GCL GCL-M10/72GDF-B-555 vs GCL GCL-M10/72GDF-B-550
VS
The verdict
Identical on every published parameter
All 19 comparable parameters agree. Two records this alike are usually one panel sold under two names, or two bins of the same production line - decide on price and on who you would rather buy from.
How alike are they
19
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
0 of 19 parameters
What actually differs
Every comparable parameter agrees. The full specification is below.
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 (-0.350 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
555
18,277 kWh
550
18,112 kWh
Lifetime gap
165 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
555
550
Standard test conditions
25 °C
100.0% of rated power
555 W
550 W
Cool, bright day
40 °C
94.8% of rated power
526 W
521 W
Typical summer roof
55 °C
89.5% of rated power
497 W
492 W
Hot roof
70 °C
84.2% of rated power
468 W
463 W
03
Full specification
Parameter
555
550
Difference
Power and efficiency
Rated power
555 Wp
550 Wp
Effectively the same
Module efficiency
21.10 %
21.00 %
Effectively the same
Power density
211.5 Wp/m²
209.6 Wp/m²
Effectively the same
Open-circuit voltage
50.08 V
49.80 V
Effectively the same
Voltage at max power
42.18 V
41.93 V
Effectively the same
Short-circuit current
13.93 A
13.88 A
Effectively the same
Current at max power
13.16 A
13.12 A
Effectively the same
Temperature
Temperature coefficient
-0.350 %/°C
-0.350 %/°C
Same
Mechanical
Dimensions
2290x1146x30 mm
2290x1146x30 mm
Same
Module area
2.624 m²
2.624 m²
Same
Weight
33.2 kg
33.2 kg
Same
Weight per kWp
59.8 kg/kWp
60.4 kg/kWp
Effectively the same
Warranty and degradation
Product warranty
12 yrs
12 yrs
Same
Performance warranty
30 yrs
30 yrs
Same
Annual degradation
0.45 %/yr
0.45 %/yr
Same
Technology
Cell technology
PERC
PERC
Same
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
144
144
Same
Bifacial
Yes
Yes
Same
04
14,005 panels
Against the whole database
Efficiency
#9,297
vs
#9,758
555 leads by 461 places
Power density
#9,200
vs
#9,926
555 leads by 726 places
Heat behaviour
#10,419
vs
#10,419
Tied - the same position in the database
Weight
#12,297
vs
#12,444
555 leads by 147 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#7,100
vs
#7,387
555 leads by 287 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: GCL GCL-M10/72GDF-B-555 or GCL GCL-M10/72GDF-B-550?
According to our database: GCL GCL-M10/72GDF-B-555 has higher module efficiency (21.10% vs 21.00%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of GCL GCL-M10/72GDF-B-555 and GCL GCL-M10/72GDF-B-550?
GCL GCL-M10/72GDF-B-555 has a module efficiency of 21.10%, while GCL GCL-M10/72GDF-B-550 is 21.00%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does GCL GCL-M10/72GDF-B-555 use vs GCL GCL-M10/72GDF-B-550?
GCL GCL-M10/72GDF-B-555 uses PERC cells; GCL GCL-M10/72GDF-B-550 uses PERC. 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 GCL GCL-M10/72GDF-B-555 and GCL GCL-M10/72GDF-B-550?
GCL GCL-M10/72GDF-B-555 has a 30 years power warranty; GCL GCL-M10/72GDF-B-550 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 GCL GCL-M10/72GDF-B-555 and GCL GCL-M10/72GDF-B-550 bifacial panels?
Both GCL GCL-M10/72GDF-B-555 and GCL GCL-M10/72GDF-B-550 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.
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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.