18X-555W vs 18X 545W 15 of 18 identical Swap Change panels

HT-SAAE HT72-18X-555W vs HT-SAAE HT72-18X 545W

Q: Which panel is better: HT-SAAE HT72-18X-555W or HT-SAAE HT72-18X 545W?

According to our database: HT-SAAE HT72-18X-555W has higher module efficiency (21.50% vs 21.10%). 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-555W and HT-SAAE HT72-18X 545W?

HT-SAAE HT72-18X-555W has a module efficiency of 21.50%, while HT-SAAE HT72-18X 545W is 21.10%. Higher efficiency means more electricity from the same roof area - useful when space is limited.

Q: What cell technology does HT-SAAE HT72-18X-555W use vs HT-SAAE HT72-18X 545W?

HT-SAAE HT72-18X-555W uses PERC cells; HT-SAAE HT72-18X 545W 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-555W and HT-SAAE HT72-18X 545W?

HT-SAAE HT72-18X-555W has a 25 years power warranty; HT-SAAE HT72-18X 545W 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-555W

555 Wp 21.50 % PERC

Open panel page Datasheet PDF

HT-SAAE

HT72-18X 545W

545 Wp 21.10 % PERC Incomplete

Open panel page Datasheet PDF

The verdict

18X-555W leads on the differences that matter

The largest is module efficiency: 0.40 pp more efficient. 15 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.

See all 3 differences

How alike are they

15 of 18 comparable
parameters are identical

identical differs not published

What actually differs

3 of 18 parameters

Parameter 18X-555W 18X 545W Difference

Module efficiency 21.50 % 21.10 % 0.40 pp more efficient

Power density 214.8 Wp/m² 210.9 Wp/m² 3.9 Wp/m² higher

Rated power 555 Wp 545 Wp 10 W more power

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-555W

18,322 kWh

18X 545W

17,992 kWh

Lifetime gap

330 kWh

Output when it is hot

Rated power carried across the range a module actually sees

Scenario 18X-555W 18X 545W

Standard test conditions 25 °C 100.0% of rated power 555 W 545 W

Cool, bright day 40 °C 95.0% of rated power 528 W 518 W

Typical summer roof 55 °C 90.1% of rated power 500 W 491 W

Hot roof 70 °C 85.2% of rated power 473 W 464 W

Full specification

Parameter 18X-555W 18X 545W Difference

Power and efficiency

Rated power 555 Wp 545 Wp +10 W for 18X-555W

Module efficiency 21.50 % 21.10 % +0.40 pp for 18X-555W

Power density 214.8 Wp/m² 210.9 Wp/m² +3.9 Wp/m² for 18X-555W

Open-circuit voltage 49.95 V 49.65 V Effectively the same

Voltage at max power 42.10 V 41.80 V Effectively the same

Short-circuit current 14.07 A 13.95 A Effectively the same

Current at max power 13.20 A 13.05 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 51.4 kg/kWp 52.3 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

#7,958 vs #9,297

18X-555W leads by 1,339 places

Power density

#8,148 vs #9,399

18X-555W leads by 1,251 places

Heat behaviour

#8,545 vs #8,545

Tied - the same position in the database

Weight

#4,712 vs #5,761

18X-555W leads by 1,049 places

Warranty

#9,798 vs #9,798

Tied - the same position in the database

Overall

#4,808 vs #5,584

18X-555W leads by 776 places

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Written summary

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Questions about this pairing

Which panel is better: HT-SAAE HT72-18X-555W or HT-SAAE HT72-18X 545W?

According to our database: HT-SAAE HT72-18X-555 W has higher module efficiency (21.50% vs 21.10%). See the full spec comparison and 30-year energy simulation above for a complete picture.

What is the efficiency of HT-SAAE HT72-18X-555W and HT-SAAE HT72-18X 545W?

HT-SAAE HT72-18X-555 W has a module efficiency of 21.50%, while HT-SAAE HT72-18X 545 W is 21.10%. Higher efficiency means more electricity from the same roof area - useful when space is limited.

What cell technology does HT-SAAE HT72-18X-555W use vs HT-SAAE HT72-18X 545W?

HT-SAAE HT72-18X-555 W uses PERC cells; HT-SAAE HT72-18X 545 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-555W and HT-SAAE HT72-18X 545W?

HT-SAAE HT72-18X-555 W has a 25 years power warranty; HT-SAAE HT72-18X 545 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.