Solaria Solaria PowerX-400R vs Solaria PowerXT 420R-PL
VS
The verdict
13 differences, and they point both ways
The largest is performance warranty: 5 yrs longer. 4 of 17 comparable parameters are identical, with 2 more left out because at least one datasheet does not publish them.
See all 13 differencesHow alike are they
4
of 17 comparable
parameters are identical
parameters are identical
identical
differs
not published
01
13 of 17 parameters
What actually differs
Parameter
Solaria PowerX-400R
PowerXT 420R-PL
Difference
Performance warranty
25 yrs
30 yrs
5 yrs longer
Module efficiency
20.50 %
19.90 %
0.60 pp more efficient
Temperature coefficient
-0.360 %/°C
-0.390 %/°C
0.030 %/°C better in heat
Product warranty
25 yrs
30 yrs
5 yrs longer
Rated power
400 Wp
420 Wp
20 W more power
Open-circuit voltage
37.30 V
45.70 V
8.40 V apart
Short-circuit current
13.68 A
11.60 A
2.08 A apart
Module area
1.954 m²
2.112 m²
0.158 m² apart
Power density
204.7 Wp/m²
198.9 Wp/m²
5.8 Wp/m² higher
Weight per kWp
55.2 kg/kWp
51.7 kg/kWp
3.6 kg/kWp lighter
Voltage at max power
31.00 V
37.90 V
6.90 V apart
Current at max power
12.90 A
11.09 A
1.81 A apart
Dimensions
1723x1134x35 mm
1957x1079x35 mm
1723x1134x35 mm vs 1957x1079x35 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
Solaria PowerX-400R
13,068 kWh
PowerXT 420R-PL
13,765 kWh
Lifetime gap
697 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
Solaria PowerX-400R
PowerXT 420R-PL
Standard test conditions
25 °C
100.0% of rated power
400 W
420 W
Cool, bright day
40 °C
94.2% of rated power
378 W
395 W
Typical summer roof
55 °C
88.3% of rated power
357 W
371 W
Hot roof
70 °C
82.5% of rated power
335 W
346 W
03
Full specification
Parameter
Solaria PowerX-400R
PowerXT 420R-PL
Difference
Power and efficiency
Rated power
400 Wp
420 Wp
+20 W for PowerXT 420R-PL
Module efficiency
20.50 %
19.90 %
+0.60 pp for Solaria PowerX-400R
Power density
204.7 Wp/m²
198.9 Wp/m²
+5.8 Wp/m² for Solaria PowerX-400R
Open-circuit voltage
37.30 V
45.70 V
8.40 V apart
Voltage at max power
31.00 V
37.90 V
6.90 V apart
Short-circuit current
13.68 A
11.60 A
2.08 A apart
Current at max power
12.90 A
11.09 A
1.81 A apart
Temperature
Temperature coefficient
-0.360 %/°C
-0.390 %/°C
+0.030 %/°C for Solaria PowerX-400R
Mechanical
Dimensions
1723x1134x35 mm
1957x1079x35 mm
1723x1134x35 mm vs 1957x1079x35 mm
Module area
1.954 m²
2.112 m²
0.158 m² apart
Weight
22.1 kg
21.7 kg
Effectively the same
Weight per kWp
55.2 kg/kWp
51.7 kg/kWp
-3.6 kg/kWp for PowerXT 420R-PL
Warranty and degradation
Product warranty
25 yrs
30 yrs
+5 yrs for PowerXT 420R-PL
Performance warranty
25 yrs
30 yrs
+5 yrs for PowerXT 420R-PL
Annual degradation
0.50 %/yr
0.48 %/yr
Effectively the same
Technology
Cell technology
-
-
Neither datasheet publishes this
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
-
-
Neither datasheet publishes this
Bifacial
No
No
Same
04
14,005 panels
Against the whole database
Efficiency
#11,308
vs
#12,331
Solaria PowerX-400R leads by 1,023 places
Power density
#11,499
vs
#12,344
Solaria PowerX-400R leads by 845 places
Heat behaviour
#12,345
vs
#13,579
Solaria PowerX-400R leads by 1,234 places
Weight
#9,691
vs
#5,023
PowerXT 420R-PL leads by 4,668 places
Warranty
#9,798
vs
#21
PowerXT 420R-PL leads by 9,777 places
Overall
#10,732
vs
#9,324
PowerXT 420R-PL leads by 1,408 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: Solaria Solaria PowerX-400R or Solaria PowerXT 420R-PL?
According to our database: Solaria Solaria PowerX-400R has higher module efficiency (20.50% vs 19.90%); Solaria Solaria PowerX-400R tolerates heat better (temp coeff -0.360%/°C vs -0.390%/°C). 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 PowerXT 420R-PL?
Solaria Solaria PowerX-400R has a module efficiency of 20.50%, while Solaria PowerXT 420R-PL is 19.90%. 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 PowerXT 420R-PL?
Solaria Solaria PowerX-400R uses Monocrystalline cells; Solaria PowerXT 420R-PL 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 PowerXT 420R-PL?
Solaria Solaria PowerX-400R has a 25 years power warranty; Solaria PowerXT 420R-PL has a 30 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 1 Solaria offer
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.