Generator FAQ

It depends on what you want running at once rather than on the square footage. A typical Riverside home with one air conditioning system and normal appliances is comfortable on 18kW to 22kW. Two air conditioning systems, a pool, a well or an EV charger usually needs 24kW to 26kW. Very large homes move to liquid-cooled units from 32kW upward. If you only want essentials, 10kW to 14kW often covers a refrigerator, internet, lighting and one cooling zone. We size from a load calculation at the panel, using the worst realistic case, which here is a 105-degree afternoon with both compressors starting together.

We install Generac, Kohler, Cummins and Champion. We service those plus Caterpillar, Briggs and Stratton, Onan, Detroit and MTU, including equipment installed by companies that no longer exist. Generac has the widest range and the best parts availability locally, Kohler tends to be quieter in several size classes, Cummins is the workhorse on commercial and large residential jobs, and Champion competes on price for essential-circuit installs. On an inherited machine the first visit is normally a full inspection and a load test.

Most complete residential installations in the Riverside area run between $5,000 and $15,000, covering the generator, the automatic transfer switch, the pad, the gas and electrical work, the permit and commissioning. Essential-circuit systems sit at the low end; large liquid-cooled machines, panel upgrades or long gas runs sit at the top or above it. The equipment is usually about half the total. We quote a fixed price after a site visit, and financing is available with terms from about 12 to 84 months subject to credit.

Industry surveys generally put it at roughly 3 to 5 percent of home value for a properly installed and permitted whole house system. It carries more weight in areas that actually lose power: the Corona canyons, north Rancho Cucamonga, the Redlands and Yucaipa foothills and the Verdemont side of San Bernardino all sit in fire-season shutoff territory, and buyers there have lived through multi-day outages themselves. The permit matters for this, since an unpermitted install is a problem during escrow rather than a feature.

A portable is movable, cheaper, started by hand and fuelled by hand, and connects with cords or through an inlet box. A standby unit is permanently installed, permanently connected to natural gas or propane, wired to an automatic transfer switch and starts itself within seconds whether or not anybody is home. It also tests itself weekly. For a short blip a portable is fine. For a multi-day fire-season shutoff, standby is the only one people are still happy with on day three. Never run a portable in a garage or near an open window.

Residential standby units in modern enclosures run around 60 to 70 decibels at the distance manufacturers quote, which is between a normal conversation and a vacuum cleaner in the next room, and typically no louder than the air conditioner sitting beside it. Larger commercial and diesel units are louder, with sound-attenuated enclosures available where it matters. Most neighbours only ever hear the weekly exercise cycle, which is why we schedule that for the middle of a weekday rather than early morning.

Yes. A permanently installed generator needs electrical and mechanical permits and an inspection, and the gas connection is inspected too. In the City of Riverside that goes through Building and Safety; each surrounding city runs its own process. Stationary diesel engines above a threshold size also need a South Coast AQMD permit to construct and to operate, with emergency standby engines limited to a set number of testing hours a year. We file all of it and hand over the signed-off paperwork.

On natural gas, as long as the outage lasts, since the fuel keeps arriving by pipe. On propane, it is a tank question: a 500-gallon tank at around half load will typically carry a home standby unit for several days. On diesel, it is a base tank question, commonly 24 to 48 hours on smaller standby units before a delivery is needed, and as long as you design for on larger commercial sets with bulk storage. We size fuel storage around the outage you are actually preparing for, which in this area means multi-day rather than multi-hour.

One professional service a year for a home unit, or every 100 to 200 running hours if it works harder than that. Commercial and industrial sets run quarterly or semi-annual inspections with an annual full service, plus annual load bank testing where insurers or code require it. A service visit covers oil and filters, air filter, plugs on gas engines, battery load test, coolant, controller check and a transfer test under load. Dead batteries cause more failures than every mechanical fault combined, and they are the cheapest part on the machine.

Yes, and for a defined project it is almost always the right answer. We rent portable units, towable diesel sets from 20kW to 200kW and larger industrial machines, by the day, the week or the month, delivered and set up. That covers construction sites without permanent power, weddings and events, warehouse fit-outs, planned utility work and covering a building while its own system is repaired. If you find yourself renting for a second fire season, ask us to price a permanent installation alongside it, because by then the arithmetic has usually changed.

Yes, with the caveat that the compressor start is what sets the size. An air conditioner draws several times its running current for the first second or two, and that surge is what the generator has to absorb. One five-ton system is comfortable on a 22kW unit; two systems starting together usually want 24kW to 26kW, or a load management module that staggers them. A soft-start kit on the condenser cuts the surge substantially and can save a whole size step on the generator, which normally pays for itself several times over.

Yes, and it is a large share of what we do. Between county and city facilities, medical buildings, industrial sites along the 215 and decades of residential installs, San Bernardino and Riverside have a lot of equipment whose original installer is long gone. We take those on, and the first visit is normally a full inspection and a load test rather than a quick look, because until a machine has carried real load nobody can honestly say what condition it is in.

It depends on what you want running at the same time, not on the size of the house. A typical 2,000 to 3,000 square foot Riverside home with one air conditioning system, a kitchen and normal appliances is comfortable on 18kW to 22kW. Two air conditioning systems, a pool, a well or an EV charger usually pushes it to 24kW to 26kW. Above that, or for very large homes, we move to liquid-cooled units from 32kW up. If you only want essentials covered, 10kW to 14kW is often enough. We do a load calculation at the panel and size to the worst realistic case, which around here is a 105-degree afternoon with both compressors starting together.

Natural gas is the default for any home with a gas main, because the supply keeps coming during an outage and there is nothing to refill. Propane is the answer where there is no main, which covers a lot of Norco, Jurupa Valley and rural Perris; it stores indefinitely, delivers slightly more output from the same engine, and needs a tank of at least 250 to 500 gallons if you want multi-day runtime without a delivery. Diesel is the standard for commercial and industrial standby and for large rural properties, because it produces the most power per dollar of engine, but it needs on-site storage, periodic fuel polishing and, for stationary engines, an air district permit.

Most complete residential installations in the Riverside area run between $5,000 and $15,000, covering the generator, the transfer switch, the pad, the gas and electrical work, the permit and commissioning. Smaller essential-circuit systems sit at the low end. Large liquid-cooled units for big homes, or jobs that need a panel upgrade or a long gas run, sit at the top or above it. The equipment alone is usually about half; the rest is the install. We quote a fixed price after a site visit rather than a range, and financing is available.

The install itself is one to two days for a typical air-cooled home standby system, with the power off for a few hours while the transfer switch goes in. The calendar is longer than the labor: allow one to three weeks for the permit and equipment, more if the unit is a special order or the gas meter needs upgrading by the utility, since that runs on their schedule. Inspection follows the install, then commissioning. Most Riverside homeowners are from first call to working generator in three to six weeks.

Yes. A permanently installed standby generator needs electrical and mechanical permits, and the gas connection is inspected too. In the City of Riverside that goes through Building and Safety, and the surrounding cities each run their own process. We file the paperwork, meet the inspector and hand you the signed-off permit at the end. Commercial and industrial engines have a second layer: stationary diesel engines above a threshold size also need a South Coast AQMD permit, which we handle on those jobs.

On a level pad outside, clear of the house by the manufacturer distance, which is usually about 18 inches from the wall and five feet from any window, door or vent, with the exhaust side pointing away from the building and clear airflow all around. It should be close enough to the gas meter and the electrical panel to keep the runs reasonable, out of any low spot where water collects, and where a service truck can reach it. On tight side yards in Corona and older Riverside neighbourhoods, placement is the constraint we design the whole install around.

Industry surveys generally put the effect at around 3 to 5 percent of home value for a properly installed whole house system, and appraisers in areas with frequent outages tend to treat it as a genuine feature rather than a personal preference. In fire-season shutoff neighbourhoods such as the Corona canyons, the Rancho Cucamonga foothills and the Redlands hills, it also shows up as a shorter time on market, because buyers there have lived through the outages themselves.

Yes. We work with lending partners who cover home standby installations with terms from about 12 to 84 months, subject to credit approval, and there are promotional zero-interest periods on some equipment brands at certain times of year. Many homeowners also use a HELOC, since the work is a permanent improvement. We will lay out what the monthly number looks like alongside the fixed quote so you can compare them properly.

One professional service a year for most residential units, or every 100 to 200 running hours if it works harder than that. That visit covers oil and filter, air filter, spark plugs, valve clearance checks at the longer intervals, battery test, coolant on liquid-cooled units, a transfer test under load and a controller check. Between visits the machine runs its own weekly exercise cycle. The single most common reason a standby generator fails to start is a dead battery, which is also the cheapest thing on it to replace.

A portable generator is a movable machine you start by hand, refuel by hand and connect either with extension cords or through an inlet box and interlock. It is cheaper to buy and much more work to use. A standby generator is permanently installed outside, permanently connected to natural gas or propane, wired to an automatic transfer switch, and it starts itself within seconds of an outage whether or not anybody is home. It also tests itself weekly. For a short blip a portable is fine. For a multi-day fire-season shutoff, standby is the only one people are still happy with on day three.

It is the device that sits between the utility and your panel. It watches the incoming supply, and when the utility fails it signals the generator to start, waits for it to stabilise, then transfers your circuits across. When utility power returns it transfers back and shuts the generator down. Critically, it also isolates your system from the grid so your generator cannot backfeed onto lines a repair crew may be touching, which is both a safety requirement and a code one. If you want automatic operation, you need one. Manual transfer switches are cheaper and require somebody to be home and awake.

Residential standby units in modern enclosures generally run around 60 to 70 decibels measured at the distance manufacturers quote, which is somewhere between a normal conversation and a vacuum cleaner in the next room. Larger commercial and diesel units are louder, and sound-attenuated enclosures are available where that matters. In practice, placement and orientation change the experience more than the rated number, and the weekly exercise cycle is the only time most neighbours would ever hear it, which is why we schedule it for the middle of a weekday.

On natural gas, as long as the outage lasts, because the fuel keeps arriving by pipe. On propane, it depends on the tank: a 500-gallon tank at around half load will typically carry a home standby unit for several days, and a 250-gallon tank for roughly half that. On diesel, it depends on the base tank, which on smaller standby units is often 24 to 48 hours before a delivery is needed, and on larger commercial units can be sized for whatever runtime the site requires. We size fuel storage to the outage you are actually preparing for.

Yes, but the compressor start is what sets the size. An air conditioner draws several times its running current for the first second or two, and that surge is the number the generator has to handle. One five-ton system is comfortable on a 22kW unit; two systems starting together usually want 24kW to 26kW or a load management module that staggers them. A soft-start kit on the condenser reduces the surge substantially and can save a whole size step on the generator, which normally more than pays for itself.

Yes, though they do not automatically cooperate. Most grid-tied solar shuts down during an outage for safety, so panels alone leave you dark. A generator can be integrated alongside solar and battery storage, with the transfer switch and the inverter configured so the systems hand over cleanly rather than fighting each other. This is common on the newer Eastvale and Rancho Cucamonga homes, and it needs designing at the start rather than bolting together afterwards.

From the connected load and its starting characteristics rather than from the utility bill. The utility bill is an average running load and hides the thing that actually matters, which is the largest step of load the set has to accept at once. Large motors, fire pumps, chillers and UPS systems all draw far more starting than running, and a set that is fine on paper can dip out of tolerance and trip when they hit it. We take the schedule of loads, work out the worst case sequence, and size for that with headroom for the growth you already know is coming.

In the South Coast basin, which covers all of our service area, stationary compression-ignition engines above a modest size need a permit to construct and then a permit to operate. Emergency standby engines are restricted to a limited number of hours a year for maintenance and testing, typically 50, and running beyond that or using the engine for non-emergency purposes such as peak shaving puts it into a different and much more demanding permit category. We prepare and file the application, supply the engine and emissions data, and set the exercise schedule so the site stays inside its hour allowance.

A load bank is a portable resistive load we connect to the generator so it can be run at its rated output without the building needing to consume the power. It proves the set can actually carry what it was sold to carry, and it burns off the unburnt fuel and carbon deposits that build up in a diesel that only ever runs lightly loaded. Monthly no-load exercising proves the engine starts, which is not the same thing. Annual load bank testing is the normal standard, documented, and it is what insurers, code officials and auditors ask to see.

As long as fuel, oil and cooling allow, which on a properly designed system means days rather than hours. A standby-rated set is intended for the duration of an outage with a limited number of running hours per year; a prime-rated set can run continuously with a varying load. Runtime in practice is a fuel storage question: a base tank might give 8 to 24 hours at full load, a bulk tank gives days, and beyond that it becomes a delivery schedule. On long events, priority fuel contracts are worth having in place before the event rather than during it.

Most of the installation happens with production running: the pad, the set, the fuel system, the exhaust and the majority of the electrical work are all outside the live distribution. The cutover to the transfer switch does need an outage window, and that window is planned around your schedule, usually a weekend or a shutdown. Where even that is not acceptable, we bring in a temporary rental set to carry the critical load during the cutover so the plant never sees a dark minute.

Yes, and a large part of our industrial work is exactly that. We maintain and repair Cummins, Caterpillar, Generac Industrial, Kohler, Detroit and MTU equipment on sites where the original installer is long gone, and we take over service contracts on machines that have not been load tested in years. The first visit on an inherited machine is normally a full inspection and a load bank test, because until it has carried real load nobody can honestly say what it will do.

Small commercial systems covering a critical panel start around $15,000 to $25,000 installed, mid-size systems for clinics, restaurants and offices commonly run $30,000 to $70,000, and larger diesel installations with service-entrance switching go well past $100,000. The generator itself is often only half the project; switchgear, site work, fuel systems and permitting make up the rest. Because the critical-load decision changes the total so much, we quote after a walk-through rather than over the phone.

The normal commercial standard is quarterly or semi-annual inspections with one full service a year, plus weekly automatic exercise. A full service covers oil and filters, air and fuel filters, coolant condition, belts and hoses, a battery load test, controller and alarm checks and a transfer test. Sites with life-safety loads, insurance requirements or franchise obligations often need annual load bank testing on top, with documented results. We do the work and issue the record, because on a commercial site the paperwork gets asked for as often as the machine gets used.

Yes, and it happens constantly in the Inland Empire because so much commercial space is leased. It needs the landlord in the conversation early, since the equipment is usually a permanent alteration and the lease will have something to say about it. Where the term is short or the landlord is difficult, a rental unit on a monthly rate, or a skid-mounted set that can leave with you, is the practical answer. We have done both often enough to know which questions the landlord will ask.

It can, but it rarely should on the first system. Covering the entire electrical service means paying for capacity to run everything at once, including the loads that could comfortably go dark for a day. Most businesses get better value from a critical panel that carries refrigeration, servers, security, essential lighting and one air conditioning zone, at a fraction of the size and cost. If the building later needs full coverage, a system designed with that in mind can usually be extended rather than replaced.

Contracted maintenance customers get 24-hour emergency response, and because we are based in Riverside rather than dispatching from Los Angeles or Orange County, a call from Fontana, Ontario, Perris or Moreno Valley is a short drive. Most emergency calls are batteries, fuel problems, coolant or controller settings rather than serious engine faults, and we carry the common parts on the truck so the majority are fixed on the first visit.

For a residential standby unit: one full service a year covering oil and oil filter, air filter, spark plugs on gas engines, a battery load test, coolant on liquid-cooled models, a controller and alarm check and a transfer test under load, with valve clearances checked at the longer intervals. Commercial and industrial sets normally run quarterly or semi-annual inspections with an annual full service, plus annual load bank testing where insurers or code require it. Between visits, the machine should be exercising itself weekly, and somebody should notice if that stops happening.

We install Generac, Kohler, Cummins and Champion, and we service those plus Caterpillar, Briggs and Stratton, Detroit, MTU, Onan and most other equipment that turns up on Inland Empire sites, including machines whose original installer is long out of business. On inherited equipment the first visit is usually a full inspection and a load test, since that is the only honest way to find out what condition it is really in.

The battery, by a wide margin. Standby generators sit idle, batteries age faster in Inland Empire heat, and three to five years is a realistic life here. After that it is fuel: stale gasoline in a portable, degraded diesel or plugged filters in a standby set, or a gas supply pressure problem. Then controllers left in the wrong mode after a previous service, and sensors shutting the engine down to protect it. All of those are ordinary service items rather than serious engine faults, which is why an annual visit prevents most of them.

Yes, for both homes and businesses. A residential plan is normally one visit a year with priority scheduling; commercial plans run quarterly or semi-annually with 24-hour emergency response, annual load bank testing where required, and documentation for insurers and landlords. Contracted customers are first in the queue during a regional outage event, which is the point at which priority stops being a marketing word. Plans also keep manufacturer warranties valid on newer equipment, since almost all of them require documented maintenance.

Roughly at the point where one repair costs more than a third of a replacement and the machine has no obvious life left after it. On an air-cooled residential unit that tends to arrive somewhere past year fifteen, usually when a controller or an alternator fails, and the honest answer is that you are funding half a new install to keep an old one going. Liquid-cooled and diesel plant is the opposite case: those blocks are built to be rebuilt, and a set with a documented service history is worth putting money into well past twenty years. We price both paths and let you pick, and there is nothing wrong with a repair that buys you one more fire season while you plan properly.

Contracted maintenance customers come first, then everyone else in order of severity and location. During a normal week we are same-day across most of the Inland Empire. During a regional event, such as a wind-driven shutoff affecting Corona, Rancho Cucamonga and the Redlands foothills at once, everybody in the industry is stretched and priority is genuinely the only thing that moves you up the list. That is the argument for the annual visit in September rather than the emergency call in October.

Rates are set by size and duration. Small portable units run roughly $75 to $150 a day. A 20kW to 60kW towable diesel set, which covers most job sites and events, is around $250 to $600 a day, $900 to $1,800 a week or $2,000 to $4,000 a month. Units of 100kW to 200kW cost more, and larger industrial sets are quoted per job. Fuel is billed separately, delivery within the Riverside area is included, and the longer rates are dramatically cheaper per day, so anything running more than about three days should not be on a daily rate.

Anything at a site without enough power for what you are plugging in, which is most outdoor venues. Weddings at ranch and vineyard properties around Norco and Jurupa Valley, festivals and fairs, food truck gatherings, farmers markets, film and photography shoots, corporate functions in park settings, and sporting events with timing and PA systems. Construction and industrial sites are the other half of the business. The common thread is that the cost of the power failing is much higher than the cost of the generator, which is why event rentals are usually specified with a margin rather than sized to the edge.

Units are delivered with a full tank. On short hires you either return it full or we refuel it and bill the fuel at cost. On anything running more than a few days we put the unit on a scheduled delivery and monitor the tank level, so the site does not run dry mid-job. Consumption depends on load: as a rough guide a 60kW diesel set at half load will use in the region of three to four gallons an hour, which is why base tank capacity and delivery scheduling matter more than the hourly figure on its own.

It is set by the largest starting load, not the total of the nameplate ratings. Motors, compressors, lifts and air conditioning all draw several times their running current for a second or two at start, and a set sized on running load will trip every time. Tell us what is plugging in and roughly how it will be used, and we will size it. As rough guides: a small event with lighting, a sound system and catering usually sits on 20kW to 40kW; a framing crew with tools and a trailer on 25kW to 60kW; a warehouse fit-out with lifts and welders on 100kW and up.

Usually next day across the Riverside area, and same day for emergencies when we have the right unit on the yard. Event bookings should be made further ahead than people expect, particularly for super-silent units in wedding season, since the quiet machines are the first to go. During a regional outage event the whole rental fleet in the region tightens up quickly, so if you are planning around fire season it is worth booking rather than assuming.

For a defined project, almost always. For a recurring need, rarely. A month of towable rental costs a fraction of an installed system, so for a build, an event or a shutdown, renting is clearly right. But two or three seasonal rentals typically add up to a meaningful share of a permanent installation that also raises property value and needs no arranging each time. We will give you both numbers honestly, including the running cost of ownership, because we do both and have no reason to push you either way.