A backup generator can be used as a primary power source, but it is typically meant to be used only during power outages as a backup power source. This is because backup generator are designed to provide temporary power during an emergency situation and may not have the capacity to power your entire facility on a regular basis. Additionally, backup generators are usually powered by gasoline or diesel, which can become costly if used as a primary power source. If a primary power source is needed, it's more common to use a larger and more robust generator that's known as a standby generator, that can run constantly and connected to the grid. It's important to work with a professional electrician or contractor who can help you assess your specific needs and recommend the best backup generator solution for your facility.