Home battery backup costs anywhere from about $700 to over $20,000, and the range is not about quality — it is about which of three fundamentally different routes you take. A portable power station running extension cords, a portable unit wired through a transfer switch, and a permanently installed whole-home system are three different products that get described with the same phrase.
The three routes, side by side
| Portable + cords | Portable + transfer switch | Whole-home install | |
|---|---|---|---|
| Total cost | $500–3,000 | $2,000–6,000 | $12,000–25,000+ |
| Typical capacity | 1–3 kWh | 2–6 kWh | 10–40 kWh |
| Covers hardwired circuits | No | Yes | Yes |
| Automatic switchover | No | No, manual | Yes, milliseconds |
| Runs air conditioning | No | No | Usually |
| Professional install | None | Half a day | 1–3 days |
| Takes it with you | Yes | Yes | No |
| Permits required | No | Usually | Yes |
| Adds home value | No | Slightly | Yes |
Route 1: portable, extension cords — $500 to $3,000
A large power station on the kitchen floor with heavy-gauge extension cords running to the fridge, the router and a couple of lamps. It is not elegant, and for most households it is the right first purchase.
What it covers: anything with a plug. A fridge, a freezer, internet, phones, laptops, lighting, a CPAP, a television. In a typical outage that is 80% of what you actually miss.
What it does not: anything hardwired. Your furnace, your well pump, built-in lighting, the garage door opener. These need Route 2.
What to spend: a 2,000Wh unit with 2,000W+ output runs $700–1,500 and covers a day of essentials. Add $300–800 in solar panels and it recharges itself indefinitely in decent weather, which is what converts it from a one-shot device into genuine resilience.
The strong argument for starting here is that the money is not trapped. The unit goes camping, powers a job site, sits in the car on a road trip, and moves house with you. A permanently installed battery does exactly one job and stays with the building.
Route 2: portable, wired in — $2,000 to $6,000
The same portable unit, plus an electrician installing a manual transfer switch or an interlock kit at your panel. In an outage you flip a switch and selected circuits run from the battery.
The added cost is typically $500–1,500 for the switch and installation, with the remainder going into a larger battery, because now you are feeding circuits rather than individual appliances.
What this unlocks: the gas furnace, which for many households is the single most valuable circuit to back up. Also the well pump on smaller systems, hardwired lighting, and the ability to power things without running cords through doorways.
This is the sweet spot for a lot of homes: it covers the furnace and the fridge, costs a fraction of a full installation, and the battery remains portable. Our gas furnace guide covers the wiring options and a subtle grounding issue that catches people out.
A smart panel is the modern version of this. Products that replace or supplement your breaker panel with circuit-level control let you choose what runs during an outage and shed loads automatically. They cost more than a manual switch — often $2,000–4,000 installed — and they make a mid-size battery go considerably further.
Route 3: permanent whole-home system — $12,000 to $25,000+
A wall-mounted battery, an inverter, an automatic transfer switch, permits, and a professional installation. The power goes out and you barely notice; lights flicker for a few milliseconds, if at all.
| System | Usable capacity | Typical installed cost |
|---|---|---|
| Single mid-size battery | 10–13 kWh | $12,000–18,000 |
| Two batteries | 20–27 kWh | $20,000–30,000 |
| Battery added to existing solar | 10–13 kWh | $10,000–16,000 |
| Battery and solar together | 10–13 kWh + 7kW PV | $28,000–45,000 |
Roughly 40–50% of that figure is installation, permitting, electrical work and the installer’s margin rather than the battery itself. This is why quotes for the same hardware vary so widely between companies, and why getting three quotes is genuinely worth the afternoon.
What you get for the money: automatic switchover, enough capacity to run air conditioning and heavy loads, integration with solar so the battery refills daily, and in some markets the ability to earn money by exporting to the grid during peak demand.
What you should know before signing: capacity figures are often quoted as nameplate rather than usable; continuous output matters as much as capacity, exactly as it does on portable units; and whether the system supports partial-home or whole-home backup changes what it will actually run.
Cost per kilowatt-hour
Normalizing by capacity makes the comparison clearer, and less flattering to the installed systems:
- Portable power station: roughly $300–500 per kWh
- Portable with expansion batteries: roughly $250–400 per kWh
- Installed whole-home system: roughly $1,000–1,500 per kWh
Installed systems cost three to four times as much per unit of storage. You are buying automatic operation, higher output, code-compliant integration and a warranty on the whole assembly rather than on a box. Whether that premium is worth it depends almost entirely on how often and how long your power actually goes out.
Tax credits and incentives in 2026
This is the part of every older article that is now wrong, and it changes the arithmetic substantially.
The federal Residential Clean Energy Credit (Section 25D), which returned 30% of the cost of home battery and solar installations to homeowners, was terminated for property placed in service after 31 December 2025. If you are budgeting in 2026 from an article written in 2023, you are likely assuming a discount of several thousand dollars that no longer applies to a straightforward homeowner purchase.
Verify this against your own circumstances before budgeting either way. Tax law changes, the rules differ for business and third-party-owned systems, and the treatment of leases and power purchase agreements is not the same as a cash purchase. Speak to a tax professional rather than relying on any article, including this one.
What remains worth investigating:
- State and utility incentives. These continue in many places and can be substantial. California’s SGIP, Massachusetts and Connecticut demand-response programs, and various state storage rebates are all live examples.
- Virtual power plant programs. Several utilities pay households to let them draw on a home battery during peak demand — sometimes several hundred dollars a year, sometimes a large upfront rebate. This is one of the better returns available on a home battery and is easy to miss.
- Time-of-use arbitrage. Where peak and off-peak rates differ sharply, charging overnight and discharging in the evening produces a real, if modest, return.
- Net metering rules. These vary by state and have been getting less generous. They affect whether pairing with solar makes financial sense.
None of these apply to portable units, which is worth weighing: an installed system may attract incentives that partly close the cost gap, and a portable one never will.
The costs quotes leave out
- Electrical panel upgrade. If your panel is old or full, budget $1,500–4,000. This is the most common surprise line item.
- Permits and inspection. $200–1,000 depending on jurisdiction.
- Utility interconnection. Sometimes free, sometimes several hundred dollars, and sometimes slow — weeks or months in some areas.
- Critical loads sub-panel. If you are backing up part of the house rather than all of it, $1,000–2,500.
- Battery replacement. Warranties typically run 10 years to 70–80% capacity. Plan for a replacement in year 12–15.
- Roof work. If solar is part of the plan and the roof has under ten years left, do the roof first.
Does a home battery pay for itself?
Honestly, usually not on electricity savings alone — and it is worth being clear about that, because most sales conversations imply otherwise.
With favorable time-of-use rates, a battery might save $300–600 a year through arbitrage. Against a $15,000 installed cost that is a 25–50 year payback, well beyond the warranty. Add a virtual power plant program paying a few hundred dollars annually and it improves, but rarely to the point of paying for itself before it needs replacing.
The honest framing is that a home battery is insurance and comfort, not an investment. What it buys is not losing a freezer full of food, keeping medical equipment running, not moving out during an extended outage, and not thinking about weather forecasts. For people on a well, with medical needs, who work from home, or in an area with a genuinely poor grid, that value is real and easy to justify. For someone whose power goes out twice a year for two hours, it is very hard to justify against a $900 portable unit.
Where the economics do work is in places with frequent multi-day outages, high peak rates, generous state incentives, or existing solar that is currently exporting for very little credit.
Which route suits your outages
Look up your utility’s published reliability figures rather than relying on impressions — most publish SAIDI and SAIFI numbers, which tell you average outage duration and frequency. Then:
- A few hours, a few times a year: Route 1. A 1,000–2,000Wh portable unit. Spending more is buying a solution to a problem you do not have.
- Occasional overnight outages, gas heat: Route 2. The transfer switch pays for itself in a single cold night.
- Multi-day outages, or a well pump: Route 2 with a large expandable unit and solar, or Route 3 if the budget exists.
- Frequent, long outages, or medical dependency: Route 3, sized for the loads you cannot compromise on.
- Existing solar with poor export rates: Route 3 makes the most financial sense here, because the battery captures value you are currently giving away.
A reasonable strategy for most people is to start at Route 1, learn what you actually miss during an outage, and upgrade with that knowledge. It is much cheaper than specifying a $15,000 system based on a guess.
Frequently asked questions
How much does whole house battery backup cost?
A permanently installed whole-home system typically costs $12,000–25,000 including installation, for 10–27 kWh of usable capacity. A portable power station covering essential appliances costs $500–3,000, and a portable unit wired through a transfer switch runs $2,000–6,000. Roughly 40–50% of an installed system’s price is labor, permitting and margin rather than hardware.
How many kWh do I need to back up my house?
For essential loads — fridge, lights, internet, a gas furnace blower — 2–5 kWh per day is realistic. For whole-home backup including air conditioning, 20–30 kWh per day. Most homes install 10–20 kWh, which covers essentials comfortably for a day or two and everything for a shorter period.
Is there still a 30% tax credit for home batteries?
The federal Residential Clean Energy Credit under Section 25D was terminated for property placed in service after 31 December 2025, so a straightforward homeowner purchase in 2026 does not attract it. State and utility incentives continue in many areas and can be significant. Because tax rules change and treatment differs for leases, power purchase agreements and business installations, confirm your own position with a tax professional before budgeting.
Is a home battery cheaper than a generator?
No, not on purchase price. A whole-home standby generator runs roughly $5,000–15,000 installed against $12,000–25,000 for a battery system. The battery is silent, needs no fuel or maintenance, works automatically, and can pair with solar. The generator runs indefinitely as long as it has fuel. Our battery vs generator comparison covers the trade-offs in detail.
Can I install a home battery myself?
No, and you should not try. Grid-tied battery systems require permits, utility interconnection approval and a licensed electrician, and improper installation can endanger utility workers as well as your household. Portable power stations, by contrast, need no installation at all — which is a large part of their appeal.
How long do home batteries last?
Typically 10–15 years, with warranties generally guaranteeing 70–80% of original capacity at the 10-year mark. Almost all use LiFePO4 chemistry, rated for several thousand cycles. Budget for replacement around year 12–15 when assessing whether a system pays back.
Will a home battery run my air conditioning?
An installed whole-home system usually will, though it drains quickly — central air at 3,000–5,000W can consume a 13 kWh battery in three to four hours. Portable power stations generally cannot start central air at all. A mini-split or a window unit is far more manageable and is what most battery owners actually run.
Start smaller than you think. Most people who buy a $15,000 system would have been well served by a $1,200 portable unit and a transfer switch. Browse home backup systems or portable power stations, or work through the sizing guide first to find out what you actually need.