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WS-345 vs WSM-390 8 of 18 identical Swap Change panels

Waaree WS-345 vs Waaree WSM-390

WS-345
345 Wp 17.32 %
Open panel page Datasheet PDF
VS
WSM-390
390 Wp 19.58 % PERC
Open panel page Datasheet PDF
The verdict

WSM-390 leads on the differences that matter

The largest is module efficiency: 2.26 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 WS-345 WSM-390 Difference
Module efficiency 17.32 % 19.58 % 2.26 pp more efficient
Rated power 345 Wp 390 Wp 45 W more power
Power density 173.3 Wp/m² 195.9 Wp/m² 22.6 Wp/m² higher
Weight per kWp 62.3 kg/kWp 55.1 kg/kWp 7.2 kg/kWp lighter
Temperature coefficient -0.386 %/°C -0.370 %/°C 0.016 %/°C better in heat
Open-circuit voltage 47.00 V 48.85 V 1.85 V apart
Short-circuit current 9.40 A 10.03 A 0.63 A apart
Cell type Polycrystalline Monocrystalline Polycrystalline vs Monocrystalline
Current at max power 8.95 A 9.73 A 0.78 A apart
Voltage at max power 38.55 V 40.10 V 1.55 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
WS-345
10,849 kWh
WSM-390
12,194 kWh
Lifetime gap
1,345 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario WS-345 WSM-390
Standard test conditions 25 °C 100.0% of rated power 345 W 390 W
Cool, bright day 40 °C 94.2% of rated power 325 W 368 W
Typical summer roof 55 °C 88.4% of rated power 305 W 347 W
Hot roof 70 °C 82.6% of rated power 285 W 325 W
03

Full specification

Parameter WS-345 WSM-390 Difference
Power and efficiency
Rated power 345 Wp 390 Wp +45 W for WSM-390
Module efficiency 17.32 % 19.58 % +2.26 pp for WSM-390
Power density 173.3 Wp/m² 195.9 Wp/m² +22.6 Wp/m² for WSM-390
Open-circuit voltage 47.00 V 48.85 V 1.85 V apart
Voltage at max power 38.55 V 40.10 V 1.55 V apart
Short-circuit current 9.40 A 10.03 A 0.63 A apart
Current at max power 8.95 A 9.73 A 0.78 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 62.3 kg/kWp 55.1 kg/kWp -7.2 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

Against the whole database

14,129 panels
Efficiency
#13,493 vs #12,711
WSM-390 leads by 782 places
Power density
#13,481 vs #12,682
WSM-390 leads by 799 places
Heat behaviour
#13,565 vs #13,161
WSM-390 leads by 404 places
Weight
#12,859 vs #9,637
WSM-390 leads by 3,222 places
Warranty
#9,912 vs #9,912
Tied - the same position in the database
Overall
#13,418 vs #12,732
WSM-390 leads by 686 places
05

More useful comparisons

Open the full database
Same series, other bin
Waaree WS-345 vs Waaree WSM-395
10 differences, the largest is module efficiency
Same series, other bin
Waaree WS-345 vs Waaree WSM-385
10 differences, the largest is module efficiency
Same series, other bin
Waaree WS-345 vs Waaree WSM-380
10 differences, the largest is module efficiency
Same series, other bin
Waaree WS-345 vs Waaree WS-350
One difference: module efficiency
Same series, other bin
Waaree WS-345 vs Waaree WS-340
One difference: module efficiency
Same series, other bin
Waaree WS-345 vs Waaree WS-335
3 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: Waaree WS-345 or Waaree WSM-390?
According to our database: Waaree WSM-390 has higher module efficiency (19.58% vs 17.32%); 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-345 and Waaree WSM-390?
Waaree WS-345 has a module efficiency of 17.32%, 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-345 use vs Waaree WSM-390?
Waaree WS-345 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-345 and Waaree WSM-390?
Waaree WS-345 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.