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400R vs 390R 14 of 17 identical Swap Change panels

Solaria Solaria PowerX-400R vs Solaria Solaria PowerX-390R

Solaria
Solaria PowerX-400R
400 Wp 20.50 %
Open panel page Datasheet PDF
VS
Solaria
Solaria PowerX-390R
390 Wp 20.00 %
Open panel page Datasheet PDF
The verdict

400R leads on the differences that matter

The largest is module efficiency: 0.50 pp more efficient. 14 of 17 comparable parameters are identical, with 2 more left out because at least one datasheet does not publish them.

See all 3 differences
How alike are they
14 of 17 comparable
parameters are identical
identical differs not published
01

What actually differs

3 of 17 parameters
Parameter 400R 390R Difference
Module efficiency 20.50 % 20.00 % 0.50 pp more efficient
Power density 204.7 Wp/m² 199.6 Wp/m² 5.1 Wp/m² higher
Rated power 400 Wp 390 Wp 10 W more power
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 (-0.360 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
400R
13,068 kWh
390R
12,741 kWh
Lifetime gap
327 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 400R 390R
Standard test conditions 25 °C 100.0% of rated power 400 W 390 W
Cool, bright day 40 °C 94.6% of rated power 378 W 369 W
Typical summer roof 55 °C 89.2% of rated power 357 W 348 W
Hot roof 70 °C 83.8% of rated power 335 W 327 W
03

Full specification

Parameter 400R 390R Difference
Power and efficiency
Rated power 400 Wp 390 Wp +10 W for 400R
Module efficiency 20.50 % 20.00 % +0.50 pp for 400R
Power density 204.7 Wp/m² 199.6 Wp/m² +5.1 Wp/m² for 400R
Open-circuit voltage 37.30 V 36.90 V Effectively the same
Voltage at max power 31.00 V 30.60 V Effectively the same
Short-circuit current 13.68 A 13.52 A Effectively the same
Current at max power 12.90 A 12.73 A Effectively the same
Temperature
Temperature coefficient -0.360 %/°C -0.360 %/°C Same
Mechanical
Dimensions 1723x1134x35 mm 1723x1134x35 mm Same
Module area 1.954 m² 1.954 m² Same
Weight 22.1 kg 22.1 kg Same
Weight per kWp 55.2 kg/kWp 56.7 kg/kWp Effectively the same
Warranty and degradation
Product warranty 25 yrs 25 yrs Same
Performance warranty 25 yrs 25 yrs Same
Annual degradation 0.50 %/yr 0.50 %/yr Same
Technology
Cell technology - - Neither datasheet publishes this
Cell type Monocrystalline Monocrystalline Same
Cell count - - Neither datasheet publishes this
Bifacial No No Same
04

Against the whole database

14,005 panels
Efficiency
#11,308 vs #12,214
400R leads by 906 places
Power density
#11,499 vs #12,284
400R leads by 785 places
Heat behaviour
#12,345 vs #12,345
Tied - the same position in the database
Weight
#9,691 vs #10,801
400R leads by 1,110 places
Warranty
#9,798 vs #9,798
Tied - the same position in the database
Overall
#10,732 vs #11,244
400R leads by 512 places
05

More useful comparisons

Open the full database
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Solaria Solaria PowerX-400R vs Solaria SPV680-TG12-132BD
14 differences, the largest is module efficiency
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Solaria Solaria PowerX-400R vs Solaria SPV675-TG12-132BD
14 differences, the largest is module efficiency
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Solaria Solaria PowerX-400R vs Solaria SPV670-TG12-132BD
14 differences, the largest is module efficiency
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Solaria Solaria PowerX-400R vs Solaria SPV665-TG12-132BD
14 differences, the largest is module efficiency
Same manufacturer
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Solaria Solaria PowerX-400R vs Solaria SPV660-TG12-132BD
15 differences, the largest is temperature coefficient
06

Written summary

07

Questions about this pairing

Which panel is better: Solaria Solaria PowerX-400R or Solaria Solaria PowerX-390R?
According to our database: Solaria Solaria PowerX-400R has higher module efficiency (20.50% vs 20.00%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Solaria Solaria PowerX-400R and Solaria Solaria PowerX-390R?
Solaria Solaria PowerX-400R has a module efficiency of 20.50%, while Solaria Solaria PowerX-390R is 20.00%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Solaria Solaria PowerX-400R use vs Solaria Solaria PowerX-390R?
Solaria Solaria PowerX-400R uses Monocrystalline cells; Solaria Solaria PowerX-390R uses Monocrystalline. 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 Solaria Solaria PowerX-400R and Solaria Solaria PowerX-390R?
Solaria Solaria PowerX-400R has a 25 years power warranty; Solaria Solaria PowerX-390R 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.

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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.