Bifacial

Power class

Power (STC)650 WCEC nameplate
Efficiency≈21.5%calculated from area
%/°C Pmax−0.323CEC listing test
PTC / STC94.4%PTC 614 W (CEC)

Power classes

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation · 8 models

Model	Pmax	Voc, V	Isc, A	Vmp, V	Imp, A	Efficiency	PTC	CEC listed
HN21-66HT635W	635 W	44.40	18.27	37.30	17.03	≈21.0%	599 W	Jun 23, 2025
HN21-66HT640W	640 W	44.60	18.31	37.50	17.07	≈21.1%	604 W	Jun 23, 2025
HN21-66HT645W	645 W	44.80	18.35	37.70	17.11	≈21.3%	609 W	Jun 23, 2025
HN21-66HT650W	650 W	45.00	18.39	37.90	17.16	≈21.5%	614 W	Jun 23, 2025
HN21-66HT655W	655 W	45.20	18.43	38.10	17.20	≈21.6%	619 W	Jun 23, 2025
HN21-66HT660W	660 W	45.40	18.47	38.30	17.24	≈21.8%	624 W	Jun 23, 2025
HN21-66HT665W	665 W	45.60	18.51	38.50	17.28	≈21.9%	628 W	Jun 23, 2025
HN21-66HT670W	670 W	45.80	18.55	38.70	17.32	≈22.1%	633 W	Jun 23, 2025

≈ efficiency = Pmax ÷ CEC-listed area 3.03 m².

Heat & cold behaviour

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

	CEC listing test
Pmax coefficient γ	−0.323 %/°C
Voc coefficient β	−0.252 %/°C
Isc coefficient α	+0.046 %/°C
Operating cell temperature	NOCT 43.3 °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
635 W	500.4 W	36.71 V × 13.63 A	126.8 W	100%
640 W	504.1 W	36.9 V × 13.66 A	127.8 W	100%
645 W	507.8 W	37.09 V × 13.69 A	128.7 W	100%
650 W	511.6 W	37.27 V × 13.73 A	129.7 W	100%
655 W	515.1 W	37.46 V × 13.75 A	130.6 W	100%
660 W	518.8 W	37.65 V × 13.78 A	131.5 W	100%
665 W	522.6 W	37.84 V × 13.81 A	132.5 W	100%
670 W	526.4 W	38.02 V × 13.84 A	133.4 W	100%

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

PVEL Scorecards

Hanersun named Top Performer, 2024–2025

This exact series is not listed in published PVEL Top Performer tables. Results below are for the manufacturer.

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

47.6 V

Voc when cold

per panel

31 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	2–12
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	1,089	11,983	6.08
Palmdale	1,835	1,193	13,120	6.69
Chula Vista	1,696	1,102	12,126	6.11
Huntington Beach	1,643	1,068	11,747	5.89
Riverside	1,696	1,102	12,126	6.21
Santa Clarita	1,724	1,121	12,327	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 650 W panels

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

Panel	Pmax	Efficiency	γ Pmax (CEC)	Voc, V	Isc, A	PVEL (product / brand)
Hanersun HN21-66HT650W	650 W	≈21.5%	−0.323	45	18.39	brand 2×
Canadian Solar CS7N-650MB-AG	650 W	≈21.2%	−0.390	45	18.39	product 2024
Hyundai Energy Solutions HiN-T650NJ	650 W	≈23.5%	−0.273	56.7	14.51	brand 5× (2017–2025)
Waaree BiN-02-645	645 W	≥22.8%	−0.295	43.98	18.39	brand 5× (2022–2026)

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 Hanersun HN21-66HT650W?

Calculated from the panel area (3.03 m²): about 21.5% for the 650 W class. 650 W over 3.03 m² equals about 215 W per square meter.

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

PVWatts v8 with typical-year weather gives about 1,089 kWh per year per 650 W panel in Los Angeles and about 1,193 kWh in Palmdale (20° roof, facing south, 14% system losses).

How much power does it lose on a hot roof?

With γ = −0.323 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 16.7% 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 2–12 panels per string (Voc at 2 °C = 47.6 V, Vmp at 74 °C cell = 31 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.

Has this panel been reliability-tested?

This exact series is not in published PVEL Top Performer tables; Hanersun was named a Top Performer in 2 Scorecards (2024–2025).

Sources

California Energy Commission — Solar Equipment Lists, PV Module List, Inverter List (snapshot Oct 7, 2026).
Hyundai Energy Solutions — datasheet [US] NJ(HiN) Series (N TOPCon Bifacial) 640~645W.
Waaree — datasheet ELITE SERIES BiN-02.
Kiwa PVEL — PV Module Reliability Scorecard, Top Performer lists 2024–2025.
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 — 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).