The photo seems to indicate that there are no breakouts on the side of this item for the power to/from the panel. Where are the breakouts located?

There are three 3/4" knockouts; one on the rear @ about 1 o'clock and two on both sides. The box includes a PVC washer for using a 1/2" conduit. Regardless of what people report; the inlet is a L14-30R which is four prongs.