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470/MR vs 445/MR 14 of 19 identical Swap Change panels

JA Solar JAM72S20-470/MR vs JA Solar JAM72S20-445/MR

JA Solar JAM72S20-470/MR
JAM72S20-470/MR
470 Wp 21.20 % PERC
Open panel page Datasheet PDF
VS
JA Solar JAM72S20-445/MR
JAM72S20-445/MR
445 Wp 20.00 % PERC
Open panel page Datasheet PDF
The verdict

470/MR leads on the differences that matter

The largest is module efficiency: 1.20 pp more efficient. 14 of 19 comparable parameters are identical.

See all 5 differences
How alike are they
14 of 19 comparable
parameters are identical
identical differs
01

What actually differs

5 of 19 parameters
Parameter 470/MR 445/MR Difference
Module efficiency 21.20 % 20.00 % 1.20 pp more efficient
Power density 211.5 Wp/m² 200.3 Wp/m² 11.3 Wp/m² higher
Rated power 470 Wp 445 Wp 25 W more power
Weight per kWp 52.1 kg/kWp 55.1 kg/kWp 2.9 kg/kWp lighter
Voltage at max power 42.69 V 41.21 V 1.48 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 (-0.350 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
470/MR
15,232 kWh
445/MR
14,422 kWh
Lifetime gap
810 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 470/MR 445/MR
Standard test conditions 25 °C 100.0% of rated power 470 W 445 W
Cool, bright day 40 °C 94.8% of rated power 445 W 422 W
Typical summer roof 55 °C 89.5% of rated power 421 W 398 W
Hot roof 70 °C 84.2% of rated power 396 W 375 W
03

Full specification

Parameter 470/MR 445/MR Difference
Power and efficiency
Rated power 470 Wp 445 Wp +25 W for 470/MR
Module efficiency 21.20 % 20.00 % +1.20 pp for 470/MR
Power density 211.5 Wp/m² 200.3 Wp/m² +11.3 Wp/m² for 470/MR
Open-circuit voltage 50.31 V 49.56 V Effectively the same
Voltage at max power 42.69 V 41.21 V 1.48 V apart
Short-circuit current 11.53 A 11.32 A Effectively the same
Current at max power 11.01 A 10.80 A Effectively the same
Temperature
Temperature coefficient -0.350 %/°C -0.350 %/°C Same
Mechanical
Dimensions 2112x1052x35 mm 2112x1052x35 mm Same
Module area 2.222 m² 2.222 m² Same
Weight 24.5 kg 24.5 kg Same
Weight per kWp 52.1 kg/kWp 55.1 kg/kWp -2.9 kg/kWp for 470/MR
Warranty and degradation
Product warranty 12 yrs 12 yrs Same
Performance warranty 25 yrs 25 yrs Same
Annual degradation 0.55 %/yr 0.55 %/yr Same
Technology
Cell technology PERC PERC Same
Cell type Monocrystalline Monocrystalline Same
Cell count 144 144 Same
Bifacial No No Same
04

Against the whole database

14,005 panels
Efficiency
#9,076 vs #12,214
470/MR leads by 3,138 places
Power density
#9,193 vs #12,162
470/MR leads by 2,969 places
Heat behaviour
#10,419 vs #10,419
Tied - the same position in the database
Weight
#5,602 vs #9,435
470/MR leads by 3,833 places
Warranty
#9,798 vs #9,798
Tied - the same position in the database
Overall
#10,418 vs #11,694
470/MR leads by 1,276 places
05

More useful comparisons

Open the full database
Same series, other bin
JA Solar JAM72S20-470/MR vs JA Solar JAM72S20-465/MR
One difference: module efficiency
Same series, other bin
JA Solar JAM72S20-470/MR vs JA Solar JAM72S20-460/MR
3 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM72S20-470/MR vs JA Solar JAM72S20-455/MR
3 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM72S20-470/MR vs JA Solar JAM72S20-450/MR
5 differences, the largest is module efficiency
Same manufacturer
JA Solar JAM72S20-470/MR vs JA Solar JAM66D46-740/LB
14 differences, the largest is module efficiency
Same manufacturer
JA Solar JAM72S20-470/MR vs JA Solar JAM66D46-735/LB
14 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: JA Solar JAM72S20-470/MR or JA Solar JAM72S20-445/MR?
According to our database: JA Solar JAM72S20-470/MR has higher module efficiency (21.20% vs 20.00%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of JA Solar JAM72S20-470/MR and JA Solar JAM72S20-445/MR?
JA Solar JAM72S20-470/MR has a module efficiency of 21.20%, while JA Solar JAM72S20-445/MR is 20.00%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does JA Solar JAM72S20-470/MR use vs JA Solar JAM72S20-445/MR?
JA Solar JAM72S20-470/MR uses PERC cells; JA Solar JAM72S20-445/MR 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 JA Solar JAM72S20-470/MR and JA Solar JAM72S20-445/MR?
JA Solar JAM72S20-470/MR has a 25 years power warranty; JA Solar JAM72S20-445/MR has a 25 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 391 JA Solar 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.