Thanks kritios. I used a smaller version of the automated setup last year and it worked well. The sides rolled on schedule and the fans were controlled. The greenhouse has seen worse than this. I'm getting more confident in what it can take.
AC used for,
1x 24v power supply and 1 110v / 24v DPDT relay for roll up sides
1x 12v power supply and 1 110v / 12v DPDT relay for 12" ridge vent actuator.
1x 12v Power supply for 3 24v dc switches controlling irrigation valves and pumps