Backup Generators · Service

A standby generator is automatic backup — not a bigger portable

Standby means the generator sits permanently installed, senses an outage, starts itself and transfers loads through a transfer switch. If that automatic chain is not what you want, you are shopping a different product.

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In short

What is standby generator?

A standby generator is a permanently installed backup power system that starts automatically when utility power fails and feeds selected circuits (or the whole service) through a transfer switch so utility and generator power cannot connect at once. Fuel is typically natural gas or propane piped to the unit; the engine sits on a pad outside. If you must roll a machine out, plug inlet cords and pull a start cord or press a button every outage, it is not standby — it is portable or temporary power.

Triggers

Signs you need standby generator

You want lights, heat or medical equipment to return without you being home
Outages are long enough or frequent enough that manual portable setup is unreliable
You are willing to permit a permanent outdoor unit, fuel connection and electrical transfer equipment
A portable generator already failed you because nobody was home, or cords and transfer were unsafe
Work-from-home or sump/well dependence makes automatic coverage feel necessary
You are comparing “standby” quotes and need to know what automatic actually includes
You work from home and cannot rely on being present to start a portable during storms
Medical equipment, a sump pump or a well makes automatic coverage feel non-optional
Quotes use the word standby but the scope still requires manual cords — you need the distinction clear

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The job

How standby generator actually works

Define standby: sensing, start, transfer, cool-down

Utility voltage is monitored. On sustained loss, the generator starts, reaches stable voltage and frequency, then the transfer switch moves load to generator power. When utility returns cleanly, load transfers back and the generator cools down and shuts off. Weekly exercise cycles keep the machine ready. Put site-specific constraints in writing before deposits — that is where these projects usually go wrong.

Watch for: A “standby” quote that is actually a large portable with an inlet. Ask whether start and transfer are automatic with no manual cord plug-in. If the answer is vague, pause before signing.
Load decision — whole home vs managed essential circuits

Standby systems are sized to a load list. Whole-home coverage and essential-circuits coverage are both “standby”; they are not the same generator size or switch. Be honest about air conditioning, well pumps and EV chargers. Put site-specific constraints in writing before deposits — that is where these projects usually go wrong.

Watch for: A kW number with no load list. Capacity without a list is a brochure. If the answer is vague, pause before signing.
Transfer equipment as part of the product

Automatic transfer switches (and service-entrance rated equipment where used) are half the safety story. Interlock kits on portables are a different, manual category. Standby without a proper transfer method is incomplete. Put site-specific constraints in writing before deposits — that is where these projects usually go wrong.

Watch for: Generator-only pricing that leaves transfer “to your electrician later.” Later is how projects stall half-installed. If the answer is vague, pause before signing.
Fuel and site as enablers, not afterthoughts

Piped natural gas or propane, pad, clearances, noise rules and exhaust direction make automatic power possible. Those details are expanded on whole-home and fuel pages; here the point is that standby assumes them. Put site-specific constraints in writing before deposits — that is where these projects usually go wrong.

Watch for: A unit sold before anyone checks gas meter capacity or setbacks. Automatic dreams die on site constraints. If the answer is vague, pause before signing.
Commissioning and exercise

A finished standby system is tested under transfer, not only started in the driveway. You should know how exercise works, what the app or lights mean, and who services the machine. Put site-specific constraints in writing before deposits — that is where these projects usually go wrong.

Watch for: Handover without a transfer test. Starting in open air is not the same as carrying the house. If the answer is vague, pause before signing.
Maintenance is part of ownership

Oil, filters, battery, exercise and periodic load tests keep automatic systems actually automatic. A neglected standby unit fails on the night you need it — quietly, until then. Put site-specific constraints in writing before deposits — that is where these projects usually go wrong.

Watch for: No maintenance conversation in the sales process. Ask for a service plan before you sign. If the answer is vague, pause before signing.
Compare true standby quotes against portable-plus-inlet honestly

For rare short outages with someone always home, portable power can be rational. For automatic coverage when the house is empty, medical loads, wells or long storms, standby is the product class. Force the comparison with your actual outage history, not a neighbour’s fear. Put site-specific constraints in writing before deposits — that is where these projects usually go wrong.

Watch for: A salesperson who refuses to discuss portable alternatives when your history is mild. Honesty here builds trust for the bigger project. If the answer is vague, pause before signing.
Plan service access for the life of the machine

Standby units need annual service, battery attention and room for technicians. Enclosures jammed against walls or buried in landscaping become unserviceable. Access paths and clearances are ownership design, not only install day geometry. Put site-specific constraints in writing before deposits — that is where these projects usually go wrong.

Watch for: A pretty plant screen that blocks the service panel and oil access. Landscaping should not strand the maintenance the machine requires. If the answer is vague, pause before signing.

Money

What does standby generator cost?

Standby generator projects price as a system: generator, transfer equipment, pad, fuel connection, electrical work and permits. Unit kW is only one driver; automatic transfer and fuel work often dominate. Portable generators sit in a completely different, lower band and are not comparable line items.

See the full standby generator cost guide — by material, size and region →

Straight answer

When standby generator is the wrong call

Everyone else ranking for this is paid when you say yes. Here's when you shouldn't.

Outages are rare and short, and you are always home. A quality portable with a safe inlet may be enough without permanent install cost.
You will not maintain the machine. Automatic systems that are never exercised become expensive lawn ornaments.
Fuel supply cannot support a permanent unit. No gas service and no place for propane tanks means standby is not ready for your site.
Setbacks, HOA rules or noise limits forbid a permanent outdoor unit. Confirm before you fall for a kW chart.
You only need to keep a freezer cold for a few hours. Right-size the problem; full standby may be overkill.
Someone sold you “standby” that still needs manual cords every time. That is mislabeled portable infrastructure — price and plan it as such.
The quote is a large portable, an inlet and a manual interlock labeled as standby. Rename it and price it as portable infrastructure — or buy true automatic transfer.
You want silent, maintenance-free backup with no outdoor equipment. Look at battery storage conversations; engines are not that product.

Your options

Types of standby generator

Whole home generator installation

Full project: siting, pad, permits, lead time.

Natural gas / propane fuel decision

What the machine burns and the gas work.

Transfer switch

How loads move between utility and generator.

Portable generator

Manual backup when automatic is not justified.

Compare backup generators options side by side →

Before you sign

What to check when hiring for standby generator

Is start and transfer fully automatic, and which transfer equipment is included?

This is the definition of standby. Get it in the quote body.
What load list is this kW sized to?

Without a list, whole-home claims are guesses. Prefer a written answer on the quote body.
Who permits electrical and fuel work, and is that in the price?

Standby is multi-trade. Split responsibility creates orphan steps. Prefer a written answer on the quote body.
What is the exercise schedule and monitoring setup at handover?

Automatic only stays automatic if the machine is kept ready. Prefer a written answer on the quote body.
What maintenance plan do you offer for year one and after?

Service access matters as much as brand badges. Prefer a written answer on the quote body.
How does this differ from a portable + inlet alternative for my outage pattern?

Honest installers can explain when standby is overkill. Prefer a written answer on the quote body.
Will you demonstrate a full utility-outage simulation at handover with me present?

Starting in open air is not the same as carrying house loads through transfer. Prefer a written answer on the quote body.
What monitoring, app or indicator lights explain status to a non-technician?

Automatic systems still need human-readable health signals. Prefer a written answer on the quote body.
How are exercise schedules set to balance readiness and neighbour noise?

Weekly runs are normal; timing and placement affect whether you keep peace. Prefer a written answer on the quote body.

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Local pros

Standby Generator near you

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Related work

Often done at the same time

Whole Home Generator

Full install project

Transfer Switch

Switching equipment

Natural Gas Generator

Fuel decision

Generator Maintenance

Keep automatic ready

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FAQ

Standby Generator — questions people ask

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Is a standby generator the same as a whole home generator?

Whole-home is a coverage level; standby is the automatic product class. Many whole-home systems are standby generators. You can also have standby power on essential circuits only. Use “standby” for automatic behaviour and “whole home” when you mean every circuit. Ask follow-up questions until the answer is specific to your site, not a brochure paragraph.

How fast does a standby generator restore power?

After a short validation that utility is really gone, start and transfer typically complete in seconds to about a minute depending on settings and machine — not hours. Exact timing varies by brand and configuration; ask for the setting used at commissioning. Ask follow-up questions until the answer is specific to your site, not a brochure paragraph.

Can a standby generator run on gasoline?

Residential permanent standby units are overwhelmingly natural gas or propane for automatic, long-duration fuel without refilling cans. Gasoline is the portable world. If a quote depends on you refueling during ice storms, re-read the product class. Ask follow-up questions until the answer is specific to your site, not a brochure paragraph.

Do I need a transfer switch for a standby generator?

Yes — automatic transfer equipment is how standby systems connect loads safely. Backfeeding a panel with double-male cords is dangerous and illegal in normal practice. Do not skip transfer to “save money.” Ask follow-up questions until the answer is specific to your site, not a brochure paragraph.

What size standby generator do I need?

Size follows a load list and starting loads of motors (wells, A/C), not square footage alone. A dealer or electrician should calculate, not guess from a neighbour’s unit. Managed load systems can shrink generator size if you accept that not everything runs at once. Ask follow-up questions until the answer is specific to your site, not a brochure paragraph.

What does automatic transfer actually prevent?

It keeps utility power and generator power from connecting at the same time — a backfeed hazard that can kill lineworkers and destroy equipment. It also sequences start, warm-up, load transfer and return to utility without you standing in the dark with cords. That automation is the product class called standby. Anything that still needs you to plug inlet cords every outage is a different product. Ask follow-up questions until the answer is specific to your site, not a brochure paragraph.

How is standby different from a whole-home generator?

Standby describes automatic behaviour. Whole-home describes coverage of essentially the full service. You can have standby power on essential circuits only, or a whole-home standby system. Use the words carefully when comparing quotes: a large portable with an inlet is not standby, and a small automatic unit is still standby even if it does not run every circuit. Ask follow-up questions until the answer is specific to your site, not a brochure paragraph.

Why do standby generators exercise weekly?

Engines and transfer systems need periodic runs to stay ready, circulate fluids and reveal faults before a real outage. Exercise is normal ownership, not a defect — and it is what neighbours hear most years. Placement and noise rules matter because the machine will start on a schedule, not only in storms. Maintenance and battery care keep exercise from becoming a no-start surprise. Ask follow-up questions until the answer is specific to your site, not a brochure paragraph.