Service
Home battery backup installation
A battery stores power for outages. How much of the house it backs up decides most of the design.
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Written by HyreElectrical Research Desk Primary-source research and fact checking
The short answer
Home battery backup installation is a job for a licensed electrician, often with a solar installer: the battery and inverter connect to the panel through a backup gateway or critical-loads panel, under NEC Article 706 and the fire code’s location rules. Whole-home backup needs more capacity than backing up a few essential circuits.
Whole home or critical loads
A critical-loads design moves essentials (fridge, lights, internet, a well pump) to a critical loads panel. Whole-home designs back up the main panel and rely on load management.
Large 240-volt loads like central AC or an electric range may be excluded or managed.
Location and fire rules
NFPA 855 sets limits on how much energy storage goes in each location; NFPA’s summary lists higher limits for garages and outdoor walls than for utility closets. Local fire codes adopt their own editions.
Batteries are not allowed in living spaces in many codes.
What the job includes
Mounting the battery and inverter, a backup gateway or transfer device, rewiring circuits to a critical-loads panel if used, solar integration, and commissioning. Utility interconnection paperwork is needed if it ties to solar.
Permit, time and what changes the price
Electrical and often fire permits, plus utility approval for grid-tied systems.
Price drivers: capacity, whole-home vs critical loads, panel changes, solar integration, location work. No price ranges are published here until we hold enough sourced, dated quotes; see cost guides.
Battery or generator
Batteries are quiet with no fuel but limited energy; generators run as long as fuel lasts. Some homes use both. See generator installation and the outage cost tool. Check the license on your state board before anyone starts: how to check an electrician license.
Sizing the battery
Two numbers matter: power, how much the inverter can deliver at once, and energy, how long it can keep it up. A battery that can start a well pump or central AC needs enough power for the motor’s start-up surge, not just its running load.
List what must run in an outage and for how long. The generator sizing tool gives a rough load list that also works for batteries.
What a fair written quote lists
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Questions
Can a battery back up my whole house?
Where can a home battery go?
Do I need solar?
Battery or generator?
Written and audited by
HyreElectrical Research Desk
Primary-source research and fact checking
We read the model code, the federal safety notice, the municipal fee sheet or the utility tariff ourselves, and we publish the figure with the document it came from and the date we retrieved it.
Where a number cannot be traced to a primary source, we publish the shorter page and say what we could not verify. HyreElectrical does not perform, supervise or warrant electrical work. Authorship is organizational: this desk, not a named persona.
- 16
- original research studies published
- 5
- states with verified license records
- 16,369
- electrical companies in those records
- 74%
- of the store is Florida — disclosed first, not footnoted
How this desk works
- Primary sources only. Code statements come from NFPA 70 as the model code. Safety statements come from CPSC. Permit fees come from the city or county fee sheet. Utility charges come from the filed tariff. We do not cite a blog that cites a source; we open the source.
- Our contractor store is five states, and 74% of it is Florida. Any figure built on that store is titled to those states and names the concentration in the first screen. It is not a national sample of electricians.
- Load calculations on this site are a published simplification in the shape of NEC 220.82 — first 10 kVA at 100%, remainder at 40%, HVAC at 100%, EVSE at 125%. They are labeled as not a stamped calculation. A licensed electrician using the adopted edition does that work.
- No national price for a panel upgrade is shipped. Labor rates, the adopted code edition, whether the utility is involved, and the state of the existing wiring move the invoice too far for a roundup to help. The cost pages publish named permit fees and the variables that move the price instead.
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Authorship on this site is organizational: the analysis belongs to the desk rather than to a named individual, and we do not publish credentials we do not hold. Our editorial policy sets out how we source, date and correct what we publish.
Sources & retrieval dates
HyreElectrical is a publisher. It does not perform, supervise, inspect or warrant electrical work, holds no electrical license, and matching is still being built, so an inquiry is not a service call.
This page is general information, not a diagnosis or a quote. Code rules vary by the NEC edition your state or city adopted and its local amendments.