Standby Generators
When the grid drops in Los Angeles, standby generators decide whether your home keeps running or goes dark until the utility restores power. A whole-house automatic standby generator senses the outage, starts itself, and carries your panel load within seconds, with no extension cords and no one home to flip a switch. However, getting that result depends on decisions made long before the unit arrives: a real load calculation, a gas supply that can feed the engine, and an electrical integration that your inspector will sign off on. This guide walks through sizing, installation, permitting, and ongoing operation from an electrician's perspective, so you can evaluate whether a standby system fits your home and what the project actually involves.
What You'll Find in This Guide
If this is the work you are planning, start with Generac Standby Generators.
Why Standby Generator Sizing Starts with a Load Calculation
Most sizing advice begins with square footage. A common question is "what is the best generator for a 4,000 square foot home," and the honest answer is that square footage alone cannot tell you. Two 4,000 square foot homes can carry wildly different electrical loads. One might run a single HVAC unit and a gas range. The other might have three air conditioning condensers, an electric cooktop, a pool system, a wine cellar, and a Level 2 EV charger. As a result, the right starting point is the same NEC load calculation an electrician performs when sizing your service panel.
That calculation adds up your connected loads, applies demand factors, and tells you what the home actually draws. From there, you can make an informed choice between two strategies. The first is full coverage, where the generator carries everything the panel carries. The second is load management, where the generator covers the whole panel but sheds low-priority circuits, like a second HVAC stage or an EV charger, when demand peaks. Generac's load-shedding modules make this practical, and it often lets a smaller unit protect a larger home without compromise on the loads that matter.
Where Modern Loads Change the Math
Electrification is pushing residential loads upward, and your generator sizing should account for where your home is headed, not just where it is today. For example, EV adoption keeps climbing in this state. According to Next10's Green Innovation Index, plug-in vehicles made up 72.7% of new light-duty vehicle registrations in a measured category in California in 2025, up from 69.4% in 2023. In practice, that means many homes we size generators for either have a Level 2 charger already or will add one within the life of the generator. A 48-amp charger is a significant continuous load, and whether you back it up, shed it, or exclude it is a decision worth making deliberately.
Beyond that, homes with 400A services, Span smart panels, or extensive automation deserve special attention. A Span panel can handle circuit-level load management natively, which changes how you approach generator sizing entirely. With this in mind, bring your electrician and your generator installer together early. When they are the same firm, the load calculation, the panel work, and the generator selection come from one set of numbers instead of three vendors' assumptions.
What Generac Installation Requirements Look Like in Practice
A whole-house standby generator is a permitted construction project, not an appliance drop-off. Understanding the scope upfront helps you plan the timeline and budget realistically. The work breaks into three parallel tracks: gas, electrical, and permitting.
The Gas Supply Side
Air-cooled Generac units in the 18kW to 26kW range run on natural gas or propane, and they are hungrier than most homeowners expect. Consequently, the first site question is whether your existing gas meter and line can deliver the required BTUs at the required pressure while the rest of the house still draws gas. Many Los Angeles homes need a meter upgrade from the gas utility or a dedicated line run from the meter to the generator pad. That said, this is a known process, not a surprise, when someone checks it during design. The utility coordination for a meter upgrade is often the single longest lead item in the whole project, so start it early.
The Electrical Integration
On the electrical side, the core component is the automatic transfer switch, which sits between the utility service and your panel. During an outage, it disconnects your home from the grid, signals the generator to start, and transfers the load. This protects utility workers from backfeed and protects your equipment from an uncontrolled reconnection. For homes with 200A or 400A services, transfer switch selection and placement require real design work, and service-rated equipment must match your existing gear. Additionally, this is the natural moment to address an aging panel. If your service needs an upgrade anyway, combining it with the generator project means one permit cycle and one round of utility coordination instead of two.
Permitting, Placement, and Timeline
Your jurisdiction will require electrical and often mechanical or plumbing permits, plus inspections. Placement rules matter too: setbacks from windows, doors, and property lines, clearances for airflow and service access, and in some areas noise considerations. For a typical project, the installation itself takes a few days on site. However, the full timeline from contract to commissioning usually runs several weeks to a few months, driven mostly by gas utility scheduling, equipment availability, and permit turnaround rather than the physical work. Before you hire anyone, verify their license through the Contractors State License Board at cslb.ca.gov, and confirm the permit will be pulled under that license, not left to you as an owner-builder.
How Standby Generators Operate, Self-Test, and Stay Ready
Owning a standby system is largely hands-off, which is the point. Still, knowing how the machine behaves day to day helps you trust it and maintain it properly.
The Automatic Sequence During an Outage
When utility power fails, the transfer switch detects the loss of voltage. After a short delay to ride out momentary flickers, it signals the generator to start. The engine spins up, stabilizes, and the switch transfers your home's load, typically within ten to thirty seconds of the outage. When the grid returns, the system watches for stable utility voltage, transfers back, and runs the engine through a cool-down before shutting off. You do nothing. For homes with Control4 or Josh AI automation, generator status can feed into the control system, so you can see run state and transfer events alongside everything else in the home.
Why a Standby Unit Beats a Portable Power Station Here
The generator versus portable power station question comes up often, and the two solve different problems. A battery power station can run a refrigerator, some lights, and electronics for hours. However, it cannot start automatically, cannot carry central air conditioning or well pumps for long, and depletes rather than generates. A standby generator runs for days on the gas line, starts itself whether you are home or traveling, and powers the whole panel. For a second home or an estate where outages must never interrupt security systems, refrigeration, or climate control for sensitive finishes and collections, automatic operation is the deciding factor, not raw capacity.
The Maintenance Schedule That Keeps It Ready
Reliability depends on routine care. The unit exercises itself weekly or biweekly, running for a few minutes to keep the engine lubricated and verify readiness, and it logs any faults. Beyond that self-test, plan on annual service: oil and filter changes, spark plugs and air filter on schedule, battery inspection, and a load test under transfer. Generac specifies service intervals by run hours as well as calendar time, so a unit that carried your home through a long outage may need service sooner. For example, extended run events of 100 hours or more typically trigger an oil change regardless of the calendar. Treat the maintenance schedule like you treat HVAC service, and the generator will be ready for the outage you did not see coming.
Ready to Get Started?
We design and install Generac whole-house standby generator systems for high-end homes across Los Angeles, handling the load calculation, electrical integration, transfer switch, permitting, and coordination with your architect, GC, and the gas utility from one C-10 licensed firm, CSLB C-10 #1048529. Because we also handle service upgrades, Span smart panels, EV charging, and whole-home automation, the generator becomes part of a coherent electrical design rather than a bolt-on. If you are planning a new build, a renovation, or an estate upgrade and want standby power engineered from your actual panel loads, call us or send a project request and we will walk through the numbers with you.