HT72-18X 550W vs HT66-210(ND)-F 705W 2 of 18 identical Swap Change panels

HT-SAAE HT72-18X 550W vs HT-SAAE HT66-210(ND)-F 705W

Q: Which panel is better: HT-SAAE HT72-18X 550W or HT-SAAE HT66-210(ND)-F 705W?

According to our database: HT-SAAE HT66-210(ND)-F 705W has higher module efficiency (22.70% vs 21.30%); HT-SAAE HT66-210(ND)-F 705W tolerates heat better (temp coeff -0.310%/°C vs -0.330%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.

Q: What is the efficiency of HT-SAAE HT72-18X 550W and HT-SAAE HT66-210(ND)-F 705W?

HT-SAAE HT72-18X 550W has a module efficiency of 21.30%, while HT-SAAE HT66-210(ND)-F 705W is 22.70%. Higher efficiency means more electricity from the same roof area - useful when space is limited.

Q: What cell technology does HT-SAAE HT72-18X 550W use vs HT-SAAE HT66-210(ND)-F 705W?

HT-SAAE HT72-18X 550W uses PERC cells; HT-SAAE HT66-210(ND)-F 705W 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 HT-SAAE HT72-18X 550W and HT-SAAE HT66-210(ND)-F 705W?

HT-SAAE HT72-18X 550W has a 25 years power warranty; HT-SAAE HT66-210(ND)-F 705W 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 HT-SAAE HT72-18X 550W and HT-SAAE HT66-210(ND)-F 705W bifacial panels?

HT-SAAE HT66-210(ND)-F 705W is bifacial (captures light from both faces); HT-SAAE HT72-18X 550W is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath.

HT-SAAE

HT72-18X 550W

550 Wp 21.30 % PERC Incomplete

Open panel page Datasheet PDF

HT-SAAE

HT66-210(ND)-F 705W

705 Wp 22.70 % TOPCon Bifacial

Open panel page Datasheet PDF

The verdict

HT66-210(ND)-F 705W leads on the differences that matter

The largest is module efficiency: 1.40 pp more efficient. 2 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.

See all 16 differences

How alike are they

2 of 18 comparable
parameters are identical

identical differs not published

What actually differs

16 of 18 parameters

Parameter HT72-18X 550W HT66-210(ND)-F 705W Difference

Module efficiency 21.30 % 22.70 % 1.40 pp more efficient

Rated power 550 Wp 705 Wp 155 W more power

Power density 212.8 Wp/m² 227.0 Wp/m² 14.1 Wp/m² higher

Performance warranty 25 yrs 30 yrs 5 yrs longer

Weight 28.5 kg 38.5 kg 10.0 kg lighter

Product warranty 25 yrs 30 yrs 5 yrs longer

Temperature coefficient -0.330 %/°C -0.310 %/°C 0.020 %/°C better in heat

Short-circuit current 14.00 A 18.41 A 4.41 A apart

Module area 2.584 m² 3.106 m² 0.522 m² apart

Cell technology PERC TOPCon PERC vs TOPCon

Weight per kWp 51.8 kg/kWp 54.6 kg/kWp 2.8 kg/kWp lighter

Current at max power 13.12 A 17.16 A 4.04 A apart

Cell count 144 132 12 cells apart

Open-circuit voltage 49.80 V 48.00 V 1.80 V apart

Bifacial No Yes No vs Yes

Dimensions 2279x1134x35 mm 2384x1303x35 mm 2279x1134x35 mm vs 2384x1303x35 mm

What it means on a roof

Thirty years of production

Declared first-year losses, with 0.40% a year afterwards assumed for both panels, at 1,200 kWh/kWp a year

Cell temperature

HT72-18X 550W

18,157 kWh

HT66-210(ND)-F 705W

23,654 kWh

Lifetime gap

5,497 kWh

Output when it is hot

Rated power carried across the range a module actually sees

Scenario HT72-18X 550W HT66-210(ND)-F 705W

Standard test conditions 25 °C 100.0% of rated power 550 W 705 W

Cool, bright day 40 °C 95.0% of rated power 523 W 672 W

Typical summer roof 55 °C 90.1% of rated power 496 W 639 W

Hot roof 70 °C 85.2% of rated power 468 W 607 W

Full specification

Parameter HT72-18X 550W HT66-210(ND)-F 705W Difference

Power and efficiency

Rated power 550 Wp 705 Wp +155 W for HT66-210(ND)-F 705W

Module efficiency 21.30 % 22.70 % +1.40 pp for HT66-210(ND)-F 705W

Power density 212.8 Wp/m² 227.0 Wp/m² +14.1 Wp/m² for HT66-210(ND)-F 705W

Open-circuit voltage 49.80 V 48.00 V 1.80 V apart

Voltage at max power 41.95 V 41.10 V Effectively the same

Short-circuit current 14.00 A 18.41 A 4.41 A apart

Current at max power 13.12 A 17.16 A 4.04 A apart

Temperature

Temperature coefficient -0.330 %/°C -0.310 %/°C +0.020 %/°C for HT66-210(ND)-F 705W

Mechanical

Dimensions 2279x1134x35 mm 2384x1303x35 mm 2279x1134x35 mm vs 2384x1303x35 mm

Module area 2.584 m² 3.106 m² 0.522 m² apart

Weight 28.5 kg 38.5 kg -10.0 kg for HT72-18X 550W

Weight per kWp 51.8 kg/kWp 54.6 kg/kWp -2.8 kg/kWp for HT72-18X 550W

Warranty and degradation

Product warranty 25 yrs 30 yrs +5 yrs for HT66-210(ND)-F 705W

Performance warranty 25 yrs 30 yrs +5 yrs for HT66-210(ND)-F 705W

Annual degradation - 0.40 %/yr Not published by HT-SAAE

Technology

Cell technology PERC TOPCon PERC vs TOPCon

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

#8,585 vs #3,364

HT66-210(ND)-F 705W leads by 5,221 places

Power density

#8,709 vs #3,418

HT66-210(ND)-F 705W leads by 5,291 places

Heat behaviour

#8,613 vs #8,069

HT66-210(ND)-F 705W leads by 544 places

Weight

#5,236 vs #9,041

HT72-18X 550W leads by 3,805 places

Warranty

#9,912 vs #21

HT66-210(ND)-F 705W leads by 9,891 places

Overall

#5,257 vs #85

HT66-210(ND)-F 705W leads by 5,172 places

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Written summary

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Questions about this pairing

Which panel is better: HT-SAAE HT72-18X 550W or HT-SAAE HT66-210(ND)-F 705W?

According to our database: HT-SAAE HT66-210(ND)-F 705 W has higher module efficiency (22.70% vs 21.30%); HT-SAAE HT66-210(ND)-F 705 W tolerates heat better (temp coeff -0.310%/°C vs -0.330%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.

What is the efficiency of HT-SAAE HT72-18X 550W and HT-SAAE HT66-210(ND)-F 705W?

HT-SAAE HT72-18X 550 W has a module efficiency of 21.30%, while HT-SAAE HT66-210(ND)-F 705 W is 22.70%. Higher efficiency means more electricity from the same roof area - useful when space is limited.

What cell technology does HT-SAAE HT72-18X 550W use vs HT-SAAE HT66-210(ND)-F 705W?

HT-SAAE HT72-18X 550 W uses PERC cells; HT-SAAE HT66-210(ND)-F 705 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 HT-SAAE HT72-18X 550W and HT-SAAE HT66-210(ND)-F 705W?

HT-SAAE HT72-18X 550 W has a 25 years power warranty; HT-SAAE HT66-210(ND)-F 705 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 HT-SAAE HT72-18X 550W and HT-SAAE HT66-210(ND)-F 705W bifacial panels?

HT-SAAE HT66-210(ND)-F 705 W is bifacial (captures light from both faces); HT-SAAE HT72-18X 550 W is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath.

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.