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

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

Solaria
SPV660-TG12-132BD
660 Wp 21.28 % TOPCon Bifacial Incomplete
Open panel page Datasheet PDF
VS
Solaria
PowerXT 420R-PL
420 Wp 19.90 %
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 SPV660-TG12-132BD PowerXT 420R-PL Difference
Module efficiency 21.28 % 19.90 % 1.38 pp more efficient
Temperature coefficient -0.300 %/°C -0.390 %/°C 0.090 %/°C better in heat
Rated power 660 Wp 420 Wp 240 W more power
Power density 212.7 Wp/m² 198.9 Wp/m² 13.8 Wp/m² higher
Weight 38.0 kg 21.7 kg 16.3 kg lighter
Product warranty 12 yrs 30 yrs 18 yrs longer
Weight per kWp 57.6 kg/kWp 51.7 kg/kWp 5.9 kg/kWp lighter
Short-circuit current 17.84 A 11.60 A 6.24 A apart
Module area 3.103 m² 2.112 m² 0.991 m² apart
Current at max power 17.01 A 11.09 A 5.92 A apart
Bifacial Yes No Yes vs No
Dimensions 2383x1302x30 mm 1957x1079x35 mm 2383x1302x30 mm vs 1957x1079x35 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
SPV660-TG12-132BD
21,907 kWh
PowerXT 420R-PL
13,941 kWh
Lifetime gap
7,966 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario SPV660-TG12-132BD PowerXT 420R-PL
Standard test conditions 25 °C 100.0% of rated power 660 W 420 W
Cool, bright day 40 °C 94.2% of rated power 630 W 395 W
Typical summer roof 55 °C 88.3% of rated power 601 W 371 W
Hot roof 70 °C 82.5% of rated power 571 W 346 W
03

Full specification

Parameter SPV660-TG12-132BD PowerXT 420R-PL Difference
Power and efficiency
Rated power 660 Wp 420 Wp +240 W for SPV660-TG12-132BD
Module efficiency 21.28 % 19.90 % +1.38 pp for SPV660-TG12-132BD
Power density 212.7 Wp/m² 198.9 Wp/m² +13.8 Wp/m² for SPV660-TG12-132BD
Open-circuit voltage 46.10 V 45.70 V Effectively the same
Voltage at max power 38.81 V 37.90 V Effectively the same
Short-circuit current 17.84 A 11.60 A 6.24 A apart
Current at max power 17.01 A 11.09 A 5.92 A apart
Temperature
Temperature coefficient -0.300 %/°C -0.390 %/°C +0.090 %/°C for SPV660-TG12-132BD
Mechanical
Dimensions 2383x1302x30 mm 1957x1079x35 mm 2383x1302x30 mm vs 1957x1079x35 mm
Module area 3.103 m² 2.112 m² 0.991 m² apart
Weight 38.0 kg 21.7 kg -16.3 kg for PowerXT 420R-PL
Weight per kWp 57.6 kg/kWp 51.7 kg/kWp -5.9 kg/kWp for PowerXT 420R-PL
Warranty and degradation
Product warranty 12 yrs 30 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 Yes No Yes vs No
04

Against the whole database

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

More useful comparisons

Open the full database
Same series, other bin
Solaria
Solaria SPV660-TG12-132BD vs Solaria SPV680-TG12-132BD
3 differences, the largest is module efficiency
Same series, other bin
Solaria
Solaria SPV660-TG12-132BD vs Solaria SPV675-TG12-132BD
3 differences, the largest is module efficiency
Same series, other bin
Solaria
Solaria SPV660-TG12-132BD vs Solaria SPV670-TG12-132BD
3 differences, the largest is module efficiency
Same series, other bin
Solaria
Solaria SPV660-TG12-132BD vs Solaria SPV665-TG12-132BD
The same specification on paper
Same series, other bin
Solaria
Solaria PowerXT 420R-PL vs Solaria PowerXT 430R-PL
3 differences, the largest is module efficiency
Same series, other bin
Solaria
Solaria PowerXT 420R-PL vs Solaria Solaria PowerXT-430C-PD
9 differences, the largest is performance warranty
06

Written summary

07

Questions about this pairing

Which panel is better: Solaria SPV660-TG12-132BD or Solaria PowerXT 420R-PL?
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 SPV660-TG12-132BD and Solaria PowerXT 420R-PL?
Solaria SPV660-TG12-132BD has a module efficiency of 21.28%, 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 SPV660-TG12-132BD use vs Solaria PowerXT 420R-PL?
Solaria SPV660-TG12-132BD uses TOPCon 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 SPV660-TG12-132BD and Solaria PowerXT 420R-PL?
Solaria SPV660-TG12-132BD has a 30 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.
Are Solaria SPV660-TG12-132BD and Solaria PowerXT 420R-PL 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.

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.