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PowerXT 420R-PL vs SPV660-TG12-132BD 4 of 16 identical Swap Change panels

Solaria PowerXT 420R-PL vs Solaria SPV660-TG12-132BD

Solaria
PowerXT 420R-PL
420 Wp 19.90 %
Open panel page Datasheet PDF
VS
Solaria
SPV660-TG12-132BD
660 Wp 21.28 % TOPCon Bifacial Incomplete
Open panel page Datasheet PDF
The verdict

SPV660-TG12-132BD leads on the differences that matter

The largest is module efficiency: 1.38 pp more efficient. 4 of 16 comparable parameters are identical, with 3 more left out because at least one datasheet does not publish them.

See all 12 differences
How alike are they
4 of 16 comparable
parameters are identical
identical differs not published
01

What actually differs

12 of 16 parameters
Parameter PowerXT 420R-PL SPV660-TG12-132BD Difference
Module efficiency 19.90 % 21.28 % 1.38 pp more efficient
Temperature coefficient -0.390 %/°C -0.300 %/°C 0.090 %/°C better in heat
Rated power 420 Wp 660 Wp 240 W more power
Power density 198.9 Wp/m² 212.7 Wp/m² 13.8 Wp/m² higher
Weight 21.7 kg 38.0 kg 16.3 kg lighter
Product warranty 30 yrs 12 yrs 18 yrs longer
Weight per kWp 51.7 kg/kWp 57.6 kg/kWp 5.9 kg/kWp lighter
Short-circuit current 11.60 A 17.84 A 6.24 A apart
Module area 2.112 m² 3.103 m² 0.991 m² apart
Current at max power 11.09 A 17.01 A 5.92 A apart
Bifacial No Yes No vs Yes
Dimensions 1957x1079x35 mm 2383x1302x30 mm 1957x1079x35 mm vs 2383x1302x30 mm
02

What it means on a roof

Thirty years of production
Declared first-year losses, with 0.40% a year afterwards assumed for both panels, at 1,200 kWh/kWp a year
PowerXT 420R-PL
13,941 kWh
SPV660-TG12-132BD
21,907 kWh
Lifetime gap
7,966 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario PowerXT 420R-PL SPV660-TG12-132BD
Standard test conditions 25 °C 100.0% of rated power 420 W 660 W
Cool, bright day 40 °C 94.2% of rated power 395 W 630 W
Typical summer roof 55 °C 88.3% of rated power 371 W 601 W
Hot roof 70 °C 82.5% of rated power 346 W 571 W
03

Full specification

Parameter PowerXT 420R-PL SPV660-TG12-132BD Difference
Power and efficiency
Rated power 420 Wp 660 Wp +240 W for SPV660-TG12-132BD
Module efficiency 19.90 % 21.28 % +1.38 pp for SPV660-TG12-132BD
Power density 198.9 Wp/m² 212.7 Wp/m² +13.8 Wp/m² for SPV660-TG12-132BD
Open-circuit voltage 45.70 V 46.10 V Effectively the same
Voltage at max power 37.90 V 38.81 V Effectively the same
Short-circuit current 11.60 A 17.84 A 6.24 A apart
Current at max power 11.09 A 17.01 A 5.92 A apart
Temperature
Temperature coefficient -0.390 %/°C -0.300 %/°C +0.090 %/°C for SPV660-TG12-132BD
Mechanical
Dimensions 1957x1079x35 mm 2383x1302x30 mm 1957x1079x35 mm vs 2383x1302x30 mm
Module area 2.112 m² 3.103 m² 0.991 m² apart
Weight 21.7 kg 38.0 kg -16.3 kg for PowerXT 420R-PL
Weight per kWp 51.7 kg/kWp 57.6 kg/kWp -5.9 kg/kWp for PowerXT 420R-PL
Warranty and degradation
Product warranty 30 yrs 12 yrs +18 yrs for PowerXT 420R-PL
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.48 %/yr - Not published by Solaria
Technology
Cell technology - TOPCon Not published by Solaria
Cell type Monocrystalline Monocrystalline Same
Cell count - 132 Not published by Solaria
Bifacial No Yes No vs Yes
04

Against the whole database

14,005 panels
Efficiency
#12,331 vs #8,795
SPV660-TG12-132BD leads by 3,536 places
Power density
#12,344 vs #8,718
SPV660-TG12-132BD leads by 3,626 places
Heat behaviour
#13,579 vs #6,093
SPV660-TG12-132BD leads by 7,486 places
Weight
#5,023 vs #11,284
PowerXT 420R-PL leads by 6,261 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#9,324 vs #3,149
SPV660-TG12-132BD leads by 6,175 places
05

More useful comparisons

Open the full database
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Solaria PowerXT 420R-PL vs Solaria PowerXT 430R-PL
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Solaria PowerXT 420R-PL vs Solaria Solaria PowerXT-430C-PD
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Solaria PowerXT 420R-PL vs Solaria Solaria PowerXT-420C-BD
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Solaria PowerXT 420R-PL vs Solaria Solaria PowerXT-420C-PD
9 differences, the largest is performance warranty
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Solaria PowerXT 420R-PL vs Solaria Solaria PowerXT-410C-BD
10 differences, the largest is module efficiency
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Solaria
Solaria PowerXT 420R-PL vs Solaria Solaria PowerX-400R
13 differences, the largest is performance warranty
06

Written summary

07

Questions about this pairing

Which panel is better: Solaria PowerXT 420R-PL or Solaria SPV660-TG12-132BD?
According to our database: Solaria SPV660-TG12-132BD has higher module efficiency (21.28% vs 19.90%); Solaria SPV660-TG12-132BD tolerates heat better (temp coeff -0.300%/°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 PowerXT 420R-PL and Solaria SPV660-TG12-132BD?
Solaria PowerXT 420R-PL has a module efficiency of 19.90%, while Solaria SPV660-TG12-132BD is 21.28%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Solaria PowerXT 420R-PL use vs Solaria SPV660-TG12-132BD?
Solaria PowerXT 420R-PL uses Monocrystalline cells; Solaria SPV660-TG12-132BD uses TOPCon. 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 PowerXT 420R-PL and Solaria SPV660-TG12-132BD?
Solaria PowerXT 420R-PL has a 30 years power warranty; Solaria SPV660-TG12-132BD 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.
Are Solaria PowerXT 420R-PL and Solaria SPV660-TG12-132BD bifacial panels?
Solaria SPV660-TG12-132BD is bifacial (captures light from both faces); Solaria PowerXT 420R-PL is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath.

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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.