I have several tools that can have the wiring of the motor changed from 110V to 220V.  This draws half the current and helps the motors run more efficiently.  Since I have to change the circuit breaker box to handle the tie-in for the solar electric project, I decided this was a good time to make the move to 220V where possible.

This is the original breaker box - about 20 years old, installed upside down and without enough breaker slots for the solar tie-in.

My electrician told me what kind of wire to get and how to do the rough-in.  I located the outlet positions, cut the drywall and ran the wire back to near the breaker box. The solar panel installation included the cost and wiring of a secondary breaker box, so I'll leverage that for the new circuits.

The first picture is the new back wall of the shop with three new 110V plugs, to the right is the wire waiting for the 220V for the dust collector. Bottom left are two wires that will be run within a conduit from the ceiling to the floor. One wire takes 220V to the jointer, the other takes 110V to the table saw. I decided to run this conduit from the ceiling rather than dig a trench in the concrete slab.  Last are all of the new wires hanging from the rafter waiting for the new circuit breaker box.

The electric is all now finished - breaker box, breakers, wiring and 110V and 220V outlets.  I've also rewired the Jet bandsaw, Jet dust collector, Rikon jointer and radial arm saw to 220V.

I've progressed to the point to set the final position of the table saw and jointer, so I can now run the power down from the attic to an outlet box, and plug in the saw and jointer. I mounted a box in the ceiling next to the dust collector pipe so I can tie them together. I then bolted two outlet boxes together and screwed them down to the concrete.  It seems nobody rents the hot blanket that the solar installers used to shape the plastic conduit pipe, so I gently heated the bends with a propane torch and it seemed to work well.  I wired up the 110V outlet for the saw and the 220V outlet for the jointer.