Outages in Augusta County are usually short and occasionally are not. Ice storms, summer thunderstorms, and wind events take lines down across Staunton, Waynesboro, and Fishersville most years, and homes on well water discover something that town-water homes do not: no power means no water either. Not for drinking, not for flushing.
That is usually what moves a standby generator from a nice idea to a decision. The next question is how big, and it is worth understanding before anyone quotes you, because the size sets the price more than any other factor.
Essentials, Middle Ground, or Whole Home
| Coverage level | Typically runs | Does not run | Suits |
|---|---|---|---|
| Essentials | Heating controls, well pump, refrigerator, some lights and outlets, internet | Central air, electric range, electric water heater | Short outages; keeping the house safe and habitable |
| Essentials plus | The above, plus selected larger circuits such as the water heater or one HVAC system | Simultaneous heavy loads | Most Valley homes |
| Whole home | Everything, including central air conditioning | Nothing, by design | Longer outages; working from home; medical equipment |
Most homeowners assume they need the top row and discover during the assessment that the middle one covers everything they actually cared about. That is the conversation worth having before you buy.
The Loads That Actually Drive the Size
Lights and outlets barely register. The size is set by a short list of heavy consumers, and if you know which of these you have, you already know roughly where you will land.
- Central heating and cooling. Usually the single largest load, and the one that most often decides between the middle and top rows.
- The well pump. Modest while running, but it draws a substantial surge at startup, and that surge has to be available.
- An electric range or oven. Large, though you can choose to cook differently for a day.
- An electric water heater. Large and, unlike the range, one people are unwilling to go without for long.
- An EV charger. Very large. Almost always excluded from generator coverage, and load management can hold it off automatically.
- A sump pump. Small draw, but if you have one, losing it during the storm that caused the outage defeats the purpose.
That surge point on motors is the one homeowners underestimate. A well pump, a submersible pump, or an air conditioner compressor draws several times its running load for the moment it starts. A generator sized only for running loads will stall when the pump kicks in, which is precisely when you need it.
Undersizing and Oversizing Both Cost You
There is a temptation to buy the largest unit available on the theory that more is safer. It is not that simple in either direction.
Undersized is the obvious failure. The generator runs, then something large starts, and it trips or stalls. You discover this during an ice storm rather than during the sales conversation.
Oversized is the quieter waste. You pay more up front for capacity you never use, the unit occupies more space, and it consumes fuel to produce power nothing is drawing. On propane, that difference across a multi-day outage is real, and it is the kind of thing nobody mentions until you are refilling the tank.
The right answer is the one that matches your actual loads with sensible headroom for motor startup, which is what the assessment establishes.
The Transfer Switch, and Why It Is Not Optional
A standby generator ties into your electrical system through a transfer switch, which disconnects the house from the utility before connecting it to the generator.
This is a safety device rather than a convenience. Without proper isolation, a running generator can push power back onto the utility lines, which is genuinely dangerous for the crews working to restore service. It is why this work is permitted and inspected, and it is why a standby generator is not a homeowner installation.
The switch also determines what actually gets backed up. A whole-house switch covers everything downstream of it. A subpanel arrangement backs up a selected set of circuits, which is frequently the more economical route and is how most essentials and essentials-plus installations are built. Which one suits you interacts with your existing panel capacity, so the two get assessed together.
Automatic Operation and What Ownership Involves
A standby generator starts on its own within seconds of an outage and shuts down when utility power returns. You do not need to be home, and you do not need to do anything. That is the entire difference between a standby unit and a portable one you drag out of the garage in the rain and refuel by hand at three in the morning.
Two things worth knowing before you own one. It will exercise itself on a schedule, running briefly every week or two to keep the engine healthy, and you will hear it. Neighbors sometimes have opinions, so placement is worth thinking about.
And it is an engine, so it needs servicing on a schedule like any other. A generator that has not been maintained is a generator that may not start on the day it matters, which is the failure mode that stings most given what one costs.
Standby or Portable?
Before sizing anything, it is worth being honest about whether you need a standby unit at all, because for some households a portable generator is a reasonable answer and costs a fraction as much.
A portable makes sense if outages at your address are rare and brief, you are usually home when they happen, you are physically able to move and refuel it, and you can live with running a few appliances on extension cords. It has to be run outdoors, well away from the house and never in a garage even with the door open, because the exhaust is the real hazard rather than the fuel.
A standby unit earns its cost when you are on a well, when someone in the house depends on powered medical equipment, when you work from home and an outage costs you a day, when outages at your address regularly run past a few hours, or simply when nobody is going to be around to wrestle a portable into place at two in the morning in an ice storm.
Fuel and Placement
Standby generators typically run on natural gas or propane, and which is available at your property is often the first thing that narrows the options. Natural gas draws from the utility supply continuously. Propane comes from a tank, so tank size determines how long you can run, and it is worth sizing that against a realistic worst case rather than a typical one.
Placement is governed by clearance requirements from windows, doors, and vents, because the unit produces exhaust. There is usually a sensible spot on any property, but it constrains where the gas supply and the electrical run have to reach, and that affects installation cost. It is one of the reasons a site visit gives you a real number where a phone call gives you a range. Distance from the panel and from the gas supply are usually the two variables that move installation cost most, and neither is something anyone can estimate without standing at the property.
On a well? Prioritize the well pump. Homes on well water lose running water the moment the power goes out, and that single circuit is usually the difference between an outage being an inconvenience and being a real problem. See our generator installation page.