For the most accurate, detailed estimate, we strongly recommend that you contact us, your local KOHLER Generator dealer, and schedule a no-charge site visit with one of our Generator Specialists; we can analyze your home and/or business’ electrical load and lifestyle/workstyle needs, and then specify & install your generator system. However, if just getting a rough idea of what size your home or business might require is enough, you can use this Sizing Tool to get an idea of your power requirements.