Waaree Bi-68-660 vs Waaree Bi-68-645
VS
The verdict
660 leads on the differences that matter
The largest is module efficiency: 0.48 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
660
645
Difference
Module efficiency
21.13 %
20.65 %
0.48 pp more efficient
Power density
211.2 Wp/m²
206.4 Wp/m²
4.8 Wp/m² higher
Rated power
660 Wp
645 Wp
15 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.
660
21,390 kWh
645
20,904 kWh
Lifetime gap
486 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
660
645
Standard test conditions
25 °C
100.0% of rated power
660 W
645 W
Cool, bright day
40 °C
94.9% of rated power
626 W
612 W
Typical summer roof
55 °C
89.8% of rated power
593 W
579 W
Hot roof
70 °C
84.7% of rated power
559 W
546 W
03
Full specification
Parameter
660
645
Difference
Power and efficiency
Rated power
660 Wp
645 Wp
+15 W for 660
Module efficiency
21.13 %
20.65 %
+0.48 pp for 660
Power density
211.2 Wp/m²
206.4 Wp/m²
+4.8 Wp/m² for 660
Open-circuit voltage
46.40 V
45.94 V
Effectively the same
Voltage at max power
38.06 V
37.87 V
Effectively the same
Short-circuit current
17.98 A
17.78 A
Effectively the same
Current at max power
17.35 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
39.0 kg
39.0 kg
Same
Weight per kWp
59.1 kg/kWp
60.5 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
132
Same
Bifacial
Yes
Yes
Same
04
14,005 panels
Against the whole database
Efficiency
#9,239
vs
#11,014
660 leads by 1,775 places
Power density
#9,251
vs
#11,023
660 leads by 1,772 places
Heat behaviour
#8,778
vs
#8,778
Tied - the same position in the database
Weight
#12,010
vs
#12,467
660 leads by 457 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#3,318
vs
#4,408
660 leads by 1,090 places
05
Open the full database
More useful comparisons
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3 differences, the largest is module efficiency
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Waaree Bi-68-660 vs Waaree Bi-66-590
9 differences, the largest is rated power
06
Written summary
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07
Questions about this pairing
Which panel is better: Waaree Bi-68-660 or Waaree Bi-68-645?
According to our database: Waaree Bi-68-660 has higher module efficiency (21.13% vs 20.65%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Waaree Bi-68-660 and Waaree Bi-68-645?
Waaree Bi-68-660 has a module efficiency of 21.13%, while Waaree Bi-68-645 is 20.65%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Waaree Bi-68-660 use vs Waaree Bi-68-645?
Waaree Bi-68-660 uses PERC cells; Waaree Bi-68-645 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 Bi-68-660 and Waaree Bi-68-645?
Waaree Bi-68-660 has a 30 years power warranty; Waaree Bi-68-645 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-68-660 and Waaree Bi-68-645 bifacial panels?
Both Waaree Bi-68-660 and Waaree Bi-68-645 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.