Tongwei TWMNH-66HD620 vs Tongwei TWMNH-66HD625
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 (-0.280 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
66HD620
20,802 kWh
66HD625
20,970 kWh
Lifetime gap
168 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
66HD620
66HD625
Standard test conditions
25 °C
100.0% of rated power
620 W
625 W
Cool, bright day
40 °C
95.8% of rated power
594 W
599 W
Typical summer roof
55 °C
91.6% of rated power
568 W
573 W
Hot roof
70 °C
87.4% of rated power
542 W
546 W
03
Full specification
Parameter
66HD620
66HD625
Difference
Power and efficiency
Rated power
620 Wp
625 Wp
Effectively the same
Module efficiency
23.00 %
23.10 %
Effectively the same
Power density
229.5 Wp/m²
231.4 Wp/m²
Effectively the same
Open-circuit voltage
49.10 V
49.30 V
Effectively the same
Voltage at max power
40.82 V
40.96 V
Effectively the same
Short-circuit current
16.06 A
16.12 A
Effectively the same
Current at max power
15.19 A
15.26 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
32.5 kg
32.5 kg
Same
Weight per kWp
52.4 kg/kWp
52.0 kg/kWp
Effectively the same
Warranty and degradation
Product warranty
12 yrs
12 yrs
Same
Performance warranty
30 yrs
30 yrs
Same
Annual degradation
0.40 %/yr
0.40 %/yr
Same
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
#1,919
vs
#1,570
66HD625 leads by 349 places
Power density
#2,191
vs
#1,513
66HD625 leads by 678 places
Heat behaviour
#1,309
vs
#1,309
Tied - the same position in the database
Weight
#5,893
vs
#5,417
66HD625 leads by 476 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#2,525
vs
#2,264
66HD625 leads by 261 places
05
Open the full database
More useful comparisons
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Tongwei TWMNH-66HD620 vs Tongwei TWMNF-66HD750
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Tongwei TWMNH-66HD620 vs Tongwei TWMNF-66HD745
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Tongwei TWMNH-66HD620 vs Tongwei TWMNF-66HD740
9 differences, the largest is module efficiency
Same series, other bin
Tongwei TWMNH-66HD620 vs Tongwei TWMHF-66HD740X
14 differences, the largest is module efficiency
Same series, other bin
Tongwei TWMNH-66HD620 vs Tongwei TWMNF-66HD735
8 differences, the largest is module efficiency
Same series, other bin
Tongwei TWMNH-66HD620 vs Tongwei TWMHF-66HD735X
14 differences, the largest is temperature coefficient
06
Written summary
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07
Questions about this pairing
Which panel is better: Tongwei TWMNH-66HD620 or Tongwei TWMNH-66HD625?
According to our database: Tongwei TWMNH-66HD625 has higher module efficiency (23.10% vs 23.00%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Tongwei TWMNH-66HD620 and Tongwei TWMNH-66HD625?
Tongwei TWMNH-66HD620 has a module efficiency of 23.00%, while Tongwei TWMNH-66HD625 is 23.10%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Tongwei TWMNH-66HD620 use vs Tongwei TWMNH-66HD625?
Tongwei TWMNH-66HD620 uses TOPCon cells; Tongwei TWMNH-66HD625 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-66HD620 and Tongwei TWMNH-66HD625?
Tongwei TWMNH-66HD620 has a 30 years power warranty; Tongwei TWMNH-66HD625 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-66HD620 and Tongwei TWMNH-66HD625 bifacial panels?
Both Tongwei TWMNH-66HD620 and Tongwei TWMNH-66HD625 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 72 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.