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665M-132DG vs 655M-132DG 16 of 19 identical Swap Change panels

Ulica Solar UL-665M-132DG vs Ulica Solar UL-655M-132DG

Ulica Solar
UL-665M-132DG
665 Wp 21.41 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
Ulica Solar
UL-655M-132DG
655 Wp 21.09 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

665M-132DG leads on the differences that matter

The largest is module efficiency: 0.32 pp more efficient. 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 665M-132DG 655M-132DG Difference
Module efficiency 21.41 % 21.09 % 0.32 pp more efficient
Power density 214.1 Wp/m² 210.9 Wp/m² 3.2 Wp/m² higher
Rated power 665 Wp 655 Wp 10 W more power
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 (-0.340 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
665M-132DG
22,312 kWh
655M-132DG
21,977 kWh
Lifetime gap
335 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 665M-132DG 655M-132DG
Standard test conditions 25 °C 100.0% of rated power 665 W 655 W
Cool, bright day 40 °C 94.9% of rated power 631 W 622 W
Typical summer roof 55 °C 89.8% of rated power 597 W 588 W
Hot roof 70 °C 84.7% of rated power 563 W 555 W
03

Full specification

Parameter 665M-132DG 655M-132DG Difference
Power and efficiency
Rated power 665 Wp 655 Wp +10 W for 665M-132DG
Module efficiency 21.41 % 21.09 % +0.32 pp for 665M-132DG
Power density 214.1 Wp/m² 210.9 Wp/m² +3.2 Wp/m² for 665M-132DG
Open-circuit voltage 45.80 V 45.60 V Effectively the same
Voltage at max power 38.30 V 38.10 V Effectively the same
Short-circuit current 18.53 A 18.35 A Effectively the same
Current at max power 17.36 A 17.19 A Effectively the same
Temperature
Temperature coefficient -0.340 %/°C -0.340 %/°C Same
Mechanical
Dimensions 2384x1303x35 mm 2384x1303x35 mm Same
Module area 3.106 m² 3.106 m² Same
Weight 37.3 kg 37.3 kg Same
Weight per kWp 56.1 kg/kWp 56.9 kg/kWp Effectively the same
Warranty and degradation
Product warranty 12 yrs 12 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

14,005 panels
Efficiency
#8,280 vs #9,519
665M-132DG leads by 1,239 places
Power density
#8,250 vs #9,459
665M-132DG leads by 1,209 places
Heat behaviour
#8,778 vs #8,778
Tied - the same position in the database
Weight
#10,380 vs #10,955
665M-132DG leads by 575 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#2,787 vs #3,509
665M-132DG leads by 722 places
05

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06

Written summary

07

Questions about this pairing

Which panel is better: Ulica Solar UL-665M-132DG or Ulica Solar UL-655M-132DG?
According to our database: Ulica Solar UL-665M-132DG has higher module efficiency (21.41% vs 21.09%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Ulica Solar UL-665M-132DG and Ulica Solar UL-655M-132DG?
Ulica Solar UL-665M-132DG has a module efficiency of 21.41%, while Ulica Solar UL-655M-132DG is 21.09%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Ulica Solar UL-665M-132DG use vs Ulica Solar UL-655M-132DG?
Ulica Solar UL-665M-132DG uses TOPCon cells; Ulica Solar UL-655M-132DG 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 UL-665M-132DG and Ulica Solar UL-655M-132DG?
Ulica Solar UL-665M-132DG has a 30 years power warranty; Ulica Solar UL-655M-132DG 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 UL-665M-132DG and Ulica Solar UL-655M-132DG bifacial panels?
Both Ulica Solar UL-665M-132DG and Ulica Solar UL-655M-132DG 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.