Can’t I just plug my generator into a dryer outlet?

No. That practice, called backfeeding, sends generator power onto supposedly dead utility lines and has killed lineworkers; it also violates the National Electrical Code and utility tariffs, can destroy the generator when the grid returns, and jeopardizes insurance coverage after a fire. The only legal ways to power house circuits are a listed manual transfer switch or a mechanical interlock kit installed by a licensed electrician.

Will a cheap portable generator actually run my furnace or well pump?

Often not on its own. A furnace blower draws 600–900 watts running, but a well pump can surge to three times its running watts on start-up, and a unit sized only for running loads stalls exactly there. Read the nameplate or manual for both running and starting watts, keep 20–30 percent headroom above the biggest surge, and prefer an inverter model if electronics matter. This failure mode is precisely why the sizing worksheet comes first.

Do I need a permit for backup power?

A portable generator sitting outdoors feeding extension cords generally needs no permit. The moment anything is wired into the house — a transfer switch or interlock — most jurisdictions require an electrical permit and inspection, and a permanent standby adds a gas-line permit almost everywhere. Fees typically run $50–$600. Call the local building department before scheduling installation; unpermitted work complicates insurance claims and home sales.

Is a home battery worth it compared to a generator?

It depends on the outage profile. A typical 10–13.5 kWh battery silently carries essentials for most of a day, needs no fuel or exhaust precautions, and can recharge from solar, but it stores energy at a high cost per kWh and struggles past day one without sun or a generator. Combustion delivers multi-day runtime cheaply if fuel remains obtainable. Note that the 30% federal residential battery credit ended for property placed in service after December 31, 2025, so price the comparison on current state and local incentives rather than the old credit.

Can I install a standby generator myself?

Realistically no. A standby install combines a natural-gas or propane connection, 240-volt wiring, a transfer switch, pad construction, permits, and inspection, and most manufacturers require an authorized dealer’s installation for the warranty to hold. Homeowners legitimately handle siting, pad prep, and contractor selection; the gas and electrical work belongs to licensed trades in nearly every jurisdiction.

What if I already own a generator that turned out too small?

Keep it and right-size its job. An undersized unit still runs refrigeration, lights, phone charging, and often a furnace blower if heavy loads start in sequence; a soft-start kit or load-management module can rescue marginal cases. If a well pump or central air is the true must-run load, either move up to a larger dual-fuel unit or fold those loads into a standby or battery plan — and wire whichever machine stays through a transfer switch, never an outlet.

Power Outage Insurance: Size a Generator or Battery Backup That Actually Runs Your House

Backup power that starts, connects legally, and carries the loads that matter: a sized-and-chosen portable, standby, or battery system wired through permitted transfer equipment, with its fuel cost and hours-of-runtime per outage day known in advance. Readers with rooftop solar finish knowing why their array goes dark in an outage and which retrofit changes that.

Fby Finito HQEchipa Finito

Created 2 weeks agoUpdated 2 weeks ago

Free preview: 4 of 25 steps

Work through them in the real run view, exactly as a buyer does. No account, no payment, nothing saved.

Try it free

Free

3 free unlocks per month — yours to keep forever

Updated Aug 2026

Start for free

Try 4 of 25 steps free

No account needed — nothing is saved.

Included with every copy

Your own copy — keep it forever
Gets better over time — free updates included
Run it on web and mobile
Invite a partner to go through it with you — you share the same progress
Make it your own — a private copy you can edit to fit your situation
The playbook's community — ask questions, get additions, and see how other buyers improve it, right on the step

Save

Who it's for

Homeowners in outage-prone regions — hurricane belts, ice-storm country, wildfire public-safety-shutoff zones, or anywhere the lights flicker weekly — especially those who already own a portable generator that stalls on the furnace or well pump. Equally useful for anyone choosing among portable, standby, and battery classes for the first time. Not aimed at renters, off-grid homesteads, or commercial properties.

About this playbook

A reference playbook for homeowners tired of outages that a cheap portable cannot ride out. Six lookup sections cover the whole chain: measuring real running and starting watts, choosing between portable, standby, and battery hardware, connecting through legal transfer equipment, clearing permits and code setbacks, budgeting fuel and maintenance per outage day, and pairing storage with rooftop solar. Every entry stands alone — open at the symptom or decision at hand and leave with a number, a rule, or a recorded fact. It does not cover brand-by-brand reviews, off-grid living, or RV and jobsite use, and it assumes United States jurisdictions throughout.

What you'll do, step by stepFree preview

6 phases · 25 steps

Only a sample is open: 4 of 25 steps can be read in full. The rest unlock when you buy.

Phase 1: Size the load a backup must actually carry
5 steps
Phase 2: Choose between portable, standby, and home battery
5 steps
Phase 3: Connect backup power without killing a lineman
4 steps
Phase 4: Clear permits, codes, and inspections
4 steps
Phase 5: Budget fuel, maintenance, and runtime per outage day
4 steps
Phase 6: Pair backup power with rooftop solar
3 steps

Try 4 of 25 steps free

Unlock all 25 stepsFree

Details

Estimated duration7 hours 55 min

Steps25

Estimated budget$0 to size on paper; $450–$16,000 to buy and connect equipment (USD)

What you need first

Access to appliance nameplates or model numbers (a phone camera helps), knowledge of the electrical panel location and main-breaker rating, a recent utility bill, and notes on any medically necessary devices. No electrical experience is assumed: every step that touches house wiring routes through a licensed electrician. Readers with rooftop solar should identify their inverter model before reaching the solar sections.