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.
120V vs 240V power stations for home backup
Which loads actually need 240V, which power stations publish a split-phase output and through which port, and why one of them turns its 120V outlets off when you press the 240V button.
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. Here is the actual mechanism behind every $0-down offer.
Anker SOLIX F3800 Plus vs EcoFlow DELTA Pro 3 for home backup
Two 240V-capable power stations compared from their own spec tables: capacity, expansion ceilings, where the watts actually come out, and the four figures Anker publishes for the base F3800 but not for the Plus.
Backup power for renters and apartments: no-install options
What a renter can actually back up without touching the panel: five plug-in power stations with published specs, the loads they carry, and why 240V appliances and transfer switches are off the table.
What size battery keeps a refrigerator running?
Turn a refrigerator's published annual kWh into an average watt figure, divide, and you have a runtime number with a stated basis. Plus the startup surge nobody publishes and the four hours you may not need to cover.
Backup power for home medical equipment
Sizing math for oxygen concentrators, power wheelchair chargers, and home dialysis, using manufacturer-published draw figures, plus what utility medical registries actually do and do not provide.
Load shifting with a home battery: TOU arbitrage explained
The mechanics of charging off-peak and discharging on-peak, the one formula that decides whether it works, and worked examples on two real PG&E tariffs where the same battery earns 79 cents a day on one plan and loses money on the other.
What size battery runs an air conditioner during an outage?
Window unit versus central AC, using published watts and locked-rotor amps. Why start surge, not capacity, is the gate, what soft start does and does not fix, and which loads need an installed system.
ConnectedSolutions explained: battery pay in MA, RI, NH, and CT
What ConnectedSolutions actually pays a home battery owner in Massachusetts, Rhode Island, and New Hampshire, why Connecticut is a different program entirely, and how to check before you buy.
Continuous vs peak output: reading home battery power ratings
Continuous kW runs the house, peak kW starts the motors. The durations attached to those peak figures range from 300 milliseconds to 30 minutes depending on the maker, which is why two peak ratings are rarely comparable.
CPAP battery backup: sizing and runtime math
What a CPAP actually draws according to ResMed's own published figures, why the humidifier setting changes the answer by roughly four times, and how to turn a power station's rated Wh into a runtime number with stated assumptions.
What is a critical loads panel and what should go on it?
A critical loads subpanel is the physical answer to essential backup. What it is, how circuits get chosen using published appliance wattages, and how smart controllers from FranklinWH, Panasonic, Qcells, and Generac change the question.
Plug-in whole-home backup: EcoFlow DELTA Pro Ultra vs Tesla Powerwall 3
A plug-in expandable power station against a permanently installed battery. What each maker publishes on capacity, power, expansion, grid interaction, and warranty, and what the category difference costs you.
Generac PWRcell 2: what changed from the original PWRcell
The PWRcell 2 is not a refreshed PWRcell. It is a different architecture with the same battery module size. Every difference below is traced to Generac's own spec sheets for both generations.
Generac PWRcell cost: what actually drives the installed price
We do not publish a PWRcell price, because there is no such thing as one. Here are the seven things in Generac's own documents that move the number on your quote, and how to read a bid against them.
Hawaiian Electric BYOD Plus: the program that replaced Battery Bonus
Battery Bonus is closed to new participants. BYOD Plus is what Hawaii homeowners can actually enroll in now, with the published incentive terms, the daily two-hour commitment, and the catches.
Can a home battery charge an EV? The kWh math
Electrically yes, and the arithmetic is unforgiving. The largest home battery we track holds under a fifth of the smallest F-150 Lightning pack, and a Level 2 charger at full draw exceeds the entire continuous output of 14 of the 16 models we track.
Do home batteries work in cold weather? What the datasheets publish
Every home battery we read publishes a low-temperature limit, and most publish two: one for discharging and a higher one for charging. What that split means for a battery on an unheated garage wall in January.
Home battery degradation: what datasheets actually guarantee
A capacity retention floor and a throughput cap are two different promises measured on two different clocks. Six of the models we track publish a floor. The rest publish an energy or cycle limit instead, or nothing at all.
Home battery dimensions and weight compared across 17 models
Published height, width, depth and weight for every home battery we track, sorted heaviest to lightest, with the lift weights that decide whether a unit arrives in one piece or five.
How loud is a home battery? Noise ratings from datasheets
Thirteen of the 17 home batteries we track publish a decibel figure. Only five say at what distance they measured it, and four publish nothing at all. What each datasheet actually states, and what a single number leaves out.
Battery round trip efficiency compared: 17 models and their measurement basis
Published round trip efficiency for every home battery we track, from 85.4 to 98 percent. Sort the list by the number and you sort it by measurement basis, because the top of the table is not measuring an AC round trip at all.
Home battery operating temperature limits: heat and cold by model
Published operating, recommended and storage temperature ranges for all 17 home batteries we track, with the derating thresholds that sit 10 to 30 degrees inside the headline limit.
How fast do home batteries switch over in an outage? Transfer times by model
Five of the 17 home batteries we track publish a transfer time, from under 16 ms to about 100 ms. Twelve publish the word seamless and no number. What that means for the devices in your house that reboot.
Hurricane season backup power checklist
A charge-ahead timeline built on the National Hurricane Center's own published watch and warning lead times, a load priority list with the arithmetic behind it, and an honest read on recharging after landfall.
Which home batteries use LFP chemistry? A datasheet roundup
Every home battery we track, sorted by the cell chemistry its own datasheet states: LFP, NMC, or not specified. Twelve models say LFP or LiFePO4 in print. Four datasheets say nothing we can call a chemistry, and one of those four answers it in a different document.
New Jersey's storage incentive program: status and how it works
The program renamed from NJ SIP to the Garden State Energy Storage Program. What is open today, what Phase 2 will pay a homeowner, and why there is still no residential battery incentive to apply for as of August 6, 2026.
How many batteries to go off-grid? Sizing beyond backup
Backup sizing asks how you survive one outage. Off-grid sizing asks how you survive every December. The arithmetic from EIA's published household consumption, and which tracked products even scale far enough.
Puerto Rico home battery programs and the outage reality
LUMA's Customer Battery Energy Sharing program, the aggregators that actually pay you, where net metering stands under Act 10, and what federal outage data says about the grid you would be backing up.
SGIP in practice: application steps and waitlist reality
Who actually submits an SGIP application, the reservation and claim steps in order, and what the program's own step tracker showed on the day we read it. Homeowners do not apply directly.
Sump pump battery backup: dedicated systems vs power stations
A dedicated 12V backup pump and a portable power station solve the same outage differently. What the pump datasheets publish, what they leave out, and why the missing starting-current figure is the whole problem.
SunVault owner's next step: replacement and takeover options
Your SunVault is aging and nobody obvious owns it. Here is who actually services it now, what a takeover does and does not cover, and what replacing it looks like against the batteries we track.
Tesla Powerwall alternatives: eight batteries compared by datasheet
Eight all-in-one home batteries set against the Powerwall 3, using only what each manufacturer publishes: usable capacity, continuous and peak power, round-trip efficiency with its stated basis, and the warranty term and its cap.
How long does a Tesla Powerwall last? Warranty math and degradation
Tesla does not publish a lifespan for Powerwall. It publishes a warranty: ten years, 70 percent of 13.5 kWh retained, and either unlimited cycles or a 37.8 MWh throughput cap depending on how you use it. Here is what those terms actually guarantee.
Texas battery VPPs: Tesla Electric, Octopus, and utility plans compared
Four Texas battery programs with terms quoted from their own pages, plus the ERCOT pilot underneath them. In a deregulated market the program travels with your retail plan, not your utility, which changes what you should ask.
Transfer switch vs interlock: connecting portable power to your panel
A power station's headline wattage lives on its 240V port, and reaching your panel takes one of two listed devices. What a manual transfer switch and a breaker interlock each do, what the published specs say, and why the third option is illegal.
UL 9540 and NFPA 855 in plain English: battery fire-safety rules
One is a product certification, one is a test method, and one is an installation standard. What each covers, in the issuing bodies' own words, and which of the batteries we track name them on their datasheets.
Battery backup for a well pump: the 240V and start-current problem
Well pump makers publish the one number sump pump makers do not: locked rotor amps. Run that figure against the published surge ratings of 240V-capable power stations and most of the plans people make stop working.
Where can you install a home battery? Garage, outdoor, and setback rules
Placement is decided by fire code first and by the datasheet second. What NFPA 855 permits in a house, what UL 9540 limits, and which enclosure rating each tracked model publishes.
Keeping warm in a winter outage: what a battery can and can't run
Resistive heat and battery storage are a bad match, and the arithmetic is not close. What a 1,500 W space heater costs against published watt hours, and why the furnace blower is the load worth backing up instead.
The work-from-home outage kit: router, laptop, Starlink
A battery backup for a wifi router is a small problem with published numbers. Modem and router draw, Starlink's own 75 to 100 W 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)
Five power stations that can back up home circuits without an installed system. What the datasheets say about output, 240V support, and switchover, and where the headline watts actually come from.
Best home battery for whole-home backup (2026)
Whole-home backup is decided by two datasheet numbers: continuous power and surge (peak) power. Here are five batteries that publish enough power to carry a whole house, and which home each one 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, and uneven, with California the clear standout.
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)
The 5 situations where a home battery does not pay, from an independent site that will tell you when to skip it. Flat rate plans, reliable grids, short timelines, and more.
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?
Section 25D (the 30 percent residential purchase credit) terminated Dec 31 2025. Here is what that means for a 2026 buyer, what survived, and how California SGIP fills part of the gap.