Generator Installation in Hattiesburg, MS

Most Hattiesburg homes need between 14 kW and 22 kW to run essential systems during a summer outage, including central AC. A 2,000-square-foot home with a 3.5-ton AC unit, an electric water heater, a refrigerator, and lights draws roughly 14-18 kW under normal load. If you want to run everything at once, including an electric range or clothes dryer, you'll need the upper end of that range or a larger unit. We do a load calculation before recommending a generator size, so you're not guessing.

Standby generator installations in Hattiesburg and unincorporated Forrest County require an electrical permit. The permit covers the transfer switch wiring, the panel work, and the outdoor disconnect. Without a permit, the installation won't pass inspection, and some homeowners' insurance policies exclude unpermitted electrical work from coverage. Mr. Electric pulls the permit as part of every standby generator job.

In Hattiesburg, natural gas is the most convenient option if your home already has a gas line. The generator runs off the same supply as your furnace or range, and you don't have to manage fuel storage. Propane is the better fit for homes in rural areas of Lamar County, Purvis, or Carriere that don't have access to natural gas service. A 500-gallon propane tank provides roughly four to seven days of full-load runtime for a typical standby generator. We work with local LP suppliers to coordinate tank sizing and placement.

The transfer switch continuously monitors incoming utility power. The moment the utility power drops, the switch signals the generator to start. Within about 10 to 20 seconds, the switch transfers your home's circuits to generator power. When utility power returns, the switch transfers back and shuts down the generator. This happens without any input from you. The transfer switch also prevents your generator from back-feeding electricity onto the utility lines, which protects line workers and is required by the NEC.

Plugging a generator directly into a wall outlet, sometimes called back-feeding, is illegal and dangerous. It bypasses your panel's protection and can send voltage back onto utility lines while they're being repaired. Mississippi electrical code requires either an approved transfer switch or an interlock kit installed at the panel to safely connect a portable generator. Both options allow you to run selected circuits without risk to your wiring or anyone working on the lines outside.

Costs vary by generator type, size, and site conditions. A transfer switch or interlock kit installation for a portable generator will generally cost less than installing a whole-home standby generator with an automatic transfer switch, concrete pad, electrical connections, and gas line work. We provide a written quote before any work begins, so you'll have an exact number for your specific setup before you commit.

Before our backup system installation team arrives, confirm you know where your main electrical panel and gas shutoff are located. If you're installing a standby unit, pick a location at least five feet from any door, window, or opening per code requirements, and think about where the gas or propane line will run. Our Hattiesburg electricians walk the site before starting and flag any clearance or code issues during the estimate. In areas with newer construction, most installs are straightforward; however, older homes in established Hattiesburg neighborhoods may need a panel evaluation first.

Call Mr. Electric of Hattiesburg’s office or book online through our scheduling page to set up a home consultation appointment for your backup power source. We'll confirm your address, the type of generator you're considering, and any site-specific details before the visit. Our Hattiesburg electricians cover the Pine Belt, including Petal, Oak Grove, Purvis, McHenry, Ellisville, Poplarville, Picayune, Wiggins, and surrounding communities. We'll give you a flat-rate quote and walk you through the installation timeline so you know exactly what to expect. Contact us today for your electrical safety and generator needs.