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640W vs 650W 16 of 19 identical Swap Change panels

Astronergy CHSM78N(DG)/F-BH 640W vs Astronergy CHSM78N(DG)/F-BH 650W

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 650W
CHSM78N(DG)/F-BH 650W
650 Wp 23.30 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

650W leads on the differences that matter

The largest is module efficiency: 0.40 pp more efficient. 16 of 19 comparable parameters are identical.

See all 3 differences
How alike are they
16 of 19 comparable
parameters are identical
identical differs
01

What actually differs

3 of 19 parameters
Parameter 640W 650W Difference
Module efficiency 22.90 % 23.30 % 0.40 pp more efficient
Power density 229.0 Wp/m² 232.5 Wp/m² 3.6 Wp/m² higher
Rated power 640 Wp 650 Wp 10 W more power
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.
640W
21,473 kWh
650W
21,809 kWh
Lifetime gap
336 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 640W 650W
Standard test conditions 25 °C 100.0% of rated power 640 W 650 W
Cool, bright day 40 °C 95.7% of rated power 612 W 622 W
Typical summer roof 55 °C 91.3% of rated power 584 W 593 W
Hot roof 70 °C 87.0% of rated power 556 W 565 W
03

Full specification

Parameter 640W 650W Difference
Power and efficiency
Rated power 640 Wp 650 Wp +10 W for 650W
Module efficiency 22.90 % 23.30 % +0.40 pp for 650W
Power density 229.0 Wp/m² 232.5 Wp/m² +3.6 Wp/m² for 650W
Open-circuit voltage 56.88 V 57.28 V Effectively the same
Voltage at max power 47.86 V 48.20 V Effectively the same
Short-circuit current 14.14 A 14.26 A Effectively the same
Current at max power 13.37 A 13.49 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 53.4 kg/kWp Effectively the 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 #1,017
650W leads by 1,342 places
Power density
#2,389 vs #1,222
650W leads by 1,167 places
Heat behaviour
#2,165 vs #2,165
Tied - the same position in the database
Weight
#8,447 vs #7,283
650W leads by 1,164 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#1,704 vs #1,318
650W leads by 386 places
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
3 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-645W
One difference: module efficiency
Same series, other bin
Astronergy CHSM78N(DG)/F-BH 640W vs Astronergy CHSM78N(DG)/F-BH-640W
One difference: voltage at max power
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
2 differences, the largest is 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 650W?
According to our database: Astronergy CHSM78N(DG)/F-BH 650 W has higher module efficiency (23.30% vs 22.90%). 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 650W?
Astronergy CHSM78N(DG)/F-BH 640 W has a module efficiency of 22.90%, while Astronergy CHSM78N(DG)/F-BH 650 W is 23.30%. 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 650W?
Astronergy CHSM78N(DG)/F-BH 640 W uses TOPCon cells; Astronergy CHSM78N(DG)/F-BH 650 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 650W?
Astronergy CHSM78N(DG)/F-BH 640 W has a 30 years power warranty; Astronergy CHSM78N(DG)/F-BH 650 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 650W bifacial panels?
Both Astronergy CHSM78N(DG)/F-BH 640 W and Astronergy CHSM78N(DG)/F-BH 650 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.

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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.