Tongwei TWMNH-66HS vs Tongwei TWMNH-66HD
VS
The verdict
Identical on every published parameter
All 18 comparable parameters agree, with 1 more left out because at least one datasheet does not publish it. 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
18
of 18 comparable
parameters are identical
parameters are identical
identical
differs
not published
01
0 of 18 parameters
What actually differs
Every comparable parameter agrees. The full specification is below.
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
66HD
20,802 kWh
Lifetime gap
168 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
66HS
66HD
Standard test conditions
25 °C
100.0% of rated power
625 W
620 W
Cool, bright day
40 °C
95.8% of rated power
599 W
594 W
Typical summer roof
55 °C
91.6% of rated power
573 W
568 W
Hot roof
70 °C
87.4% of rated power
546 W
542 W
03
Full specification
Parameter
66HS
66HD
Difference
Power and efficiency
Rated power
625 Wp
620 Wp
Effectively the same
Module efficiency
23.14 %
22.95 %
Effectively the same
Power density
231.4 Wp/m²
229.5 Wp/m²
Effectively the same
Open-circuit voltage
49.25 V
49.10 V
Effectively the same
Voltage at max power
40.77 V
40.82 V
Effectively the same
Short-circuit current
16.14 A
16.06 A
Effectively the same
Current at max power
15.33 A
15.19 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
46.8 kg/kWp
Effectively the same
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
#1,509
vs
#2,268
66HS leads by 759 places
Power density
#1,513
vs
#2,191
66HS leads by 678 places
Heat behaviour
#1,309
vs
#1,309
Tied - the same position in the database
Weight
#1,141
vs
#1,343
66HS leads by 202 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#1,789
vs
#2,013
66HS leads by 224 places
05
Open the full database
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Tongwei TWMNH-66HS vs Tongwei TWMNF-66HD750
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06
Written summary
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07
Questions about this pairing
Which panel is better: Tongwei TWMNH-66HS or Tongwei TWMNH-66HD?
According to our database: Tongwei TWMNH-66HS has higher module efficiency (23.14% vs 22.95%). 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-66HD?
Tongwei TWMNH-66HS has a module efficiency of 23.14%, while Tongwei TWMNH-66HD is 22.95%. 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-66HD?
Tongwei TWMNH-66HS uses TOPCon cells; Tongwei TWMNH-66HD 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-66HD?
Tongwei TWMNH-66HS has a 30 years power warranty; Tongwei TWMNH-66HD 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-66HD bifacial panels?
Both Tongwei TWMNH-66HS and Tongwei TWMNH-66HD 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.
Shop prices: See 71 Tongwei 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.