Sizing a Standby Generator: Whole Home or Essential Circuits

Two ways to back up a home, not one

When people think about a standby generator, they usually picture one of two things: a generator big enough to run the entire house without anyone noticing the power went out, or a smaller unit that just keeps the important stuff running until the lights come back on. Both are real options, and Burtner Electric, an authorized Generac dealer, installs, services, and repairs generators across the full range between them. The right size depends on the house and on what the owner actually wants covered, not on picking the biggest number available.

What whole home backup actually means

A whole home system is sized to carry the entire electrical load of the house at once, so when the power goes out, the transition is close to invisible. HVAC keeps running, the water heater keeps working, every outlet and every light stays live. It is the option people choose when they want to stop thinking about outages entirely, and it tends to fit larger homes or households where someone depends on medical equipment, a home office, or anything else that genuinely cannot go without power.

What essential circuits backup means

An essential circuits system is sized around a shorter list, the things a household actually needs during an outage rather than everything it has. That typically means the refrigerator, the sump pump, the furnace or heating system's blower, some lighting, and a chosen set of outlets rather than the whole panel. It is a smaller, less expensive system, and for a lot of homes it covers exactly what matters during a storm related outage without paying to back up circuits that can sit dark for a day without any real consequence.

Sizing is a load calculation, not a guess

Getting the sizing right starts the same way an EV charger install does, with a look at the home's actual electrical load, what is on the panel, and what the owner wants the generator to carry. Undersizing a generator means it cannot actually run everything it is supposed to when the power goes out, which defeats the purpose. Oversizing means paying for capacity that never gets used. Burtner Electric walks through this with the homeowner before recommending a size, rather than defaulting to one option.

Installation and what comes after

A standby generator installation involves more than setting a unit outside the house. It needs a transfer switch tied into the home's electrical panel, wiring run correctly and safely, and everything installed to code so it performs the way it is supposed to the one time it actually matters, during a real outage. After installation, a generator also needs ongoing maintenance, the same way a furnace or a car does, to make sure it starts and runs when it is called on rather than sitting untested until the power goes out.

Why the dealer matters

Being an authorized Generac dealer means Burtner Electric installs, services, and repairs these systems as a normal part of the work, not as an occasional side job. That matters for a piece of equipment that is meant to sit ready for months and then perform without hesitation. If a storm rolls through Hamilton County and the power goes out, a generator that was installed and sized correctly is the difference between an inconvenience and an actual emergency.

One more thing worth knowing before a storm hits

Hamilton County sees its share of severe weather, and Burtner Electric has been the same family owned company handling electrical work here since 1986, generators included. Being local means being available for standby generator installation, service, and repair without treating it as an occasional specialty, and it means being reachable for the ongoing maintenance a generator needs long after the initial install is done.

Getting started

A generator sizing conversation starts with a look at the home, the panel, and what the owner actually wants backed up, whole home or a shorter list of essentials. From there, Burtner Electric can put together a recommendation that fits both the house and the budget, rather than starting from a single default size and working backward.

If you are weighing whole home backup against essential circuits, or you are not sure which one fits your house, call Burtner Electric at 317-773-7663. We have been doing this kind of work across Central Indiana since 1986, and sizing it right the first time is most of the job.