What Size Backup Generator a Los Angeles Home Actually Needs

Written by the team at Saiyan Electric and reviewed by Michael Velasquez, Founder, Saiyan Electric, Downey, CA. Last updated August 2026.

Almost every generator sizing guide online starts in the wrong place. It asks how many square feet your house is, gives you a chart, and sends you off to buy a 22 kW unit.

Square footage does not draw current. Appliances do. Two houses on the same street in Downey, both 1,800 square feet, can need generators that differ by 10 kW because one has a heat pump, an induction range and a Level 2 EV charger, and the other has a gas furnace, a gas range and a 15 year old air conditioner.

This guide walks through how a licensed electrician actually sizes a backup generator for a Los Angeles home: the three numbers that decide it, the free usage data your utility already has on you, the appliances that quietly blow the budget, and the local code and permitting rules that national buying guides never mention because they were written for Ohio.

The short answer, before the long one

Most Los Angeles homes that want meaningful backup power land somewhere between 11 kW and 26 kW. Here is roughly where the common LA housing types fall, assuming natural gas heating, cooking and water heating, which still describes the majority of homes in LA County.

Treat that table as a starting bracket, not an answer. The rest of this guide is how you narrow a 15 kW spread down to one number, because buying 8 kW more generator than you need is thousands of dollars you will never get back, and buying 5 kW too little means the unit trips out on the first 95 degree afternoon it is asked to do its job.

Why Los Angeles homes lose power, and why the answer changes your size

Sizing follows outage behavior. A region where the power flickers for 20 minutes needs a very different machine from a region where it goes out for three days. Los Angeles has the second kind of outage, and it has them for reasons that are specific to Southern California.

Public Safety Power Shutoffs during Santa Ana wind season

Southern California Edison, which serves most of LA County including Downey, Norwalk, Whittier, Cerritos and Bellflower, proactively de-energizes circuits during dangerous fire weather. These are Public Safety Power Shutoffs, and SCE has told customers to expect them to be more frequent and longer than in past years. A PSPS event is not a five minute blip. It is a planned outage that can run 24 to 72 hours while crews inspect and re-energize lines after the wind drops.

That matters for sizing in a way most guides miss. A three day outage means your generator runs continuously, in September, in Southern California, which means it runs while your air conditioning runs. If you size for a short winter outage and skip the AC circuits, you have built a machine that fails you exactly when you use it.

Heat waves and grid strain

The other major LA outage driver is heat. When a regional heat event pushes demand toward the limits of the grid, the state issues Flex Alerts asking for conservation, and local distribution equipment starts failing under sustained load. Transformers that carry a neighborhood fine in March give up during a 105 degree week in Woodland Hills or the San Gabriel Valley.

Heat driven outages happen at the moment AC demand peaks. Again, this pushes air conditioning from “nice to have” into the core of the sizing calculation.

Wildfire, storm and equipment damage

Fire damage to distribution infrastructure, wind damage, and the ordinary failure of aging equipment produce the unplanned outages. The January 2025 Palisades and Eaton fires left large parts of the county without service for extended periods, and both utilities have been under sustained regulatory pressure over reliability and shutoff practice since.

Two utilities, two different patterns

Los Angeles is split between two very different power providers, and homeowners often do not know which one they are on until they check a bill.

• LADWP serves the City of Los Angeles proper. It is a municipal utility, it does not run a PSPS program the way the investor owned utilities do, and its outages skew toward equipment failure and heat related distribution faults.
• Southern California Edison serves most of the rest of LA County, including Downey and the southeast cities. SCE does run PSPS, and homes in or near high fire risk districts see planned shutoffs on top of unplanned ones.

Which utility you are on changes how often you should expect to run, which changes fuel planning and maintenance intervals more than it changes raw kW. But it also determines where you get the single most useful piece of sizing data available to you, which is the next section.

The three numbers that decide your generator size

Everything else in this guide is detail hanging off these three.

Running watts

The steady draw of everything you want powered at the same time. A refrigerator running is about 150 to 800 watts. A 3 ton central air conditioner running is about 3,000 to 3,600 watts. LED lighting for a whole house is a few hundred watts. Running watts is the number the appliance labels give you, and it is the number every online sizing chart adds up.

Adding up running watts alone will undersize your generator. It is necessary and it is not sufficient.

Starting watts, and why air conditioning breaks the math

Anything with a motor draws a large surge at the instant it starts. For a compressor, that inrush is called locked rotor amperage, and it can be two to three times the running draw for a fraction of a second.

The practical consequence in Los Angeles: a 3 ton central AC that runs at 3,500 watts can demand somewhere in the range of 9,000 to 12,000 watts momentarily as the compressor kicks in. A 4 ton system can spike higher still. If the generator cannot deliver that surge while it is already carrying your refrigerator, lights, router and TV, the voltage sags, the generator faults, and you are standing in the dark holding a manual.

This single factor is why so many LA generator installations end up larger than the homeowner expected, and why so many DIY sizing calculators produce a number that fails in the field.

Your panel’s real measured peak demand

The third number is the one nobody talks about and the one professionals actually trust. It is not an estimate. It is your home’s real maximum demand, measured.

You almost certainly have never drawn every appliance at once. Your theoretical connected load might be 200 amps. Your actual measured peak on the hottest day of last year might be 62 amps. Sizing to the theoretical number buys a machine for a house you do not live in.

How to size your generator the way an electrician does

Five steps. The first two you can do yourself this afternoon, for free.

Step 1: pull your own usage data from SCE or LADWP

Your smart meter has been recording your consumption in intervals for years, and you are entitled to download it.

For SCE customers, sign in to My Account, open Data Sharing & Download, and choose Green Button Download My Data. You can pull up to 36 months of your own interval and billing data free of charge, in 15 or 60 minute intervals depending on your meter and account type.

For LADWP customers, interval and usage history is available through the LADWP customer account portal, under Analyze My Usage. If your account only exposes monthly billing history, ask LADWP for interval data directly, or have your electrician log a recording meter on your service for a week instead.

What you are looking for is the single highest interval in the last 12 months. That is almost always a summer afternoon. Multiply that kW figure by 1.25 and you have a defensible, evidence based starting point that no wattage worksheet can match.

Step 2: apply the professional load method

The National Electrical Code, adopted in California as the California Electrical Code, allows an existing home’s load to be determined from actual recorded maximum demand rather than a theoretical appliance tally. The method uses the highest demand recorded over the previous year, or a 30 day recording if a year of data is not available, plus a safety factor.

That is the same principle as Step 1, and it is why an electrician who asks to see a year of your bills is doing the job properly, and one who quotes a generator size off your square footage over the phone is not.

Step 3: choose your coverage model

There are three honest ways to build a backup system, and the size follows from which one you pick.

Whole home, unmanaged. The generator is large enough that everything in the house can run at once with no restrictions. Simplest to live with, most expensive to buy, usually 26 kW and up for an LA home with central air, more if the home is all electric.

Whole home with load management. The generator serves the entire panel, but a smart management module sheds or staggers the largest loads so they never stack. Your AC and your dryer take turns instead of colliding. This is the sweet spot for most Los Angeles homes and typically saves one or two full size steps of generator, which is thousands of dollars.

Essential circuits only. A subpanel is built holding the circuits you genuinely need, and the rest of the house stays dark. Cheapest by a wide margin. The honest version of this in LA has to include at least one cooling circuit, even if that is a single mini split or a window unit in one room, because a September PSPS event with no cooling in a 100 degree week is not a system anyone is happy with.

Step 4: add starting headroom

Take your largest motor load, usually the air conditioning compressor, and confirm the generator can carry its starting surge while already serving your baseline running load. Manufacturers publish motor starting capability separately from continuous output for exactly this reason.

If the surge is what is forcing you up a size, read the soft starter section below before you buy the bigger unit.

Step 5: derate for natural gas

Home standby generators produce less output on natural gas than on propane, typically around 8 to 12 percent less, because natural gas carries less energy per unit volume. Manufacturers publish both ratings, and they are not the same number.

A Generac Guardian 24 kW, for example, is rated 24 kW on liquid propane and 21 kW on natural gas. If your installer quotes you “24 kW” and you are connecting to SoCalGas, the number you are actually buying is 21 kW. Confirm which rating you are being sold. This one catches people constantly.

A Los Angeles load profile, appliance by appliance

Use this to sanity check the number your meter data gave you. Figures are typical ranges. Your nameplate always wins over any table on the internet, including this one.

What the national guides get wrong about LA

Read three generator sizing articles from national publishers and you will find sump pumps, well pumps, electric furnaces and space heaters treated as core loads.

Los Angeles homes overwhelmingly do not have basements, so sump pumps are close to irrelevant. Almost nobody in the LA basin is on a private well. Electric resistance heating is uncommon because gas heat has been standard here for generations, and heating demand is modest in a climate where winter lows rarely justify it.

Meanwhile the loads that dominate an LA sizing calculation, central air conditioning under a sustained heat event, pool equipment, and Level 2 EV charging in the region with the highest EV adoption in the country, are the ones those articles treat as afterthoughts. If you size an LA home off a Midwest template, you will buy the wrong machine.

A worked example: one Downey house, from appliance list to kW

Everything above is method. This is the method run end to end on a single real-world house, so you can follow the arithmetic and then repeat it with your own numbers.

The house. 1,950 square feet, built 1958, Downey. Gas furnace, gas water heater, gas range, gas dryer. One 3 ton central air conditioner. Single speed pool pump. Two refrigerators, the second one an older unit in the garage. LED lighting throughout, the usual network and TV load, one garage door opener. Service is 200 amps, upgraded in 2019. No EV charger.

Step A: add up the running watts that genuinely run together

This is a September PSPS event, so the air conditioning is running and the furnace blower is not. The garage door opener is intermittent and is not counted as a continuous load.

Step B: cross check it against the meter

This homeowner pulled 12 months of interval data from SCE. The highest single 15 minute interval in the previous year was 9.4 kW, on an afternoon in late August. The appliance tally said 9.0 kW. Two independent methods landing within half a kilowatt of each other is what a defensible number looks like, and it is why Step 1 of this guide is worth the twenty minutes it takes.

Step C: find the starting surge

Running watts is not what faults a generator. The compressor is.

Strip the air conditioner out of the subtotal and the rest of the house is drawing 5,500 watts. The 3 ton compressor then demands roughly 10,500 watts for a fraction of a second as it starts.

• Baseline running load without the compressor: 5,500 W
• Compressor starting surge: 10,500 W
• Instantaneous peak the generator must absorb: 16,000 W, or 16.0 kW

There is a worse case, and it is the one that catches people. If the pool pump happens to start at the same instant as the compressor, its own surge of roughly 4,500 watts stacks on top, and the momentary demand goes to about 18.7 kW. Nothing about the house changed. Only the timing did.

Step D: add headroom

Take the running subtotal and apply the 1.25 factor from Step 1: 9.0 kW multiplied by 1.25 gives 11.3 kW of continuous capacity the generator has to hold all day, in the heat, for three days straight. The meter based figure agrees, at 9.4 kW multiplied by 1.25, or 11.8 kW.

Step E: derate for natural gas, then pick the unit

This house is on SoCalGas, so the propane nameplate is not the number being bought. At the 8 to 12 percent derate discussed above, an 18 kW unit delivers roughly 16 kW on natural gas, and a 22 kW unit delivers roughly 20 kW.

The recommendation for this house: an 18 kW unit with a load management module and a soft starter on the condenser. The continuous requirement of 11.3 kW sits well inside the 16 kW natural gas rating. The load management module keeps the pool pump and the compressor from starting into the same instant, which removes the 18.7 kW collision entirely. The soft starter cuts the compressor inrush, which brings the 16.0 kW momentary peak down to a figure the unit absorbs without straining.

Without those two devices, the same house needs a 22 kW unit, at roughly 20 kW on natural gas, to cover the unmanaged 18.7 kW worst case. That is one full size step of generator, and the module and the soft starter together cost a fraction of it.

One caveat worth stating plainly: motor starting capability is published by the manufacturer separately from continuous output, and the figures differ by model. The 16.0 kW peak above is the number to have your installer confirm against the specific unit being quoted, not a number to assume.

Sizing by Los Angeles home type

The postwar home on a 100 amp panel

Downey, Norwalk, Bellflower, South Gate and much of southeast LA County are full of 1,100 to 1,600 square foot homes built in the 1940s through 1960s. Gas furnace, gas water heater, gas range, one or two AC units, original 100 amp service or smaller, sometimes still a fuse box.

Realistic target: 10 kW to 14 kW, or a well designed essential circuits system at 7 kW to 10 kW.

The catch on this house is almost never the generator. It is the panel, which is covered below.

The mid century home with central air and a pool

1,800 to 2,500 square feet, one central AC system, pool pump, two refrigerators, gas appliances. This is the most common LA generator customer.

Realistic target: 18 kW to 22 kW with a load management module, which lets the AC and the pool equipment take turns instead of stacking. Without load management, the same house often gets pushed to 26 kW for no functional benefit.

The larger or partly electrified home with EV charging

3,000 square feet or more, two AC zones, induction range or heat pump water heater, one or two Level 2 chargers.

Realistic target: 26 kW and up, and this is where liquid cooled units in the 30 kW to 48 kW range start to make sense.

The decision that saves the most money here is EV charging. A 40 amp Level 2 charger draws 9,600 watts continuously, which is most of a small generator all by itself. Most homeowners choose to exclude EV charging from backup entirely, or to install a charger that can be throttled to a low amperage while on generator power. Backing up full speed EV charging is a very expensive convenience.

The property with an ADU or a second unit

LA’s ADU boom means a lot of properties now carry two kitchens, two water heaters and sometimes two AC systems on one service. Whether the ADU is on its own meter changes both the sizing and the transfer switch design significantly. This one genuinely needs a site visit before anyone quotes a number.

What each generator size actually covers

Home type gets you a bracket. This gets you a unit. The five sizes below are the air cooled home standby units that make up the overwhelming majority of Los Angeles residential installations. Every kW figure here is the natural gas output, because that is what nearly every LA home is actually buying, and it runs 8 to 12 percent below the propane nameplate the brochure leads with.

10 kW

The essential circuits machine. It is not a whole home generator and it is not sold as one.

Realistically covers: two refrigerators, whole house LED lighting, the network and a TV, several general purpose outlets, the gas furnace blower, a garage door opener, medical equipment, and one cooling zone in the form of a mini split head or a window unit. That is a family living normally in one or two rooms through a multi day outage, for a fraction of the cost of whole home backup.

Where it fails: central air conditioning of any size. A 3 ton compressor surge alone is larger than this unit’s entire output.

14 kW

The right answer for the small postwar home that wants real coverage rather than a survival kit. Common on the 1,100 to 1,600 square foot houses across Downey, Norwalk, South Gate and Bellflower.

Realistically covers: everything in the 10 kW list, plus a 2 ton or small 3 ton central air conditioner, provided a soft starter is fitted to the condenser and a load management module keeps the dryer and the range off the generator while the compressor runs. Without the soft starter, treat 14 kW as an essential circuits unit with a mini split attached.

Where it fails: a pool pump and central air on the same house, or a second refrigerator plus an electric dryer stacked on top of cooling.

18 kW

The most commonly under-considered size in Los Angeles, and frequently the correct one. This is the unit from the worked example above.

Realistically covers: a 1,800 to 2,400 square foot home with one 3 ton central AC, a pool pump, two refrigerators and gas appliances throughout, with a load management module doing its job. Continuous demand on that house runs around 11 kW against a 16 kW natural gas rating, which leaves genuine margin for a hot September rather than a theoretical one.

Where it fails: the same house with no load management, where a pool pump and a compressor starting together push momentary demand past what the unit will hold.

22 kW

The default whole home unit in LA County, and the size most homeowners are quoted first. Often correct, and often one size more than the house needed.

Realistically covers: a 2,400 to 3,000 square foot home with a single 4 ton central AC, a pool, an electric dryer and gas cooking, running unmanaged. It absorbs a 4 ton compressor surge of roughly 15,000 watts on top of a normal baseline, which is the specific thing that makes it the safe default.

Where it fails: two air conditioning systems, an induction range, or any attempt to charge an EV at full speed while on generator power.

26 kW

The top of the air cooled range, and the point where the price of the machine starts to be worth arguing about.

Realistically covers: two AC zones running together, or one AC zone alongside an induction range or a heat pump water heater, or a household that wants EV charging available at a throttled amperage during an outage. This is also the honest answer for a 2,500 to 3,500 square foot home with a pool that does not want a load management module in the design.

Where it fails: a fully electrified home, two AC systems plus unrestricted EV charging, or an ADU carrying its own kitchen and cooling on the same service. Above 26 kW you are into liquid cooled units in the 30 kW to 48 kW range, which are a different class of installation with their own pad, clearance and sometimes air district considerations.

If you want that shortlist narrowed to one unit for your specific panel and loads, our generator installation service starts with the load calculation, not with a catalog.

Your panel usually decides the answer before the generator does

Here is the part that surprises people. On a large share of Los Angeles homes, the electrical service, not the generator, is the constraint.

A whole home automatic transfer switch has to be rated for your service. If your home is on 100 amp service and you want whole home backup, the transfer switch and the service both have to be addressed. Many older LA homes also still carry panels that are widely considered hazard prone and are routinely flagged by insurers, including Federal Pacific Stab-Lok, Zinsco, Challenger and Pushmatic equipment, along with original fuse boxes. No responsible electrician is going to bolt a new backup power system onto one of those and walk away.

The practical sequence for a lot of LA homes is:

1. Upgrade the service and panel to 200 amps, permitted and inspected to current code
2. Install the generator and automatic transfer switch sized to the new service
3. Add load management if it lets you drop a generator size

That order matters, because doing the panel first often reveals that a smaller generator will do the job, and the panel upgrade was going to be necessary regardless. If you are unsure what you have, our guides on warning signs your electrical panel is overloaded and when a panel upgrade is required will tell you quickly, and our 200 amp panel upgrade and Los Angeles panel upgrade pages cover what that work involves.

Three ways to buy a smaller generator without giving anything up

Every kW you do not buy is money in your pocket, and there are three legitimate ways to shrink the number without shrinking what your house can do.

Smart load management

A load management module watches total demand and sheds or delays the largest loads so they never run simultaneously. Your air conditioning does not need to run at the same instant as your dryer. Under the 2023 National Electrical Code, which California adopted as the 2025 California Electrical Code effective January 1, 2026, load management systems are explicitly recognized for optional standby systems, which is what a home generator is.

In practice this is usually the difference between a 22 kW unit and a 26 kW unit on a typical LA home, and it costs a fraction of that step.

A soft starter on the AC compressor

If your sizing is being driven entirely by the compressor inrush, a soft starter fitted to the AC condenser reduces starting current substantially. It is a small device, it is far cheaper than a generator size step, and on a lot of LA homes it is the single highest leverage decision in the whole project.

An honest essential circuits design

Not every home needs whole home backup. A carefully designed essential circuits subpanel covering refrigeration, lighting, the network, medical equipment, a few outlets and one cooling zone will carry a family comfortably through a multi day PSPS event at a fraction of the cost.

The word doing the work in that sentence is “carefully.” A cheap essential circuits install that forgets cooling, or that puts the wrong refrigerator on the wrong side of the transfer switch, is worse than not having one.

Fuel choice in Los Angeles

Natural gas

The default across most of LA County, because SoCalGas service is already at the house. No tank, no refueling, no run time limit as long as the gas stays on. Two things to check.

First, the derate discussed above. Second, and this one gets missed regularly: your existing gas meter may not have the capacity to feed a large generator on top of your furnace, water heater, range and dryer. Adding a 22 kW generator to a house with a standard residential meter can require SoCalGas to upsize the meter and sometimes the service line. That is a lead time item, not a same day item, and it belongs in the plan before you buy equipment.

Propane

The option when gas is not available or the meter cannot be upsized economically. Higher output from the same machine, and a finite supply. A 500 gallon tank running a mid size standby unit at moderate load gives you multiple days, which comfortably covers a PSPS event. It also needs somewhere to sit, and tank placement has its own setback rules.

Battery storage, with or without solar

Worth a genuine look in Los Angeles, because rooftop solar penetration here is among the highest in the country and California’s Title 24 requirements have put panels on most new construction.

Batteries are silent, need no permits from an air district, produce no exhaust, need no fuel deliveries, and recharge from your array every morning. What they do less well is carry a 4 ton air conditioner through three consecutive 100 degree days, which is precisely the LA scenario. Battery capacity is finite and solar output on a smoky September day after a wind event is not what the brochure assumed.

The honest summary: batteries are excellent for short outages, load shifting and quiet overnight coverage. Standby generators are better for multi day outages with heavy cooling loads. Some LA homes end up with both, and that combination is genuinely the strongest option if the budget supports it.

Permits, code and the LA specific rules

This is the section national buying guides skip entirely, and it is where installations go wrong.

The code you are being built to

California is on the 2025 California Electrical Code (Title 24, Part 3), which is based on the 2023 National Electrical Code and took effect January 1, 2026. It governs the transfer switch, grounding and bonding, conductor sizing, overcurrent protection and the load management provisions mentioned above. If a bid you are reading references an older code cycle, ask why.

Permits and inspection

Generator installations in Los Angeles require an electrical permit, and installations involving gas piping require a plumbing or mechanical permit as well. Within the City of Los Angeles that runs through LADBS. In the county’s independent cities, including Downey, it runs through the local building department. Expect an inspection, and expect the inspector to look at clearances, grounding, the transfer switch and the fuel connection.

Permits are not bureaucratic friction. An unpermitted generator install is a problem at resale, a problem with your homeowners insurance after a claim, and in many cases a manufacturer warranty issue.

Clearances, exhaust and carbon monoxide

Modern sound attenuated home standby enclosures are typically listed for installation as close as 18 inches from a structure, with larger separations required from operable windows, doors and vents so exhaust cannot enter the house. Manufacturer listing and the applicable fire code determine the actual numbers for your unit.

Carbon monoxide deserves its own sentence. Portable generators kill people in Southern California every outage season, and the cause is almost always running one in a garage, a carport or too close to an open window. A portable generator belongs outdoors, at least 20 feet from the house with the exhaust pointed away from it, per the Consumer Product Safety Commission. Never under a covered patio, and never backfed into a wall outlet. A permanently installed standby unit with a proper transfer switch removes that entire category of risk, which is a large part of why they exist.

Noise and the weekly exercise cycle

Air cooled home standby generators typically run in the 60 to 70 dBA range measured at about 23 feet. Cities across LA County set residential noise limits and quiet hours that vary by zone, and your generator will run a self test cycle every week whether there is an outage or not. That exercise cycle can usually be scheduled, and scheduling it thoughtfully is the difference between a neighbor who does not notice and a neighbor who files a complaint. Check your city’s ordinance during design, not after the concrete pad is poured.

Air district rules

Los Angeles sits inside the South Coast Air Quality Management District, which regulates emissions from stationary engines. SCAQMD Rule 1110.2 applies to stationary and portable engines rated above 50 brake horsepower, a threshold that typical residential air cooled home standby units fall below. Larger liquid cooled residential units and commercial installations can cross it and trigger air district permitting and annual run hour limits. If your project is heading toward the upper end of the size range, this needs checking rather than assuming.

What generator installation costs in Los Angeles

Cost tracks size, panel condition, fuel routing and site access more than it tracks brand. These are the ranges we quote in the Downey and greater LA area.

Larger liquid cooled systems, long gas line runs, difficult site access, and SoCalGas meter upsizing all sit above these ranges. Annual maintenance is a real ongoing cost, not an optional one. A standby generator that has not been serviced is a very expensive decoration.

Every number above is a range because an honest quote requires seeing the panel, the meter, the proposed location and the gas service. Anyone who gives you a firm price over the phone without that has not looked at your house.

Five sizing mistakes we see most often

1. Sizing off square footage. Covered at the top, and it remains the most common error. Load draws current. Floor area does not.

2. Ignoring compressor inrush. The system runs fine on a mild evening and faults the first time the AC cycles on during a real outage in August.

3. Buying the propane rating and connecting natural gas. An 8 to 12 percent shortfall against what you thought you bought, discovered at the worst possible moment.

4. Skipping the panel assessment. A new generator on 60 year old service equipment, or on a Federal Pacific or Zinsco panel, is a project that has to be redone properly later.

5. Oversizing “to be safe.” A generator running at a small fraction of its capacity for long periods is inefficient, costs more to buy and to fuel, and on diesel units can cause wet stacking. Correct sizing is not the cheap option, it is the right one.

Frequently asked questions

What size generator do I need to run a whole house in Los Angeles?

Most LA homes with one central air conditioning system and gas appliances need 18 kW to 22 kW for whole home coverage with load management, or 22 kW to 26 kW without it. Larger homes, homes with two AC systems, and all electric homes commonly need 26 kW and up. The reliable way to narrow the range is to download a year of your utility interval data and size to your measured peak.

Will a 22 kW generator run my central air conditioner?

Usually yes for a single 3 or 4 ton system, provided the generator can absorb the compressor starting surge on top of your baseline load. A soft starter on the condenser makes this comfortable and sometimes lets you drop a generator size. Two AC systems running together generally needs more than 22 kW or a load management module.

Do I need a permit for a generator in Los Angeles?

Yes. Generator installations require an electrical permit, and gas connections require a plumbing or mechanical permit as well. Within the City of Los Angeles this goes through LADBS, and in independent cities like Downey through the local building department. Work is inspected. A licensed contractor pulls these permits as part of the job.

Can I install a home standby generator myself?

No. The transfer switch connects to your service equipment, the fuel connection is regulated, and the work requires permits and inspection. Beyond the legal issue, an improper connection can backfeed the utility line and endanger line workers, and most manufacturers void the warranty on uncertified installations.

How long can a standby generator run during a PSPS outage?

A natural gas unit can run continuously as long as gas service holds, which is why it is the default choice in LA County. Propane runtime depends on tank size and load, and a 500 gallon tank typically covers several days at moderate load. All units need an oil change interval, so a very long outage means servicing the machine mid event.

Is a battery better than a generator in Southern California?

It depends on your outage profile. Batteries are quiet, clean and excellent for short outages and overnight coverage, and they pair naturally with the rooftop solar many LA homes already have. A standby generator is stronger for multi day PSPS events with heavy air conditioning demand. Homes that need both cooling and long duration coverage often end up with both systems.

How much does generator installation cost in Los Angeles?

Whole home standby installations in our service area typically run $5,000 to $12,000, with transfer switches at $800 to $2,000 and any required panel or circuit upgrades at $1,000 to $3,000. Larger liquid cooled systems, long fuel runs and gas meter upsizing push above those ranges. A site assessment is what turns a range into a real number.

Does my electrical panel need to be upgraded before installing a generator?

Often, yes, particularly in the older housing stock across Downey, Norwalk, South Gate and Bellflower. Whole home backup requires a transfer switch rated for your service, and many LA homes are still on 100 amp service or on panels that insurers flag. Assessing the panel first sometimes reveals that a smaller generator will do the job.

Get the number confirmed before you buy the machine

Generator sizing is one of the few home decisions where the difference between a good answer and a guess is worth thousands of dollars in either direction. Too small and it fails during the outage it was bought for. Too large and you paid for capacity that will never be used and will cost you more to maintain for the next 20 years.

The path to a real number is short: pull a year of interval data from SCE or LADWP, identify your measured peak, look honestly at your air conditioning, pool equipment and EV charging, and have someone assess your panel and your gas meter before anyone quotes equipment.

Saiyan Electric is a licensed C-10 electrical contractor based in Downey, serving homes across Los Angeles County since 2022. Our generator assessments include a load calculation, a panel and service review, fuel and meter capacity checks, and permitting handled from application through final inspection. We install standby and portable systems on natural gas and propane, permitted and inspected to current code.

If you want a straight answer on what your home actually needs, call (310) 780-0191 or book a free generator assessment through our generator installation service. We will look at the panel, the loads and the site, and give you a size you can defend. You can also send us the details in writing if that is easier.

Learn more about generator installation with Saiyan Electric, including what the assessment covers and how permitting is handled. If you are specifying backup power for a business, an HOA or a multi unit property, see our commercial generator installation page instead.