I am an electrician by trade. When I built my garage (20 x24), I sized my panel for a 6hp/60 gallon single-stage compressor (20a/240v), a 120v welder (20a/120v), a four-post lift (30a/240v), 8 two-tube flourescent lighting fixtures on 1 15a circuit downstairs, 2 two-tube flourescent lighting...