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390-COM vs 380-COM 15 of 19 identical Swap Change panels

Maxeon SPR-MAX3-390-COM vs Maxeon SPR-MAX3-380-COM

Maxeon SPR-MAX3-390-COM
Maxeon
SPR-MAX3-390-COM
390 Wp 22.10 % Back Contact
Open panel page Datasheet PDF
VS
Maxeon SPR-MAX3-380-COM
Maxeon
SPR-MAX3-380-COM
380 Wp 21.50 % Back Contact
Open panel page Datasheet PDF
The verdict

390-COM leads on the differences that matter

The largest is module efficiency: 0.60 pp more efficient. 15 of 19 comparable parameters are identical.

See all 4 differences
How alike are they
15 of 19 comparable
parameters are identical
identical differs
01

What actually differs

4 of 19 parameters
Parameter 390-COM 380-COM Difference
Module efficiency 22.10 % 21.50 % 0.60 pp more efficient
Power density 220.6 Wp/m² 215.0 Wp/m² 5.7 Wp/m² higher
Rated power 390 Wp 380 Wp 10 W more power
Voltage at max power 64.50 V 63.10 V 1.40 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
380-COM
12,910 kWh
Lifetime gap
340 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 390-COM 380-COM
Standard test conditions 25 °C 100.0% of rated power 390 W 380 W
Cool, bright day 40 °C 96.0% of rated power 374 W 365 W
Typical summer roof 55 °C 91.9% of rated power 358 W 349 W
Hot roof 70 °C 87.8% of rated power 343 W 334 W
03

Full specification

Parameter 390-COM 380-COM Difference
Power and efficiency
Rated power 390 Wp 380 Wp +10 W for 390-COM
Module efficiency 22.10 % 21.50 % +0.60 pp for 390-COM
Power density 220.6 Wp/m² 215.0 Wp/m² +5.7 Wp/m² for 390-COM
Open-circuit voltage 75.30 V 75.20 V Effectively the same
Voltage at max power 64.50 V 63.10 V 1.40 V apart
Short-circuit current 6.55 A 6.54 A Effectively the same
Current at max power 6.05 A 6.02 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 50.0 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

Against the whole database

14,005 panels
Efficiency
#6,012 vs #7,958
390-COM leads by 1,946 places
Power density
#6,156 vs #8,017
390-COM leads by 1,861 places
Heat behaviour
#1,280 vs #1,280
Tied - the same position in the database
Weight
#2,430 vs #3,317
390-COM leads by 887 places
Warranty
#1 vs #1
Tied - the same position in the database
Overall
#3,453 vs #4,475
390-COM leads by 1,022 places
05

More useful comparisons

Open the full database
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Maxeon SPR-MAX3-390-COM vs Maxeon SPR-MAX3-430-R
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Maxeon SPR-MAX3-390-COM vs Maxeon SPR-MAX3-425-R
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Maxeon SPR-MAX3-390-COM vs Maxeon SPR-MAX3-415-R
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Maxeon SPR-MAX3-390-COM vs Maxeon SPR-MAX3-400-COM
4 differences, the largest is module efficiency
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Maxeon SPR-MAX3-390-COM vs Maxeon SPR-MAX3-375-BLK
3 differences, the largest is module efficiency
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Maxeon SPR-MAX3-390-COM vs Maxeon SPR-MAX3-370-COM
7 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: Maxeon SPR-MAX3-390-COM or Maxeon SPR-MAX3-380-COM?
According to our database: Maxeon SPR-MAX3-390-COM has higher module efficiency (22.10% vs 21.50%). 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-MAX3-380-COM?
Maxeon SPR-MAX3-390-COM has a module efficiency of 22.10%, while Maxeon SPR-MAX3-380-COM is 21.50%. 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-MAX3-380-COM?
Maxeon SPR-MAX3-390-COM uses Back Contact cells; Maxeon SPR-MAX3-380-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-MAX3-380-COM?
Maxeon SPR-MAX3-390-COM has a 40 years power warranty; Maxeon SPR-MAX3-380-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.