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645W vs 665W 16 of 19 identical Swap Change panels

Amerisolar AS-8M132-HC-645W vs Amerisolar AS-8M132-HC-665W

Amerisolar
AS-8M132-HC-645W
645 Wp 20.76 % PERC
Open panel page Datasheet PDF
VS
Amerisolar
AS-8M132-HC-665W
665 Wp 21.41 % PERC
Open panel page Datasheet PDF
The verdict

665W leads on the differences that matter

The largest is module efficiency: 0.65 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 645W 665W Difference
Module efficiency 20.76 % 21.41 % 0.65 pp more efficient
Power density 207.6 Wp/m² 214.1 Wp/m² 6.4 Wp/m² higher
Rated power 645 Wp 665 Wp 20 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 (-0.340 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
645W
20,619 kWh
665W
21,259 kWh
Lifetime gap
640 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 645W 665W
Standard test conditions 25 °C 100.0% of rated power 645 W 665 W
Cool, bright day 40 °C 94.9% of rated power 612 W 631 W
Typical summer roof 55 °C 89.8% of rated power 579 W 597 W
Hot roof 70 °C 84.7% of rated power 546 W 563 W
03

Full specification

Parameter 645W 665W Difference
Power and efficiency
Rated power 645 Wp 665 Wp +20 W for 665W
Module efficiency 20.76 % 21.41 % +0.65 pp for 665W
Power density 207.6 Wp/m² 214.1 Wp/m² +6.4 Wp/m² for 665W
Open-circuit voltage 45.30 V 46.10 V Effectively the same
Voltage at max power 37.50 V 38.30 V Effectively the same
Short-circuit current 18.31 A 18.51 A Effectively the same
Current at max power 17.20 A 17.37 A Effectively the same
Temperature
Temperature coefficient -0.340 %/°C -0.340 %/°C Same
Mechanical
Dimensions 2384x1303x35 mm 2384x1303x35 mm Same
Module area 3.106 m² 3.106 m² Same
Weight 34.0 kg 34.0 kg Same
Weight per kWp 52.7 kg/kWp 51.1 kg/kWp Effectively the same
Warranty and degradation
Product warranty 20 yrs 20 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.60 %/yr 0.60 %/yr Same
Technology
Cell technology PERC PERC Same
Cell type Monocrystalline Monocrystalline Same
Cell count 132 132 Same
Bifacial No No Same
04

Against the whole database

14,129 panels
Efficiency
#10,690 vs #8,345
665W leads by 2,345 places
Power density
#10,638 vs #8,315
665W leads by 2,323 places
Heat behaviour
#8,846 vs #8,846
Tied - the same position in the database
Weight
#6,416 vs #4,495
665W leads by 1,921 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#2,596 vs #1,606
665W leads by 990 places
05

More useful comparisons

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Amerisolar AS-8M132-HC-645W vs Amerisolar AS-8M132-HC-650W
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06

Written summary

07

Questions about this pairing

Which panel is better: Amerisolar AS-8M132-HC-645W or Amerisolar AS-8M132-HC-665W?
According to our database: Amerisolar AS-8M132-HC-665 W has higher module efficiency (21.41% vs 20.76%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Amerisolar AS-8M132-HC-645W and Amerisolar AS-8M132-HC-665W?
Amerisolar AS-8M132-HC-645 W has a module efficiency of 20.76%, while Amerisolar AS-8M132-HC-665 W is 21.41%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Amerisolar AS-8M132-HC-645W use vs Amerisolar AS-8M132-HC-665W?
Amerisolar AS-8M132-HC-645 W uses PERC cells; Amerisolar AS-8M132-HC-665 W uses PERC. 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 Amerisolar AS-8M132-HC-645W and Amerisolar AS-8M132-HC-665W?
Amerisolar AS-8M132-HC-645 W has a 30 years power warranty; Amerisolar AS-8M132-HC-665 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.

Shop prices: See 3 Amerisolar 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.