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HS640TC-MHD-D vs HS635TC-MHD-D 18 of 19 identical Swap Change panels

Horay Solar HS640TC-MHD-D vs Horay Solar HS635TC-MHD-D

HS640TC-MHD-D
640 Wp 22.90 % N-type Bifacial
Open panel page Datasheet PDF
VS
HS635TC-MHD-D
635 Wp 22.70 % N-type Bifacial
Open panel page Datasheet PDF
The verdict

HS640TC-MHD-D leads on the differences that matter

The largest is module efficiency: 0.20 pp more efficient. 18 of 19 comparable parameters are identical.

See the one difference
How alike are they
18 of 19 comparable
parameters are identical
identical differs
01

What actually differs

1 of 19 parameters
Parameter HS640TC-MHD-D HS635TC-MHD-D Difference
Module efficiency 22.90 % 22.70 % 0.20 pp more efficient
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 (-0.280 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
HS640TC-MHD-D
21,473 kWh
HS635TC-MHD-D
21,306 kWh
Lifetime gap
167 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario HS640TC-MHD-D HS635TC-MHD-D
Standard test conditions 25 °C 100.0% of rated power 640 W 635 W
Cool, bright day 40 °C 95.8% of rated power 613 W 608 W
Typical summer roof 55 °C 91.6% of rated power 586 W 582 W
Hot roof 70 °C 87.4% of rated power 559 W 555 W
03

Full specification

Parameter HS640TC-MHD-D HS635TC-MHD-D Difference
Power and efficiency
Rated power 640 Wp 635 Wp Effectively the same
Module efficiency 22.90 % 22.70 % +0.20 pp for HS640TC-MHD-D
Power density 229.0 Wp/m² 227.2 Wp/m² Effectively the same
Open-circuit voltage 48.08 V 48.05 V Effectively the same
Voltage at max power 40.79 V 40.76 V Effectively the same
Short-circuit current 16.71 A 16.59 A Effectively the same
Current at max power 15.69 A 15.58 A Effectively the same
Temperature
Temperature coefficient -0.280 %/°C -0.280 %/°C Same
Mechanical
Dimensions 2465x1134x30 mm 2465x1134x30 mm Same
Module area 2.795 m² 2.795 m² Same
Weight 34.5 kg 34.5 kg Same
Weight per kWp 53.9 kg/kWp 54.3 kg/kWp Effectively the same
Warranty and degradation
Product warranty 15 yrs 15 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.40 %/yr 0.40 %/yr Same
Technology
Cell technology N-type N-type Same
Cell type Monocrystalline Monocrystalline Same
Cell count 144 144 Same
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#2,359 vs #3,307
HS640TC-MHD-D leads by 948 places
Power density
#2,389 vs #3,252
HS640TC-MHD-D leads by 863 places
Heat behaviour
#1,309 vs #1,309
Tied - the same position in the database
Weight
#8,037 vs #8,621
HS640TC-MHD-D leads by 584 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#1,704 vs #1,931
HS640TC-MHD-D leads by 227 places
05

More useful comparisons

Open the full database
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Horay Solar HS640TC-MHD-D vs Horay Solar HS630TC-MHD-D
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Horay Solar HS640TC-MHD-D vs Horay Solar HS720TC-MHG-D
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Horay Solar HS640TC-MHD-D vs Horay Solar HS710TC-MHG-D
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Horay Solar HS640TC-MHD-D vs Horay Solar HS700TC-MHG-D
10 differences, the largest is rated power
06

Written summary

07

Questions about this pairing

Which panel is better: Horay Solar HS640TC-MHD-D or Horay Solar HS635TC-MHD-D?
According to our database: Horay Solar HS640TC-MHD-D has higher module efficiency (22.90% vs 22.70%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Horay Solar HS640TC-MHD-D and Horay Solar HS635TC-MHD-D?
Horay Solar HS640TC-MHD-D has a module efficiency of 22.90%, while Horay Solar HS635TC-MHD-D is 22.70%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Horay Solar HS640TC-MHD-D use vs Horay Solar HS635TC-MHD-D?
Horay Solar HS640TC-MHD-D uses N-type cells; Horay Solar HS635TC-MHD-D 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 Horay Solar HS640TC-MHD-D and Horay Solar HS635TC-MHD-D?
Horay Solar HS640TC-MHD-D has a 30 years power warranty; Horay Solar HS635TC-MHD-D 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 Horay Solar HS640TC-MHD-D and Horay Solar HS635TC-MHD-D bifacial panels?
Both Horay Solar HS640TC-MHD-D and Horay Solar HS635TC-MHD-D 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.

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.