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MST12R620HN3G vs MST12660HP3G 4 of 18 identical Swap Change panels

Mission Solar MST12R620HN3G vs Mission Solar MST12660HP3G

Mission Solar
MST12R620HN3G
620 Wp 23.00 % N-type Bifacial
Open panel page Datasheet PDF
VS
Mission Solar
MST12660HP3G
660 Wp 21.20 % PERC Bifacial
Open panel page Datasheet PDF
The verdict

MST12R620HN3G leads on the differences that matter

The largest is module efficiency: 1.80 pp more efficient. 4 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.

See all 14 differences
How alike are they
4 of 18 comparable
parameters are identical
identical differs not published
01

What actually differs

14 of 18 parameters
Parameter MST12R620HN3G MST12660HP3G Difference
Module efficiency 23.00 % 21.20 % 1.80 pp more efficient
Temperature coefficient -0.290 %/°C -0.340 %/°C 0.050 %/°C better in heat
Rated power 620 Wp 660 Wp 40 W more power
Power density 229.5 Wp/m² 212.5 Wp/m² 17.1 Wp/m² higher
Weight 33.0 kg 38.7 kg 5.7 kg lighter
Weight per kWp 53.2 kg/kWp 58.6 kg/kWp 5.4 kg/kWp lighter
Short-circuit current 16.26 A 18.45 A 2.19 A apart
Module area 2.701 m² 3.106 m² 0.405 m² apart
Open-circuit voltage 48.50 V 45.90 V 2.60 V apart
Cell technology N-type PERC N-type vs PERC
Annual degradation 0.40 %/yr 0.45 %/yr 0.05 %/yr slower
Current at max power 15.41 A 17.35 A 1.94 A apart
Voltage at max power 40.24 V 38.10 V 2.14 V apart
Dimensions 2382x1134x30 mm 2384x1303x35 mm 2382x1134x30 mm vs 2384x1303x35 mm
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
MST12R620HN3G
20,802 kWh
MST12660HP3G
21,734 kWh
Lifetime gap
932 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario MST12R620HN3G MST12660HP3G
Standard test conditions 25 °C 100.0% of rated power 620 W 660 W
Cool, bright day 40 °C 94.9% of rated power 593 W 626 W
Typical summer roof 55 °C 89.8% of rated power 566 W 593 W
Hot roof 70 °C 84.7% of rated power 539 W 559 W
03

Full specification

Parameter MST12R620HN3G MST12660HP3G Difference
Power and efficiency
Rated power 620 Wp 660 Wp +40 W for MST12660HP3G
Module efficiency 23.00 % 21.20 % +1.80 pp for MST12R620HN3G
Power density 229.5 Wp/m² 212.5 Wp/m² +17.1 Wp/m² for MST12R620HN3G
Open-circuit voltage 48.50 V 45.90 V 2.60 V apart
Voltage at max power 40.24 V 38.10 V 2.14 V apart
Short-circuit current 16.26 A 18.45 A 2.19 A apart
Current at max power 15.41 A 17.35 A 1.94 A apart
Temperature
Temperature coefficient -0.290 %/°C -0.340 %/°C +0.050 %/°C for MST12R620HN3G
Mechanical
Dimensions 2382x1134x30 mm 2384x1303x35 mm 2382x1134x30 mm vs 2384x1303x35 mm
Module area 2.701 m² 3.106 m² 0.405 m² apart
Weight 33.0 kg 38.7 kg -5.7 kg for MST12R620HN3G
Weight per kWp 53.2 kg/kWp 58.6 kg/kWp -5.4 kg/kWp for MST12R620HN3G
Warranty and degradation
Product warranty - - Neither datasheet publishes this
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.40 %/yr 0.45 %/yr -0.05 %/yr for MST12R620HN3G
Technology
Cell technology N-type PERC N-type vs PERC
Cell type Monocrystalline Monocrystalline Same
Cell count 132 132 Same
Bifacial Yes Yes Same
04

Against the whole database

14,129 panels
Efficiency
#1,970 vs #9,145
MST12R620HN3G leads by 7,175 places
Power density
#2,243 vs #9,028
MST12R620HN3G leads by 6,785 places
Heat behaviour
#2,220 vs #8,846
MST12R620HN3G leads by 6,626 places
Weight
#7,129 vs #11,906
MST12R620HN3G leads by 4,777 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#5,028 vs #5,713
MST12R620HN3G leads by 685 places
05

More useful comparisons

Open the full database
Same series, other bin
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Mission Solar MST12R620HN3G vs Mission Solar MST12R615HN3G
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Mission Solar MST12R620HN3G vs Mission Solar MST12R610HN3G
3 differences, the largest is module efficiency
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Mission Solar
Mission Solar MST12660HP3G vs Mission Solar MST12670HP3G
3 differences, the largest is module efficiency
Same series, other bin
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Mission Solar MST12660HP3G vs Mission Solar MST12665HP3G
One difference: module efficiency
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Mission Solar
Mission Solar MST12R620HN3G vs Mission Solar MSH10-595HN4G
8 differences, the largest is rated power
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Mission Solar MST12R620HN3G vs Mission Solar MSI10-590HN4G
9 differences, the largest is rated power
06

Written summary

07

Questions about this pairing

Which panel is better: Mission Solar MST12R620HN3G or Mission Solar MST12660HP3G?
According to our database: Mission Solar MST12R620HN3G has higher module efficiency (23.00% vs 21.20%); Mission Solar MST12R620HN3G tolerates heat better (temp coeff -0.290%/°C vs -0.340%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Mission Solar MST12R620HN3G and Mission Solar MST12660HP3G?
Mission Solar MST12R620HN3G has a module efficiency of 23.00%, while Mission Solar MST12660HP3G is 21.20%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Mission Solar MST12R620HN3G use vs Mission Solar MST12660HP3G?
Mission Solar MST12R620HN3G uses N-type cells; Mission Solar MST12660HP3G 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 Mission Solar MST12R620HN3G and Mission Solar MST12660HP3G?
Mission Solar MST12R620HN3G has a 30 years power warranty; Mission Solar MST12660HP3G 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 Mission Solar MST12R620HN3G and Mission Solar MST12660HP3G bifacial panels?
Both Mission Solar MST12R620HN3G and Mission Solar MST12660HP3G 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 4 Mission 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.