Manual generator is typically a portable style generator that is plugged into a generator outlet which feeds a manual transfer switch. When the power goes out, you manually transfer power from house power to generator power. A manual generator set up is usually a lower price point versus a fully automatic generator although some makes and models of portable generators can be close to the same cost as a automatic generator. Installation costs are definitely lower on a manual generator set up and are usually more straight forward.
However, it has some requirements: + be next to the outlet so you can plug it in + some may have to be pulled to start, and need gasoline throughout the outage, so it will require you to monitor the outage to know when to shut it down and transfer power back to normal house power. Therefore, if you don't mind doing everything manually the manual set up can save you some money and accomplish a lot of what you may want for a generator back up system such as keeping the lights on and saving the food in the refrigerator.
Automatic generator is generator than can automatically senses the power outage, starts the generator, and has your home back in power when the home power goes off. Price and installation cost are higher than the manual set up, but it delivers some advantages:
+ run on propane and natural gas saving you from having to fill the generator throughout the outage with gasoline.
+ can sense when the power comes back on and automatically shuts itself off and restores your home back to normal house power.
+ exercise itself weekly to keep the engines in good working order and ready for an outage.
+ can run your entire home or most of your home depending on the size of the generator.
+ can be very quiet these days as they are now as quiet as most heat pumps or A/C units.
+ will kick on even if you are not home so your food in the refrigerator and freezer will be saved plus keeping the home warm enough above freezing in long outages to keep plumbing safe.
In Manual Transfer Switches an operator affects the transfer by throwing a switch, while Automatic switches sense one of the sources has lost or gained power. Automatic Transfer Switches are often installed where a backup generator is located, so that the generator may provide temporary electrical power if the utility source fails.
A permanent magnet synchronous generator is a generator where the excitation field is provided by a permanent magnet instead of a coil. Synchronous generators are the majority source of commercial electrical energy. They are commonly used to convert the mechanical power output of steam turbines, gas turbines, reciprocating engines, hydro turbines and wind turbines into electrical power for the grid.