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655 vs 665 16 of 19 identical Swap Change panels

Waaree WSMD-655 vs Waaree WSMD-665

Waaree WSMD-655
WSMD-655
655 Wp 20.99 % PERC
Open panel page Datasheet PDF
VS
Waaree WSMD-665
WSMD-665
665 Wp 21.29 % PERC
Open panel page Datasheet PDF
The verdict

665 leads on the differences that matter

The largest is module efficiency: 0.30 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 655 665 Difference
Module efficiency 20.99 % 21.29 % 0.30 pp more efficient
Power density 209.6 Wp/m² 212.8 Wp/m² 3.2 Wp/m² higher
Rated power 655 Wp 665 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.
655
21,228 kWh
665
21,552 kWh
Lifetime gap
324 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 655 665
Standard test conditions 25 °C 100.0% of rated power 655 W 665 W
Cool, bright day 40 °C 94.9% of rated power 622 W 631 W
Typical summer roof 55 °C 89.8% of rated power 588 W 597 W
Hot roof 70 °C 84.7% of rated power 555 W 563 W
03

Full specification

Parameter 655 665 Difference
Power and efficiency
Rated power 655 Wp 665 Wp +10 W for 665
Module efficiency 20.99 % 21.29 % +0.30 pp for 665
Power density 209.6 Wp/m² 212.8 Wp/m² +3.2 Wp/m² for 665
Open-circuit voltage 46.26 V 46.58 V Effectively the same
Voltage at max power 37.94 V 38.10 V Effectively the same
Short-circuit current 17.90 A 18.03 A Effectively the same
Current at max power 17.29 A 17.46 A Effectively the same
Temperature
Temperature coefficient -0.340 %/°C -0.340 %/°C Same
Mechanical
Dimensions 2400x1302x35 mm 2400x1302x35 mm Same
Module area 3.125 m² 3.125 m² Same
Weight 34.5 kg 34.5 kg Same
Weight per kWp 52.7 kg/kWp 51.9 kg/kWp Effectively the same
Warranty and degradation
Product warranty 12 yrs 12 yrs Same
Performance warranty 27 yrs 27 yrs Same
Annual degradation 0.55 %/yr 0.55 %/yr Same
Technology
Cell technology PERC PERC Same
Cell type Monocrystalline Monocrystalline Same
Cell count 132 132 Same
Bifacial No No Same
04

Against the whole database

14,005 panels
Efficiency
#9,944 vs #8,708
665 leads by 1,236 places
Power density
#9,923 vs #8,707
665 leads by 1,216 places
Heat behaviour
#8,778 vs #8,778
Tied - the same position in the database
Weight
#6,295 vs #5,294
665 leads by 1,001 places
Warranty
#9,667 vs #9,667
Tied - the same position in the database
Overall
#4,206 vs #3,494
665 leads by 712 places
05

More useful comparisons

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Waaree WSMD-655 vs Waaree WSMD-660
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Waaree WSMD-655 vs Waaree WSMD-645
3 differences, the largest is module efficiency
Same series, other bin
Waaree WSMD-655 vs Waaree WSMD-545
11 differences, the largest is rated power
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Waaree WSMD-655 vs Waaree WSMD-540
10 differences, the largest is rated power
Same series, other bin
Waaree WSMD-655 vs Waaree WSMD-535
11 differences, the largest is rated power
06

Written summary

07

Questions about this pairing

Which panel is better: Waaree WSMD-655 or Waaree WSMD-665?
According to our database: Waaree WSMD-665 has higher module efficiency (21.29% vs 20.99%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Waaree WSMD-655 and Waaree WSMD-665?
Waaree WSMD-655 has a module efficiency of 20.99%, while Waaree WSMD-665 is 21.29%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Waaree WSMD-655 use vs Waaree WSMD-665?
Waaree WSMD-655 uses PERC cells; Waaree WSMD-665 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 Waaree WSMD-655 and Waaree WSMD-665?
Waaree WSMD-655 has a 27 years power warranty; Waaree WSMD-665 has a 27 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.

Shop prices: See 26 Waaree offers

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.