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

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

HT-SAAE
HT72-18X 545W
545 Wp 21.10 % PERC Incomplete
Open panel page Datasheet PDF
VS
HT-SAAE
HT72-18X-555W
555 Wp 21.50 % PERC
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
01

What actually differs

3 of 18 parameters
Parameter 18X 545W 18X-555W Difference
Module efficiency 21.10 % 21.50 % 0.40 pp more efficient
Power density 210.9 Wp/m² 214.8 Wp/m² 3.9 Wp/m² higher
Rated power 545 Wp 555 Wp 10 W more power
02

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
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 545W
17,992 kWh
18X-555W
18,322 kWh
Lifetime gap
330 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 18X 545W 18X-555W
Standard test conditions 25 °C 100.0% of rated power 545 W 555 W
Cool, bright day 40 °C 95.0% of rated power 518 W 528 W
Typical summer roof 55 °C 90.1% of rated power 491 W 500 W
Hot roof 70 °C 85.2% of rated power 464 W 473 W
03

Full specification

Parameter 18X 545W 18X-555W Difference
Power and efficiency
Rated power 545 Wp 555 Wp +10 W for 18X-555W
Module efficiency 21.10 % 21.50 % +0.40 pp for 18X-555W
Power density 210.9 Wp/m² 214.8 Wp/m² +3.9 Wp/m² for 18X-555W
Open-circuit voltage 49.65 V 49.95 V Effectively the same
Voltage at max power 41.80 V 42.10 V Effectively the same
Short-circuit current 13.95 A 14.07 A Effectively the same
Current at max power 13.05 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 52.3 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
04

Against the whole database

14,005 panels
Efficiency
#9,297 vs #7,958
18X-555W leads by 1,339 places
Power density
#9,399 vs #8,148
18X-555W leads by 1,251 places
Heat behaviour
#8,545 vs #8,545
Tied - the same position in the database
Weight
#5,761 vs #4,712
18X-555W leads by 1,049 places
Warranty
#9,798 vs #9,798
Tied - the same position in the database
Overall
#5,584 vs #4,808
18X-555W leads by 776 places
05

More useful comparisons

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HT-SAAE HT72-18X 545W vs HT-SAAE HT72-18X 555W
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HT-SAAE HT72-18X-555W vs HT-SAAE HT72-18X-550W
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06

Written summary

07

Questions about this pairing

Which panel is better: HT-SAAE HT72-18X 545W or HT-SAAE HT72-18X-555W?
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 545W and HT-SAAE HT72-18X-555W?
HT-SAAE HT72-18X 545 W has a module efficiency of 21.10%, 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 545W use vs HT-SAAE HT72-18X-555W?
HT-SAAE HT72-18X 545 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 545W and HT-SAAE HT72-18X-555W?
HT-SAAE HT72-18X 545 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.