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635BNDG vs 640BNDG 18 of 19 identical Swap Change panels

Ulica Solar TSM156-9-635BNDG vs Ulica Solar TSM156-9-640BNDG

Ulica Solar
TSM156-9-635BNDG
635 Wp 22.70 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
Ulica Solar
TSM156-9-640BNDG
640 Wp 22.90 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

640BNDG 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 635BNDG 640BNDG Difference
Module efficiency 22.70 % 22.90 % 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 (-0.290 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
635BNDG
21,306 kWh
640BNDG
21,473 kWh
Lifetime gap
167 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 635BNDG 640BNDG
Standard test conditions 25 °C 100.0% of rated power 635 W 640 W
Cool, bright day 40 °C 95.7% of rated power 607 W 612 W
Typical summer roof 55 °C 91.3% of rated power 580 W 584 W
Hot roof 70 °C 87.0% of rated power 552 W 556 W
03

Full specification

Parameter 635BNDG 640BNDG Difference
Power and efficiency
Rated power 635 Wp 640 Wp Effectively the same
Module efficiency 22.70 % 22.90 % +0.20 pp for 640BNDG
Power density 227.2 Wp/m² 229.0 Wp/m² Effectively the same
Open-circuit voltage 56.40 V 56.60 V Effectively the same
Voltage at max power 47.15 V 47.31 V Effectively the same
Short-circuit current 14.33 A 14.38 A Effectively the same
Current at max power 13.48 A 13.54 A Effectively the same
Temperature
Temperature coefficient -0.290 %/°C -0.290 %/°C Same
Mechanical
Dimensions 2465x1134x30 mm 2465x1134x30 mm Same
Module area 2.795 m² 2.795 m² Same
Weight 33.5 kg 33.5 kg Same
Weight per kWp 52.8 kg/kWp 52.3 kg/kWp Effectively the same
Warranty and degradation
Product warranty 5 yrs 5 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 156 156 Same
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#3,307 vs #2,359
640BNDG leads by 948 places
Power density
#3,252 vs #2,389
640BNDG leads by 863 places
Heat behaviour
#2,165 vs #2,165
Tied - the same position in the database
Weight
#6,429 vs #5,829
640BNDG leads by 600 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#3,758 vs #3,338
640BNDG leads by 420 places
05

More useful comparisons

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06

Written summary

07

Questions about this pairing

Which panel is better: Ulica Solar TSM156-9-635BNDG or Ulica Solar TSM156-9-640BNDG?
According to our database: Ulica Solar TSM156-9-640BNDG has higher module efficiency (22.90% vs 22.70%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Ulica Solar TSM156-9-635BNDG and Ulica Solar TSM156-9-640BNDG?
Ulica Solar TSM156-9-635BNDG has a module efficiency of 22.70%, while Ulica Solar TSM156-9-640BNDG is 22.90%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Ulica Solar TSM156-9-635BNDG use vs Ulica Solar TSM156-9-640BNDG?
Ulica Solar TSM156-9-635BNDG uses TOPCon cells; Ulica Solar TSM156-9-640BNDG 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 Ulica Solar TSM156-9-635BNDG and Ulica Solar TSM156-9-640BNDG?
Ulica Solar TSM156-9-635BNDG has a 30 years power warranty; Ulica Solar TSM156-9-640BNDG 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 Ulica Solar TSM156-9-635BNDG and Ulica Solar TSM156-9-640BNDG bifacial panels?
Both Ulica Solar TSM156-9-635BNDG and Ulica Solar TSM156-9-640BNDG 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.

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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.