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

Astronergy CHSM66RN(DG)/F-BH-650W vs Astronergy CHSM66RN(DG)/F-BH-640W

Astronergy CHSM66RN(DG)/F-BH-650W
CHSM66RN(DG)/F-BH-650W
650 Wp 24.10 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
Astronergy CHSM66RN(DG)/F-BH-640W
CHSM66RN(DG)/F-BH-640W
640 Wp 23.70 % 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 650W 640W Difference
Module efficiency 24.10 % 23.70 % 0.40 pp more efficient
Power density 240.6 Wp/m² 236.9 Wp/m² 3.7 Wp/m² higher
Rated power 650 Wp 640 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.
650W
21,809 kWh
640W
21,473 kWh
Lifetime gap
336 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 650W 640W
Standard test conditions 25 °C 100.0% of rated power 650 W 640 W
Cool, bright day 40 °C 95.7% of rated power 622 W 612 W
Typical summer roof 55 °C 91.3% of rated power 593 W 584 W
Hot roof 70 °C 87.0% of rated power 565 W 556 W
03

Full specification

Parameter 650W 640W Difference
Power and efficiency
Rated power 650 Wp 640 Wp +10 W for 650W
Module efficiency 24.10 % 23.70 % +0.40 pp for 650W
Power density 240.6 Wp/m² 236.9 Wp/m² +3.7 Wp/m² for 650W
Open-circuit voltage 49.87 V 49.57 V Effectively the same
Voltage at max power 42.24 V 41.99 V Effectively the same
Short-circuit current 16.58 A 16.42 A Effectively the same
Current at max power 15.39 A 15.24 A Effectively the same
Temperature
Temperature coefficient -0.290 %/°C -0.290 %/°C Same
Mechanical
Dimensions 2382x1134x30 mm 2382x1134x30 mm Same
Module area 2.701 m² 2.701 m² Same
Weight 31.6 kg 31.6 kg Same
Weight per kWp 48.7 kg/kWp 49.5 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 132 132 Same
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#219 vs #517
650W leads by 298 places
Power density
#233 vs #521
650W leads by 288 places
Heat behaviour
#2,165 vs #2,165
Tied - the same position in the database
Weight
#2,420 vs #2,987
650W leads by 567 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#866 vs #1,252
650W leads by 386 places
05

More useful comparisons

Open the full database
Same series, other bin
Astronergy CHSM66RN(DG)/F-BH-650W vs Astronergy CHSM66RN(DG)/F-BH-650
The same specification on paper
Same series, other bin
Astronergy CHSM66RN(DG)/F-BH-650W vs Astronergy CHSM66RN(DG)/F-BH-645W
One difference: module efficiency
Same series, other bin
Astronergy CHSM66RN(DG)/F-BH-650W vs Astronergy CHSM66RN(DG)/F-BH-645
One difference: module efficiency
Same series, other bin
Astronergy CHSM66RN(DG)/F-BH-650W vs Astronergy CHSM66RN(DG)/F-BH-640
3 differences, the largest is module efficiency
Same series, other bin
Astronergy CHSM66RN(DG)/F-BH-650W vs Astronergy CHSM66RN(DG)/F-BH-635W
3 differences, the largest is module efficiency
Same series, other bin
Astronergy CHSM66RN(DG)/F-BH-650W vs Astronergy CHSM66RN(DG)/F-BH-635
3 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: Astronergy CHSM66RN(DG)/F-BH-650W or Astronergy CHSM66RN(DG)/F-BH-640W?
According to our database: Astronergy CHSM66RN(DG)/F-BH-650 W has higher module efficiency (24.10% vs 23.70%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Astronergy CHSM66RN(DG)/F-BH-650W and Astronergy CHSM66RN(DG)/F-BH-640W?
Astronergy CHSM66RN(DG)/F-BH-650 W has a module efficiency of 24.10%, while Astronergy CHSM66RN(DG)/F-BH-640 W is 23.70%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Astronergy CHSM66RN(DG)/F-BH-650W use vs Astronergy CHSM66RN(DG)/F-BH-640W?
Astronergy CHSM66RN(DG)/F-BH-650 W uses TOPCon cells; Astronergy CHSM66RN(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 CHSM66RN(DG)/F-BH-650W and Astronergy CHSM66RN(DG)/F-BH-640W?
Astronergy CHSM66RN(DG)/F-BH-650 W has a 30 years power warranty; Astronergy CHSM66RN(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 CHSM66RN(DG)/F-BH-650W and Astronergy CHSM66RN(DG)/F-BH-640W bifacial panels?
Both Astronergy CHSM66RN(DG)/F-BH-650 W and Astronergy CHSM66RN(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.

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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.