Automatic Transfer Switch Installation in Rohnert Park & Sonoma County
Real sizing rules and product specifics — not just "we install transfer switches" — from a licensed local electrical contractor.
Why Sonoma County Homes & Businesses Call Bright Right First
- We size your transfer switch with the real amp-matching rule — not guesswork.
- We explain load shedding so a smaller, more affordable generator can genuinely cover your whole home.
- Licensed, insured, and available 24/7 — call (707) 791-5552 any time your project needs an electrician on-site.
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20+ years
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CSLB #1156335
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Sonoma County
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Automatic Transfer Switch Installation
Why Sonoma County Chooses Bright Right
- Local, family-owned electrical contractor based right in Rohnert Park — not a call center routing you to a subcontractor.
- Straightforward answers on switch type, sizing, and cost, explained before you sign anything.
- CSLB-licensed (#1156335) and available around the clock for anything that comes up along the way.
Automatic Transfer Switch Installation
What Is Automatic Transfer Switch Installation?
Automatic transfer switch installation covers sizing, wiring, and connecting the component that makes a standby generator truly automatic — detecting an outage, disconnecting your property from the grid, and switching to generator power in seconds. Our Generator Installation page covers the general safety mechanism behind this — this page goes deeper into the real decisions that matter: which type of switch you actually need, how it's sized, and which products fit your home.
Getting this right isn't just about picking a brand — it's about matching the switch to your service, your generator, and your actual goals. Bright Right Electric installs automatic transfer switches for homeowners across Sonoma County, as a CSLB-licensed electrical contractor (#1156335) based right in Rohnert Park.
Automatic Transfer Switch Installation
Our Process
An automatic transfer switch installation moves through the same core stages:
01
Service Assessment
We check your main panel's amperage and existing service to establish the real numbers we're designing around.
02
Switch Type Selection
We help you decide between a service-entrance rated (whole-house) switch or a smaller load-center (essential-circuits) switch.
03
Sizing
We size the switch to match your main breaker's amperage, your generator's output, and your utility service rating.
04
Installation
We wire the switch to your panel and generator, following the correct configuration for your switch type.
05
Commissioning
We test the full transfer sequence under load to confirm the handoff works correctly, automatically, every time.
06
Walkthrough
We show you how the system works, including any app-based monitoring if your switch supports it.
Automatic Transfer Switch Installation
How Much Does Automatic Transfer Switch Installation Cost?
Cost depends heavily on switch type and configuration — a smaller, essential-circuits load-center switch generally costs less than a full service-entrance rated switch sized to match a 200-amp or larger main panel.
Automatic Transfer Switch Installation
Service-Entrance vs. Non-Service-Entrance: The Real Decision
This is the first real decision to make: a service-entrance rated (SER) switch includes a built-in main disconnect breaker and installs where utility power enters your property — it's often required by code for whole-house backup, since it provides a single, code-compliant point of disconnection. A non-service-entrance rated switch installs after your main panel, typically feeding a smaller sub-panel of essential circuits — if it's used for whole-house backup instead, a separate upstream main disconnect is required to stay code-compliant.
The Real Sizing Rule
This is genuinely simple once you know it: for a service-entrance switch, match your main breaker's amperage exactly. A 200-amp main panel needs a 200-amp transfer switch. A 100-amp service needs a 100-amp switch. For a smaller, essential-circuits-only setup, the switch is instead sized to the sub-panel feeding those specific circuits.
Load Shedding: How a Smaller Generator Can Still Cover Your Home
This is worth understanding if you're trying to avoid an oversized (and overpriced) generator: load shedding lets a smaller generator serve a larger home by temporarily disconnecting non-critical circuits during peak demand. For example, a system might briefly pause your clothes dryer or water heater the moment your central air conditioning compressor starts up, then automatically reconnect them once the compressor reaches its running speed. This is a real, practical way to get genuine whole-home coverage without paying for a generator sized for every circuit running simultaneously.
Automatic Transfer Switch Installation
Whole-House vs. Load-Center Switches
Here's an honest comparison of your two real options:
| Whole-House (SER) | Load-Center (Essential Circuits) | |
|---|---|---|
| Coverage | Every circuit in your home | 8–16 selected critical circuits |
| Best for | 200A+ service, larger generators | Older 100A-service homes, smaller generators |
| Installation point | At the utility service entrance | After the main panel, feeding a sub-panel |
Neither option is universally better — the right choice depends on your generator size, your service, and how much of your home you actually want covered during an outage.
Smart Monitoring Features
Many modern transfer switches offer real app-based monitoring — WiFi connectivity, outage alerts, and remote diagnostics through the generator manufacturer's app. This lets you check your system's status and get notified of issues without being physically present.
Automatic Transfer Switch Installation
What's Included
Automatic transfer switch installation often works alongside these related services:
Generator Installation
Generator installation covers the broader project this switch is typically part of, including the real safety mechanism (backfeed prevention) behind why a transfer switch matters.
Whole House Surge Protection
Whole house surge protection covers a genuinely practical add-on while your panel is already open for a transfer switch connection — a meaningfully cheaper time to add it than a separate visit later.
Service Entrance Upgrades
Service entrance upgrades cover increasing your home's overall electrical capacity — relevant if your current service amperage doesn't match what a whole-house transfer switch and generator setup actually needs.
Panel Replacement
Panel replacement covers upgrading an outdated or undersized electrical panel, sometimes a necessary step before a transfer switch and generator can be properly sized and installed.
Portable Generator Hookup & Interlock Installation
A lower-cost, manually-operated alternative to a full automatic transfer switch, using a listed panel interlock, for homeowners who don't need a fully automatic system.
Generator Sizing & Load Calculation
Determining the right generator capacity to pair with your transfer switch, based on your real electrical load and coverage goals.
Automatic Transfer Switch Installation
Why Sonoma County Chooses Bright Right Electric
We size by the real rule, not a guess.
Matching your switch to your main breaker's amperage is simple — but it has to be done correctly, and we do it correctly every time.
We explain load shedding so you don't overpay for a bigger generator.
A smaller, more affordable generator can genuinely cover your whole home with the right load-shedding configuration — we help you find that real balance.
We know the real service-entrance vs. non-service-entrance decision.
Getting this choice right affects code compliance, cost, and what actually stays powered during an outage.
We're licensed, insured, and available 24/7.
As a CSLB-licensed contractor (#1156335), we're reachable at (707) 791-5552 any time your project needs an electrician on-site.
08 ─────── Reviews
What Rohnert Park Customers Are Saying
"This is the most professional company I have ever worked with. I am a difficult person and hard to please (I have really high standards (as a retired science teacher) and I am skeptical of workmen and I'm a perfectionist!). Bright Right is currently working on the 3rd job I have hired them for – everything has gone smoothly, no stress at all!!! They are so friendly and so courteous. Rick and Dustin are an effective team with their two unique personalities – both very upbeat, serious, and kind. They explain everything in detail and answer all my questions (I am hyper-concerned about my property), and they are basically experienced, conscientious electricians you can trust."
— Nora Parker · Google Review
"I recently hired Dustin for some electrical work at my home, and I couldn't be happier with the results. He installed a high-quality bathroom fan, finished installing several outlets around the house, and completed a new electrical panel installation. From start to finish, Dustin was professional, knowledgeable, and clearly takes pride in doing the job right. The new panel installation was the bigger job, and Dustin handled it with real expertise. Everything was organized, labeled, and done to a very high standard, which gave me a lot of confidence in the safety and quality of the work."
— Google Review
"Bright Right did the electrical for our kitchen remodel and we couldn't be happier, we have since then added an EV with them and they were as good as the first time. Highly recommend!"
— Joey Evans · Google Review
"Shout out to Dustin Fildes, the electrician they sent to do the work at my house. You can tell he takes pride in his work. He's a very professional and very friendly. Individual would absolutely recommend Bright Right Electric and specifically Dustin to all my family and friends. Thank you Bright Right"
— Robert Horner, Google Review
Google Business Profile
5.0
Across 27 Google reviews
Automatic Transfer Switch Installation
Serving Sonoma County Homes & Businesses
Bright Right Electric is based at 1150 Holly Ave in Rohnert Park, and we install accent lighting for homes and businesses throughout Sonoma County — from Rohnert Park and Santa Rosa to Petaluma and the surrounding communities along the Highway 101 corridor. Whatever feature you want highlighted, we bring the right technique to the job.
Questions
Frequently Asked Questions
What is a service-entrance rated transfer switch?
A service-entrance rated (SER) automatic transfer switch includes a built-in main disconnect breaker and installs where utility power enters the property. It's often required by code for whole-house backup, since it provides a single, code-compliant means of disconnecting from the utility grid before connecting a generator.
What size automatic transfer switch do I need?
For a service-entrance switch, match your main breaker's amperage exactly — a 200-amp main panel needs a 200-amp transfer switch, a 100-amp service needs a 100-amp switch. For an essential-circuits-only setup, the switch is sized to the sub-panel feeding those specific circuits instead.
Whole-house vs. essential-circuits transfer switch — which do I need?
It depends on your generator size and goals. A whole-house, service-entrance rated switch transfers all circuits simultaneously. A load-center or essential-circuits switch handles a smaller, defined set of critical loads and is a practical option for older 100-amp-service homes or smaller generators.
What is load shedding on a transfer switch?
Load shedding lets a smaller generator serve a larger home by temporarily disconnecting non-critical circuits during peak demand — for example, briefly pausing a clothes dryer while a central air conditioning compressor starts, then reconnecting once it's running.
Can a smaller generator power my whole house with a transfer switch?
In many cases, yes, with load shedding — a properly configured transfer switch can manage which circuits draw power at any given moment, allowing a generator that couldn't handle every circuit simultaneously to still provide effective whole-home coverage.
What transfer switch works with my generator?
Compatibility depends on your specific generator brand and model.
How much does automatic transfer switch installation cost?
Cost depends heavily on switch type and configuration — a smaller essential-circuits load-center switch generally costs less than a full service-entrance rated switch sized to match a larger main panel.
Do I need a permit to install a transfer switch?
Typically, yes — a licensed electrical contractor pulls the required permit before installation begins, since this work involves your home's main electrical service.
Can I monitor my automatic transfer switch remotely?
Many modern transfer switches offer app-based monitoring through the generator manufacturer's system, providing WiFi connectivity, outage alerts, and remote diagnostics.
What is the difference between a contactor-type and molded-case transfer switch?
A contactor-type switch uses heavy-duty relays and is the standard, cost-effective choice for residential and light commercial applications. A molded-case switch uses molded case breakers as switching elements, adding overcurrent protection, and is more common in mid-range commercial applications.
Get in touch
Ready to Talk Through Your Project?
Call (707) 791-5552 or fill out the form below and we'll follow up with real design guidance for whatever you want to highlight.
Phone
(707) 791-5552
(tap to call)
Address
1150 Holly Ave, Rohnert Park, CA 94928
Hours
7am - 5pm & 24 hour emergency services available.
15 ─────── Full service detail
Electrical Panel Upgrades in Rohnert Park
Replacing an undersized or obsolete panel is the most common job we perform in Rohnert Park, and it's the one that unlocks everything else. If your home still runs original 100-amp service, a Federal Pacific Stab-Lok, or a Zinsco panel, you're working with equipment engineered for a much smaller electrical load — and, in the case of those two brands, with a documented history of breakers that fail to trip. Upgrading to 200-amp service makes EV charging, battery backup, heat pumps, and modern appliance loads possible without constantly tripping breakers. We size the new service to what your household actually needs, pull the permit, coordinate the PG&E disconnect and reconnect, and meet the inspector for final sign-off.
EV Charger Installation in Sonoma County
Bright Right installs Level 2 home charging sized to your vehicle and, just as importantly, to your panel's actual available capacity. We run the dedicated 240-volt circuit, mount and commission the charger, and handle the permit — installing Tesla Wall Connectors, universal J1772 and NACS units, and hardwired or plug-in setups across Rohnert Park, Petaluma, and Santa Rosa. The detail most homeowners don't hear until it's too late is that many Sonoma County panels can't support a Level 2 charger without a service upgrade first, so we run a load calculation before you buy equipment, not after. We can also pre-wire a second circuit if a second EV is anywhere in your future.
Standby Generators & Backup Power
Public safety power shutoffs are a fact of life in Sonoma County, and so are winter storms that take lines down in the hills. We install whole-house standby generators with automatic transfer switches that pick up the house within seconds of an outage, wire inlets and manual transfer switches for portable generators, and add whole-house surge protection so your equipment isn't damaged when the utility comes back online. We'll also tell you honestly which tier makes sense — not every home in Cotati or Penngrove needs a whole-house unit when a critical-loads panel that keeps the refrigerator, well pump, internet, and a few circuits alive costs a fraction as much.
Solar & Battery Systems
We handle new photovoltaic installation, battery storage, system additions, and remove-and-replace work when a roof needs attention or a system has failed — plus service on existing arrays that aren't producing what they should. If you inherited a solar system with the house and nobody can tell you how it's wired or whether it's still under warranty, we can assess it and give you a clear picture. Battery storage in particular has changed the math for Sonoma County homeowners: between shifting utility rate structures under NEM 3.0 and the frequency of outages, a battery paired with existing solar is often a better investment than adding more panels.
Interior & Exterior Lighting
Recessed and can lighting, full LED retrofits, under-cabinet lighting, dimmer and smart-switch installation, fixture and chandelier hanging, landscape lighting, and security and motion-sensor lighting for homes across Rohnert Park and the University District. On the commercial side we handle lighting retrofits for offices, retail spaces, and warehouses along the Commerce Boulevard corridor, including the fixture and control changes that come with California Title 24 compliance. Lighting is one of the few electrical upgrades where the difference is immediately visible, and it's frequently the cheapest way to make a dated room feel finished.
Electrical Troubleshooting & Repair
Breakers that trip for no obvious reason, circuits that go dead, lights that flicker when the dryer starts, outlets that no longer hold a plug, GFCIs that won't reset, a faint burning smell you can't locate. These are the calls where experience shows. We trace a fault to its real source instead of swapping parts and billing for guesses, which is why our repairs hold and why we get called in behind other contractors who couldn't find the problem. In older Sonoma County homes the cause is often a failing backstab connection, a corroded neutral, a rodent-damaged run in a crawlspace, or a decades-old junction box buried behind drywall.
Custom Homes & New Construction
Full electrical for ground-up residential builds, major remodels, and additions throughout Sonoma, Marin, and Napa County — load calculations and plan review, service and meter setup, rough-in, trim, and final inspection. We work with general contractors, designers, and owner-builders, and we're comfortable on high-end custom projects near Sonoma State University where the lighting design, low-voltage layout, and smart controls all have to be coordinated before a single wire goes in. Getting the details right at rough-in is what keeps a home safe and functional for the next forty years — and it's far cheaper than fixing it after the drywall is up.
Commercial Electrical & Tenant Improvement
Service upgrades, panel and subpanel work, dedicated circuits for equipment, lighting retrofits, EV charging for employee and customer parking, and full tenant-improvement electrical for offices, retail, restaurants, and light industrial space along Redwood Drive and beyond. We understand a commercial job runs on someone else's schedule, so we work around business hours when the scope requires it. From a single dedicated circuit to a complete build-out, you get one licensed contractor coordinating permits, PG&E, and inspection — with clear pricing and a clean, code-compliant result.