Waaree WSMD-655 vs Waaree WSMD-645
VS
The verdict
655 leads on the differences that matter
The largest is module efficiency: 0.34 pp more efficient. 16 of 19 comparable parameters are identical.
See all 3 differencesHow alike are they
16
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
3 of 19 parameters
What actually differs
Parameter
655
645
Difference
Module efficiency
20.99 %
20.65 %
0.34 pp more efficient
Power density
209.6 Wp/m²
206.4 Wp/m²
3.2 Wp/m² higher
Rated power
655 Wp
645 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
645
20,904 kWh
Lifetime gap
324 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
655
645
Standard test conditions
25 °C
100.0% of rated power
655 W
645 W
Cool, bright day
40 °C
94.9% of rated power
622 W
612 W
Typical summer roof
55 °C
89.8% of rated power
588 W
579 W
Hot roof
70 °C
84.7% of rated power
555 W
546 W
03
Full specification
Parameter
655
645
Difference
Power and efficiency
Rated power
655 Wp
645 Wp
+10 W for 655
Module efficiency
20.99 %
20.65 %
+0.34 pp for 655
Power density
209.6 Wp/m²
206.4 Wp/m²
+3.2 Wp/m² for 655
Open-circuit voltage
46.26 V
45.94 V
Effectively the same
Voltage at max power
37.94 V
37.87 V
Effectively the same
Short-circuit current
17.90 A
17.78 A
Effectively the same
Current at max power
17.29 A
17.04 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
53.5 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
14,005 panels
Against the whole database
Efficiency
#9,944
vs
#11,014
655 leads by 1,070 places
Power density
#9,923
vs
#11,023
655 leads by 1,100 places
Heat behaviour
#8,778
vs
#8,778
Tied - the same position in the database
Weight
#6,295
vs
#7,451
655 leads by 1,156 places
Warranty
#9,667
vs
#9,667
Tied - the same position in the database
Overall
#4,206
vs
#4,962
655 leads by 756 places
05
Open the full database
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06
Written summary
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07
Questions about this pairing
Which panel is better: Waaree WSMD-655 or Waaree WSMD-645?
According to our database: Waaree WSMD-655 has higher module efficiency (20.99% vs 20.65%). 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-645?
Waaree WSMD-655 has a module efficiency of 20.99%, while Waaree WSMD-645 is 20.65%. 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-645?
Waaree WSMD-655 uses PERC cells; Waaree WSMD-645 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-645?
Waaree WSMD-655 has a 27 years power warranty; Waaree WSMD-645 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.