Waaree Bi-55-540 vs Waaree Bi-68-645
VS
The verdict
12 differences, and they point both ways
The largest is rated power: 105 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
55-540
68-645
Difference
Rated power
540 Wp
645 Wp
105 W more power
Weight
32.5 kg
39.0 kg
6.5 kg lighter
Module efficiency
20.98 %
20.65 %
0.33 pp more efficient
Short-circuit current
13.83 A
17.78 A
3.95 A apart
Module area
2.574 m²
3.125 m²
0.551 m² apart
Open-circuit voltage
49.61 V
45.94 V
3.67 V apart
Temperature coefficient
-0.350 %/°C
-0.340 %/°C
0.010 %/°C better in heat
Power density
209.8 Wp/m²
206.4 Wp/m²
3.4 Wp/m² higher
Current at max power
12.95 A
17.04 A
4.09 A apart
Cell count
144
132
12 cells apart
Voltage at max power
41.75 V
37.87 V
3.88 V apart
Dimensions
2272x1133x35 mm
2400x1302x35 mm
2272x1133x35 mm vs 2400x1302x35 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
55-540
17,501 kWh
68-645
20,904 kWh
Lifetime gap
3,403 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
55-540
68-645
Standard test conditions
25 °C
100.0% of rated power
540 W
645 W
Cool, bright day
40 °C
94.8% of rated power
512 W
612 W
Typical summer roof
55 °C
89.5% of rated power
483 W
579 W
Hot roof
70 °C
84.2% of rated power
455 W
546 W
03
Full specification
Parameter
55-540
68-645
Difference
Power and efficiency
Rated power
540 Wp
645 Wp
+105 W for 68-645
Module efficiency
20.98 %
20.65 %
+0.33 pp for 55-540
Power density
209.8 Wp/m²
206.4 Wp/m²
+3.4 Wp/m² for 55-540
Open-circuit voltage
49.61 V
45.94 V
3.67 V apart
Voltage at max power
41.75 V
37.87 V
3.88 V apart
Short-circuit current
13.83 A
17.78 A
3.95 A apart
Current at max power
12.95 A
17.04 A
4.09 A apart
Temperature
Temperature coefficient
-0.350 %/°C
-0.340 %/°C
+0.010 %/°C for 68-645
Mechanical
Dimensions
2272x1133x35 mm
2400x1302x35 mm
2272x1133x35 mm vs 2400x1302x35 mm
Module area
2.574 m²
3.125 m²
0.551 m² apart
Weight
32.5 kg
39.0 kg
-6.5 kg for 55-540
Weight per kWp
60.2 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
144
132
12 cells apart
Bifacial
Yes
Yes
Same
04
14,005 panels
Against the whole database
Efficiency
#9,963
vs
#11,014
55-540 leads by 1,051 places
Power density
#9,905
vs
#11,023
55-540 leads by 1,118 places
Heat behaviour
#10,419
vs
#8,778
68-645 leads by 1,641 places
Weight
#12,384
vs
#12,467
55-540 leads by 83 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#7,782
vs
#4,408
68-645 leads by 3,374 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-55-540 or Waaree Bi-68-645?
According to our database: Waaree Bi-55-540 has higher module efficiency (20.98% vs 20.65%); Waaree Bi-68-645 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-55-540 and Waaree Bi-68-645?
Waaree Bi-55-540 has a module efficiency of 20.98%, 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-55-540 use vs Waaree Bi-68-645?
Waaree Bi-55-540 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-55-540 and Waaree Bi-68-645?
Waaree Bi-55-540 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-55-540 and Waaree Bi-68-645 bifacial panels?
Both Waaree Bi-55-540 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.
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.