Longi Solar LR8-66HYD-670M vs Jetion JT795SXt(B)
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
LR8-66HYD-670M
JT795SXt(B)
Difference
Module efficiency
24.80 %
23.50 %
1.30 pp more efficient
Rated power
670 Wp
795 Wp
125 W more power
Power density
248.0 Wp/m²
235.1 Wp/m²
12.9 Wp/m² higher
Temperature coefficient
-0.260 %/°C
-0.290 %/°C
0.030 %/°C better in heat
Weight
33.5 kg
40.0 kg
6.5 kg lighter
Open-circuit voltage
50.12 V
54.17 V
4.05 V apart
Module area
2.701 m²
3.381 m²
0.680 m² apart
Short-circuit current
16.86 A
18.67 A
1.81 A apart
Cell technology
Back Contact
TOPCon
Back Contact vs TOPCon
Voltage at max power
41.38 V
45.53 V
4.15 V apart
Cell count
132
144
12 cells apart
Current at max power
16.19 A
17.47 A
1.28 A apart
Dimensions
2382x1134x30 mm
2595x1303x33 mm
2382x1134x30 mm vs 2595x1303x33 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
LR8-66HYD-670M
22,480 kWh
JT795SXt(B)
26,674 kWh
Lifetime gap
4,194 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
LR8-66HYD-670M
JT795SXt(B)
Standard test conditions
25 °C
100.0% of rated power
670 W
795 W
Cool, bright day
40 °C
95.7% of rated power
644 W
760 W
Typical summer roof
55 °C
91.3% of rated power
618 W
726 W
Hot roof
70 °C
87.0% of rated power
592 W
691 W
03
Full specification
Parameter
LR8-66HYD-670M
JT795SXt(B)
Difference
Power and efficiency
Rated power
670 Wp
795 Wp
+125 W for JT795SXt(B)
Module efficiency
24.80 %
23.50 %
+1.30 pp for LR8-66HYD-670M
Power density
248.0 Wp/m²
235.1 Wp/m²
+12.9 Wp/m² for LR8-66HYD-670M
Open-circuit voltage
50.12 V
54.17 V
4.05 V apart
Voltage at max power
41.38 V
45.53 V
4.15 V apart
Short-circuit current
16.86 A
18.67 A
1.81 A apart
Current at max power
16.19 A
17.47 A
1.28 A apart
Temperature
Temperature coefficient
-0.260 %/°C
-0.290 %/°C
+0.030 %/°C for LR8-66HYD-670M
Mechanical
Dimensions
2382x1134x30 mm
2595x1303x33 mm
2382x1134x30 mm vs 2595x1303x33 mm
Module area
2.701 m²
3.381 m²
0.680 m² apart
Weight
33.5 kg
40.0 kg
-6.5 kg for LR8-66HYD-670M
Weight per kWp
50.0 kg/kWp
50.3 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
Back Contact
TOPCon
Back Contact vs TOPCon
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
132
144
12 cells apart
Bifacial
Yes
Yes
Same
04
14,005 panels
Against the whole database
Efficiency
#12
vs
#716
LR8-66HYD-670M leads by 704 places
Power density
#14
vs
#740
LR8-66HYD-670M leads by 726 places
Heat behaviour
#511
vs
#2,165
LR8-66HYD-670M leads by 1,654 places
Weight
#3,317
vs
#3,713
LR8-66HYD-670M leads by 396 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#490
vs
#54
JT795SXt(B) leads by 436 places
05
Open the full database
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3 differences, the largest is module efficiency
06
Written summary
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07
Questions about this pairing
Which panel is better: Longi Solar LR8-66HYD-670M or Jetion JT795SXt(B)?
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 Longi Solar LR8-66HYD-670M and Jetion JT795SXt(B)?
Longi Solar LR8-66HYD-670M has a module efficiency of 24.80%, while Jetion JT795SXt(B) is 23.50%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Longi Solar LR8-66HYD-670M use vs Jetion JT795SXt(B)?
Longi Solar LR8-66HYD-670M uses Back Contact cells; Jetion JT795SXt(B) 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 Longi Solar LR8-66HYD-670M and Jetion JT795SXt(B)?
Longi Solar LR8-66HYD-670M has a 30 years power warranty; Jetion JT795SXt(B) 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 Longi Solar LR8-66HYD-670M and Jetion JT795SXt(B) bifacial panels?
Both Longi Solar LR8-66HYD-670M and Jetion JT795SXt(B) 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 174 Longi Solar offers · See 2 Jetion 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.