Maxeon SPR-MAX3-390-COM vs Maxeon SPR-MAX3-425-R
VS
The verdict
425-R leads on the differences that matter
The largest is rated power: 35 W more power. 8 of 19 comparable parameters are identical.
See all 11 differencesHow alike are they
8
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
11 of 19 parameters
What actually differs
Parameter
390-COM
425-R
Difference
Rated power
390 Wp
425 Wp
35 W more power
Open-circuit voltage
75.30 V
40.70 V
34.60 V apart
Short-circuit current
6.55 A
13.13 A
6.58 A apart
Module area
1.768 m²
1.895 m²
0.128 m² apart
Module efficiency
22.10 %
22.40 %
0.30 pp more efficient
Weight
19.0 kg
21.2 kg
2.2 kg lighter
Power density
220.6 Wp/m²
224.2 Wp/m²
3.6 Wp/m² higher
Voltage at max power
64.50 V
34.90 V
29.60 V apart
Current at max power
6.05 A
12.18 A
6.13 A apart
Cell count
104
112
8 cells apart
Dimensions
1690x1046x40 mm
1812x1046x40 mm
1690x1046x40 mm vs 1812x1046x40 mm
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
Same temp coeff. for both panels (-0.270 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
390-COM
13,250 kWh
425-R
14,439 kWh
Lifetime gap
1,189 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
390-COM
425-R
Standard test conditions
25 °C
100.0% of rated power
390 W
425 W
Cool, bright day
40 °C
96.0% of rated power
374 W
408 W
Typical summer roof
55 °C
91.9% of rated power
358 W
391 W
Hot roof
70 °C
87.8% of rated power
343 W
373 W
03
Full specification
Parameter
390-COM
425-R
Difference
Power and efficiency
Rated power
390 Wp
425 Wp
+35 W for 425-R
Module efficiency
22.10 %
22.40 %
+0.30 pp for 425-R
Power density
220.6 Wp/m²
224.2 Wp/m²
+3.6 Wp/m² for 425-R
Open-circuit voltage
75.30 V
40.70 V
34.60 V apart
Voltage at max power
64.50 V
34.90 V
29.60 V apart
Short-circuit current
6.55 A
13.13 A
6.58 A apart
Current at max power
6.05 A
12.18 A
6.13 A apart
Temperature
Temperature coefficient
-0.270 %/°C
-0.270 %/°C
Same
Mechanical
Dimensions
1690x1046x40 mm
1812x1046x40 mm
1690x1046x40 mm vs 1812x1046x40 mm
Module area
1.768 m²
1.895 m²
0.128 m² apart
Weight
19.0 kg
21.2 kg
-2.2 kg for 390-COM
Weight per kWp
48.7 kg/kWp
49.9 kg/kWp
Effectively the same
Warranty and degradation
Product warranty
40 yrs
40 yrs
Same
Performance warranty
40 yrs
40 yrs
Same
Annual degradation
0.25 %/yr
0.25 %/yr
Same
Technology
Cell technology
Back Contact
Back Contact
Same
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
104
112
8 cells apart
Bifacial
No
No
Same
04
14,005 panels
Against the whole database
Efficiency
#6,012
vs
#4,774
425-R leads by 1,238 places
Power density
#6,156
vs
#4,759
425-R leads by 1,397 places
Heat behaviour
#1,280
vs
#1,280
Tied - the same position in the database
Weight
#2,430
vs
#3,266
390-COM leads by 836 places
Warranty
#1
vs
#1
Tied - the same position in the database
Overall
#3,453
vs
#2,122
425-R leads by 1,331 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: Maxeon SPR-MAX3-390-COM or Maxeon SPR-MAX3-425-R?
According to our database: Maxeon SPR-MAX3-425-R has higher module efficiency (22.40% vs 22.10%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Maxeon SPR-MAX3-390-COM and Maxeon SPR-MAX3-425-R?
Maxeon SPR-MAX3-390-COM has a module efficiency of 22.10%, while Maxeon SPR-MAX3-425-R is 22.40%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Maxeon SPR-MAX3-390-COM use vs Maxeon SPR-MAX3-425-R?
Maxeon SPR-MAX3-390-COM uses Back Contact cells; Maxeon SPR-MAX3-425-R uses Back Contact. 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 Maxeon SPR-MAX3-390-COM and Maxeon SPR-MAX3-425-R?
Maxeon SPR-MAX3-390-COM has a 40 years power warranty; Maxeon SPR-MAX3-425-R has a 40 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 26 Maxeon 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.