Illustration · 132 cells

Solar panelHanersun

Hanersun HN21N-66HT685W

Name: Hanersun HN21N-66HT685W
Brand: Hanersun

132 cells, bifacial. Power classes 670–705 W in the CEC list.

CEC listed · Jan 2, 2025UL 61730BifacialPVEL Top Performer 2025

Power class

Power (STC)685 WCEC nameplate
Efficiency≈22.6%calculated from area
%/°C Pmax−0.296CEC listing test
PTC / STC95.1%PTC 651 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
HN21N-66HT670W	670 W	47.00	18.10	39.20	17.10	≈22.1%	637 W	Jan 2, 2025
HN21N-66HT675W	675 W	47.20	18.14	39.40	17.14	≈22.3%	642 W	Jan 2, 2025
HN21N-66HT680W	680 W	47.40	18.18	39.60	17.18	≈22.4%	646 W	Jan 2, 2025
HN21N-66HT685W	685 W	47.60	18.22	39.80	17.22	≈22.6%	651 W	Jan 2, 2025
HN21N-66HT690W	690 W	47.80	18.26	40.00	17.25	≈22.8%	656 W	Jan 2, 2025
HN21N-66HT695W	695 W	48.00	18.30	40.20	17.29	≈22.9%	661 W	Jan 2, 2025
HN21N-66HT700W	700 W	48.20	18.34	40.40	17.33	≈23.1%	666 W	Jan 2, 2025
HN21N-66HT705W	705 W	48.40	18.38	40.60	17.37	≈23.3%	671 W	Jan 2, 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	−0.296 %/°C
Voc coefficient β	−0.284 %/°C
Isc coefficient α	+0.041 %/°C
Operating cell temperature	NOCT 43.1 °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
670 W	500.4 W	36.71 V × 13.63 A	126.8 W	95%
675 W	504.1 W	36.9 V × 13.66 A	127.8 W	95%
680 W	507.8 W	37.09 V × 13.69 A	128.7 W	95%
685 W	511.6 W	37.27 V × 13.73 A	129.7 W	95%
690 W	515.1 W	37.46 V × 13.75 A	130.6 W	95%
695 W	518.8 W	37.65 V × 13.78 A	131.5 W	95%
700 W	522.6 W	37.84 V × 13.81 A	132.5 W	95%
705 W	526.4 W	38.02 V × 13.84 A	133.4 W	95%

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

Certifications

CEC PV Module List (Oct 7, 2026) · Clean Energy Council (Australia)

UL 61730IEC 61215:2021 / IEC 61730:2023

UL 61730CEC listing
IEC 61215:2021 / IEC 61730:2023TÜV SÜD Product Service GmbH, valid to Oct 2027

Independent reliability testing

Kiwa PVEL Scorecard

2024, 2025

PVEL Top Performer

this series

Tests passed as Top Performer

DH, HSS, LID+LETID, MSS

PVEL Scorecards

Hanersun named Top Performer, 2024–2025

PVEL Top Performer tests

Year	Product	Tests
2025	HN21N-66HTxxxW	DHHSSLID+LETIDMSS
2024	HN21N-66HT (closely related product name)	HSSLID+LETIDMSS
2024	HN21N-66H (closely related product name)	LID+LETID

Tested bill of materials

PVEL-tested factoryChina
Cell technology (tested BOM)n-type TOPCon
Module design (tested BOM)bifacial - 2.0 glass//2.0 glass
Power class range tested680-725W
Hail test ice ball40 mm

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

50.7 V

Voc when cold

per panel

33.2 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	2–11
Solis (Ginlong) S6-EH1P10K-H-US	600 V	80–520 V	datasheet	3–11
Solis (Ginlong) Solis-1P7.6K-4G-US	600 V	100–500 V	datasheet	4–11
Qcells Q.VOLT H7.6SX	498 V	234–498 V	CEC test window	8–9

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	1,148	11,481	6.08
Palmdale	1,835	1,257	12,570	6.69
Chula Vista	1,696	1,162	11,618	6.11
Huntington Beach	1,643	1,125	11,255	5.89
Riverside	1,696	1,162	11,618	6.21
Santa Clarita	1,724	1,181	11,809	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 685 W panels

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

Panel	Pmax	Efficiency	γ Pmax (CEC)	Voc, V	Isc, A	PVEL (product / brand)
Hanersun HN21N-66HT685W	685 W	≈22.6%	−0.296	47.6	18.22	product 2025
Canadian Solar CS7N-685TB-AG	685 W	≈22.1%	−0.285	47.3	18.34	product 2024
Waaree BiN-03-685	685 W	≥22.1%	−0.302	47.7	18.2	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 HN21N-66HT685W?

Calculated from the panel area (3.03 m²): about 22.6% for the 685 W class. 685 W over 3.03 m² equals about 226 W per square meter.

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

PVWatts v8 with typical-year weather gives about 1,148 kWh per year per 685 W panel in Los Angeles and about 1,257 kWh in Palmdale (20° roof, facing south, 14% system losses).

How much power does it lose on a hot roof?

With γ = −0.296 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 15.3% 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 2–11 panels per string (Voc at 2 °C = 50.7 V, Vmp at 74 °C cell = 33.2 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?

HN21N-66HTxxxW was a PVEL Top Performer in 2025 (DH, HSS, LID+LETID, MSS).

Sources

California Energy Commission — Solar Equipment Lists, PV Module List, Inverter List (snapshot Oct 7, 2026).
Canadian Solar — datasheet New N-type Bifacial Module TOPBiHiKu7 CS7N-725|730|735|740|745|750TB-AG.
Waaree — datasheet ELITE SERIES BiN-03.
Kiwa PVEL — PV Module Reliability Scorecard, Top Performer lists 2024–2025.
NLR (formerly NREL) — System Advisor Model CEC inverter library (version 2026.7.3).
Clean Energy Council (Australia) — Approved PV modules list (as of Oct 8, 2026).
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).