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665 vs 545 9 of 19 identical Swap Change panels

Waaree WSMD-665 vs Waaree WSMD-545

Waaree WSMD-665
WSMD-665
665 Wp 21.29 % PERC
Open panel page Datasheet PDF
VS
Waaree WSMD-545
WSMD-545
545 Wp 21.17 % PERC
Open panel page Datasheet PDF
The verdict

665 leads on the differences that matter

The largest is rated power: 120 W more power. 9 of 19 comparable parameters are identical.

See all 10 differences
How alike are they
9 of 19 comparable
parameters are identical
identical differs
01

What actually differs

10 of 19 parameters
Parameter 665 545 Difference
Rated power 665 Wp 545 Wp 120 W more power
Weight 34.5 kg 27.5 kg 7.0 kg lighter
Short-circuit current 18.03 A 13.90 A 4.13 A apart
Module area 3.125 m² 2.574 m² 0.551 m² apart
Open-circuit voltage 46.58 V 49.76 V 3.18 V apart
Temperature coefficient -0.340 %/°C -0.350 %/°C 0.010 %/°C better in heat
Current at max power 17.46 A 13.02 A 4.44 A apart
Cell count 132 144 12 cells apart
Voltage at max power 38.10 V 41.90 V 3.80 V apart
Dimensions 2400x1302x35 mm 2272x1133x35 mm 2400x1302x35 mm vs 2272x1133x35 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
665
21,552 kWh
545
17,663 kWh
Lifetime gap
3,889 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 665 545
Standard test conditions 25 °C 100.0% of rated power 665 W 545 W
Cool, bright day 40 °C 94.8% of rated power 631 W 516 W
Typical summer roof 55 °C 89.5% of rated power 597 W 488 W
Hot roof 70 °C 84.2% of rated power 563 W 459 W
03

Full specification

Parameter 665 545 Difference
Power and efficiency
Rated power 665 Wp 545 Wp +120 W for 665
Module efficiency 21.29 % 21.17 % Effectively the same
Power density 212.8 Wp/m² 211.7 Wp/m² Effectively the same
Open-circuit voltage 46.58 V 49.76 V 3.18 V apart
Voltage at max power 38.10 V 41.90 V 3.80 V apart
Short-circuit current 18.03 A 13.90 A 4.13 A apart
Current at max power 17.46 A 13.02 A 4.44 A apart
Temperature
Temperature coefficient -0.340 %/°C -0.350 %/°C +0.010 %/°C for 665
Mechanical
Dimensions 2400x1302x35 mm 2272x1133x35 mm 2400x1302x35 mm vs 2272x1133x35 mm
Module area 3.125 m² 2.574 m² 0.551 m² apart
Weight 34.5 kg 27.5 kg -7.0 kg for 545
Weight per kWp 51.9 kg/kWp 50.5 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 132 144 12 cells apart
Bifacial No No Same
04

Against the whole database

14,005 panels
Efficiency
#8,708 vs #9,219
665 leads by 511 places
Power density
#8,707 vs #9,168
665 leads by 461 places
Heat behaviour
#8,778 vs #10,419
665 leads by 1,641 places
Weight
#5,294 vs #3,832
545 leads by 1,462 places
Warranty
#9,667 vs #9,667
Tied - the same position in the database
Overall
#3,494 vs #7,908
665 leads by 4,414 places
05

More useful comparisons

Open the full database
Same series, other bin
Waaree WSMD-665 vs Waaree WSMD-660
The same specification on paper
Same series, other bin
Waaree WSMD-665 vs Waaree WSMD-655
3 differences, the largest is module efficiency
Same series, other bin
Waaree WSMD-665 vs Waaree WSMD-650
3 differences, the largest is module efficiency
Same series, other bin
Waaree WSMD-665 vs Waaree WSMD-645
3 differences, the largest is module efficiency
Same series, other bin
Waaree WSMD-665 vs Waaree WSMD-540
12 differences, the largest is rated power
Same series, other bin
Waaree WSMD-665 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-665 or Waaree WSMD-545?
According to our database: Waaree WSMD-665 has higher module efficiency (21.29% vs 21.17%); Waaree WSMD-665 tolerates heat better (temp coeff -0.340%/°C vs -0.350%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Waaree WSMD-665 and Waaree WSMD-545?
Waaree WSMD-665 has a module efficiency of 21.29%, while Waaree WSMD-545 is 21.17%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Waaree WSMD-665 use vs Waaree WSMD-545?
Waaree WSMD-665 uses PERC cells; Waaree WSMD-545 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-665 and Waaree WSMD-545?
Waaree WSMD-665 has a 27 years power warranty; Waaree WSMD-545 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.