Skip to main content
66-595 vs 68-645 11 of 19 identical Swap Change panels

Waaree Bi-66-595 vs Waaree Bi-68-645

Waaree Bi-66-595
Bi-66-595
595 Wp 20.88 % PERC Bifacial
Open panel page Datasheet PDF
VS
Waaree Bi-68-645
Bi-68-645
645 Wp 20.65 % PERC Bifacial
Open panel page Datasheet PDF
The verdict

8 differences, and they point both ways

The largest is rated power: 50 W more power. 11 of 19 comparable parameters are identical.

See all 8 differences
How alike are they
11 of 19 comparable
parameters are identical
identical differs
01

What actually differs

8 of 19 parameters
Parameter 66-595 68-645 Difference
Rated power 595 Wp 645 Wp 50 W more power
Weight 35.5 kg 39.0 kg 3.5 kg lighter
Module area 2.851 m² 3.125 m² 0.273 m² apart
Open-circuit voltage 42.05 V 45.94 V 3.89 V apart
Module efficiency 20.88 % 20.65 % 0.23 pp more efficient
Cell count 120 132 12 cells apart
Voltage at max power 34.44 V 37.87 V 3.43 V apart
Dimensions 2190x1302x35 mm 2400x1302x35 mm 2190x1302x35 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
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.
66-595
19,283 kWh
68-645
20,904 kWh
Lifetime gap
1,621 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 66-595 68-645
Standard test conditions 25 °C 100.0% of rated power 595 W 645 W
Cool, bright day 40 °C 94.9% of rated power 565 W 612 W
Typical summer roof 55 °C 89.8% of rated power 534 W 579 W
Hot roof 70 °C 84.7% of rated power 504 W 546 W
03

Full specification

Parameter 66-595 68-645 Difference
Power and efficiency
Rated power 595 Wp 645 Wp +50 W for 68-645
Module efficiency 20.88 % 20.65 % +0.23 pp for 66-595
Power density 208.7 Wp/m² 206.4 Wp/m² Effectively the same
Open-circuit voltage 42.05 V 45.94 V 3.89 V apart
Voltage at max power 34.44 V 37.87 V 3.43 V apart
Short-circuit current 17.90 A 17.78 A Effectively the same
Current at max power 17.29 A 17.04 A Effectively the same
Temperature
Temperature coefficient -0.340 %/°C -0.340 %/°C Same
Mechanical
Dimensions 2190x1302x35 mm 2400x1302x35 mm 2190x1302x35 mm vs 2400x1302x35 mm
Module area 2.851 m² 3.125 m² 0.273 m² apart
Weight 35.5 kg 39.0 kg -3.5 kg for 66-595
Weight per kWp 59.7 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 120 132 12 cells apart
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#10,320 vs #11,014
66-595 leads by 694 places
Power density
#10,302 vs #11,023
66-595 leads by 721 places
Heat behaviour
#8,778 vs #8,778
Tied - the same position in the database
Weight
#12,231 vs #12,467
66-595 leads by 236 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#5,833 vs #4,408
68-645 leads by 1,425 places
05

More useful comparisons

Open the full database
Same series, other bin
Waaree Bi-66-595 vs Waaree Bi-68-665
9 differences, the largest is rated power
Same series, other bin
Waaree Bi-66-595 vs Waaree Bi-68-660
8 differences, the largest is rated power
Same series, other bin
Waaree Bi-66-595 vs Waaree Bi-68-655
7 differences, the largest is rated power
Same series, other bin
Waaree Bi-66-595 vs Waaree Bi-68-650
7 differences, the largest is rated power
Same series, other bin
Waaree Bi-66-595 vs Waaree Bi-66-600
The same specification on paper
Same series, other bin
Waaree Bi-66-595 vs Waaree Bi-66-590
The same specification on paper
06

Written summary

07

Questions about this pairing

Which panel is better: Waaree Bi-66-595 or Waaree Bi-68-645?
According to our database: Waaree Bi-66-595 has higher module efficiency (20.88% 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-66-595 and Waaree Bi-68-645?
Waaree Bi-66-595 has a module efficiency of 20.88%, 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-66-595 use vs Waaree Bi-68-645?
Waaree Bi-66-595 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-66-595 and Waaree Bi-68-645?
Waaree Bi-66-595 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-66-595 and Waaree Bi-68-645 bifacial panels?
Both Waaree Bi-66-595 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.