Whole-home generator in Jacksonville, FL

Generator sizing should be based on actual home electrical load via a Manual J equivalent calculation, not "biggest available." Typical Jacksonville home loads are 14-22 kW for whole-home backup. Smaller systems (8-14 kW) cover essential circuits only (refrigerator, freezer, sump pump, partial HVAC); larger systems (20-26 kW) cover whole-home including AC under hurricane-recovery conditions.

The load calculation accounts for: HVAC running load (typically 4-8 kW for a Jacksonville-sized home AC), well pump if applicable, sump pump if applicable, refrigeration loads, lighting, and selected receptacle circuits. Larger generators add cost without adding meaningful resilience for most Jacksonville homes.

What shapes generator selection: brand (Generac, Kohler, Cummins are the dominant residential brands; each has authorized installer networks), fuel source (natural gas vs propane), enclosure (sound-attenuating enclosures matter for residential install proximity), warranty terms (typical 5-year limited warranty on the generator engine + 2-year on installation labor).

What to ask the contractor: written load calculation, generator brand and model, transfer-switch type (automatic transfer switch is standard; manual transfer-switch is rarely the right choice for unattended hurricane operation), and post-install commissioning protocol (the generator should run for 30-60 minutes under load to verify all subsystems).

Most Jacksonville-area generators run on natural gas (TECO Peoples Gas service) or propane. The choice depends on service availability and homeowner preference:

Natural gas: cleaner-running, lower fuel cost during normal operation, no on-site fuel storage required. Available in most Duval County homes with established TECO Peoples Gas service. The generator is permanently connected to the gas line; fuel is essentially unlimited as long as gas service remains operational. Caveat: in extended hurricane events, gas service can be disrupted for short periods, though gas service typically restores faster than electric.

Propane: required where natural gas isn't available (outer-suburban Duval, some St. Johns County areas). On-site tank (typical 500-1000 gallons for whole-home generators) holds 7-14+ days of generator fuel at typical load. Higher fuel cost per BTU than natural gas. Tank refill scheduling matters during multi-week post-hurricane scenarios.

For either fuel source, the gas/propane line installation is a separate licensed activity from electrical install. Most Jacksonville generator contractors coordinate between separate licensees or hold both licenses. Permitting through Duval County or Jacksonville municipal codes is required for the fuel line and electrical transfer-switch.

[JEA](https://www.jea.com/) requires specific permit and inspection for residential generator installs. The transfer switch (the device that disconnects from JEA mains and connects the home to the generator during outages) must meet utility requirements. Automatic transfer switches (ATS) are standard for unattended hurricane operation; manual transfer switches require homeowner intervention to switch over and are rarely the right choice for hurricane resilience.

The interconnect process: contractor pulls JEA permit, JEA reviews the proposed install (transfer-switch model, generator model, electrical connection details), JEA inspects post-install before commissioning. The transfer switch must include a "make-before-break" or proper utility-side disconnect to prevent backfeed onto JEA lines during line work — a safety requirement for line crews working on the system during outages.

What the contractor should provide: JEA permit number, transfer-switch model documentation (verify it's on JEA's approved list), commissioning report after install (generator load test results, ATS function test, JEA inspection sign-off), and post-install operating manual coordination with the homeowner (how to test the system monthly, what the maintenance schedule is).