Jetion JT795SXt(B) vs Longi Solar LR8-66HYD-670M
VS
The verdict
LR8-66HYD-670M leads on the differences that matter
The largest is module efficiency: 1.30 pp more efficient. 5 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.
See all 13 differencesHow alike are they
5
of 18 comparable
parameters are identical
parameters are identical
identical
differs
not published
01
13 of 18 parameters
What actually differs
Parameter
JT795SXt(B)
LR8-66HYD-670M
Difference
Module efficiency
23.50 %
24.80 %
1.30 pp more efficient
Rated power
795 Wp
670 Wp
125 W more power
Power density
235.1 Wp/m²
248.0 Wp/m²
12.9 Wp/m² higher
Temperature coefficient
-0.290 %/°C
-0.260 %/°C
0.030 %/°C better in heat
Weight
40.0 kg
33.5 kg
6.5 kg lighter
Open-circuit voltage
54.17 V
50.12 V
4.05 V apart
Module area
3.381 m²
2.701 m²
0.680 m² apart
Short-circuit current
18.67 A
16.86 A
1.81 A apart
Cell technology
TOPCon
Back Contact
TOPCon vs Back Contact
Voltage at max power
45.53 V
41.38 V
4.15 V apart
Cell count
144
132
12 cells apart
Current at max power
17.47 A
16.19 A
1.28 A apart
Dimensions
2595x1303x33 mm
2382x1134x30 mm
2595x1303x33 mm vs 2382x1134x30 mm
02
What it means on a roof
Thirty years of production
A 1.0% first-year loss then 0.40% a year, assumed for both panels, at 1,200 kWh/kWp a year
JT795SXt(B)
26,674 kWh
LR8-66HYD-670M
22,480 kWh
Lifetime gap
4,194 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
JT795SXt(B)
LR8-66HYD-670M
Standard test conditions
25 °C
100.0% of rated power
795 W
670 W
Cool, bright day
40 °C
95.7% of rated power
760 W
644 W
Typical summer roof
55 °C
91.3% of rated power
726 W
618 W
Hot roof
70 °C
87.0% of rated power
691 W
592 W
03
Full specification
Parameter
JT795SXt(B)
LR8-66HYD-670M
Difference
Power and efficiency
Rated power
795 Wp
670 Wp
+125 W for JT795SXt(B)
Module efficiency
23.50 %
24.80 %
+1.30 pp for LR8-66HYD-670M
Power density
235.1 Wp/m²
248.0 Wp/m²
+12.9 Wp/m² for LR8-66HYD-670M
Open-circuit voltage
54.17 V
50.12 V
4.05 V apart
Voltage at max power
45.53 V
41.38 V
4.15 V apart
Short-circuit current
18.67 A
16.86 A
1.81 A apart
Current at max power
17.47 A
16.19 A
1.28 A apart
Temperature
Temperature coefficient
-0.290 %/°C
-0.260 %/°C
+0.030 %/°C for LR8-66HYD-670M
Mechanical
Dimensions
2595x1303x33 mm
2382x1134x30 mm
2595x1303x33 mm vs 2382x1134x30 mm
Module area
3.381 m²
2.701 m²
0.680 m² apart
Weight
40.0 kg
33.5 kg
-6.5 kg for LR8-66HYD-670M
Weight per kWp
50.3 kg/kWp
50.0 kg/kWp
Effectively the same
Warranty and degradation
Product warranty
12 yrs
12 yrs
Same
Performance warranty
30 yrs
30 yrs
Same
Annual degradation
0.40 %/yr
-
Not published by Longi Solar
Technology
Cell technology
TOPCon
Back Contact
TOPCon vs Back Contact
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
144
132
12 cells apart
Bifacial
Yes
Yes
Same
04
14,005 panels
Against the whole database
Efficiency
#716
vs
#12
LR8-66HYD-670M leads by 704 places
Power density
#740
vs
#14
LR8-66HYD-670M leads by 726 places
Heat behaviour
#2,165
vs
#511
LR8-66HYD-670M leads by 1,654 places
Weight
#3,713
vs
#3,317
LR8-66HYD-670M leads by 396 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#54
vs
#490
JT795SXt(B) leads by 436 places
05
Open the full database
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Longi Solar LR8-66HYD-670M vs Longi Solar LR8-66HYD-665M
One difference: module efficiency
06
Written summary
Checking cache...
07
Questions about this pairing
Which panel is better: Jetion JT795SXt(B) or Longi Solar LR8-66HYD-670M?
According to our database: Longi Solar LR8-66HYD-670M has higher module efficiency (24.80% vs 23.50%); Longi Solar LR8-66HYD-670M tolerates heat better (temp coeff -0.260%/°C vs -0.290%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Jetion JT795SXt(B) and Longi Solar LR8-66HYD-670M?
Jetion JT795SXt(B) has a module efficiency of 23.50%, while Longi Solar LR8-66HYD-670M is 24.80%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Jetion JT795SXt(B) use vs Longi Solar LR8-66HYD-670M?
Jetion JT795SXt(B) uses TOPCon cells; Longi Solar LR8-66HYD-670M 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 Jetion JT795SXt(B) and Longi Solar LR8-66HYD-670M?
Jetion JT795SXt(B) has a 30 years power warranty; Longi Solar LR8-66HYD-670M 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 Jetion JT795SXt(B) and Longi Solar LR8-66HYD-670M bifacial panels?
Both Jetion JT795SXt(B) and Longi Solar LR8-66HYD-670M are bifacial - they capture reflected light from the ground, which can add 5-15% more annual energy on ground-mount or elevated rooftop installations with a light surface beneath.
Shop prices: See 2 Jetion offers · See 174 Longi Solar 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.