Skip to main content
WSMD-650 vs WSMDi-405 10 of 19 identical Swap Change panels

Waaree WSMD-650 vs Waaree WSMDi-405

Waaree WSMD-650
WSMD-650
650 Wp 20.82 % PERC
Open panel page Datasheet PDF
VS
Waaree WSMDi-405
WSMDi-405
405 Wp 20.28 % PERC
Open panel page Datasheet PDF
The verdict

WSMD-650 leads on the differences that matter

The largest is rated power: 245 W more power. 10 of 19 comparable parameters are identical.

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

What actually differs

9 of 19 parameters
Parameter WSMD-650 WSMDi-405 Difference
Rated power 650 Wp 405 Wp 245 W more power
Module efficiency 20.82 % 20.28 % 0.54 pp more efficient
Temperature coefficient -0.340 %/°C -0.365 %/°C 0.025 %/°C better in heat
Weight 34.5 kg 22.0 kg 12.5 kg lighter
Short-circuit current 17.84 A 11.40 A 6.44 A apart
Module area 3.125 m² 1.997 m² 1.128 m² apart
Power density 208.0 Wp/m² 202.8 Wp/m² 5.2 Wp/m² higher
Current at max power 17.16 A 10.61 A 6.55 A apart
Dimensions 2400x1302x35 mm 1924x1038x35 mm 2400x1302x35 mm vs 1924x1038x35 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
WSMD-650
21,066 kWh
WSMDi-405
13,126 kWh
Lifetime gap
7,940 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario WSMD-650 WSMDi-405
Standard test conditions 25 °C 100.0% of rated power 650 W 405 W
Cool, bright day 40 °C 94.5% of rated power 617 W 383 W
Typical summer roof 55 °C 89.0% of rated power 584 W 361 W
Hot roof 70 °C 83.6% of rated power 551 W 338 W
03

Full specification

Parameter WSMD-650 WSMDi-405 Difference
Power and efficiency
Rated power 650 Wp 405 Wp +245 W for WSMD-650
Module efficiency 20.82 % 20.28 % +0.54 pp for WSMD-650
Power density 208.0 Wp/m² 202.8 Wp/m² +5.2 Wp/m² for WSMD-650
Open-circuit voltage 46.09 V 45.44 V Effectively the same
Voltage at max power 37.91 V 38.22 V Effectively the same
Short-circuit current 17.84 A 11.40 A 6.44 A apart
Current at max power 17.16 A 10.61 A 6.55 A apart
Temperature
Temperature coefficient -0.340 %/°C -0.365 %/°C +0.025 %/°C for WSMD-650
Mechanical
Dimensions 2400x1302x35 mm 1924x1038x35 mm 2400x1302x35 mm vs 1924x1038x35 mm
Module area 3.125 m² 1.997 m² 1.128 m² apart
Weight 34.5 kg 22.0 kg -12.5 kg for WSMDi-405
Weight per kWp 53.1 kg/kWp 54.3 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
04

Against the whole database

14,005 panels
Efficiency
#10,443 vs #11,853
WSMD-650 leads by 1,410 places
Power density
#10,477 vs #11,821
WSMD-650 leads by 1,344 places
Heat behaviour
#8,778 vs #13,045
WSMD-650 leads by 4,267 places
Weight
#6,836 vs #8,586
WSMD-650 leads by 1,750 places
Warranty
#9,667 vs #9,667
Tied - the same position in the database
Overall
#4,615 vs #11,980
WSMD-650 leads by 7,365 places
05

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-645
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
06

Written summary

07

Questions about this pairing

Which panel is better: Waaree WSMD-650 or Waaree WSMDi-405?
According to our database: Waaree WSMD-650 has higher module efficiency (20.82% vs 20.28%); Waaree WSMD-650 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 WSMD-650 and Waaree WSMDi-405?
Waaree WSMD-650 has a module efficiency of 20.82%, while Waaree WSMDi-405 is 20.28%. 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 WSMDi-405?
Waaree WSMD-650 uses PERC cells; Waaree WSMDi-405 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 WSMDi-405?
Waaree WSMD-650 has a 27 years power warranty; Waaree WSMDi-405 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.