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545 vs 665 9 of 19 identical Swap Change panels

Waaree WSMD-545 vs Waaree WSMD-665

Waaree WSMD-545
WSMD-545
545 Wp 21.17 % PERC
Open panel page Datasheet PDF
VS
Waaree WSMD-665
WSMD-665
665 Wp 21.29 % 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 545 665 Difference
Rated power 545 Wp 665 Wp 120 W more power
Weight 27.5 kg 34.5 kg 7.0 kg lighter
Short-circuit current 13.90 A 18.03 A 4.13 A apart
Module area 2.574 m² 3.125 m² 0.551 m² apart
Open-circuit voltage 49.76 V 46.58 V 3.18 V apart
Temperature coefficient -0.350 %/°C -0.340 %/°C 0.010 %/°C better in heat
Current at max power 13.02 A 17.46 A 4.44 A apart
Cell count 144 132 12 cells apart
Voltage at max power 41.90 V 38.10 V 3.80 V apart
Dimensions 2272x1133x35 mm 2400x1302x35 mm 2272x1133x35 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
545
17,663 kWh
665
21,552 kWh
Lifetime gap
3,889 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 545 665
Standard test conditions 25 °C 100.0% of rated power 545 W 665 W
Cool, bright day 40 °C 94.8% of rated power 516 W 631 W
Typical summer roof 55 °C 89.5% of rated power 488 W 597 W
Hot roof 70 °C 84.2% of rated power 459 W 563 W
03

Full specification

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

Against the whole database

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

More useful comparisons

Open the full database
Same series, other bin
Waaree WSMD-545 vs Waaree WSMD-660
10 differences, the largest is rated power
Same series, other bin
Waaree WSMD-545 vs Waaree WSMD-655
11 differences, the largest is rated power
Same series, other bin
Waaree WSMD-545 vs Waaree WSMD-650
13 differences, the largest is rated power
Same series, other bin
Waaree WSMD-545 vs Waaree WSMD-645
13 differences, the largest is rated power
Same series, other bin
Waaree WSMD-545 vs Waaree WSMD-540
The same specification on paper
Same series, other bin
Waaree WSMD-545 vs Waaree WSMD-535
3 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: Waaree WSMD-545 or Waaree WSMD-665?
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-545 and Waaree WSMD-665?
Waaree WSMD-545 has a module efficiency of 21.17%, while Waaree WSMD-665 is 21.29%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Waaree WSMD-545 use vs Waaree WSMD-665?
Waaree WSMD-545 uses PERC cells; Waaree WSMD-665 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-545 and Waaree WSMD-665?
Waaree WSMD-545 has a 27 years power warranty; Waaree WSMD-665 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.