Electrical System - Power Inverters

We're planning on installing two power inverters in The Office, a primary 1750w and a backup secondary 3000w unit. They'll both be tied into the automatic transfer switch but have a power/selector switch located at the electrical panel.
Here is a sketch my brother drew up for how we're going to wire them up. Inverter #1 will be the primary inverter. When you switch Inverter #2 on it will open the AC relay. The feed to the transfer switch will then be fed from Inverter #2.
Here is a sketch my brother drew up for how we're going to wire them up. Inverter #1 will be the primary inverter. When you switch Inverter #2 on it will open the AC relay. The feed to the transfer switch will then be fed from Inverter #2.