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WSM-380 vs WS-340 8 of 18 identical Swap Change panels

Waaree WSM-380 vs Waaree WS-340

WSM-380
380 Wp 19.08 % PERC
Open panel page Datasheet PDF
VS
WS-340
340 Wp 17.07 %
Open panel page Datasheet PDF
The verdict

WSM-380 leads on the differences that matter

The largest is module efficiency: 2.01 pp more efficient. 8 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.

See all 10 differences
How alike are they
8 of 18 comparable
parameters are identical
identical differs not published
01

What actually differs

10 of 18 parameters
Parameter WSM-380 WS-340 Difference
Module efficiency 19.08 % 17.07 % 2.01 pp more efficient
Rated power 380 Wp 340 Wp 40 W more power
Power density 190.9 Wp/m² 170.8 Wp/m² 20.1 Wp/m² higher
Weight per kWp 56.6 kg/kWp 63.2 kg/kWp 6.7 kg/kWp lighter
Temperature coefficient -0.370 %/°C -0.386 %/°C 0.016 %/°C better in heat
Open-circuit voltage 48.45 V 46.90 V 1.55 V apart
Short-circuit current 9.90 A 9.35 A 0.55 A apart
Cell type Monocrystalline Polycrystalline Monocrystalline vs Polycrystalline
Voltage at max power 39.70 V 38.25 V 1.45 V apart
Current at max power 9.58 A 8.90 A 0.68 A apart
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
WSM-380
11,881 kWh
WS-340
10,692 kWh
Lifetime gap
1,189 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario WSM-380 WS-340
Standard test conditions 25 °C 100.0% of rated power 380 W 340 W
Cool, bright day 40 °C 94.2% of rated power 359 W 320 W
Typical summer roof 55 °C 88.4% of rated power 338 W 301 W
Hot roof 70 °C 82.6% of rated power 317 W 281 W
03

Full specification

Parameter WSM-380 WS-340 Difference
Power and efficiency
Rated power 380 Wp 340 Wp +40 W for WSM-380
Module efficiency 19.08 % 17.07 % +2.01 pp for WSM-380
Power density 190.9 Wp/m² 170.8 Wp/m² +20.1 Wp/m² for WSM-380
Open-circuit voltage 48.45 V 46.90 V 1.55 V apart
Voltage at max power 39.70 V 38.25 V 1.45 V apart
Short-circuit current 9.90 A 9.35 A 0.55 A apart
Current at max power 9.58 A 8.90 A 0.68 A apart
Temperature
Temperature coefficient -0.370 %/°C -0.386 %/°C +0.016 %/°C for WSM-380
Mechanical
Dimensions 1985x1003x35 mm 1985x1003x35 mm Same
Module area 1.991 m² 1.991 m² Same
Weight 21.5 kg 21.5 kg Same
Weight per kWp 56.6 kg/kWp 63.2 kg/kWp -6.7 kg/kWp for WSM-380
Warranty and degradation
Product warranty 10 yrs 10 yrs Same
Performance warranty 25 yrs 25 yrs Same
Annual degradation 0.70 %/yr 0.70 %/yr Same
Technology
Cell technology PERC - Not published by Waaree
Cell type Monocrystalline Polycrystalline Monocrystalline vs Polycrystalline
Cell count 72 72 Same
Bifacial No No Same
04

Against the whole database

14,129 panels
Efficiency
#13,013 vs #13,554
WSM-380 leads by 541 places
Power density
#12,990 vs #13,546
WSM-380 leads by 556 places
Heat behaviour
#13,161 vs #13,565
WSM-380 leads by 404 places
Weight
#10,813 vs #12,970
WSM-380 leads by 2,157 places
Warranty
#9,912 vs #9,912
Tied - the same position in the database
Overall
#12,943 vs #13,475
WSM-380 leads by 532 places
05

More useful comparisons

Open the full database
Same series, other bin
Waaree WSM-380 vs Waaree WSM-395
4 differences, the largest is module efficiency
Same series, other bin
Waaree WSM-380 vs Waaree WSM-390
3 differences, the largest is module efficiency
Same series, other bin
Waaree WSM-380 vs Waaree WSM-385
One difference: module efficiency
Same series, other bin
Waaree WSM-380 vs Waaree WS-350
8 differences, the largest is module efficiency
Same series, other bin
Waaree WSM-380 vs Waaree WS-345
10 differences, the largest is module efficiency
Same series, other bin
Waaree WSM-380 vs Waaree WS-335
10 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: Waaree WSM-380 or Waaree WS-340?
According to our database: Waaree WSM-380 has higher module efficiency (19.08% vs 17.07%); Waaree WSM-380 tolerates heat better (temp coeff -0.370%/°C vs -0.386%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Waaree WSM-380 and Waaree WS-340?
Waaree WSM-380 has a module efficiency of 19.08%, while Waaree WS-340 is 17.07%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Waaree WSM-380 use vs Waaree WS-340?
Waaree WSM-380 uses PERC cells; Waaree WS-340 uses Polycrystalline. 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 WSM-380 and Waaree WS-340?
Waaree WSM-380 has a 25 years power warranty; Waaree WS-340 has a 25 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 25 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.