Just Solar JST-FCMH-710W-HD vs Just Solar JST-FCMH-740W-HD
VS
The verdict
740W-HD leads on the differences that matter
The largest is module efficiency: 0.96 pp more efficient. 13 of 19 comparable parameters are identical.
See all 6 differencesHow alike are they
13
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
6 of 19 parameters
What actually differs
Parameter
710W-HD
740W-HD
Difference
Module efficiency
22.86 %
23.82 %
0.96 pp more efficient
Power density
228.6 Wp/m²
238.2 Wp/m²
9.7 Wp/m² higher
Rated power
710 Wp
740 Wp
30 W more power
Weight per kWp
53.9 kg/kWp
51.8 kg/kWp
2.2 kg/kWp lighter
Open-circuit voltage
50.71 V
52.11 V
1.40 V apart
Voltage at max power
43.46 V
44.79 V
1.33 V apart
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
Same temp coeff. for both panels (-0.260 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
710W-HD
24,193 kWh
740W-HD
25,215 kWh
Lifetime gap
1,022 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
710W-HD
740W-HD
Standard test conditions
25 °C
100.0% of rated power
710 W
740 W
Cool, bright day
40 °C
96.1% of rated power
682 W
711 W
Typical summer roof
55 °C
92.2% of rated power
655 W
682 W
Hot roof
70 °C
88.3% of rated power
627 W
653 W
03
Full specification
Parameter
710W-HD
740W-HD
Difference
Power and efficiency
Rated power
710 Wp
740 Wp
+30 W for 740W-HD
Module efficiency
22.86 %
23.82 %
+0.96 pp for 740W-HD
Power density
228.6 Wp/m²
238.2 Wp/m²
+9.7 Wp/m² for 740W-HD
Open-circuit voltage
50.71 V
52.11 V
1.40 V apart
Voltage at max power
43.46 V
44.79 V
1.33 V apart
Short-circuit current
17.25 A
17.37 A
Effectively the same
Current at max power
16.34 A
16.52 A
Effectively the same
Temperature
Temperature coefficient
-0.260 %/°C
-0.260 %/°C
Same
Mechanical
Dimensions
2384x1303x33 mm
2384x1303x33 mm
Same
Module area
3.106 m²
3.106 m²
Same
Weight
38.3 kg
38.3 kg
Same
Weight per kWp
53.9 kg/kWp
51.8 kg/kWp
-2.2 kg/kWp for 740W-HD
Warranty and degradation
Product warranty
15 yrs
15 yrs
Same
Performance warranty
30 yrs
30 yrs
Same
Annual degradation
0.30 %/yr
0.30 %/yr
Same
Technology
Cell technology
HJT
HJT
Same
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
132
132
Same
Bifacial
Yes
Yes
Same
04
14,005 panels
Against the whole database
Efficiency
#2,536
vs
#418
740W-HD leads by 2,118 places
Power density
#2,474
vs
#431
740W-HD leads by 2,043 places
Heat behaviour
#511
vs
#511
Tied - the same position in the database
Weight
#8,122
vs
#5,125
740W-HD leads by 2,997 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#608
vs
#127
740W-HD leads by 481 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: Just Solar JST-FCMH-710W-HD or Just Solar JST-FCMH-740W-HD?
According to our database: Just Solar JST-FCMH-740 W-HD has higher module efficiency (23.82% vs 22.86%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Just Solar JST-FCMH-710W-HD and Just Solar JST-FCMH-740W-HD?
Just Solar JST-FCMH-710 W-HD has a module efficiency of 22.86%, while Just Solar JST-FCMH-740 W-HD is 23.82%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Just Solar JST-FCMH-710W-HD use vs Just Solar JST-FCMH-740W-HD?
Just Solar JST-FCMH-710 W-HD uses HJT cells; Just Solar JST-FCMH-740 W-HD uses HJT. 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 Just Solar JST-FCMH-710W-HD and Just Solar JST-FCMH-740W-HD?
Just Solar JST-FCMH-710 W-HD has a 30 years power warranty; Just Solar JST-FCMH-740 W-HD 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 Just Solar JST-FCMH-710W-HD and Just Solar JST-FCMH-740W-HD bifacial panels?
Both Just Solar JST-FCMH-710 W-HD and Just Solar JST-FCMH-740 W-HD 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 1 Just Solar 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.