We plan to connect shore power (primary) and generator (aux) and send output to inverter/charger, any potential problems?

I don’t see a problem, but as a disclaimer, I am not an electrician.

Since this has a battery that you can’t replace how long does it last?

There is no battery in this switch. This is clearly stated in the product specifications listed for this switch. I use this switch to toggle between 110V shore power and 110v inverter power on my boat. This is a safety measure that protects the diodes in my inverter from being destroyed if it was accidentally hit by an external source of 110V current. Once I unplug from shore power, i push the remote power switch on my inverter, and that Automatic Transfer Switch turns all by itself and feeds the 110V coming from my inverter to the outlets in the cabin. I believe this kind of switch can also be used to feed power to your home from a backup generator, but it would have to be one rated higher than 63A I'm not an electrician, but I think most homes are set up for 200A service. I hope this answer was helpful.

will this work in a 12 volt circuit? 2 - 12v power sources

The simple is answer is "No". It is not a relay, but rather a motor switch. The motor actuator operates on 110-120VAC 50-60Hz derived from the power being switched. 12VDC will not activate this. Of course, the "Manual" mode does not depend on the available power being switched. But the contacts designed to switch 63A of AC are not capable of switching as much DC current.

What is the product dimensions, esp. its width?

It is approximately 6 inches wide X 5 inches high X 4 inches deep I have this device on my boat and it is used to switch from shore power to inverter power and I am not near my boat so I can’t give you exact measurements but those numbers should be close enough for laying out your installation.

Manufacturer	Yaemart Corportation
Item Weight	2.99 pounds
Product Dimensions	6 x 6 x 6 inches
Style	2P 63A
Material	Plastic
Mounting Type	DIN Rail Mount
Switch Style	Temperature Switch, Toggle Switch
Batteries Included?	No
Batteries Required?	No

110V 2P 63A MCB type Mini Dual Power Automatic Transfer Switches Toggle Controller Change-Over Switch ATS Self Cast Conversion

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