650 vs 645 19 of 19 identical Swap Change panels

Waaree WSMD-650 vs Waaree WSMD-645

Q: Which panel is better: Waaree WSMD-650 or Waaree WSMD-645?

According to our database: Waaree WSMD-650 has higher module efficiency (20.82% vs 20.65%). 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-645?

Waaree WSMD-650 has a module efficiency of 20.82%, while Waaree WSMD-645 is 20.65%. 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-645?

Waaree WSMD-650 uses PERC cells; Waaree WSMD-645 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-645?

Waaree WSMD-650 has a 27 years power warranty; Waaree WSMD-645 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-645

645 Wp 20.65 % PERC

Open panel page Datasheet PDF

The verdict

Identical on every published parameter

All 19 comparable parameters agree. Two records this alike are usually one panel sold under two names, or two bins of the same production line - decide on price and on who you would rather buy from.

How alike are they

19 of 19 comparable
parameters are identical

identical differs

What actually differs

0 of 19 parameters

Every comparable parameter agrees. The full specification is below.

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

645

20,904 kWh

Lifetime gap

162 kWh

Output when it is hot

Rated power carried across the range a module actually sees

Scenario 650 645

Standard test conditions 25 °C 100.0% of rated power 650 W 645 W

Cool, bright day 40 °C 94.9% of rated power 617 W 612 W

Typical summer roof 55 °C 89.8% of rated power 584 W 579 W

Hot roof 70 °C 84.7% of rated power 551 W 546 W

Full specification

Parameter 650 645 Difference

Power and efficiency

Rated power 650 Wp 645 Wp Effectively the same

Module efficiency 20.82 % 20.65 % Effectively the same

Power density 208.0 Wp/m² 206.4 Wp/m² Effectively the same

Open-circuit voltage 46.09 V 45.94 V Effectively the same

Voltage at max power 37.91 V 37.87 V Effectively the same

Short-circuit current 17.84 A 17.78 A Effectively the same

Current at max power 17.16 A 17.04 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 53.5 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 #11,014

650 leads by 571 places

Power density

#10,477 vs #11,023

650 leads by 546 places

Heat behaviour

#8,778 vs #8,778

Tied - the same position in the database

Weight

#6,836 vs #7,451

650 leads by 615 places

Warranty

#9,667 vs #9,667

Tied - the same position in the database

Overall

#4,615 vs #4,962

650 leads by 347 places

More useful comparisons

Open the full database

Same series, other bin

Waaree WSMD-650 vs Waaree WSMD-665

3 differences, the largest is module efficiency

Same series, other bin

Waaree WSMD-650 vs Waaree WSMD-660

3 differences, the largest is module efficiency

Same series, other bin

Waaree WSMD-650 vs Waaree WSMD-655

The same specification on paper

Same series, other bin

Waaree WSMD-650 vs Waaree WSMD-545

13 differences, the largest is rated power

Same series, other bin

Waaree WSMD-650 vs Waaree WSMD-540

11 differences, the largest is rated power

Same series, other bin

Waaree WSMD-650 vs Waaree WSMD-535

10 differences, the largest is rated power

Written summary

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Questions about this pairing

Which panel is better: Waaree WSMD-650 or Waaree WSMD-645?

According to our database: Waaree WSMD-650 has higher module efficiency (20.82% vs 20.65%). 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-645?

Waaree WSMD-650 has a module efficiency of 20.82%, while Waaree WSMD-645 is 20.65%. 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-645?

Waaree WSMD-650 uses PERC cells; Waaree WSMD-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 WSMD-650 and Waaree WSMD-645?

Waaree WSMD-650 has a 27 years power warranty; Waaree WSMD-645 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.