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BH-640W vs BH 640W 18 of 19 identical Swap Change panels

Astronergy CHSM78N(DG)/F-BH-640W vs Astronergy CHSM78N(DG)/F-BH 640W

CHSM78N(DG)/F-BH-640W
640 Wp 22.90 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
Astronergy CHSM78N(DG)/F-BH 640W
CHSM78N(DG)/F-BH 640W
640 Wp 22.90 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

One difference, none of them an advantage

The largest is voltage at max power: 1.07 V apart. 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 BH-640W BH 640W Difference
Voltage at max power 46.79 V 47.86 V 1.07 V apart
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 (-0.290 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
BH-640W
21,473 kWh
BH 640W
21,473 kWh
Lifetime gap
No difference
Output when it is hot
Rated power carried across the range a module actually sees
Scenario BH-640W BH 640W
Standard test conditions 25 °C 100.0% of rated power 640 W 640 W
Cool, bright day 40 °C 95.7% of rated power 612 W 612 W
Typical summer roof 55 °C 91.3% of rated power 584 W 584 W
Hot roof 70 °C 87.0% of rated power 556 W 556 W
03

Full specification

Parameter BH-640W BH 640W Difference
Power and efficiency
Rated power 640 Wp 640 Wp Same
Module efficiency 22.90 % 22.90 % Same
Power density 229.0 Wp/m² 229.0 Wp/m² Same
Open-circuit voltage 56.61 V 56.88 V Effectively the same
Voltage at max power 46.79 V 47.86 V 1.07 V apart
Short-circuit current 14.35 A 14.14 A Effectively the same
Current at max power 13.68 A 13.37 A Effectively the same
Temperature
Temperature coefficient -0.290 %/°C -0.290 %/°C Same
Mechanical
Dimensions 2465x1134x30 mm 2465x1134x30 mm Same
Module area 2.795 m² 2.795 m² Same
Weight 34.7 kg 34.7 kg Same
Weight per kWp 54.2 kg/kWp 54.2 kg/kWp 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 TOPCon TOPCon Same
Cell type Monocrystalline Monocrystalline Same
Cell count 156 156 Same
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#2,359 vs #2,359
Tied - the same position in the database
Power density
#2,389 vs #2,389
Tied - the same position in the database
Heat behaviour
#2,165 vs #2,165
Tied - the same position in the database
Weight
#8,447 vs #8,447
Tied - the same position in the database
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#1,704 vs #1,704
Tied - the same position in the database
05

More useful comparisons

Open the full database
Same series, other bin
Astronergy CHSM78N(DG)/F-BH-640W vs Astronergy CHSM78N(DG)/F-BH 650W
4 differences, the largest is module efficiency
Same series, other bin
Astronergy CHSM78N(DG)/F-BH-640W vs Astronergy CHSM78N(DG)/F-BH-650W
3 differences, the largest is module efficiency
Same series, other bin
Astronergy CHSM78N(DG)/F-BH-640W vs Astronergy CHSM78N(DG)/F-BH 645W
2 differences, the largest is module efficiency
Same series, other bin
Astronergy CHSM78N(DG)/F-BH-640W vs Astronergy CHSM78N(DG)/F-BH-645W
One difference: module efficiency
Same series, other bin
Astronergy CHSM78N(DG)/F-BH-640W vs Astronergy CHSM78N(DG)/F-BH 635W
One difference: module efficiency
Same series, other bin
Astronergy CHSM78N(DG)/F-BH-640W vs Astronergy CHSM78N(DG)/F-BH-635W
One difference: module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: Astronergy CHSM78N(DG)/F-BH-640W or Astronergy CHSM78N(DG)/F-BH 640W?
According to our database: both panels are closely matched on key specs - the decision often comes down to price and local availability. See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Astronergy CHSM78N(DG)/F-BH-640W and Astronergy CHSM78N(DG)/F-BH 640W?
Astronergy CHSM78N(DG)/F-BH-640 W has a module efficiency of 22.90%, while Astronergy CHSM78N(DG)/F-BH 640 W is 22.90%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Astronergy CHSM78N(DG)/F-BH-640W use vs Astronergy CHSM78N(DG)/F-BH 640W?
Astronergy CHSM78N(DG)/F-BH-640 W uses TOPCon cells; Astronergy CHSM78N(DG)/F-BH 640 W 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 Astronergy CHSM78N(DG)/F-BH-640W and Astronergy CHSM78N(DG)/F-BH 640W?
Astronergy CHSM78N(DG)/F-BH-640 W has a 30 years power warranty; Astronergy CHSM78N(DG)/F-BH 640 W 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 Astronergy CHSM78N(DG)/F-BH-640W and Astronergy CHSM78N(DG)/F-BH 640W bifacial panels?
Both Astronergy CHSM78N(DG)/F-BH-640 W and Astronergy CHSM78N(DG)/F-BH 640 W 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 41 Astronergy 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.