Waaree WS-335 vs Waaree WSM-390
VS
The verdict
WSM-390 leads on the differences that matter
The largest is module efficiency: 2.76 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
WS-335
WSM-390
Difference
Module efficiency
16.82 %
19.58 %
2.76 pp more efficient
Rated power
335 Wp
390 Wp
55 W more power
Power density
168.3 Wp/m²
195.9 Wp/m²
27.6 Wp/m² higher
Weight per kWp
64.2 kg/kWp
55.1 kg/kWp
9.1 kg/kWp lighter
Temperature coefficient
-0.386 %/°C
-0.370 %/°C
0.016 %/°C better in heat
Open-circuit voltage
46.80 V
48.85 V
2.05 V apart
Short-circuit current
9.30 A
10.03 A
0.73 A apart
Voltage at max power
38.10 V
40.10 V
2.00 V apart
Cell type
Polycrystalline
Monocrystalline
Polycrystalline vs Monocrystalline
Current at max power
8.80 A
9.73 A
0.93 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
WS-335
10,534 kWh
WSM-390
12,194 kWh
Lifetime gap
1,660 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
WS-335
WSM-390
Standard test conditions
25 °C
100.0% of rated power
335 W
390 W
Cool, bright day
40 °C
94.2% of rated power
316 W
368 W
Typical summer roof
55 °C
88.4% of rated power
296 W
347 W
Hot roof
70 °C
82.6% of rated power
277 W
325 W
03
Full specification
Parameter
WS-335
WSM-390
Difference
Power and efficiency
Rated power
335 Wp
390 Wp
+55 W for WSM-390
Module efficiency
16.82 %
19.58 %
+2.76 pp for WSM-390
Power density
168.3 Wp/m²
195.9 Wp/m²
+27.6 Wp/m² for WSM-390
Open-circuit voltage
46.80 V
48.85 V
2.05 V apart
Voltage at max power
38.10 V
40.10 V
2.00 V apart
Short-circuit current
9.30 A
10.03 A
0.73 A apart
Current at max power
8.80 A
9.73 A
0.93 A apart
Temperature
Temperature coefficient
-0.386 %/°C
-0.370 %/°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
64.2 kg/kWp
55.1 kg/kWp
-9.1 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
Polycrystalline
Monocrystalline
Polycrystalline vs Monocrystalline
Cell count
72
72
Same
Bifacial
No
No
Same
04
14,129 panels
Against the whole database
Efficiency
#13,611
vs
#12,711
WSM-390 leads by 900 places
Power density
#13,608
vs
#12,682
WSM-390 leads by 926 places
Heat behaviour
#13,565
vs
#13,161
WSM-390 leads by 404 places
Weight
#13,071
vs
#9,637
WSM-390 leads by 3,434 places
Warranty
#9,912
vs
#9,912
Tied - the same position in the database
Overall
#13,529
vs
#12,732
WSM-390 leads by 797 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 WS-335 or Waaree WSM-390?
According to our database: Waaree WSM-390 has higher module efficiency (19.58% vs 16.82%); 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 WS-335 and Waaree WSM-390?
Waaree WS-335 has a module efficiency of 16.82%, while Waaree WSM-390 is 19.58%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Waaree WS-335 use vs Waaree WSM-390?
Waaree WS-335 uses Polycrystalline cells; Waaree WSM-390 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 WS-335 and Waaree WSM-390?
Waaree WS-335 has a 25 years power warranty; Waaree WSM-390 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.