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66HS vs 48HC 12 of 18 identical Swap Change panels

Tongwei TWMNH-66HS vs Tongwei TWMNH-48HC

TWMNH-66HS
625 Wp 23.14 % TOPCon Bifacial Incomplete
Open panel page Datasheet PDF
VS
TWMNH-48HC
450 Wp 16.66 % TOPCon Bifacial Incomplete
Open panel page Datasheet PDF
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 differences
How alike are they
12 of 18 comparable
parameters are identical
identical differs not published
01

What actually differs

6 of 18 parameters
Parameter 66HS 48HC Difference
Module efficiency 23.14 % 16.66 % 6.48 pp more efficient
Rated power 625 Wp 450 Wp 175 W more power
Power density 231.4 Wp/m² 166.6 Wp/m² 64.8 Wp/m² higher
Weight per kWp 46.4 kg/kWp 64.4 kg/kWp 18.0 kg/kWp lighter
Open-circuit voltage 49.25 V 35.03 V 14.22 V apart
Voltage at max power 40.77 V 30.08 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.
66HS
20,970 kWh
48HC
15,098 kWh
Lifetime gap
5,872 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 66HS 48HC
Standard test conditions 25 °C 100.0% of rated power 625 W 450 W
Cool, bright day 40 °C 95.8% of rated power 599 W 431 W
Typical summer roof 55 °C 91.6% of rated power 573 W 412 W
Hot roof 70 °C 87.4% of rated power 546 W 393 W
03

Full specification

Parameter 66HS 48HC Difference
Power and efficiency
Rated power 625 Wp 450 Wp +175 W for 66HS
Module efficiency 23.14 % 16.66 % +6.48 pp for 66HS
Power density 231.4 Wp/m² 166.6 Wp/m² +64.8 Wp/m² for 66HS
Open-circuit voltage 49.25 V 35.03 V 14.22 V apart
Voltage at max power 40.77 V 30.08 V 10.69 V apart
Short-circuit current 16.14 A 16.05 A Effectively the same
Current at max power 15.33 A 14.97 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 46.4 kg/kWp 64.4 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

Against the whole database

14,005 panels
Efficiency
#1,509 vs #13,534
66HS leads by 12,025 places
Power density
#1,513 vs #13,523
66HS leads by 12,010 places
Heat behaviour
#1,309 vs #1,309
Tied - the same position in the database
Weight
#1,141 vs #12,985
66HS leads by 11,844 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#1,789 vs #12,508
66HS leads by 10,719 places
05

More useful comparisons

Open the full database
Same series, other bin
Tongwei TWMNH-66HS vs Tongwei THC G12-66 Bifacial
11 differences, the largest is module efficiency
Same series, other bin
Tongwei TWMNH-66HS vs Tongwei TWMNF-66HD
7 differences, the largest is rated power
Same series, other bin
Tongwei TWMNH-66HS vs Tongwei TWMNH-66HD
The same specification on paper
Same series, other bin
Tongwei TWMNH-66HS vs Tongwei TWMNH-54HD
6 differences, the largest is module efficiency
Same manufacturer
Tongwei TWMNH-66HS vs Tongwei TWMNF-66HD750
11 differences, the largest is module efficiency
Same manufacturer
Tongwei TWMNH-66HS vs Tongwei TWMNF-66HD745
11 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: Tongwei TWMNH-66HS or Tongwei TWMNH-48HC?
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-66HS and Tongwei TWMNH-48HC?
Tongwei TWMNH-66HS has a module efficiency of 23.14%, while Tongwei TWMNH-48HC is 16.66%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Tongwei TWMNH-66HS use vs Tongwei TWMNH-48HC?
Tongwei TWMNH-66HS uses TOPCon cells; Tongwei TWMNH-48HC 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-66HS and Tongwei TWMNH-48HC?
Tongwei TWMNH-66HS has a 30 years power warranty; Tongwei TWMNH-48HC 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-66HS and Tongwei TWMNH-48HC bifacial panels?
Both Tongwei TWMNH-66HS and Tongwei TWMNH-48HC 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.