Longi Solar LR7-72HVH-635M vs Longi Solar LR7-72HVH-670M
VS
The verdict
670M leads on the differences that matter
The largest is module efficiency: 1.30 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
635M
670M
Difference
Module efficiency
23.50 %
24.80 %
1.30 pp more efficient
Power density
235.1 Wp/m²
248.0 Wp/m²
13.0 Wp/m² higher
Rated power
635 Wp
670 Wp
35 W more power
Weight per kWp
44.9 kg/kWp
42.5 kg/kWp
2.3 kg/kWp lighter
Short-circuit current
15.05 A
15.60 A
0.55 A apart
Current at max power
14.35 A
14.91 A
0.56 A 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.
635M
21,471 kWh
670M
22,655 kWh
Lifetime gap
1,184 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
635M
670M
Standard test conditions
25 °C
100.0% of rated power
635 W
670 W
Cool, bright day
40 °C
96.1% of rated power
610 W
644 W
Typical summer roof
55 °C
92.2% of rated power
585 W
618 W
Hot roof
70 °C
88.3% of rated power
561 W
592 W
03
Full specification
Parameter
635M
670M
Difference
Power and efficiency
Rated power
635 Wp
670 Wp
+35 W for 670M
Module efficiency
23.50 %
24.80 %
+1.30 pp for 670M
Power density
235.1 Wp/m²
248.0 Wp/m²
+13.0 Wp/m² for 670M
Open-circuit voltage
53.60 V
54.30 V
Effectively the same
Voltage at max power
44.26 V
44.96 V
Effectively the same
Short-circuit current
15.05 A
15.60 A
0.55 A apart
Current at max power
14.35 A
14.91 A
0.56 A apart
Temperature
Temperature coefficient
-0.260 %/°C
-0.260 %/°C
Same
Mechanical
Dimensions
2382x1134x30 mm
2382x1134x30 mm
Same
Module area
2.701 m²
2.701 m²
Same
Weight
28.5 kg
28.5 kg
Same
Weight per kWp
44.9 kg/kWp
42.5 kg/kWp
-2.3 kg/kWp for 670M
Warranty and degradation
Product warranty
15 yrs
15 yrs
Same
Performance warranty
30 yrs
30 yrs
Same
Annual degradation
0.35 %/yr
0.35 %/yr
Same
Technology
Cell technology
N-type
N-type
Same
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
144
144
Same
Bifacial
No
No
Same
04
14,129 panels
Against the whole database
Efficiency
#749
vs
#13
670M leads by 736 places
Power density
#777
vs
#15
670M leads by 762 places
Heat behaviour
#515
vs
#515
Tied - the same position in the database
Weight
#560
vs
#226
670M leads by 334 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#1,413
vs
#285
670M leads by 1,128 places
05
Open the full database
More useful comparisons
Same series, other bin
Longi Solar LR7-72HVH-635M vs Longi Solar LR7-72HVH-630M
One difference: module efficiency
Same series, other bin
Longi Solar LR7-72HVH-670M vs Longi Solar LR7-72HVH-665M
One difference: module efficiency
Same series, other bin
Longi Solar LR7-72HVH-670M vs Longi Solar LR7-72HVH-660M
3 differences, the largest is module efficiency
Same series, other bin
Longi Solar LR7-72HVH-670M vs Longi Solar LR7-72HVH-655M
3 differences, the largest is module efficiency
Same series, other bin
Longi Solar LR7-72HVH-670M vs Longi Solar LR7-72HVH-650M
3 differences, the largest is module efficiency
Same series, other bin
Longi Solar LR7-72HVH-670M vs Longi Solar LR7-72HVH-645M
3 differences, the largest is module efficiency
06
Written summary
Checking cache...
07
Questions about this pairing
Which panel is better: Longi Solar LR7-72HVH-635M or Longi Solar LR7-72HVH-670M?
According to our database: Longi Solar LR7-72HVH-670M has higher module efficiency (24.80% vs 23.50%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Longi Solar LR7-72HVH-635M and Longi Solar LR7-72HVH-670M?
Longi Solar LR7-72HVH-635M has a module efficiency of 23.50%, while Longi Solar LR7-72HVH-670M is 24.80%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Longi Solar LR7-72HVH-635M use vs Longi Solar LR7-72HVH-670M?
Longi Solar LR7-72HVH-635M uses N-type cells; Longi Solar LR7-72HVH-670M uses N-type. 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 LR7-72HVH-635M and Longi Solar LR7-72HVH-670M?
Longi Solar LR7-72HVH-635M has a 30 years power warranty; Longi Solar LR7-72HVH-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.
Shop prices: See 151 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.