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660 vs 650 16 of 19 identical Swap Change panels

Waaree WSMD-660 vs Waaree WSMD-650

Waaree WSMD-660
WSMD-660
660 Wp 21.13 % PERC
Open panel page Datasheet PDF
VS
Waaree WSMD-650
WSMD-650
650 Wp 20.82 % PERC
Open panel page Datasheet PDF
The verdict

660 leads on the differences that matter

The largest is module efficiency: 0.31 pp more efficient. 16 of 19 comparable parameters are identical.

See all 3 differences
How alike are they
16 of 19 comparable
parameters are identical
identical differs
01

What actually differs

3 of 19 parameters
Parameter 660 650 Difference
Module efficiency 21.13 % 20.82 % 0.31 pp more efficient
Power density 211.2 Wp/m² 208.0 Wp/m² 3.2 Wp/m² higher
Rated power 660 Wp 650 Wp 10 W more power
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.
660
21,390 kWh
650
21,066 kWh
Lifetime gap
324 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 660 650
Standard test conditions 25 °C 100.0% of rated power 660 W 650 W
Cool, bright day 40 °C 94.9% of rated power 626 W 617 W
Typical summer roof 55 °C 89.8% of rated power 593 W 584 W
Hot roof 70 °C 84.7% of rated power 559 W 551 W
03

Full specification

Parameter 660 650 Difference
Power and efficiency
Rated power 660 Wp 650 Wp +10 W for 660
Module efficiency 21.13 % 20.82 % +0.31 pp for 660
Power density 211.2 Wp/m² 208.0 Wp/m² +3.2 Wp/m² for 660
Open-circuit voltage 46.40 V 46.09 V Effectively the same
Voltage at max power 38.06 V 37.91 V Effectively the same
Short-circuit current 17.98 A 17.84 A Effectively the same
Current at max power 17.35 A 17.16 A Effectively the same
Temperature
Temperature coefficient -0.340 %/°C -0.340 %/°C Same
Mechanical
Dimensions 2400x1302x35 mm 2400x1302x35 mm Same
Module area 3.125 m² 3.125 m² Same
Weight 34.5 kg 34.5 kg Same
Weight per kWp 52.3 kg/kWp 53.1 kg/kWp Effectively the same
Warranty and degradation
Product warranty 12 yrs 12 yrs Same
Performance warranty 27 yrs 27 yrs Same
Annual degradation 0.55 %/yr 0.55 %/yr Same
Technology
Cell technology PERC PERC Same
Cell type Monocrystalline Monocrystalline Same
Cell count 132 132 Same
Bifacial No No Same
04

Against the whole database

14,005 panels
Efficiency
#9,239 vs #10,443
660 leads by 1,204 places
Power density
#9,251 vs #10,477
660 leads by 1,226 places
Heat behaviour
#8,778 vs #8,778
Tied - the same position in the database
Weight
#5,732 vs #6,836
660 leads by 1,104 places
Warranty
#9,667 vs #9,667
Tied - the same position in the database
Overall
#3,874 vs #4,615
660 leads by 741 places
05

More useful comparisons

Open the full database
Same series, other bin
Waaree WSMD-660 vs Waaree WSMD-665
The same specification on paper
Same series, other bin
Waaree WSMD-660 vs Waaree WSMD-655
The same specification on paper
Same series, other bin
Waaree WSMD-660 vs Waaree WSMD-645
3 differences, the largest is module efficiency
Same series, other bin
Waaree WSMD-660 vs Waaree WSMD-545
10 differences, the largest is rated power
Same series, other bin
Waaree WSMD-660 vs Waaree WSMD-540
10 differences, the largest is rated power
Same series, other bin
Waaree WSMD-660 vs Waaree WSMD-535
12 differences, the largest is rated power
06

Written summary

07

Questions about this pairing

Which panel is better: Waaree WSMD-660 or Waaree WSMD-650?
According to our database: Waaree WSMD-660 has higher module efficiency (21.13% vs 20.82%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Waaree WSMD-660 and Waaree WSMD-650?
Waaree WSMD-660 has a module efficiency of 21.13%, while Waaree WSMD-650 is 20.82%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Waaree WSMD-660 use vs Waaree WSMD-650?
Waaree WSMD-660 uses PERC cells; Waaree WSMD-650 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 WSMD-660 and Waaree WSMD-650?
Waaree WSMD-660 has a 27 years power warranty; Waaree WSMD-650 has a 27 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.

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.