Maxeon SPR-MAX3-390-COM vs Maxeon SPR-MAX3-400-COM
VS
The verdict
400-COM leads on the differences that matter
The largest is module efficiency: 0.50 pp more efficient. 15 of 19 comparable parameters are identical.
See all 4 differencesHow alike are they
15
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
4 of 19 parameters
What actually differs
Parameter
390-COM
400-COM
Difference
Module efficiency
22.10 %
22.60 %
0.50 pp more efficient
Power density
220.6 Wp/m²
226.3 Wp/m²
5.7 Wp/m² higher
Rated power
390 Wp
400 Wp
10 W more power
Voltage at max power
64.50 V
66.00 V
1.50 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
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
400-COM
13,590 kWh
Lifetime gap
340 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
390-COM
400-COM
Standard test conditions
25 °C
100.0% of rated power
390 W
400 W
Cool, bright day
40 °C
96.0% of rated power
374 W
384 W
Typical summer roof
55 °C
91.9% of rated power
358 W
368 W
Hot roof
70 °C
87.8% of rated power
343 W
351 W
03
Full specification
Parameter
390-COM
400-COM
Difference
Power and efficiency
Rated power
390 Wp
400 Wp
+10 W for 400-COM
Module efficiency
22.10 %
22.60 %
+0.50 pp for 400-COM
Power density
220.6 Wp/m²
226.3 Wp/m²
+5.7 Wp/m² for 400-COM
Open-circuit voltage
75.30 V
75.40 V
Effectively the same
Voltage at max power
64.50 V
66.00 V
1.50 V apart
Short-circuit current
6.55 A
6.57 A
Effectively the same
Current at max power
6.05 A
6.07 A
Effectively the same
Temperature
Temperature coefficient
-0.270 %/°C
-0.270 %/°C
Same
Mechanical
Dimensions
1690x1046x40 mm
1690x1046x40 mm
Same
Module area
1.768 m²
1.768 m²
Same
Weight
19.0 kg
19.0 kg
Same
Weight per kWp
48.7 kg/kWp
47.5 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
104
Same
Bifacial
No
No
Same
04
14,005 panels
Against the whole database
Efficiency
#6,012
vs
#3,658
400-COM leads by 2,354 places
Power density
#6,156
vs
#3,671
400-COM leads by 2,485 places
Heat behaviour
#1,280
vs
#1,280
Tied - the same position in the database
Weight
#2,430
vs
#1,726
400-COM leads by 704 places
Warranty
#1
vs
#1
Tied - the same position in the database
Overall
#3,453
vs
#2,534
400-COM leads by 919 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-MAX3-400-COM?
According to our database: Maxeon SPR-MAX3-400-COM has higher module efficiency (22.60% 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-MAX3-400-COM?
Maxeon SPR-MAX3-390-COM has a module efficiency of 22.10%, while Maxeon SPR-MAX3-400-COM is 22.60%. 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-MAX3-400-COM?
Maxeon SPR-MAX3-390-COM uses Back Contact cells; Maxeon SPR-MAX3-400-COM 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-MAX3-400-COM?
Maxeon SPR-MAX3-390-COM has a 40 years power warranty; Maxeon SPR-MAX3-400-COM 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.