Alpha ESS SMILE-G3-S3.6 Installation, Operation & Maintenance Manual page 38

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f. After cleaning the dust and other objects from the two holes, place 2 wall anchors
into the holes, then move the battery back into the mounting position and attach the
battery wall-securing bracket to the wall using the SW10 hexagon screws provided.
Please use a level to ensure that the wall bracket and battery are mounted horizontally
and not at any angle.
For mounting multiple batteries, follow the same procedure as above.
If you install extra batteries by side, keep the distance between two batteries greater
than 300mm. You can install additional batteries up to 6 total batteries in a system.