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555W vs 540W 15 of 18 identical Swap Change panels

HT-SAAE HT72-18X 555W vs HT-SAAE HT72-18X 540W

HT-SAAE
HT72-18X 555W
555 Wp 21.50 % PERC Incomplete
Open panel page Datasheet PDF
VS
HT-SAAE
HT72-18X 540W
540 Wp 20.90 % PERC Incomplete
Open panel page Datasheet PDF
The verdict

555W leads on the differences that matter

The largest is module efficiency: 0.60 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 555W 540W Difference
Module efficiency 21.50 % 20.90 % 0.60 pp more efficient
Power density 214.8 Wp/m² 208.9 Wp/m² 5.8 Wp/m² higher
Rated power 555 Wp 540 Wp 15 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.
555W
18,322 kWh
540W
17,826 kWh
Lifetime gap
496 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 555W 540W
Standard test conditions 25 °C 100.0% of rated power 555 W 540 W
Cool, bright day 40 °C 95.0% of rated power 528 W 513 W
Typical summer roof 55 °C 90.1% of rated power 500 W 487 W
Hot roof 70 °C 85.2% of rated power 473 W 460 W
03

Full specification

Parameter 555W 540W Difference
Power and efficiency
Rated power 555 Wp 540 Wp +15 W for 555W
Module efficiency 21.50 % 20.90 % +0.60 pp for 555W
Power density 214.8 Wp/m² 208.9 Wp/m² +5.8 Wp/m² for 555W
Open-circuit voltage 49.95 V 49.50 V Effectively the same
Voltage at max power 42.10 V 41.65 V Effectively the same
Short-circuit current 14.07 A 13.90 A Effectively the same
Current at max power 13.20 A 12.97 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 52.8 kg/kWp Effectively the same
Warranty and degradation
Product warranty 25 yrs 25 yrs Same
Performance warranty 25 yrs 25 yrs Same
Annual degradation - - Neither datasheet publishes this
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

14,129 panels
Efficiency
#8,022 vs #10,148
555W leads by 2,126 places
Power density
#8,213 vs #10,278
555W leads by 2,065 places
Heat behaviour
#8,613 vs #8,613
Tied - the same position in the database
Weight
#4,736 vs #6,505
555W leads by 1,769 places
Warranty
#9,912 vs #9,912
Tied - the same position in the database
Overall
#4,868 vs #6,034
555W leads by 1,166 places
05

More useful comparisons

Open the full database
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HT-SAAE HT72-18X 555W vs HT-SAAE HT72-18X 560W
One difference: module efficiency
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HT-SAAE HT72-18X 555W vs HT-SAAE HT72-18X 550W
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HT-SAAE HT72-18X 555W vs HT-SAAE HT66-210(ND)-F 710W
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HT-SAAE HT72-18X 555W vs HT-SAAE HT66-210(ND)-F 705W
17 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: HT-SAAE HT72-18X 555W or HT-SAAE HT72-18X 540W?
According to our database: HT-SAAE HT72-18X 555 W has higher module efficiency (21.50% vs 20.90%). 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 540W?
HT-SAAE HT72-18X 555 W has a module efficiency of 21.50%, while HT-SAAE HT72-18X 540 W is 20.90%. 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 540W?
HT-SAAE HT72-18X 555 W uses PERC cells; HT-SAAE HT72-18X 540 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 540W?
HT-SAAE HT72-18X 555 W has a 25 years power warranty; HT-SAAE HT72-18X 540 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.