Waaree Bi-66-580 vs Waaree Bi-68-665
VS
The verdict
68-665 leads on the differences that matter
The largest is module efficiency: 0.94 pp more efficient. 8 of 19 comparable parameters are identical.
See all 11 differencesHow alike are they
8
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
11 of 19 parameters
What actually differs
Parameter
66-580
68-665
Difference
Module efficiency
20.35 %
21.29 %
0.94 pp more efficient
Rated power
580 Wp
665 Wp
85 W more power
Power density
203.4 Wp/m²
212.8 Wp/m²
9.4 Wp/m² higher
Weight
35.5 kg
39.0 kg
3.5 kg lighter
Open-circuit voltage
41.56 V
46.58 V
5.02 V apart
Module area
2.851 m²
3.125 m²
0.273 m² apart
Cell count
120
132
12 cells apart
Voltage at max power
34.21 V
38.10 V
3.89 V apart
Weight per kWp
61.2 kg/kWp
58.6 kg/kWp
2.6 kg/kWp lighter
Dimensions
2190x1302x35 mm
2400x1302x35 mm
2190x1302x35 mm vs 2400x1302x35 mm
Current at max power
16.96 A
17.46 A
0.50 A apart
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.
66-580
18,797 kWh
68-665
21,552 kWh
Lifetime gap
2,755 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
66-580
68-665
Standard test conditions
25 °C
100.0% of rated power
580 W
665 W
Cool, bright day
40 °C
94.9% of rated power
550 W
631 W
Typical summer roof
55 °C
89.8% of rated power
521 W
597 W
Hot roof
70 °C
84.7% of rated power
491 W
563 W
03
Full specification
Parameter
66-580
68-665
Difference
Power and efficiency
Rated power
580 Wp
665 Wp
+85 W for 68-665
Module efficiency
20.35 %
21.29 %
+0.94 pp for 68-665
Power density
203.4 Wp/m²
212.8 Wp/m²
+9.4 Wp/m² for 68-665
Open-circuit voltage
41.56 V
46.58 V
5.02 V apart
Voltage at max power
34.21 V
38.10 V
3.89 V apart
Short-circuit current
17.73 A
18.03 A
Effectively the same
Current at max power
16.96 A
17.46 A
0.50 A apart
Temperature
Temperature coefficient
-0.340 %/°C
-0.340 %/°C
Same
Mechanical
Dimensions
2190x1302x35 mm
2400x1302x35 mm
2190x1302x35 mm vs 2400x1302x35 mm
Module area
2.851 m²
3.125 m²
0.273 m² apart
Weight
35.5 kg
39.0 kg
-3.5 kg for 66-580
Weight per kWp
61.2 kg/kWp
58.6 kg/kWp
-2.6 kg/kWp for 68-665
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
120
132
12 cells apart
Bifacial
Yes
Yes
Same
04
14,005 panels
Against the whole database
Efficiency
#11,718
vs
#8,708
68-665 leads by 3,010 places
Power density
#11,699
vs
#8,707
68-665 leads by 2,992 places
Heat behaviour
#8,778
vs
#8,778
Tied - the same position in the database
Weight
#12,612
vs
#11,826
68-665 leads by 786 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#7,089
vs
#2,941
68-665 leads by 4,148 places
05
Open the full database
More useful comparisons
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Waaree Bi-66-580 vs Waaree Bi-66-600
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Waaree Bi-66-580 vs Waaree Bi-66-595
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06
Written summary
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07
Questions about this pairing
Which panel is better: Waaree Bi-66-580 or Waaree Bi-68-665?
According to our database: Waaree Bi-68-665 has higher module efficiency (21.29% 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-66-580 and Waaree Bi-68-665?
Waaree Bi-66-580 has a module efficiency of 20.35%, while Waaree Bi-68-665 is 21.29%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Waaree Bi-66-580 use vs Waaree Bi-68-665?
Waaree Bi-66-580 uses PERC cells; Waaree Bi-68-665 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 Bi-66-580 and Waaree Bi-68-665?
Waaree Bi-66-580 has a 30 years power warranty; Waaree Bi-68-665 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-66-580 and Waaree Bi-68-665 bifacial panels?
Both Waaree Bi-66-580 and Waaree Bi-68-665 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.