Tongwei TWMNH-48HC vs Tongwei TWMNH-66HS
VS
The verdict
66HS leads on the differences that matter
The largest is module efficiency: 6.48 pp more efficient. 12 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.
See all 6 differencesHow alike are they
12
of 18 comparable
parameters are identical
parameters are identical
identical
differs
not published
01
6 of 18 parameters
What actually differs
Parameter
48HC
66HS
Difference
Module efficiency
16.66 %
23.14 %
6.48 pp more efficient
Rated power
450 Wp
625 Wp
175 W more power
Power density
166.6 Wp/m²
231.4 Wp/m²
64.8 Wp/m² higher
Weight per kWp
64.4 kg/kWp
46.4 kg/kWp
18.0 kg/kWp lighter
Open-circuit voltage
35.03 V
49.25 V
14.22 V apart
Voltage at max power
30.08 V
40.77 V
10.69 V apart
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
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.
48HC
15,098 kWh
66HS
20,970 kWh
Lifetime gap
5,872 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
48HC
66HS
Standard test conditions
25 °C
100.0% of rated power
450 W
625 W
Cool, bright day
40 °C
95.8% of rated power
431 W
599 W
Typical summer roof
55 °C
91.6% of rated power
412 W
573 W
Hot roof
70 °C
87.4% of rated power
393 W
546 W
03
Full specification
Parameter
48HC
66HS
Difference
Power and efficiency
Rated power
450 Wp
625 Wp
+175 W for 66HS
Module efficiency
16.66 %
23.14 %
+6.48 pp for 66HS
Power density
166.6 Wp/m²
231.4 Wp/m²
+64.8 Wp/m² for 66HS
Open-circuit voltage
35.03 V
49.25 V
14.22 V apart
Voltage at max power
30.08 V
40.77 V
10.69 V apart
Short-circuit current
16.05 A
16.14 A
Effectively the same
Current at max power
14.97 A
15.33 A
Effectively the same
Temperature
Temperature coefficient
-0.280 %/°C
-0.280 %/°C
Same
Mechanical
Dimensions
2382x1134x30 mm
2382x1134x30 mm
Same
Module area
2.701 m²
2.701 m²
Same
Weight
29.0 kg
29.0 kg
Same
Weight per kWp
64.4 kg/kWp
46.4 kg/kWp
-18.0 kg/kWp for 66HS
Warranty and degradation
Product warranty
15 yrs
15 yrs
Same
Performance warranty
30 yrs
30 yrs
Same
Annual degradation
-
-
Neither datasheet publishes this
Technology
Cell technology
TOPCon
TOPCon
Same
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
132
132
Same
Bifacial
Yes
Yes
Same
04
14,005 panels
Against the whole database
Efficiency
#13,534
vs
#1,509
66HS leads by 12,025 places
Power density
#13,523
vs
#1,513
66HS leads by 12,010 places
Heat behaviour
#1,309
vs
#1,309
Tied - the same position in the database
Weight
#12,985
vs
#1,141
66HS leads by 11,844 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#12,508
vs
#1,789
66HS leads by 10,719 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: Tongwei TWMNH-48HC or Tongwei TWMNH-66HS?
According to our database: Tongwei TWMNH-66HS has higher module efficiency (23.14% vs 16.66%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Tongwei TWMNH-48HC and Tongwei TWMNH-66HS?
Tongwei TWMNH-48HC has a module efficiency of 16.66%, while Tongwei TWMNH-66HS is 23.14%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Tongwei TWMNH-48HC use vs Tongwei TWMNH-66HS?
Tongwei TWMNH-48HC uses TOPCon cells; Tongwei TWMNH-66HS 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 Tongwei TWMNH-48HC and Tongwei TWMNH-66HS?
Tongwei TWMNH-48HC has a 30 years power warranty; Tongwei TWMNH-66HS 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 Tongwei TWMNH-48HC and Tongwei TWMNH-66HS bifacial panels?
Both Tongwei TWMNH-48HC and Tongwei TWMNH-66HS 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.