Waaree Bi-66-600 vs Waaree Bi-55-540
VS
The verdict
66-600 leads on the differences that matter
The largest is rated power: 60 W more power. 9 of 19 comparable parameters are identical.
See all 10 differencesHow alike are they
9
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
10 of 19 parameters
What actually differs
Parameter
66-600
55-540
Difference
Rated power
600 Wp
540 Wp
60 W more power
Weight
35.5 kg
32.5 kg
3.0 kg lighter
Open-circuit voltage
42.18 V
49.61 V
7.43 V apart
Short-circuit current
17.98 A
13.83 A
4.15 A apart
Module area
2.851 m²
2.574 m²
0.277 m² apart
Temperature coefficient
-0.340 %/°C
-0.350 %/°C
0.010 %/°C better in heat
Voltage at max power
34.62 V
41.75 V
7.13 V apart
Current at max power
17.35 A
12.95 A
4.40 A apart
Cell count
120
144
24 cells apart
Dimensions
2190x1302x35 mm
2272x1133x35 mm
2190x1302x35 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
66-600
19,445 kWh
55-540
17,501 kWh
Lifetime gap
1,944 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
66-600
55-540
Standard test conditions
25 °C
100.0% of rated power
600 W
540 W
Cool, bright day
40 °C
94.8% of rated power
569 W
512 W
Typical summer roof
55 °C
89.5% of rated power
539 W
483 W
Hot roof
70 °C
84.2% of rated power
508 W
455 W
03
Full specification
Parameter
66-600
55-540
Difference
Power and efficiency
Rated power
600 Wp
540 Wp
+60 W for 66-600
Module efficiency
21.06 %
20.98 %
Effectively the same
Power density
210.4 Wp/m²
209.8 Wp/m²
Effectively the same
Open-circuit voltage
42.18 V
49.61 V
7.43 V apart
Voltage at max power
34.62 V
41.75 V
7.13 V apart
Short-circuit current
17.98 A
13.83 A
4.15 A apart
Current at max power
17.35 A
12.95 A
4.40 A apart
Temperature
Temperature coefficient
-0.340 %/°C
-0.350 %/°C
+0.010 %/°C for 66-600
Mechanical
Dimensions
2190x1302x35 mm
2272x1133x35 mm
2190x1302x35 mm vs 2272x1133x35 mm
Module area
2.851 m²
2.574 m²
0.277 m² apart
Weight
35.5 kg
32.5 kg
-3.0 kg for 55-540
Weight per kWp
59.2 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
120
144
24 cells apart
Bifacial
Yes
Yes
Same
04
14,005 panels
Against the whole database
Efficiency
#9,625
vs
#9,963
66-600 leads by 338 places
Power density
#9,633
vs
#9,905
66-600 leads by 272 places
Heat behaviour
#8,778
vs
#10,419
66-600 leads by 1,641 places
Weight
#12,042
vs
#12,384
66-600 leads by 342 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#5,464
vs
#7,782
66-600 leads by 2,318 places
05
Open the full database
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The same specification on paper
06
Written summary
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07
Questions about this pairing
Which panel is better: Waaree Bi-66-600 or Waaree Bi-55-540?
According to our database: Waaree Bi-66-600 has higher module efficiency (21.06% vs 20.98%); Waaree Bi-66-600 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-66-600 and Waaree Bi-55-540?
Waaree Bi-66-600 has a module efficiency of 21.06%, 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-66-600 use vs Waaree Bi-55-540?
Waaree Bi-66-600 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-66-600 and Waaree Bi-55-540?
Waaree Bi-66-600 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-66-600 and Waaree Bi-55-540 bifacial panels?
Both Waaree Bi-66-600 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.