EG4 Battery Storage Installation in Fallbrook: Stay Powered During Fire Season

May 3, 2026
Southern California transmission power lines

EG4 Battery Storage Installation in Fallbrook:

Stay Powered During Fire Season


If you live in Fallbrook, Bonsell, Rainbow, Temecula, or the surrounding hills of North County San Diego, you already know what it feels like when SDG&E cuts the power. Red flag warnings roll in, the winds pick up, and the next thing you know your neighborhood goes dark for hours or days at a time. It happens every fire season, and for many families in this area it has become a fact of life.

It does not have to be.

Williams Mechanical Co is a certified EG4 dealer and installer serving Fallbrook, Temecula, Oceanside, and North County San Diego. We install EG4 battery storage systems that keep your home running when the grid goes down, whether that is during a PSPS shutoff, a wildfire, or a major wind event.


What Is a PSPS Shutoff and Why Does It Keep Happening in Fallbrook

PSPS stands for Public Safety Power Shutoff. SDG&E uses these shutoffs to reduce the risk of power lines sparking wildfires during high wind and low humidity conditions. Fallbrook sits in one of the most fire prone corridors in Southern California, which means our area gets hit with these shutoffs more often than most.

During a PSPS event your power can be out for anywhere from a few hours to several days. That means no refrigerator, no air conditioning during heat events, no medical equipment, no phone charging, and no lights. For families with kids, elderly parents, or anyone who depends on powered medical devices, that is more than an inconvenience.

A properly sized battery storage system changes that entirely.


The System We Install: EG4 GridBoss and FlexBoss21 with WallMount Batteries

We install the EG4 GridBoss and FlexBoss21 hybrid inverters paired with EG4 WallMount 314Ah lithium batteries. A typical installation uses two WallMount batteries giving you roughly 19 to 20 kilowatt hours of usable storage capacity.

For most Fallbrook homes that is enough to run your essential loads through a full night and into the next day without touching the grid. That covers your refrigerator, lights, phone charging, fans or a small air conditioning unit, and other critical appliances.

The GridBoss and FlexBoss21 are hybrid inverters which means they work with or without solar panels. If you already have solar on your roof the system charges your batteries during the day and draws from them at night or during an outage. If you do not have solar yet the batteries still charge from the grid during off peak hours and discharge when you need them.


Why EG4 Specifically

EG4 is one of the fastest growing names in residential battery storage and for good reason. Their systems are designed to be flexible, scalable, and compatible with both grid tied and off grid setups. The WallMount lithium batteries use lithium iron phosphate chemistry which is safer and longer lasting than older lithium ion designs.

Williams Mechanical Co is a certified EG4 dealer. That means we have completed EG4 training, we have a direct relationship with the company, and we can source parts and support through official channels. When you hire a certified dealer you are not getting a contractor who watched a YouTube video and figured it out. You are getting someone who knows the system inside and out.


Who Should Consider Battery Storage in Fallbrook

Battery storage makes sense for almost any Fallbrook homeowner but it is especially worth considering if any of these apply to you:

You have experienced multiple PSPS shutoffs and are tired of losing food, losing sleep, or scrambling for a hotel room.

You have a family member who depends on powered medical equipment like a CPAP machine, oxygen concentrator, or home dialysis unit.

You work from home and cannot afford to lose power for an entire workday.

You have a well pump that needs power to run. Many Fallbrook properties are on well water and a power outage means no water at all.

You already have solar panels and want to store the energy you are generating instead of sending it back to SDG&E for minimal credit under NEM 3.0.


What the Installation Process Looks Like

Every installation starts with a site assessment. We look at your electrical panel, your current energy usage, and what loads you want to back up. That tells us what size system makes sense for your home.

For most residential installs the process takes one to two days. We handle the full electrical work from panel connections to battery mounting to inverter setup. As a licensed C10 electrical contractor we pull the necessary paperwork and make sure everything is up to code.

Once the system is live you can monitor your battery levels, energy usage, and grid status through the EG4 app on your phone. When an outage hits the system switches over automatically. Most homeowners never even notice the transition.


Incentives That Can Help Offset the Cost

Battery storage is an investment but there are programs that can bring the cost down significantly for qualifying homeowners.

California's Self-Generation Incentive Program, known as SGIP, offers rebates for home battery storage systems. Fallbrook homeowners are particularly well positioned to qualify because our area sits in a high fire threat district and has a documented history of PSPS shutoffs. Households that meet the Equity Resiliency criteria, which includes customers who have experienced multiple PSPS events, can qualify for the highest rebate tiers available under the program.

Battery storage systems also currently qualify for the federal 30 percent investment tax credit, which applies to the full installed cost of the system.

SGIP funds are limited and subject to availability. When you contact us for a quote we are happy to discuss what incentive programs may apply to your situation so you can factor that into your decision.


Serving Fallbrook, Temecula, Oceanside, and North County San Diego

Williams Mechanical Co is based in Fallbrook. We know this area, we know the fire seasons, and we know what it means when the power goes out on a hot September night with the Santa Ana winds blowing. We are not a large company sending out subcontractors. When you call us you get our team and our expertise on every job.

We are a veteran owned DVBE and SDVOSB certified contractor holding active C10 electrical, C20 HVAC, C36 plumbing, and C-61/D35 pool equipment licenses. Battery storage installation falls squarely under our C10 electrical license and we carry full liability insurance on every job.

If you are ready to stop losing power every fire season give us a call at (760) 908-8896 or book online at williamsmechanicalco.com. We serve Fallbrook, Temecula, Murrieta, Oceanside, Vista, Carlsbad, Escondido, San Marcos, and surrounding communities throughout North County San Diego and Southwest Riverside County.