Home battery guides
Research-backed guides on buying, financing, and living with a home battery. No paid placements; some product links are affiliate links, disclosed on the page that carries them. Every claim is sourced and dated.
Will a home battery work with my inverter?
Thirteen of the seventeen batteries we track carry their own inverter, so your existing one is irrelevant. For the other four it decides everything. Which is which, from the datasheets.
AC-coupled vs DC-coupled home batteries: what conversion costs
AC-coupled vs DC-coupled home batteries: one maker publishes 89 percent AC coupled and 94 percent DC coupled for the same battery, with the measurement basis.
Adding a battery to existing solar: the three retrofit paths
Adding a battery to existing solar is a different purchase from buying both together. Three retrofit paths, and the datasheet lines that decide which is open.
Battery backup for an aquarium: air pump first, heater math second
Battery backup for an aquarium: Fluval publishes 2 to 4 watts for its air pumps and 100 to 300 watts for its heaters. That gap decides what you actually need.
Chest freezer battery backup: the 48 hours before you need one
Battery backup for a chest freezer: federal guidance gives a full freezer about two days with the door shut. That number decides whether you need a battery.
Does solar work in a power outage? Why grid-tied panels shut down
Does solar work in a power outage? Grid-tied solar shuts down when the grid does, per IEEE 1547-2018. What changes that is a battery and an islanding device.
Enphase IQ Battery cost factors
Enphase IQ Battery cost: Enphase publishes no price for the IQ Battery 5P or the 10C. What its own documents say about the decisions that move a quote.
How long is food safe in an outage? The fridge and freezer math
How long food is safe in an outage: the federal windows are 4 hours for a refrigerator and 24 or 48 hours for a freezer, and both come with conditions.
FranklinWH aPower 2 cost factors
FranklinWH aPower 2 cost: no published price for the aPower 2 or the aGate. What the documentation says moves a quote, and why the controller matters more.
Garage door opener battery backup: what the law already built in
Battery backup for a garage door opener: California has required a battery inside every residential opener sold there since July 2019. What that battery holds.
Pairing a portable generator with a battery
Pairing a portable generator with a battery: the generator runs a few hours to refill it, then the battery carries the night. Published input and fuel figures.
Do Home Batteries Affect Homeowners Insurance?
Home batteries and homeowners insurance: nobody publishes rate data, so we publish none. What is documented is which coverage line a hardwired battery lands in.
Home battery installation cost: where the money goes
Home battery installation cost: equipment is the minority of a storage quote. The published federal-lab evidence on how the cost splits, and how old it is.
Motor-start and surge ratings by model: the LRA table
Home battery surge ratings: six of the 17 models we track publish a motor-start rating in locked rotor amps. Nine publish a peak in watts, the rest none.
Home battery vs UPS: two different halves of the outage problem
Home battery vs UPS: a UPS keeps one load energised without a break, a home battery carries the house for hours with a small gap. Most houses need both.
Home battery warranty comparison: all 17 models in one table
Every home battery warranty document we could obtain, read line by line: the term, the throughput cap, the capacity floor, and the conditions attached.
What Happens When a Home Battery Is Full?
What happens when a home battery is full: charging stops on a voltage and current threshold. Where the next solar kilowatt-hour goes, and what it is worth.
Outdoor home battery installs: IP and NEMA ratings by model
Outdoor-rated home batteries: enclosure ratings and outdoor stance for all 17 models we track, from each datasheet. One publishes IP30 and calls itself indoor.
Battery backup for an oxygen concentrator
Battery backup for an oxygen concentrator: published draw figures run from 100 W to 590 W, and one major maker publishes none. Here is the sizing arithmetic.
Battery backup for a pellet stove
Battery backup for a pellet stove: an outage stops it. Three manufacturer-published electrical ratings, and the gap between the start figure and the run figure.
Plug-in vs installed: the real cost gap
Plug-in vs installed battery cost: power station makers publish hardware, transfer panel and labor prices. Installed battery makers publish none of the three.
Tesla Powerwall 3 Expansion Units Explained
Tesla Powerwall 3 Expansion units are 13.5 kWh batteries with no inverter in them. That single fact decides what an expansion adds and what it cannot add.
Battery backup for security cameras and alarms
Battery backup for security cameras and alarms: alarm panels carry a code-required battery, cameras carry nothing, and the recorder dies with the router.
Space heater on a battery: the honest math
Space heater on a battery: a 1,500 W resistive heater against the published watt hours of the largest portable units runs under two to just over four hours.
Battery backup for Starlink: what the dish actually draws
Battery backup for Starlink: Starlink publishes an average power figure for every kit. The sizing arithmetic, and the DC path that skips the inverter.
SunVault replacement cost reality
SunVault replacement cost: nobody publishes a price to repair or replace one. What each of the three companies does publish, and the cost items that decide.
Can You Take a Home Battery When You Move?
Taking a home battery when you move: physically yes, contractually almost never. Eleven warranty documents tie coverage to the original installation address.
Tesla Powerwall 3 cost: published prices and what installers add
Tesla Powerwall 3 cost: equipment prices are published in Australia and the UK but not the US. What those lists contain, and what sits between them and a quote.
120V vs 240V power stations for home backup
120V vs 240V power stations: which loads actually need 240V, which units publish a split-phase output, and through which port the watts come out.
The 48E lease path: how battery leases still get federal credit in 2026
Section 25D is gone, so a 2026 cash buyer gets $0 federal credit. Section 48E survived, but it belongs to whoever owns the system, not to you.
Anker SOLIX F3800 Plus vs EcoFlow DELTA Pro 3 for home backup
Anker SOLIX F3800 Plus vs EcoFlow DELTA Pro 3, compared from their own spec tables: capacity, expansion ceilings, and where the watts actually come out.
Backup power for renters and apartments: no-install options
Backup power for renters and apartments: five plug-in power stations with published specs, the loads they carry, and why 240V appliances are off the table.
What size battery keeps a refrigerator running?
What size battery keeps a refrigerator running: turn its published annual kWh into an average watt figure, divide, and you get runtime with a stated basis.
Backup power for home medical equipment
Backup power for home medical equipment: sizing math for oxygen concentrators, wheelchair chargers, and home dialysis from published draw figures.
Load shifting with a home battery: TOU arbitrage explained
Load shifting with a home battery: charging off-peak and discharging on-peak, the one formula that decides whether it works, and two real PG&E tariffs.
What size battery runs an air conditioner during an outage?
What size battery runs an air conditioner: window unit versus central AC from published watts, why start surge is the gate, and what soft start cannot fix.
ConnectedSolutions explained: battery pay in MA, RI, NH, and CT
ConnectedSolutions pays home battery owners in Massachusetts, Rhode Island, and New Hampshire. Why Connecticut differs, and how to check before you buy.
Continuous vs peak output: reading home battery power ratings
Continuous vs peak power on home battery ratings: continuous kW runs the house, peak kW starts the motors, and peak durations vary widely by manufacturer.
CPAP battery backup: sizing and runtime math
CPAP battery backup: what a CPAP draws by ResMed's own published figures, why the humidifier changes the answer, and how to turn rated Wh into runtime.
What is a critical loads panel and what should go on it?
A critical loads panel is the physical answer to essential backup. What it is, and how circuits get chosen using published appliance wattages.
Plug-in whole-home backup: EcoFlow DELTA Pro Ultra vs Tesla Powerwall 3
EcoFlow DELTA Pro Ultra vs Tesla Powerwall 3: what each maker publishes on capacity, power, expansion, and warranty, and what the category difference costs.
Generac PWRcell 2: what changed from the original PWRcell
The Generac PWRcell 2 is not a refreshed PWRcell. It is a different architecture with the same battery module size, traced to Generac's own spec sheets.
Generac PWRcell cost: what actually drives the installed price
Generac PWRcell cost is not one number. Here are the seven things in Generac's own documents that move the figure on your quote, and how to read a bid.
Hawaiian Electric BYOD Plus: the program that replaced Battery Bonus
Hawaiian Electric BYOD Plus replaced Battery Bonus, now closed to new participants. The published incentive terms, the daily commitment, and the catches.
Can a home battery charge an EV? The kWh math
Can a home battery charge an EV? Electrically yes, and the arithmetic is unforgiving. The kWh math against real EV pack sizes and Level 2 charger draw.
Do home batteries work in cold weather? What the datasheets publish
Home batteries in cold weather: every one we read publishes a low-temperature limit, and most publish two, one for discharging and a higher one for charging.
Home battery degradation: what datasheets actually guarantee
Home battery degradation: a capacity retention floor and a throughput cap are two different promises on two different clocks. What datasheets guarantee.
Home battery dimensions and weight compared across 17 models
Home battery dimensions and weight for every model we track, sorted heaviest to lightest, with the lift weights that decide how a unit arrives.
How loud is a home battery? Noise ratings from datasheets
How loud is a home battery? Thirteen of the 17 we track publish a decibel figure, only five say at what distance they measured, and four publish nothing.
Battery round trip efficiency compared: 17 models and their measurement basis
Home battery round trip efficiency compared across 17 models, from 85.4 to 98 percent, and why sorting by the number sorts by measurement basis.
Home battery operating temperature limits: heat and cold by model
Home battery operating temperature limits for all 17 models we track: published operating, recommended, and storage ranges, plus derating thresholds.
How fast do home batteries switch over in an outage? Transfer times by model
Home battery transfer times: five of the 17 models we track publish a number, from under 16 ms to about 100 ms. Twelve publish the word seamless instead.
Hurricane season backup power checklist
Hurricane season backup power checklist: a charge-ahead timeline built on National Hurricane Center watch and warning lead times, plus a load priority list.
Which home batteries use LFP chemistry? A datasheet roundup
Which home batteries use LFP chemistry, by what each datasheet states: twelve say LFP or LiFePO4 in print, one says NMC, four state no chemistry we can use.
New Jersey's storage incentive program: status and how it works
New Jersey's storage incentive program, renamed the Garden State Energy Storage Program: why homeowners still cannot apply as of August 2026.
How many batteries to go off-grid? Sizing beyond backup
How many batteries to go off-grid: backup sizing asks how you survive one outage, off-grid sizing asks how you survive every December. Here is the arithmetic.
Puerto Rico home battery programs and the outage reality
Puerto Rico home battery programs: LUMA's Customer Battery Energy Sharing, the aggregators that actually pay you, and where net metering stands under Act 10.
SGIP in practice: application steps and waitlist reality
The SGIP application process in practice: who actually submits, the reservation and claim steps in order, and what the step tracker showed when we read it.
Sump pump battery backup: dedicated systems vs power stations
Sump pump battery backup: a dedicated 12V pump and a portable power station solve the same outage differently. What the pump datasheets leave out.
SunVault owner's next step: replacement and takeover options
SunVault replacement options for owners: who actually services it now, what a takeover does and does not cover, and how replacing it compares.
Tesla Powerwall alternatives: eight batteries compared by datasheet
Tesla Powerwall alternatives: eight all-in-one home batteries set against the Powerwall 3 on published capacity, power, efficiency, and warranty terms.
How long does a Tesla Powerwall last? Warranty math and degradation
How long does a Tesla Powerwall last? Tesla publishes a warranty, not a lifespan. What the ten-year terms and the throughput cap actually guarantee.
Texas battery VPPs: Tesla Electric, Octopus, and utility plans compared
Texas battery VPP programs compared, with terms quoted from their own pages. In a deregulated market the program travels with your retail plan.
Transfer switch vs interlock: connecting portable power to your panel
Transfer switch vs interlock: what each listed device does for connecting a power station to your panel, and why the third option people try is illegal.
UL 9540 and NFPA 855 in plain English: battery fire-safety rules
UL 9540, UL 9540A, and NFPA 855 in plain English: a product certification, a fire test method, and an installation standard, and who names them.
Battery backup for a well pump: the 240V and start-current problem
Battery backup for a well pump: makers publish locked rotor amps, and running that figure against the surge ratings of 240V power stations breaks most plans.
Where can you install a home battery? Garage, outdoor, and setback rules
Where to install a home battery: placement is decided by fire code first and the datasheet second. What NFPA 855 permits and what UL 9540 limits.
Keeping warm in a winter outage: what a battery can and can't run
Keeping warm in a winter outage: resistive heat and battery storage are a bad match, and the furnace blower is the load worth backing up instead.
The work-from-home outage kit: router, laptop, Starlink
The work-from-home outage kit: modem and router draw, Starlink's own published figure, and why the laptop is the one load you should not be backing up.
Home battery installation: process, permits, and timeline
What happens between signing and switch-on: site assessment, sizing, permits, interconnection, inspection, and commissioning, with honest notes on timing.
Home battery virtual power plant programs, state by state (2026)
The 41 documented home battery VPP programs across 24 states in our data, named by administrator, with honest limits on what the source table can tell you.
Home battery warranties compared: years, cycles, and throughput
Warranty terms for every home battery we track: 10 to 15 year terms, cycle caps, throughput limits, and capacity floors, quoted as each datasheet states them.
Does a Home Battery Make Sense Without Solar?
Without solar a battery has one savings engine and one charge. Here is when time-of-use arbitrage pays, when it does not, and when backup justifies the cost.
How Long Can a Home Battery Power a House?
The runtime math, honestly. Usable kWh divided by your average load, with real appliance draws, real power limits, and the things that shorten the answer.
How Many kWh of Home Battery Do You Need? A Sizing Guide
Size a home battery from your own utility bill. Usable versus nameplate kWh, essential versus whole-home loads, and how stacking actually works on real models.
NEM 3.0 and home batteries: how the math changed
The mechanics of California's net billing tariff: where export credits come from, the rate plan you must take, the adder deadline, and how a battery changes it.
Portable power station vs home battery: which backup fits
Plug-in power stations vs installed home batteries: what each can actually back up, the transfer switch question, and why neither gets a federal credit in 2026.
SunPower SunVault discontinued: what owners and buyers should do
SunPower Corporation went bankrupt in 2024 and another company bought the brand. What that means for SunVault warranty, monitoring, service, and buyers now.
Tesla Powerwall 2 in 2026: discontinued, still worth buying?
The Powerwall 2 is out of production and part of the fleet was recalled in 2025. What its specs say, how it compares to Powerwall 3, and the used-market risks.
Best plug-in home battery backup (2026)
Best plug-in home battery backup for 2026: five power stations that back up home circuits without an installed system, read from their own datasheets.
Best home battery for whole-home backup (2026)
Best home battery for whole-home backup in 2026, decided by two datasheet numbers: continuous power and surge power. Five batteries, and the home each fits.
Home battery backup: the complete guide
How home battery backup really works: runtime math, sizing, battery vs generator, and whether solar recharges you during a long outage.
How much does a home battery cost in 2026?
A typical installed home battery runs about $12,000 to $20,000 before incentives in 2026. Here is the honest breakdown of what you actually pay.
Battery storage incentives, by state (2026)
The 30% federal credit expired at the end of 2025. In 2026 home battery incentives are state and utility specific: 10 of 50 states have a statewide purchase incentive open to general applicants, and California's SGIP general-market budget is closed.
Battery vs generator: the honest comparison
A battery stores power and pays you back daily. A generator makes power and runs for days. Here is the honest tradeoff, against interest, for real outages.
Time-of-use plans, explained
What time-of-use plans are, how to read yours, and how to find the peak-to-off-peak spread that decides whether a home battery actually pays.
When a home battery is NOT worth it (5 situations)
When a home battery is not worth it: the five situations where it does not pay, including flat rate plans, reliable grids, and short timelines.
How $0-down battery leasing works in 2026
$0 down does not mean free. In a 2026 battery lease the provider owns the hardware, the tax credit, and the upside. Here is the real trade.
Is there still a home battery tax credit in 2026?
The home battery tax credit in 2026: Section 25D terminated Dec 31 2025. What that means for a buyer, what survived, and where California's SGIP stands now that its general budget is closed.