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645 vs 645W 19 of 19 identical Swap Change panels

Astronergy CHSM78N(DG)/F-BH-645 vs Astronergy CHSM78N(DG)/F-BH-645W

Astronergy CHSM78N(DG)/F-BH-645
CHSM78N(DG)/F-BH-645
645 Wp 23.10 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
CHSM78N(DG)/F-BH-645W
645 Wp 23.10 % TOPCon Bifacial
Open panel page Datasheet PDF
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
identical differs
01

What actually differs

0 of 19 parameters

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 (-0.290 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
645
21,641 kWh
645W
21,641 kWh
Lifetime gap
No difference
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 645 645W
Standard test conditions 25 °C 100.0% of rated power 645 W 645 W
Cool, bright day 40 °C 95.7% of rated power 617 W 617 W
Typical summer roof 55 °C 91.3% of rated power 589 W 589 W
Hot roof 70 °C 87.0% of rated power 561 W 561 W
03

Full specification

Parameter 645 645W Difference
Power and efficiency
Rated power 645 Wp 645 Wp Same
Module efficiency 23.10 % 23.10 % Same
Power density 230.7 Wp/m² 230.7 Wp/m² Same
Open-circuit voltage 56.81 V 56.81 V Same
Voltage at max power 46.95 V 46.95 V Same
Short-circuit current 14.43 A 14.43 A Same
Current at max power 13.74 A 13.74 A 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 53.8 kg/kWp 53.8 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
#1,570 vs #1,570
Tied - the same position in the database
Power density
#1,654 vs #1,654
Tied - the same position in the database
Heat behaviour
#2,165 vs #2,165
Tied - the same position in the database
Weight
#7,876 vs #7,876
Tied - the same position in the database
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#1,496 vs #1,496
Tied - the same position in the database
05

More useful comparisons

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

Written summary

07

Questions about this pairing

Which panel is better: Astronergy CHSM78N(DG)/F-BH-645 or Astronergy CHSM78N(DG)/F-BH-645W?
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-645 and Astronergy CHSM78N(DG)/F-BH-645W?
Astronergy CHSM78N(DG)/F-BH-645 has a module efficiency of 23.10%, while Astronergy CHSM78N(DG)/F-BH-645 W is 23.10%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Astronergy CHSM78N(DG)/F-BH-645 use vs Astronergy CHSM78N(DG)/F-BH-645W?
Astronergy CHSM78N(DG)/F-BH-645 uses TOPCon cells; Astronergy CHSM78N(DG)/F-BH-645 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-645 and Astronergy CHSM78N(DG)/F-BH-645W?
Astronergy CHSM78N(DG)/F-BH-645 has a 30 years power warranty; Astronergy CHSM78N(DG)/F-BH-645 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-645 and Astronergy CHSM78N(DG)/F-BH-645W bifacial panels?
Both Astronergy CHSM78N(DG)/F-BH-645 and Astronergy CHSM78N(DG)/F-BH-645 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.