18X-550W vs 18X 555W 17 of 18 identical Swap Change panels

HT-SAAE HT72-18X-550W vs HT-SAAE HT72-18X 555W

Q: Which panel is better: HT-SAAE HT72-18X-550W or HT-SAAE HT72-18X 555W?

According to our database: HT-SAAE HT72-18X 555W has higher module efficiency (21.50% vs 21.30%). 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 HT72-18X 555W?

HT-SAAE HT72-18X-550W has a module efficiency of 21.30%, while HT-SAAE HT72-18X 555W is 21.50%. 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 HT72-18X 555W?

HT-SAAE HT72-18X-550W uses PERC cells; HT-SAAE HT72-18X 555W uses PERC. 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 HT72-18X 555W?

HT-SAAE HT72-18X-550W has a 25 years power warranty; HT-SAAE HT72-18X 555W has a 25 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.

HT-SAAE

HT72-18X-550W

550 Wp 21.30 % PERC

Open panel page Datasheet PDF

HT-SAAE

HT72-18X 555W

555 Wp 21.50 % PERC Incomplete

Open panel page Datasheet PDF

The verdict

18X 555W leads on the differences that matter

The largest is module efficiency: 0.20 pp more efficient. 17 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.

See the one difference

How alike are they

17 of 18 comparable
parameters are identical

identical differs not published

What actually differs

1 of 18 parameters

Parameter 18X-550W 18X 555W Difference

Module efficiency 21.30 % 21.50 % 0.20 pp more efficient

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

Same temp coeff. for both panels (-0.330 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.

18X-550W

18,157 kWh

18X 555W

18,322 kWh

Lifetime gap

165 kWh

Output when it is hot

Rated power carried across the range a module actually sees

Scenario 18X-550W 18X 555W

Standard test conditions 25 °C 100.0% of rated power 550 W 555 W

Cool, bright day 40 °C 95.0% of rated power 523 W 528 W

Typical summer roof 55 °C 90.1% of rated power 496 W 500 W

Hot roof 70 °C 85.2% of rated power 468 W 473 W

Full specification

Parameter 18X-550W 18X 555W Difference

Power and efficiency

Rated power 550 Wp 555 Wp Effectively the same

Module efficiency 21.30 % 21.50 % +0.20 pp for 18X 555W

Power density 212.8 Wp/m² 214.8 Wp/m² Effectively the same

Open-circuit voltage 49.80 V 49.95 V Effectively the same

Voltage at max power 41.95 V 42.10 V Effectively the same

Short-circuit current 14.00 A 14.07 A Effectively the same

Current at max power 13.12 A 13.20 A Effectively the same

Temperature

Temperature coefficient -0.330 %/°C -0.330 %/°C Same

Mechanical

Dimensions 2279x1134x35 mm 2279x1134x35 mm Same

Module area 2.584 m² 2.584 m² Same

Weight 28.5 kg 28.5 kg Same

Weight per kWp 51.8 kg/kWp 51.4 kg/kWp Effectively the same

Warranty and degradation

Product warranty 25 yrs 25 yrs Same

Performance warranty 25 yrs 25 yrs Same

Annual degradation 0.60 %/yr - Not published by HT-SAAE

Technology

Cell technology PERC PERC Same

Cell type Monocrystalline Monocrystalline Same

Cell count 144 144 Same

Bifacial No No Same

Against the whole database

14,005 panels

Efficiency

#8,519 vs #7,958

18X 555W leads by 561 places

Power density

#8,643 vs #8,148

18X 555W leads by 495 places

Heat behaviour

#8,545 vs #8,545

Tied - the same position in the database

Weight

#5,204 vs #4,712

18X 555W leads by 492 places

Warranty

#9,798 vs #9,798

Tied - the same position in the database

Overall

#5,197 vs #4,808

18X 555W leads by 389 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 HT72-18X 555W?

According to our database: HT-SAAE HT72-18X 555 W has higher module efficiency (21.50% vs 21.30%). 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 HT72-18X 555W?

HT-SAAE HT72-18X-550 W has a module efficiency of 21.30%, while HT-SAAE HT72-18X 555 W is 21.50%. 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 HT72-18X 555W?

HT-SAAE HT72-18X-550 W uses PERC cells; HT-SAAE HT72-18X 555 W uses PERC. 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 HT72-18X 555W?

HT-SAAE HT72-18X-550 W has a 25 years power warranty; HT-SAAE HT72-18X 555 W has a 25 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.

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.