Waaree WSMDi-405 vs Waaree WSMD-645
VS
The verdict
WSMD-645 leads on the differences that matter
The largest is rated power: 240 W more power. 10 of 19 comparable parameters are identical.
See all 9 differencesHow alike are they
10
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
9 of 19 parameters
What actually differs
Parameter
WSMDi-405
WSMD-645
Difference
Rated power
405 Wp
645 Wp
240 W more power
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
Module efficiency
20.28 %
20.65 %
0.37 pp more efficient
Short-circuit current
11.40 A
17.78 A
6.38 A apart
Module area
1.997 m²
3.125 m²
1.128 m² apart
Power density
202.8 Wp/m²
206.4 Wp/m²
3.6 Wp/m² higher
Current at max power
10.61 A
17.04 A
6.43 A 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-645
20,904 kWh
Lifetime gap
7,778 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
WSMDi-405
WSMD-645
Standard test conditions
25 °C
100.0% of rated power
405 W
645 W
Cool, bright day
40 °C
94.5% of rated power
383 W
612 W
Typical summer roof
55 °C
89.0% of rated power
361 W
579 W
Hot roof
70 °C
83.6% of rated power
338 W
546 W
03
Full specification
Parameter
WSMDi-405
WSMD-645
Difference
Power and efficiency
Rated power
405 Wp
645 Wp
+240 W for WSMD-645
Module efficiency
20.28 %
20.65 %
+0.37 pp for WSMD-645
Power density
202.8 Wp/m²
206.4 Wp/m²
+3.6 Wp/m² for WSMD-645
Open-circuit voltage
45.44 V
45.94 V
Effectively the same
Voltage at max power
38.22 V
37.87 V
Effectively the same
Short-circuit current
11.40 A
17.78 A
6.38 A apart
Current at max power
10.61 A
17.04 A
6.43 A apart
Temperature
Temperature coefficient
-0.365 %/°C
-0.340 %/°C
+0.025 %/°C for WSMD-645
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
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
04
14,005 panels
Against the whole database
Efficiency
#11,853
vs
#11,014
WSMD-645 leads by 839 places
Power density
#11,821
vs
#11,023
WSMD-645 leads by 798 places
Heat behaviour
#13,045
vs
#8,778
WSMD-645 leads by 4,267 places
Weight
#8,586
vs
#7,451
WSMD-645 leads by 1,135 places
Warranty
#9,667
vs
#9,667
Tied - the same position in the database
Overall
#11,980
vs
#4,962
WSMD-645 leads by 7,018 places
05
Open the full database
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06
Written summary
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07
Questions about this pairing
Which panel is better: Waaree WSMDi-405 or Waaree WSMD-645?
According to our database: Waaree WSMD-645 has higher module efficiency (20.65% vs 20.28%); Waaree WSMD-645 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-645?
Waaree WSMDi-405 has a module efficiency of 20.28%, 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 WSMDi-405 use vs Waaree WSMD-645?
Waaree WSMDi-405 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 WSMDi-405 and Waaree WSMD-645?
Waaree WSMDi-405 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.