Waaree Bi-68-665 vs Waaree Bi-66-590
VS
The verdict
68-665 leads on the differences that matter
The largest is rated power: 75 W more power. 10 of 19 comparable parameters are identical.
See all 9 differencesHow alike are they
10
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
9 of 19 parameters
What actually differs
Parameter
68-665
66-590
Difference
Rated power
665 Wp
590 Wp
75 W more power
Module efficiency
21.29 %
20.70 %
0.59 pp more efficient
Weight
39.0 kg
35.5 kg
3.5 kg lighter
Open-circuit voltage
46.58 V
41.90 V
4.68 V apart
Module area
3.125 m²
2.851 m²
0.273 m² apart
Power density
212.8 Wp/m²
206.9 Wp/m²
5.9 Wp/m² higher
Cell count
132
120
12 cells apart
Voltage at max power
38.10 V
34.39 V
3.71 V apart
Dimensions
2400x1302x35 mm
2190x1302x35 mm
2400x1302x35 mm vs 2190x1302x35 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
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.
68-665
21,552 kWh
66-590
19,121 kWh
Lifetime gap
2,431 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
68-665
66-590
Standard test conditions
25 °C
100.0% of rated power
665 W
590 W
Cool, bright day
40 °C
94.9% of rated power
631 W
560 W
Typical summer roof
55 °C
89.8% of rated power
597 W
530 W
Hot roof
70 °C
84.7% of rated power
563 W
500 W
03
Full specification
Parameter
68-665
66-590
Difference
Power and efficiency
Rated power
665 Wp
590 Wp
+75 W for 68-665
Module efficiency
21.29 %
20.70 %
+0.59 pp for 68-665
Power density
212.8 Wp/m²
206.9 Wp/m²
+5.9 Wp/m² for 68-665
Open-circuit voltage
46.58 V
41.90 V
4.68 V apart
Voltage at max power
38.10 V
34.39 V
3.71 V apart
Short-circuit current
18.03 A
17.84 A
Effectively the same
Current at max power
17.46 A
17.16 A
Effectively the same
Temperature
Temperature coefficient
-0.340 %/°C
-0.340 %/°C
Same
Mechanical
Dimensions
2400x1302x35 mm
2190x1302x35 mm
2400x1302x35 mm vs 2190x1302x35 mm
Module area
3.125 m²
2.851 m²
0.273 m² apart
Weight
39.0 kg
35.5 kg
-3.5 kg for 66-590
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
120
12 cells apart
Bifacial
Yes
Yes
Same
04
14,005 panels
Against the whole database
Efficiency
#8,708
vs
#10,764
68-665 leads by 2,056 places
Power density
#8,707
vs
#10,900
68-665 leads by 2,193 places
Heat behaviour
#8,778
vs
#8,778
Tied - the same position in the database
Weight
#11,826
vs
#12,378
68-665 leads by 552 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#2,941
vs
#6,278
68-665 leads by 3,337 places
05
Open the full database
More useful comparisons
Same series, other bin
Waaree Bi-68-665 vs Waaree Bi-68-660
The same specification on paper
Same series, other bin
Waaree Bi-68-665 vs Waaree Bi-68-655
3 differences, the largest is module efficiency
Same series, other bin
Waaree Bi-68-665 vs Waaree Bi-68-650
3 differences, the largest is module efficiency
Same series, other bin
Waaree Bi-68-665 vs Waaree Bi-68-645
3 differences, the largest is module efficiency
Same series, other bin
Waaree Bi-68-665 vs Waaree Bi-66-600
8 differences, the largest is rated power
Same series, other bin
Waaree Bi-68-665 vs Waaree Bi-66-595
9 differences, the largest is rated power
06
Written summary
Checking cache...
07
Questions about this pairing
Which panel is better: Waaree Bi-68-665 or Waaree Bi-66-590?
According to our database: Waaree Bi-68-665 has higher module efficiency (21.29% vs 20.70%). 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-66-590?
Waaree Bi-68-665 has a module efficiency of 21.29%, while Waaree Bi-66-590 is 20.70%. 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-66-590?
Waaree Bi-68-665 uses PERC cells; Waaree Bi-66-590 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-66-590?
Waaree Bi-68-665 has a 30 years power warranty; Waaree Bi-66-590 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-66-590 bifacial panels?
Both Waaree Bi-68-665 and Waaree Bi-66-590 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.