Generac Power Systems PowerPact 6561 Installation Notes page 14

 The genset must be installed on a level surface. The base frame must be level within 1/2 inch all
around (Nexus manual says 2").
 The generator is typically placed on pea gravel or crushed stone.
 Pea gravel - must be 4" (102mm) deep, compacted and level. You may build a frame around the area
that you want to install the generator. Also, use something to inhibit weed growth through the gravel.

Check local codes if a concrete slab is required. If a concrete base slab is required.
 Concrete base slab which should exceed the length and width of the generator by a minimum of six
(6) inches (0.152 meters) on all sides.

There are four mounting holes in the base of the generator to secure it to the concrete.
 3" GenPad - Level and compact the ground where the pad will be placed. Lay the GenPad on the
ground. Bolt the generator to the pad.
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