It is easier to have a continuous row of solar panels if they are installed vertically.
Vertical wall mounted solar panels.
Of course not every home or roof is designed the same.
Installers have adapted pre existing mounting and racking technology or developed their own to install solar panels on the south facing walls of buildings.
Lower energy production means your installation will take longer to pay itself off lowering your roi and increasing the amount of time it takes to make your money back.
Also for those who live in snow heavy areas installing vertical solar panels can help with production.
Wall mounted solar arrays produce less but work in a pinch.
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Fewer rails are required to mount a solar panel vertically instead of horizontally.
Traditional solar arrays typically fall off in productivity during the winter but a wall mounted array will perform the best during this time.
On the other hand vertical solar panels are more likely to get washed when it rains.
There are high chances of dust accumulating over it which can impede the process of production of electricity.
The alaskan wall mounted array even outperforms the roof mounted array in overall annual production when snow is considered.
Vertical solar panels are sub optimal for solar production and that is the biggest issue facing vertical installation.
Installing solar panels is a money saving investment.