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18X(N)-625W vs 18X(ND)-F 620W 16 of 19 identical Swap Change panels

HT-SAAE HT66-18X(N)-625W vs HT-SAAE HT66-18X(ND)-F 620W

HT-SAAE
HT66-18X(N)-625W
625 Wp 23.10 % TOPCon
Open panel page Datasheet PDF
VS
HT-SAAE
HT66-18X(ND)-F 620W
620 Wp 23.00 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

18X(N)-625W leads on the differences that matter

The largest is weight: 4.5 kg lighter. 16 of 19 comparable parameters are identical.

See all 3 differences
How alike are they
16 of 19 comparable
parameters are identical
identical differs
01

What actually differs

3 of 19 parameters
Parameter 18X(N)-625W 18X(ND)-F 620W Difference
Weight 29.0 kg 33.5 kg 4.5 kg lighter
Weight per kWp 46.4 kg/kWp 54.0 kg/kWp 7.6 kg/kWp lighter
Bifacial No Yes No vs Yes
02

What it means on a roof

Thirty years of production
Declared annual degradation, with a 1.0% first-year loss assumed for both panels because at least one datasheet omits it, 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.
18X(N)-625W
20,970 kWh
18X(ND)-F 620W
20,802 kWh
Lifetime gap
168 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 18X(N)-625W 18X(ND)-F 620W
Standard test conditions 25 °C 100.0% of rated power 625 W 620 W
Cool, bright day 40 °C 95.3% of rated power 596 W 591 W
Typical summer roof 55 °C 90.7% of rated power 567 W 562 W
Hot roof 70 °C 86.0% of rated power 538 W 534 W
03

Full specification

Parameter 18X(N)-625W 18X(ND)-F 620W Difference
Power and efficiency
Rated power 625 Wp 620 Wp Effectively the same
Module efficiency 23.10 % 23.00 % Effectively the same
Power density 231.4 Wp/m² 229.5 Wp/m² Effectively the same
Open-circuit voltage 48.50 V 48.30 V Effectively the same
Voltage at max power 40.40 V 40.20 V Effectively the same
Short-circuit current 16.20 A 16.15 A Effectively the same
Current at max power 15.48 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 29.0 kg 33.5 kg -4.5 kg for 18X(N)-625W
Weight per kWp 46.4 kg/kWp 54.0 kg/kWp -7.6 kg/kWp for 18X(N)-625W
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 No Yes No vs Yes
04

Against the whole database

14,129 panels
Efficiency
#1,617 vs #1,970
18X(N)-625W leads by 353 places
Power density
#1,558 vs #2,243
18X(N)-625W leads by 685 places
Heat behaviour
#8,069 vs #8,069
Tied - the same position in the database
Weight
#1,141 vs #8,326
18X(N)-625W leads by 7,185 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#399 vs #538
18X(N)-625W leads by 139 places
05

More useful comparisons

Open the full database
Same series, other bin
HT-SAAE
HT-SAAE HT66-18X(N)-625W vs HT-SAAE HT66-18X(N)-630W
One difference: module efficiency
Same series, other bin
HT-SAAE
HT-SAAE HT66-18X(N)-625W vs HT-SAAE HT66-18X(N)-620W
The same specification on paper
Same series, other bin
HT-SAAE
HT-SAAE HT66-18X(N)-625W vs HT-SAAE HT66-18X(ND)-F-620
3 differences, the largest is weight
Same series, other bin
HT-SAAE
HT-SAAE HT66-18X(N)-625W vs HT-SAAE HT66-18X(ND)-F 615W
6 differences, the largest is weight
Same series, other bin
HT-SAAE
HT-SAAE HT66-18X(N)-625W vs HT-SAAE HT66-18X(N)-615W
3 differences, the largest is module efficiency
Same series, other bin
HT-SAAE
HT-SAAE HT66-18X(N)-625W vs HT-SAAE HT66-18X(ND)-F-615
6 differences, the largest is weight
06

Written summary

07

Questions about this pairing

Which panel is better: HT-SAAE HT66-18X(N)-625W or HT-SAAE HT66-18X(ND)-F 620W?
According to our database: HT-SAAE HT66-18X(N)-625 W has higher module efficiency (23.10% vs 23.00%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of HT-SAAE HT66-18X(N)-625W and HT-SAAE HT66-18X(ND)-F 620W?
HT-SAAE HT66-18X(N)-625 W has a module efficiency of 23.10%, while HT-SAAE HT66-18X(ND)-F 620 W 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(N)-625W use vs HT-SAAE HT66-18X(ND)-F 620W?
HT-SAAE HT66-18X(N)-625 W uses TOPCon cells; HT-SAAE HT66-18X(ND)-F 620 W 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(N)-625W and HT-SAAE HT66-18X(ND)-F 620W?
HT-SAAE HT66-18X(N)-625 W has a 30 years power warranty; HT-SAAE HT66-18X(ND)-F 620 W 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(N)-625W and HT-SAAE HT66-18X(ND)-F 620W bifacial panels?
HT-SAAE HT66-18X(ND)-F 620 W is bifacial (captures light from both faces); HT-SAAE HT66-18X(N)-625 W is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath.

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.