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615 vs 620 18 of 19 identical Swap Change panels

HT-SAAE HT66-18X(ND)-F-615 vs HT-SAAE HT66-18X(ND)-F-620

HT-SAAE
HT66-18X(ND)-F-615
615 Wp 22.80 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
HT-SAAE
HT66-18X(ND)-F-620
620 Wp 23.00 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

620 leads on the differences that matter

The largest is module efficiency: 0.20 pp more efficient. 18 of 19 comparable parameters are identical.

See the one difference
How alike are they
18 of 19 comparable
parameters are identical
identical differs
01

What actually differs

1 of 19 parameters
Parameter 615 620 Difference
Module efficiency 22.80 % 23.00 % 0.20 pp more efficient
02

What it means on a roof

Thirty years of production
Each panel's own declared degradation curve, at 1,200 kWh/kWp a year
Same temp coeff. for both panels (-0.310 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
615
20,634 kWh
620
20,802 kWh
Lifetime gap
168 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 615 620
Standard test conditions 25 °C 100.0% of rated power 615 W 620 W
Cool, bright day 40 °C 95.3% of rated power 586 W 591 W
Typical summer roof 55 °C 90.7% of rated power 558 W 562 W
Hot roof 70 °C 86.0% of rated power 529 W 534 W
03

Full specification

Parameter 615 620 Difference
Power and efficiency
Rated power 615 Wp 620 Wp Effectively the same
Module efficiency 22.80 % 23.00 % +0.20 pp for 620
Power density 227.7 Wp/m² 229.5 Wp/m² Effectively the same
Open-circuit voltage 48.10 V 48.30 V Effectively the same
Voltage at max power 40.00 V 40.20 V Effectively the same
Short-circuit current 16.10 A 16.15 A Effectively the same
Current at max power 15.38 A 15.43 A Effectively the same
Temperature
Temperature coefficient -0.310 %/°C -0.310 %/°C Same
Mechanical
Dimensions 2382x1134x35 mm 2382x1134x35 mm Same
Module area 2.701 m² 2.701 m² Same
Weight 33.5 kg 33.5 kg Same
Weight per kWp 54.5 kg/kWp 54.0 kg/kWp Effectively the same
Warranty and degradation
Product warranty 30 yrs 30 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.40 %/yr 0.40 %/yr Same
Technology
Cell technology TOPCon TOPCon Same
Cell type Monocrystalline Monocrystalline Same
Cell count 132 132 Same
Bifacial Yes Yes Same
04

Against the whole database

14,129 panels
Efficiency
#2,769 vs #1,970
620 leads by 799 places
Power density
#3,132 vs #2,243
620 leads by 889 places
Heat behaviour
#8,069 vs #8,069
Tied - the same position in the database
Weight
#8,895 vs #8,326
620 leads by 569 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#720 vs #538
620 leads by 182 places
05

More useful comparisons

Open the full database
Same series, other bin
HT-SAAE
HT-SAAE HT66-18X(ND)-F-615 vs HT-SAAE HT66-18X(ND)-F 620W
One difference: module efficiency
Same series, other bin
HT-SAAE
HT-SAAE HT66-18X(ND)-F-615 vs HT-SAAE HT66-18X(ND)-F 615W
The same specification on paper
Same series, other bin
HT-SAAE
HT-SAAE HT66-18X(ND)-F-615 vs HT-SAAE HT66-18X(ND)-F 610W
One difference: module efficiency
Same series, other bin
HT-SAAE
HT-SAAE HT66-18X(ND)-F-615 vs HT-SAAE HT66-18X(ND)-F-610
One difference: module efficiency
Same series, other bin
HT-SAAE
HT-SAAE HT66-18X(ND)-F-615 vs HT-SAAE HT66-18X(ND)-F 605W
3 differences, the largest is module efficiency
Same series, other bin
HT-SAAE
HT-SAAE HT66-18X(ND)-F-615 vs HT-SAAE HT66-18X(ND)-F-605
3 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: HT-SAAE HT66-18X(ND)-F-615 or HT-SAAE HT66-18X(ND)-F-620?
According to our database: HT-SAAE HT66-18X(ND)-F-620 has higher module efficiency (23.00% vs 22.80%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of HT-SAAE HT66-18X(ND)-F-615 and HT-SAAE HT66-18X(ND)-F-620?
HT-SAAE HT66-18X(ND)-F-615 has a module efficiency of 22.80%, while HT-SAAE HT66-18X(ND)-F-620 is 23.00%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does HT-SAAE HT66-18X(ND)-F-615 use vs HT-SAAE HT66-18X(ND)-F-620?
HT-SAAE HT66-18X(ND)-F-615 uses TOPCon cells; HT-SAAE HT66-18X(ND)-F-620 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 HT66-18X(ND)-F-615 and HT-SAAE HT66-18X(ND)-F-620?
HT-SAAE HT66-18X(ND)-F-615 has a 30 years power warranty; HT-SAAE HT66-18X(ND)-F-620 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 HT66-18X(ND)-F-615 and HT-SAAE HT66-18X(ND)-F-620 bifacial panels?
Both HT-SAAE HT66-18X(ND)-F-615 and HT-SAAE HT66-18X(ND)-F-620 are bifacial - they capture reflected light from the ground, which can add 5-15% more annual energy on ground-mount or elevated rooftop installations with a light surface beneath.

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.