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WSMDi-405 vs WSMD-540 6 of 19 identical Swap Change panels

Waaree WSMDi-405 vs Waaree WSMD-540

Waaree WSMDi-405
WSMDi-405
405 Wp 20.28 % PERC
Open panel page Datasheet PDF
VS
Waaree WSMD-540
WSMD-540
540 Wp 20.98 % PERC
Open panel page Datasheet PDF
The verdict

WSMD-540 leads on the differences that matter

The largest is module efficiency: 0.70 pp more efficient. 6 of 19 comparable parameters are identical.

See all 13 differences
How alike are they
6 of 19 comparable
parameters are identical
identical differs
01

What actually differs

13 of 19 parameters
Parameter WSMDi-405 WSMD-540 Difference
Module efficiency 20.28 % 20.98 % 0.70 pp more efficient
Rated power 405 Wp 540 Wp 135 W more power
Weight 22.0 kg 27.5 kg 5.5 kg lighter
Power density 202.8 Wp/m² 209.8 Wp/m² 7.0 Wp/m² higher
Open-circuit voltage 45.44 V 49.61 V 4.17 V apart
Short-circuit current 11.40 A 13.83 A 2.43 A apart
Module area 1.997 m² 2.574 m² 0.577 m² apart
Temperature coefficient -0.365 %/°C -0.350 %/°C 0.015 %/°C better in heat
Weight per kWp 54.3 kg/kWp 50.9 kg/kWp 3.4 kg/kWp lighter
Current at max power 10.61 A 12.95 A 2.34 A apart
Cell count 132 144 12 cells apart
Voltage at max power 38.22 V 41.75 V 3.53 V apart
Dimensions 1924x1038x35 mm 2272x1133x35 mm 1924x1038x35 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
WSMDi-405
13,126 kWh
WSMD-540
17,501 kWh
Lifetime gap
4,375 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario WSMDi-405 WSMD-540
Standard test conditions 25 °C 100.0% of rated power 405 W 540 W
Cool, bright day 40 °C 94.5% of rated power 383 W 512 W
Typical summer roof 55 °C 89.0% of rated power 361 W 483 W
Hot roof 70 °C 83.6% of rated power 338 W 455 W
03

Full specification

Parameter WSMDi-405 WSMD-540 Difference
Power and efficiency
Rated power 405 Wp 540 Wp +135 W for WSMD-540
Module efficiency 20.28 % 20.98 % +0.70 pp for WSMD-540
Power density 202.8 Wp/m² 209.8 Wp/m² +7.0 Wp/m² for WSMD-540
Open-circuit voltage 45.44 V 49.61 V 4.17 V apart
Voltage at max power 38.22 V 41.75 V 3.53 V apart
Short-circuit current 11.40 A 13.83 A 2.43 A apart
Current at max power 10.61 A 12.95 A 2.34 A apart
Temperature
Temperature coefficient -0.365 %/°C -0.350 %/°C +0.015 %/°C for WSMD-540
Mechanical
Dimensions 1924x1038x35 mm 2272x1133x35 mm 1924x1038x35 mm vs 2272x1133x35 mm
Module area 1.997 m² 2.574 m² 0.577 m² apart
Weight 22.0 kg 27.5 kg -5.5 kg for WSMDi-405
Weight per kWp 54.3 kg/kWp 50.9 kg/kWp -3.4 kg/kWp for WSMD-540
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
#11,853 vs #9,963
WSMD-540 leads by 1,890 places
Power density
#11,821 vs #9,905
WSMD-540 leads by 1,916 places
Heat behaviour
#13,045 vs #10,419
WSMD-540 leads by 2,626 places
Weight
#8,586 vs #4,303
WSMD-540 leads by 4,283 places
Warranty
#9,667 vs #9,667
Tied - the same position in the database
Overall
#11,980 vs #8,328
WSMD-540 leads by 3,652 places
05

More useful comparisons

Open the full database
Same series, other bin
Waaree WSMDi-405 vs Waaree WSMD-665
11 differences, the largest is module efficiency
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
06

Written summary

07

Questions about this pairing

Which panel is better: Waaree WSMDi-405 or Waaree WSMD-540?
According to our database: Waaree WSMD-540 has higher module efficiency (20.98% vs 20.28%); Waaree WSMD-540 tolerates heat better (temp coeff -0.350%/°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-540?
Waaree WSMDi-405 has a module efficiency of 20.28%, while Waaree WSMD-540 is 20.98%. 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-540?
Waaree WSMDi-405 uses PERC cells; Waaree WSMD-540 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-540?
Waaree WSMDi-405 has a 27 years power warranty; Waaree WSMD-540 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.