The post is sunk directly into concrete (often ~3 feet deep) for maximum stability.
For heavy gates (up to 20ft), 6x6 steel posts are often recommended to prevent sagging. GATE OPENER
Some installers create custom posts from 2-inch square pipe, often welding them at a 22.5-degree angle to make keypad faces easier to read. The post is sunk directly into concrete (often
Posts can also serve as the mounting point for solar panels used to charge the gate's battery system in off-grid setups. GATE OPENER
These are the pillars that physically hold the gate and the automated opener arm.