650 vs 660 16 of 19 identical Swap Change panels

Waaree WSMD-650 vs Waaree WSMD-660

Q: Which panel is better: Waaree WSMD-650 or Waaree WSMD-660?

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.

Q: What is the efficiency of Waaree WSMD-650 and Waaree WSMD-660?

Waaree WSMD-650 has a module efficiency of 20.82%, while Waaree WSMD-660 is 21.13%. Higher efficiency means more electricity from the same roof area - useful when space is limited.

Q: What cell technology does Waaree WSMD-650 use vs Waaree WSMD-660?

Waaree WSMD-650 uses PERC cells; Waaree WSMD-660 uses PERC. Modern n-type technologies (TOPCon, HJT, BC) typically deliver higher efficiency and lower degradation compared to older PERC (p-type) cells.

Q: What is the warranty on Waaree WSMD-650 and Waaree WSMD-660?

Waaree WSMD-650 has a 27 years power warranty; Waaree WSMD-660 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.

WSMD-650

650 Wp 20.82 % PERC

Open panel page Datasheet PDF

WSMD-660

660 Wp 21.13 % 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

What actually differs

3 of 19 parameters

Parameter 650 660 Difference

Module efficiency 20.82 % 21.13 % 0.31 pp more efficient

Power density 208.0 Wp/m² 211.2 Wp/m² 3.2 Wp/m² higher

Rated power 650 Wp 660 Wp 10 W more power

What it means on a roof

Thirty years of production

Each panel's own declared degradation curve, at 1,200 kWh/kWp a year

Cell temperature

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.

650

21,066 kWh

660

21,390 kWh

Lifetime gap

324 kWh

Output when it is hot

Rated power carried across the range a module actually sees

Scenario 650 660

Standard test conditions 25 °C 100.0% of rated power 650 W 660 W

Cool, bright day 40 °C 94.9% of rated power 617 W 626 W

Typical summer roof 55 °C 89.8% of rated power 584 W 593 W

Hot roof 70 °C 84.7% of rated power 551 W 559 W

Full specification

Parameter 650 660 Difference

Power and efficiency

Rated power 650 Wp 660 Wp +10 W for 660

Module efficiency 20.82 % 21.13 % +0.31 pp for 660

Power density 208.0 Wp/m² 211.2 Wp/m² +3.2 Wp/m² for 660

Open-circuit voltage 46.09 V 46.40 V Effectively the same

Voltage at max power 37.91 V 38.06 V Effectively the same

Short-circuit current 17.84 A 17.98 A Effectively the same

Current at max power 17.16 A 17.35 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 53.1 kg/kWp 52.3 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

Against the whole database

14,005 panels

Efficiency

#10,443 vs #9,239

660 leads by 1,204 places

Power density

#10,477 vs #9,251

660 leads by 1,226 places

Heat behaviour

#8,778 vs #8,778

Tied - the same position in the database

Weight

#6,836 vs #5,732

660 leads by 1,104 places

Warranty

#9,667 vs #9,667

Tied - the same position in the database

Overall

#4,615 vs #3,874

660 leads by 741 places

More useful comparisons

Open the full database

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Written summary

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Questions about this pairing

Which panel is better: Waaree WSMD-650 or Waaree WSMD-660?

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-650 and Waaree WSMD-660?

Waaree WSMD-650 has a module efficiency of 20.82%, while Waaree WSMD-660 is 21.13%. Higher efficiency means more electricity from the same roof area - useful when space is limited.

What cell technology does Waaree WSMD-650 use vs Waaree WSMD-660?

Waaree WSMD-650 uses PERC cells; Waaree WSMD-660 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-650 and Waaree WSMD-660?

Waaree WSMD-650 has a 27 years power warranty; Waaree WSMD-660 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.