Waaree Bi-68-665 vs Waaree Bi-55-540
VS
The verdict
68-665 leads on the differences that matter
The largest is rated power: 125 W more power. 7 of 19 comparable parameters are identical.
See all 12 differencesHow alike are they
7
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
12 of 19 parameters
What actually differs
Parameter
68-665
55-540
Difference
Rated power
665 Wp
540 Wp
125 W more power
Weight
39.0 kg
32.5 kg
6.5 kg lighter
Short-circuit current
18.03 A
13.83 A
4.20 A apart
Module area
3.125 m²
2.574 m²
0.551 m² apart
Module efficiency
21.29 %
20.98 %
0.31 pp more efficient
Open-circuit voltage
46.58 V
49.61 V
3.03 V apart
Temperature coefficient
-0.340 %/°C
-0.350 %/°C
0.010 %/°C better in heat
Power density
212.8 Wp/m²
209.8 Wp/m²
3.0 Wp/m² higher
Current at max power
17.46 A
12.95 A
4.51 A apart
Cell count
132
144
12 cells apart
Voltage at max power
38.10 V
41.75 V
3.65 V apart
Dimensions
2400x1302x35 mm
2272x1133x35 mm
2400x1302x35 mm vs 2272x1133x35 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
68-665
21,552 kWh
55-540
17,501 kWh
Lifetime gap
4,051 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
68-665
55-540
Standard test conditions
25 °C
100.0% of rated power
665 W
540 W
Cool, bright day
40 °C
94.8% of rated power
631 W
512 W
Typical summer roof
55 °C
89.5% of rated power
597 W
483 W
Hot roof
70 °C
84.2% of rated power
563 W
455 W
03
Full specification
Parameter
68-665
55-540
Difference
Power and efficiency
Rated power
665 Wp
540 Wp
+125 W for 68-665
Module efficiency
21.29 %
20.98 %
+0.31 pp for 68-665
Power density
212.8 Wp/m²
209.8 Wp/m²
+3.0 Wp/m² for 68-665
Open-circuit voltage
46.58 V
49.61 V
3.03 V apart
Voltage at max power
38.10 V
41.75 V
3.65 V apart
Short-circuit current
18.03 A
13.83 A
4.20 A apart
Current at max power
17.46 A
12.95 A
4.51 A apart
Temperature
Temperature coefficient
-0.340 %/°C
-0.350 %/°C
+0.010 %/°C for 68-665
Mechanical
Dimensions
2400x1302x35 mm
2272x1133x35 mm
2400x1302x35 mm vs 2272x1133x35 mm
Module area
3.125 m²
2.574 m²
0.551 m² apart
Weight
39.0 kg
32.5 kg
-6.5 kg for 55-540
Weight per kWp
58.6 kg/kWp
60.2 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
144
12 cells apart
Bifacial
Yes
Yes
Same
04
14,005 panels
Against the whole database
Efficiency
#8,708
vs
#9,963
68-665 leads by 1,255 places
Power density
#8,707
vs
#9,905
68-665 leads by 1,198 places
Heat behaviour
#8,778
vs
#10,419
68-665 leads by 1,641 places
Weight
#11,826
vs
#12,384
68-665 leads by 558 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#2,941
vs
#7,782
68-665 leads by 4,841 places
05
Open the full database
More useful comparisons
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Waaree Bi-68-665 vs Waaree Bi-66-600
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Waaree Bi-68-665 vs Waaree Bi-66-595
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-68-665 or Waaree Bi-55-540?
According to our database: Waaree Bi-68-665 has higher module efficiency (21.29% vs 20.98%); Waaree Bi-68-665 tolerates heat better (temp coeff -0.340%/°C vs -0.350%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Waaree Bi-68-665 and Waaree Bi-55-540?
Waaree Bi-68-665 has a module efficiency of 21.29%, while Waaree Bi-55-540 is 20.98%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Waaree Bi-68-665 use vs Waaree Bi-55-540?
Waaree Bi-68-665 uses PERC cells; Waaree Bi-55-540 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-68-665 and Waaree Bi-55-540?
Waaree Bi-68-665 has a 30 years power warranty; Waaree Bi-55-540 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-68-665 and Waaree Bi-55-540 bifacial panels?
Both Waaree Bi-68-665 and Waaree Bi-55-540 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.
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.