The answer to 'how much to replace generator installation' is that the cost can vary widely depending on several factors. Generally, a full generator installation can range anywhere from $3,000 to $15,000 or more for a residential home. The exact price will depend on the size and type of generator, the complexity of the installation, the accessibility of the installation site, and the labor rates in your local area.
For example, a basic portable generator installation may cost $3,000-$5,000, while a whole-home standby generator with an automatic transfer switch could be $8,000-$15,000 or more. The cost also depends on whether you need to upgrade your electrical panel, run new wiring, or perform any site preparation work. It's best to get quotes from licensed electricians in your local area to get an accurate estimate for your specific needs.