Waaree WSM-390 vs Waaree WS-350
VS
The verdict
WSM-390 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 differencesHow alike are they
8
of 18 comparable
parameters are identical
parameters are identical
identical
differs
not published
01
10 of 18 parameters
What actually differs
Parameter
WSM-390
WS-350
Difference
Module efficiency
19.58 %
17.57 %
2.01 pp more efficient
Rated power
390 Wp
350 Wp
40 W more power
Power density
195.9 Wp/m²
175.8 Wp/m²
20.1 Wp/m² higher
Weight per kWp
55.1 kg/kWp
61.4 kg/kWp
6.3 kg/kWp lighter
Temperature coefficient
-0.370 %/°C
-0.386 %/°C
0.016 %/°C better in heat
Open-circuit voltage
48.85 V
47.10 V
1.75 V apart
Short-circuit current
10.03 A
9.45 A
0.58 A apart
Cell type
Monocrystalline
Polycrystalline
Monocrystalline vs Polycrystalline
Current at max power
9.73 A
9.00 A
0.73 A apart
Voltage at max power
40.10 V
38.90 V
1.20 V 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-390
12,194 kWh
WS-350
11,006 kWh
Lifetime gap
1,188 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
WSM-390
WS-350
Standard test conditions
25 °C
100.0% of rated power
390 W
350 W
Cool, bright day
40 °C
94.2% of rated power
368 W
330 W
Typical summer roof
55 °C
88.4% of rated power
347 W
309 W
Hot roof
70 °C
82.6% of rated power
325 W
289 W
03
Full specification
Parameter
WSM-390
WS-350
Difference
Power and efficiency
Rated power
390 Wp
350 Wp
+40 W for WSM-390
Module efficiency
19.58 %
17.57 %
+2.01 pp for WSM-390
Power density
195.9 Wp/m²
175.8 Wp/m²
+20.1 Wp/m² for WSM-390
Open-circuit voltage
48.85 V
47.10 V
1.75 V apart
Voltage at max power
40.10 V
38.90 V
1.20 V apart
Short-circuit current
10.03 A
9.45 A
0.58 A apart
Current at max power
9.73 A
9.00 A
0.73 A apart
Temperature
Temperature coefficient
-0.370 %/°C
-0.386 %/°C
+0.016 %/°C for WSM-390
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
55.1 kg/kWp
61.4 kg/kWp
-6.3 kg/kWp for WSM-390
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
14,129 panels
Against the whole database
Efficiency
#12,711
vs
#13,435
WSM-390 leads by 724 places
Power density
#12,682
vs
#13,416
WSM-390 leads by 734 places
Heat behaviour
#13,161
vs
#13,565
WSM-390 leads by 404 places
Weight
#9,637
vs
#12,739
WSM-390 leads by 3,102 places
Warranty
#9,912
vs
#9,912
Tied - the same position in the database
Overall
#12,732
vs
#13,359
WSM-390 leads by 627 places
05
Open the full database
More useful comparisons
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Waaree WSM-390 vs Waaree WSM-395
One difference: module efficiency
Same series, other bin
Waaree WSM-390 vs Waaree WSM-385
One difference: module efficiency
Same series, other bin
Waaree WSM-390 vs Waaree WSM-380
3 differences, the largest is module efficiency
Same series, other bin
Waaree WSM-390 vs Waaree WS-345
10 differences, the largest is module efficiency
Same series, other bin
Waaree WSM-390 vs Waaree WS-340
10 differences, the largest is module efficiency
Same series, other bin
Waaree WSM-390 vs Waaree WS-335
10 differences, the largest is module efficiency
06
Written summary
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07
Questions about this pairing
Which panel is better: Waaree WSM-390 or Waaree WS-350?
According to our database: Waaree WSM-390 has higher module efficiency (19.58% vs 17.57%); Waaree WSM-390 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-390 and Waaree WS-350?
Waaree WSM-390 has a module efficiency of 19.58%, while Waaree WS-350 is 17.57%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Waaree WSM-390 use vs Waaree WS-350?
Waaree WSM-390 uses PERC cells; Waaree WS-350 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-390 and Waaree WS-350?
Waaree WSM-390 has a 25 years power warranty; Waaree WS-350 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.