Ben,
On a side note, is all your shop electrical done in EMT? How do you like it? I'm thinking about doing my next shop that way and any new circuits in this shop.

What's going on with the 110V receptacles above the 220V outlet? Are they on the same circuit or just multiple circuits in the same conduit? If they are on the same circuit, you need to include any load that could running on 110 while the DC is running when determining your service size needed.