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MST12670HP3G vs MST12660HP3G 15 of 18 identical Swap Change panels

Mission Solar MST12670HP3G vs Mission Solar MST12660HP3G

Mission Solar
MST12670HP3G
670 Wp 21.60 % PERC Bifacial
Open panel page Datasheet PDF
VS
Mission Solar
MST12660HP3G
660 Wp 21.20 % PERC Bifacial
Open panel page Datasheet PDF
The verdict

MST12670HP3G leads on the differences that matter

The largest is module efficiency: 0.40 pp more efficient. 15 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.

See all 3 differences
How alike are they
15 of 18 comparable
parameters are identical
identical differs not published
01

What actually differs

3 of 18 parameters
Parameter MST12670HP3G MST12660HP3G Difference
Module efficiency 21.60 % 21.20 % 0.40 pp more efficient
Power density 215.7 Wp/m² 212.5 Wp/m² 3.2 Wp/m² higher
Rated power 670 Wp 660 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 (-0.340 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
MST12670HP3G
22,064 kWh
MST12660HP3G
21,734 kWh
Lifetime gap
330 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario MST12670HP3G MST12660HP3G
Standard test conditions 25 °C 100.0% of rated power 670 W 660 W
Cool, bright day 40 °C 94.9% of rated power 636 W 626 W
Typical summer roof 55 °C 89.8% of rated power 602 W 593 W
Hot roof 70 °C 84.7% of rated power 567 W 559 W
03

Full specification

Parameter MST12670HP3G MST12660HP3G Difference
Power and efficiency
Rated power 670 Wp 660 Wp +10 W for MST12670HP3G
Module efficiency 21.60 % 21.20 % +0.40 pp for MST12670HP3G
Power density 215.7 Wp/m² 212.5 Wp/m² +3.2 Wp/m² for MST12670HP3G
Open-circuit voltage 46.30 V 45.90 V Effectively the same
Voltage at max power 38.50 V 38.10 V Effectively the same
Short-circuit current 18.55 A 18.45 A Effectively the same
Current at max power 17.43 A 17.35 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 38.7 kg 38.7 kg Same
Weight per kWp 57.8 kg/kWp 58.6 kg/kWp Effectively the same
Warranty and degradation
Product warranty - - Neither datasheet publishes this
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.45 %/yr 0.45 %/yr Same
Technology
Cell technology PERC PERC Same
Cell type Monocrystalline Monocrystalline Same
Cell count 132 132 Same
Bifacial Yes Yes Same
04

Against the whole database

14,129 panels
Efficiency
#7,716 vs #9,145
MST12670HP3G leads by 1,429 places
Power density
#7,708 vs #9,028
MST12670HP3G leads by 1,320 places
Heat behaviour
#8,846 vs #8,846
Tied - the same position in the database
Weight
#11,486 vs #11,906
MST12670HP3G leads by 420 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#4,941 vs #5,713
MST12670HP3G leads by 772 places
05

More useful comparisons

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06

Written summary

07

Questions about this pairing

Which panel is better: Mission Solar MST12670HP3G or Mission Solar MST12660HP3G?
According to our database: Mission Solar MST12670HP3G has higher module efficiency (21.60% vs 21.20%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Mission Solar MST12670HP3G and Mission Solar MST12660HP3G?
Mission Solar MST12670HP3G has a module efficiency of 21.60%, 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 MST12670HP3G use vs Mission Solar MST12660HP3G?
Mission Solar MST12670HP3G uses PERC 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 MST12670HP3G and Mission Solar MST12660HP3G?
Mission Solar MST12670HP3G 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 MST12670HP3G and Mission Solar MST12660HP3G bifacial panels?
Both Mission Solar MST12670HP3G 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.