your assumption about the modules is correct however so far I have not been able to get them to communicate with the transfer switch .and the instructions are poorly written..I can't even figure out by their own instructions whether the damned thing is wirelessly communicating or not.. but so far I have no way to make it work .
At this time there is no such thing as a symphony 3 transfer switch. I would recommended adding a symphony 2 module to any 240 volt high wattage appliance (A/C, electric range or oven, hot water heater, etc.)
That would depend on what generator your using and the electrical requirements of your fish tank. Your best resource for that information will be through a local Briggs and Stratton service center.
Please locate a product model number and work with your local technician.
Greetings Todd, My name is Tom, also known as HD116 here and at Home Depot's How to Community found at the site above. Thank you for your question. You could hook either your wall oven or your dryer up to the other module. The GE 13 Watt generator 49324HD features Symphony 2 technology which allows you to create a "Hierarchy" or choose which high voltage appliances you wish to run in the order you choose when demand occurs. Each additional appliance does require a module, and the system can monitor up to 8 modules. If you have any further questions please contact GE's customer service for Standby Generators directly at 1-888-575-8226.
Please work with your local technician for further assistance.