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Those are typically used for manually started gensets and the homeowner has to shut off high load circuits in the Main that the generator is not able to power before flipping the interlock to connect the genset to loads. That type of system is OK, if you're home to be able to fumble around in the dark, start and warm up a genset, then fumble your way to the basement in the dark with a flashlight with batteries that are almost dead, and flip all the breakers to bring it online.
More typical in residential standby power systems is auto-start gensets with an automatic transfer switch that disconnects critical circuits from the grid and connects them genset power. The auto-start partial house standby power systems leave the heavy loads connected to grid power and never actually disconnect the grid from the Main. The Generac EZ-Switch is an example of this type of load transfer switching.
Farms, factories, schools, hospitals and large businesses are typically the only applications where you will find transfer switches of sufficient quality and capacity to disconnect the grid from the Main and transfer loads to standby power. These types of transfer switches are minimum 200A rated for 50 kVA or larger gensets. The more expensive ones like Cummins PowerCommand systems cost over $100,000 because they sense when grid power comes back on, sync the generator with the grid after it's stable, then make the switch in under 16 milliseconds so inductive loads are not hit out-of-phase when the loads go back to grid power.
More expensive inverters like Schneider XW/XW+ series can AC couple with GT inverters and build a standalone mini-grid so your GT inverters can work during a power outage, and the XW/XW+ will use the "sold" power from the GT's to charge battery banks. But the cost to do this is astronomical and way beyond practicality for a residential GT system.
More typical in residential standby power systems is auto-start gensets with an automatic transfer switch that disconnects critical circuits from the grid and connects them genset power. The auto-start partial house standby power systems leave the heavy loads connected to grid power and never actually disconnect the grid from the Main. The Generac EZ-Switch is an example of this type of load transfer switching.
Farms, factories, schools, hospitals and large businesses are typically the only applications where you will find transfer switches of sufficient quality and capacity to disconnect the grid from the Main and transfer loads to standby power. These types of transfer switches are minimum 200A rated for 50 kVA or larger gensets. The more expensive ones like Cummins PowerCommand systems cost over $100,000 because they sense when grid power comes back on, sync the generator with the grid after it's stable, then make the switch in under 16 milliseconds so inductive loads are not hit out-of-phase when the loads go back to grid power.
More expensive inverters like Schneider XW/XW+ series can AC couple with GT inverters and build a standalone mini-grid so your GT inverters can work during a power outage, and the XW/XW+ will use the "sold" power from the GT's to charge battery banks. But the cost to do this is astronomical and way beyond practicality for a residential GT system.
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