HN18-72H580W vs HN21N-66HT740W 4 of 19 identical Swap Change panels

Hanersun HN18-72H580W vs Hanersun HN21N-66HT740W

Q: Which panel is better: Hanersun HN18-72H580W or Hanersun HN21N-66HT740W?

According to our database: Hanersun HN21N-66HT740W has higher module efficiency (23.80% vs 22.45%); Hanersun HN21N-66HT740W tolerates heat better (temp coeff -0.280%/°C vs -0.310%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.

Q: What is the efficiency of Hanersun HN18-72H580W and Hanersun HN21N-66HT740W?

Hanersun HN18-72H580W has a module efficiency of 22.45%, while Hanersun HN21N-66HT740W is 23.80%. Higher efficiency means more electricity from the same roof area - useful when space is limited.

Q: What cell technology does Hanersun HN18-72H580W use vs Hanersun HN21N-66HT740W?

Hanersun HN18-72H580W uses TOPCon cells; Hanersun HN21N-66HT740W uses TOPCon. Modern n-type technologies (TOPCon, HJT, BC) typically deliver higher efficiency and lower degradation compared to older PERC (p-type) cells.

Q: What is the warranty on Hanersun HN18-72H580W and Hanersun HN21N-66HT740W?

Hanersun HN18-72H580W has a 25 years power warranty; Hanersun HN21N-66HT740W has a 30 years power warranty. The power warranty guarantees a minimum percentage of rated output at the end of the warranty period (typically 80-87%). Product (materials) warranties are usually shorter.

Q: Are Hanersun HN18-72H580W and Hanersun HN21N-66HT740W bifacial panels?

Hanersun HN21N-66HT740W is bifacial (captures light from both faces); Hanersun HN18-72H580W is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath.

Hanersun

HN18-72H580W

580 Wp 22.45 % TOPCon

Open panel page Datasheet PDF

Hanersun

HN21N-66HT740W

740 Wp 23.80 % TOPCon Bifacial

Open panel page Datasheet PDF

The verdict

HN21N-66HT740W leads on the differences that matter

The largest is module efficiency: 1.35 pp more efficient. 4 of 19 comparable parameters are identical.

See all 15 differences

How alike are they

4 of 19 comparable
parameters are identical

identical differs

What actually differs

15 of 19 parameters

Parameter HN18-72H580W HN21N-66HT740W Difference

Module efficiency 22.45 % 23.80 % 1.35 pp more efficient

Rated power 580 Wp 740 Wp 160 W more power

Power density 224.5 Wp/m² 238.2 Wp/m² 13.7 Wp/m² higher

Performance warranty 25 yrs 30 yrs 5 yrs longer

Temperature coefficient -0.310 %/°C -0.280 %/°C 0.030 %/°C better in heat

Weight 28.5 kg 37.4 kg 8.9 kg lighter

Product warranty 12 yrs 15 yrs 3 yrs longer

Short-circuit current 14.23 A 18.66 A 4.43 A apart

Module area 2.583 m² 3.106 m² 0.523 m² apart

Current at max power 13.43 A 17.66 A 4.23 A apart

Cell count 144 132 12 cells apart

Open-circuit voltage 51.40 V 49.80 V 1.60 V apart

Bifacial No Yes No vs Yes

Dimensions 2278x1134x30 mm 2384x1303x33 mm 2278x1134x30 mm vs 2384x1303x33 mm

Voltage at max power 43.20 V 41.92 V 1.28 V apart

What it means on a roof

Thirty years of production

Each panel's own declared degradation curve, at 1,200 kWh/kWp a year

Cell temperature

HN18-72H580W

19,460 kWh

HN21N-66HT740W

24,828 kWh

Lifetime gap

5,368 kWh

Output when it is hot

Rated power carried across the range a module actually sees

Scenario HN18-72H580W HN21N-66HT740W

Standard test conditions 25 °C 100.0% of rated power 580 W 740 W

Cool, bright day 40 °C 95.3% of rated power 553 W 709 W

Typical summer roof 55 °C 90.7% of rated power 526 W 678 W

Hot roof 70 °C 86.0% of rated power 499 W 647 W

Full specification

Parameter HN18-72H580W HN21N-66HT740W Difference

Power and efficiency

Rated power 580 Wp 740 Wp +160 W for HN21N-66HT740W

Module efficiency 22.45 % 23.80 % +1.35 pp for HN21N-66HT740W

Power density 224.5 Wp/m² 238.2 Wp/m² +13.7 Wp/m² for HN21N-66HT740W

Open-circuit voltage 51.40 V 49.80 V 1.60 V apart

Voltage at max power 43.20 V 41.92 V 1.28 V apart

Short-circuit current 14.23 A 18.66 A 4.43 A apart

Current at max power 13.43 A 17.66 A 4.23 A apart

Temperature

Temperature coefficient -0.310 %/°C -0.280 %/°C +0.030 %/°C for HN21N-66HT740W

Mechanical

Dimensions 2278x1134x30 mm 2384x1303x33 mm 2278x1134x30 mm vs 2384x1303x33 mm

Module area 2.583 m² 3.106 m² 0.523 m² apart

Weight 28.5 kg 37.4 kg -8.9 kg for HN18-72H580W

Weight per kWp 49.1 kg/kWp 50.5 kg/kWp Effectively the same

Warranty and degradation

Product warranty 12 yrs 15 yrs +3 yrs for HN21N-66HT740W

Performance warranty 25 yrs 30 yrs +5 yrs for HN21N-66HT740W

Annual degradation 0.40 %/yr 0.40 %/yr Same

Technology

Cell technology TOPCon TOPCon Same

Cell type Monocrystalline Monocrystalline Same

Cell count 144 132 12 cells apart

Bifacial No Yes No vs Yes

Against the whole database

14,129 panels

Efficiency

#4,680 vs #462

HN21N-66HT740W leads by 4,218 places

Power density

#4,607 vs #460

HN21N-66HT740W leads by 4,147 places

Heat behaviour

#8,069 vs #1,347

HN21N-66HT740W leads by 6,722 places

Weight

#2,773 vs #3,944

HN18-72H580W leads by 1,171 places

Warranty

#9,912 vs #21

HN21N-66HT740W leads by 9,891 places

Overall

#5,534 vs #130

HN21N-66HT740W leads by 5,404 places

More useful comparisons

Open the full database

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The same specification on paper

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Written summary

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Questions about this pairing

Which panel is better: Hanersun HN18-72H580W or Hanersun HN21N-66HT740W?

According to our database: Hanersun HN21N-66HT740 W has higher module efficiency (23.80% vs 22.45%); Hanersun HN21N-66HT740 W tolerates heat better (temp coeff -0.280%/°C vs -0.310%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.

What is the efficiency of Hanersun HN18-72H580W and Hanersun HN21N-66HT740W?

Hanersun HN18-72H580 W has a module efficiency of 22.45%, while Hanersun HN21N-66HT740 W is 23.80%. Higher efficiency means more electricity from the same roof area - useful when space is limited.

What cell technology does Hanersun HN18-72H580W use vs Hanersun HN21N-66HT740W?

Hanersun HN18-72H580 W uses TOPCon cells; Hanersun HN21N-66HT740 W uses TOPCon. Modern n-type technologies (TOPCon, HJT, BC) typically deliver higher efficiency and lower degradation compared to older PERC (p-type) cells.

What is the warranty on Hanersun HN18-72H580W and Hanersun HN21N-66HT740W?

Hanersun HN18-72H580 W has a 25 years power warranty; Hanersun HN21N-66HT740 W has a 30 years power warranty. The power warranty guarantees a minimum percentage of rated output at the end of the warranty period (typically 80-87%). Product (materials) warranties are usually shorter.

Are Hanersun HN18-72H580W and Hanersun HN21N-66HT740W bifacial panels?

Hanersun HN21N-66HT740 W is bifacial (captures light from both faces); Hanersun HN18-72H580 W is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath.

Shop prices: See 14 Hanersun offers

Every figure here is from the manufacturers' own datasheets - a dash means the value is not published, never an estimate. The thirty-year projection and the temperature scenarios are calculations from those figures, and each states its assumption above.