Waaree Bi-68-655 vs Waaree Bi-66-580
VS
The verdict
68-655 leads on the differences that matter
The largest is rated power: 75 W more power. 10 of 19 comparable parameters are identical.
See all 9 differencesHow alike are they
10
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
9 of 19 parameters
What actually differs
Parameter
68-655
66-580
Difference
Rated power
655 Wp
580 Wp
75 W more power
Module efficiency
20.99 %
20.35 %
0.64 pp more efficient
Weight
39.0 kg
35.5 kg
3.5 kg lighter
Power density
209.6 Wp/m²
203.4 Wp/m²
6.2 Wp/m² higher
Open-circuit voltage
46.26 V
41.56 V
4.70 V apart
Module area
3.125 m²
2.851 m²
0.273 m² apart
Cell count
132
120
12 cells apart
Voltage at max power
37.94 V
34.21 V
3.73 V apart
Dimensions
2400x1302x35 mm
2190x1302x35 mm
2400x1302x35 mm vs 2190x1302x35 mm
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.
68-655
21,228 kWh
66-580
18,797 kWh
Lifetime gap
2,431 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
68-655
66-580
Standard test conditions
25 °C
100.0% of rated power
655 W
580 W
Cool, bright day
40 °C
94.9% of rated power
622 W
550 W
Typical summer roof
55 °C
89.8% of rated power
588 W
521 W
Hot roof
70 °C
84.7% of rated power
555 W
491 W
03
Full specification
Parameter
68-655
66-580
Difference
Power and efficiency
Rated power
655 Wp
580 Wp
+75 W for 68-655
Module efficiency
20.99 %
20.35 %
+0.64 pp for 68-655
Power density
209.6 Wp/m²
203.4 Wp/m²
+6.2 Wp/m² for 68-655
Open-circuit voltage
46.26 V
41.56 V
4.70 V apart
Voltage at max power
37.94 V
34.21 V
3.73 V apart
Short-circuit current
17.90 A
17.73 A
Effectively the same
Current at max power
17.29 A
16.96 A
Effectively the same
Temperature
Temperature coefficient
-0.340 %/°C
-0.340 %/°C
Same
Mechanical
Dimensions
2400x1302x35 mm
2190x1302x35 mm
2400x1302x35 mm vs 2190x1302x35 mm
Module area
3.125 m²
2.851 m²
0.273 m² apart
Weight
39.0 kg
35.5 kg
-3.5 kg for 66-580
Weight per kWp
59.5 kg/kWp
61.2 kg/kWp
Effectively the same
Warranty and degradation
Product warranty
12 yrs
12 yrs
Same
Performance warranty
30 yrs
30 yrs
Same
Annual degradation
0.55 %/yr
0.55 %/yr
Same
Technology
Cell technology
PERC
PERC
Same
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
132
120
12 cells apart
Bifacial
Yes
Yes
Same
04
14,005 panels
Against the whole database
Efficiency
#9,944
vs
#11,718
68-655 leads by 1,774 places
Power density
#9,923
vs
#11,699
68-655 leads by 1,776 places
Heat behaviour
#8,778
vs
#8,778
Tied - the same position in the database
Weight
#12,200
vs
#12,612
68-655 leads by 412 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#3,643
vs
#7,089
68-655 leads by 3,446 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 Bi-68-655 or Waaree Bi-66-580?
According to our database: Waaree Bi-68-655 has higher module efficiency (20.99% vs 20.35%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Waaree Bi-68-655 and Waaree Bi-66-580?
Waaree Bi-68-655 has a module efficiency of 20.99%, while Waaree Bi-66-580 is 20.35%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Waaree Bi-68-655 use vs Waaree Bi-66-580?
Waaree Bi-68-655 uses PERC cells; Waaree Bi-66-580 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 Bi-68-655 and Waaree Bi-66-580?
Waaree Bi-68-655 has a 30 years power warranty; Waaree Bi-66-580 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 Waaree Bi-68-655 and Waaree Bi-66-580 bifacial panels?
Both Waaree Bi-68-655 and Waaree Bi-66-580 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.