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

Waaree WSM-390 vs Waaree WS-345

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

Full specification

Parameter WSM-390 WS-345 Difference
Power and efficiency
Rated power 390 Wp 345 Wp +45 W for WSM-390
Module efficiency 19.58 % 17.32 % +2.26 pp for WSM-390
Power density 195.9 Wp/m² 173.3 Wp/m² +22.6 Wp/m² for WSM-390
Open-circuit voltage 48.85 V 47.00 V 1.85 V apart
Voltage at max power 40.10 V 38.55 V 1.55 V apart
Short-circuit current 10.03 A 9.40 A 0.63 A apart
Current at max power 9.73 A 8.95 A 0.78 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 62.3 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 Monocrystalline Polycrystalline Monocrystalline vs Polycrystalline
Cell count 72 72 Same
Bifacial No No Same
04

Against the whole database

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

More useful comparisons

Open the full database
Same series, other bin
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-350
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

07

Questions about this pairing

Which panel is better: Waaree WSM-390 or Waaree WS-345?
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 WSM-390 and Waaree WS-345?
Waaree WSM-390 has a module efficiency of 19.58%, while Waaree WS-345 is 17.32%. 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-345?
Waaree WSM-390 uses PERC cells; Waaree WS-345 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-345?
Waaree WSM-390 has a 25 years power warranty; Waaree WS-345 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.