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WSMDi-405 vs WSMD-665 8 of 19 identical Swap Change panels

Waaree WSMDi-405 vs Waaree WSMD-665

Waaree WSMDi-405
WSMDi-405
405 Wp 20.28 % PERC
Open panel page Datasheet PDF
VS
Waaree WSMD-665
WSMD-665
665 Wp 21.29 % PERC
Open panel page Datasheet PDF
The verdict

WSMD-665 leads on the differences that matter

The largest is module efficiency: 1.01 pp more efficient. 8 of 19 comparable parameters are identical.

See all 11 differences
How alike are they
8 of 19 comparable
parameters are identical
identical differs
01

What actually differs

11 of 19 parameters
Parameter WSMDi-405 WSMD-665 Difference
Module efficiency 20.28 % 21.29 % 1.01 pp more efficient
Rated power 405 Wp 665 Wp 260 W more power
Power density 202.8 Wp/m² 212.8 Wp/m² 10.0 Wp/m² higher
Temperature coefficient -0.365 %/°C -0.340 %/°C 0.025 %/°C better in heat
Weight 22.0 kg 34.5 kg 12.5 kg lighter
Short-circuit current 11.40 A 18.03 A 6.63 A apart
Module area 1.997 m² 3.125 m² 1.128 m² apart
Current at max power 10.61 A 17.46 A 6.85 A apart
Weight per kWp 54.3 kg/kWp 51.9 kg/kWp 2.4 kg/kWp lighter
Open-circuit voltage 45.44 V 46.58 V 1.14 V apart
Dimensions 1924x1038x35 mm 2400x1302x35 mm 1924x1038x35 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
WSMDi-405
13,126 kWh
WSMD-665
21,552 kWh
Lifetime gap
8,426 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario WSMDi-405 WSMD-665
Standard test conditions 25 °C 100.0% of rated power 405 W 665 W
Cool, bright day 40 °C 94.5% of rated power 383 W 631 W
Typical summer roof 55 °C 89.0% of rated power 361 W 597 W
Hot roof 70 °C 83.6% of rated power 338 W 563 W
03

Full specification

Parameter WSMDi-405 WSMD-665 Difference
Power and efficiency
Rated power 405 Wp 665 Wp +260 W for WSMD-665
Module efficiency 20.28 % 21.29 % +1.01 pp for WSMD-665
Power density 202.8 Wp/m² 212.8 Wp/m² +10.0 Wp/m² for WSMD-665
Open-circuit voltage 45.44 V 46.58 V 1.14 V apart
Voltage at max power 38.22 V 38.10 V Effectively the same
Short-circuit current 11.40 A 18.03 A 6.63 A apart
Current at max power 10.61 A 17.46 A 6.85 A apart
Temperature
Temperature coefficient -0.365 %/°C -0.340 %/°C +0.025 %/°C for WSMD-665
Mechanical
Dimensions 1924x1038x35 mm 2400x1302x35 mm 1924x1038x35 mm vs 2400x1302x35 mm
Module area 1.997 m² 3.125 m² 1.128 m² apart
Weight 22.0 kg 34.5 kg -12.5 kg for WSMDi-405
Weight per kWp 54.3 kg/kWp 51.9 kg/kWp -2.4 kg/kWp for WSMD-665
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
#11,853 vs #8,708
WSMD-665 leads by 3,145 places
Power density
#11,821 vs #8,707
WSMD-665 leads by 3,114 places
Heat behaviour
#13,045 vs #8,778
WSMD-665 leads by 4,267 places
Weight
#8,586 vs #5,294
WSMD-665 leads by 3,292 places
Warranty
#9,667 vs #9,667
Tied - the same position in the database
Overall
#11,980 vs #3,494
WSMD-665 leads by 8,486 places
05

More useful comparisons

Open the full database
Same series, other bin
Waaree WSMDi-405 vs Waaree WSMD-660
10 differences, the largest is module efficiency
Same series, other bin
Waaree WSMDi-405 vs Waaree WSMD-655
9 differences, the largest is module efficiency
Same series, other bin
Waaree WSMDi-405 vs Waaree WSMD-650
9 differences, the largest is rated power
Same series, other bin
Waaree WSMDi-405 vs Waaree WSMD-645
9 differences, the largest is rated power
Same series, other bin
Waaree WSMDi-405 vs Waaree WSMD-545
13 differences, the largest is module efficiency
Same series, other bin
Waaree WSMDi-405 vs Waaree WSMD-540
13 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: Waaree WSMDi-405 or Waaree WSMD-665?
According to our database: Waaree WSMD-665 has higher module efficiency (21.29% vs 20.28%); Waaree WSMD-665 tolerates heat better (temp coeff -0.340%/°C vs -0.365%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Waaree WSMDi-405 and Waaree WSMD-665?
Waaree WSMDi-405 has a module efficiency of 20.28%, 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 WSMDi-405 use vs Waaree WSMD-665?
Waaree WSMDi-405 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 WSMDi-405 and Waaree WSMD-665?
Waaree WSMDi-405 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.