"How much does a home battery cost?" has two honest answers. If a solar installer quotes it, the number usually lands between $13,000 and $16,500 for a single Powerwall-class battery, installed. If you buy the equipment yourself and hire a local electrician for the connection, you can get the same or more storage for roughly half - and with a portable system and a transfer switch, a quarter. This guide puts real numbers side by side: price per kWh, total cost by backup level, what you give up with each route, and the sizing math to decide how many kWh your house actually needs.
Every DIY system below is in stock and active in our store on October 23, 2026, shown at the store price before any promo code. Powerwall figures come from published installed-cost quotes in 2026; installer prices vary by state, roof and electrical panel, so treat them as a range, not a quote.
1. Whole-home battery backup cost in 2026 at a glance
Three numbers frame the market this year:
- Installed Powerwall 3: published quotes of about $13,000-$16,500 for one 13.5 kWh unit with 11.5 kW of continuous output; one unit plus an expansion pack (27 kWh) runs about $19,000-$22,500 installed.
- U.S. average installed home battery: about $15,650 for a 13.5 kWh system before incentives, based on 2026 marketplace quote data.
- DIY 48V battery + hybrid inverter: $4,544-$10,999 for 14-29 kWh of storage in the systems we stock, or about $270-$450 per kWh before installation.
The chart compares cost per kWh of storage - the fairest way to compare a 3.84 kWh portable unit with a 28.7 kWh wall system. Two caveats keep it honest. The Powerwall bars include installation; the green DIY bars do not, so add your electrician's quote (see section 4). And the blue plug-in systems include a transfer switch or home panel, which is part of what makes them "home backup" rather than just a big power station.
2. Powerwall vs DIY: what you get for the money
| Feature | Tesla Powerwall 3 (installed) | DIY 48V system (EG4 / BigBattery) | Plug-in system (Anker / Jackery) |
|---|---|---|---|
| Typical cost | $13,000-$16,500 | $4,544-$10,999 + install | $3,149-$6,199 |
| Storage | 13.5 kWh per unit | 14.3-28.7 kWh in one order, expandable | 3.84-20.16 kWh |
| Cost per kWh | about $963-$1,222 | about $270-$450 (equipment) | about $546-$937 |
| Continuous output | 11.5 kW | 6-12 kW from the battery per inverter, stackable | 6-14.4 kW |
| 240V loads (well pump, AC) | Yes | Yes (120/240V split phase) | Yes on the models listed below |
| Solar charging | Built-in solar inverter | Built-in MPPT (8-21 kW PV depending on inverter) | Built-in, up to 3.2 kW per unit |
| Installation | Installer only | Licensed electrician + permit | Plug in; transfer switch or panel by electrician |
| Battery warranty | 10 years | 10-12 years (battery) | 5 years on the models listed |
| Move it later | No | No (wall or rack mounted) | Yes, on wheels |
The trade-off is simple. A Powerwall buys you a turnkey install, one app and one phone number for service. DIY buys you two to three times the kWh for the same budget, more inverter power, and parts you can expand or replace one at a time - in exchange for doing the research and hiring your own electrician. Plug-in systems sit in between: the cheapest way to back up essentials, and the only option you can take with you if you move.
3. How many kWh does your home need?
"Whole-home" means different things to different households. Start from what you actually want running when the grid is down, not from the size of the house.
Step 1: daily energy
The average U.S. home uses about 29 kWh a day, but outage use is much lower once you skip the dryer, oven and EV. Look at your utility bill for kWh per month and divide by 30, then remove what you will not run. Typical outage budgets:
- Essentials (fridge, freezer, lights, Wi-Fi, phones, sump pump): about 4-8 kWh a day.
- Partial home (add a well pump, gas furnace blower, microwave, some cooking, a window AC): about 12-16 kWh a day.
- Whole home with central AC or heat pump: about 25-35 kWh a day in summer, more in a cold-climate winter with electric heat.
Step 2: battery size
Battery kWh = daily kWh x days without sun or grid / 0.9. The 0.9 covers inverter losses and the reserve most systems keep. Example: a partial-home load of 14 kWh a day for one full day needs 14 / 0.9 = about 15.5 kWh - one EG4 WallMount 16 kWh battery. With 6 kW of solar and 4 peak sun hours (about 18 kWh a day at 75% efficiency), the same battery keeps up indefinitely in good weather.
Step 3: inverter power
Add the running watts of everything that can be on at once, then check the biggest motor start. A 3-ton central AC can run around 3,500 W and start well above that; a 1 HP well pump about 1,500-2,000 W running. Most whole-home setups need 8-12 kW continuous at 120/240V; essentials-only setups manage with 3.6-7.2 kW. Need help with motor surge? Our solar generator sizing guide walks through running vs starting watts, and the Solar Kit Calculator turns an appliance list into battery, inverter and panel sizes.
4. The real cost: equipment, install and the parts people forget
The chart shows the price range for each backup level. On the DIY side the equipment bill is only part of it. Budget for:
- Electrician labor and permit. Connecting a hybrid inverter and wall battery to your main panel is a licensed-electrician job in most places. Quotes depend heavily on local rates and on how far the battery sits from the panel. A planning figure we use is $2,000-$5,000; get two local quotes.
- Panel work. A critical-loads subpanel, a main breaker or a panel upgrade can add $1,000-$3,000. Whole-home inverters with 200 A pass-through (such as the EG4 18kPV) can avoid a separate subpanel.
- Wiring and protection. Battery cables, breakers or fuses, conduit and a rapid-shutdown device if you add rooftop solar. Bundled systems include the battery-side cables; AC-side materials are usually on the electrician's list.
- Solar (optional). A battery alone only lasts as long as its charge. Pairing it with panels turns a one-day backup into a multi-day one.
Even with $5,000 of installation added, the 20.48 kWh ETHOS + EG4 18kPV system lands around $13,700 - about the price of one installed Powerwall 3, with roughly 7 kWh more storage and 12 kW of output. The gap widens as you add batteries, because each extra EG4 WallMount adds 16 kWh for about $3,400-$3,750 while a Powerwall expansion pack adds 13.5 kWh for about $6,200.
5. Systems we stock today, by price per kWh (prices checked October 23, 2026)
| System | Storage | Output | Voltage | Price today | Per kWh | Best for |
|---|---|---|---|---|---|---|
| Anker SOLIX F3800 Plus + Home Power Panel | 3.84 kWh | 6,000 W | 120/240V | $3,599.99 | $937 | Essentials, renters, no wall install |
| Jackery Explorer 5000 Plus + Smart Transfer Switch | 5.04 kWh | 7,200 W | 120/240V | $3,989 | $791 | Essentials with automatic switchover |
| Anker F3800 Plus + BP3800 + Home Power Panel | 7.68 kWh | 6,000 W | 120/240V | $5,298.99 | $690 | Essentials for 1-2 days |
| Jackery Whole-Home Backup Kit 5000 Plus | 20.16 kWh | 14,400 W | 120/240V | $10,999 | $546 | Whole home, no wall install |
| NEXUS 14.3 kWh + EG4 6000XP | 14.3 kWh | 6,000 W | 120/240V | $4,544 | $318 | Lowest cost partial home, off-grid |
| EG4 WallMount 16 kWh (indoor) + FlexBOSS21 | 16 kWh | 12,000 W battery (about 10,200 W with one battery) / 16,000 W with solar + grid | 120/240V | $7,092 | $443 | Grid-tied solar homes |
| BigBattery ETHOS 20.48 kWh + EG4 18kPV | 20.48 kWh | 12,000 W | 120/240V | $8,683.99 | $424 | Whole home, UL 9540 system |
| EG4 PowerPro 12 kW 28.7 kWh | 28.7 kWh | 12,000 W | 120/240V | $8,685 | $304 | Most kWh per dollar |
| EG4 WallMount 16 kWh battery only | 16 kWh | - | 48V DC | $3,399.99 | $212 | Adding storage to an existing inverter |
| 4 x Sungold SG48100P server rack | 20.48 kWh | - | 48V DC | $4,320 | $211 | Rack battery bank, 7,000 cycles |
Per-kWh figures are the store price divided by rated storage. Output is the inverter's rated continuous AC power from the spec sheet; during an outage at night, battery-only output is what counts - and it can be capped by the battery bank's own discharge rating. The two battery-only rows need a compatible 48V inverter; check the manufacturer's compatibility list before pairing brands.
6. Our picks
BigBattery ETHOS 20.48 kWh + EG4 18kPV - $8,683.99
20.48 kWh of LiFePO4 storage (6,000 cycles, 12-year battery warranty) with the EG4 18kPV hybrid inverter: 12 kW continuous output and up to 18 kW of solar input. It is sold as a UL 9540 energy storage system, which is what many inspectors and utilities ask for, and the 12 kW rating is available from the battery, so it can carry a well pump, furnace and central AC circuits at night. The inverter also passes through 200 A of grid power, which can avoid a separate critical-loads subpanel. Expands to about 82 kWh with more ETHOS modules, or step up to the 30.72 kWh version for $10,808.99.
EG4 WallMount 16 kWh (indoor) + FlexBOSS21 - $7,092
A 16 kWh self-heating LiFePO4 wall battery (12.86 kWh recommended usable, UL 9540A tested, 10,000 cycles, 10-year warranty) paired with the FlexBOSS21 split-phase hybrid inverter. Read its output ratings carefully: the FlexBOSS21 delivers up to 16 kW continuous with solar and grid working together and 12 kW from the battery alone, but one WallMount battery is rated for 10.2 kW of continuous discharge - so with this single-battery kit, plan on about 10 kW at night during an outage, or add a second battery to unlock the full 12 kW. It shines in homes with a large solar array (up to 21 kW of PV input) that want to store daytime production and keep net metering. The same kit with two batteries (32 kWh) is $10,750.
EG4 PowerPro 12 kW 28.7 kWh - $8,685
About 28.7 kWh of storage and a 12 kW split-phase inverter for roughly the price of the battery portion of one installed Powerwall. At about $304 per kWh it is the cheapest complete system we stock per unit of storage, and it covers a whole day of typical outage use even without solar. Only a few units are in stock today.
NEXUS 14.3 kWh + EG4 6000XP - $4,544
14.3 kWh of storage with a 6 kW 120/240V off-grid inverter - enough for a fridge, freezer, well pump, furnace blower and lights for about a day. The 6000XP is an off-grid inverter (it does not sell power back to the utility), so it suits cabins, rural homes and critical-loads subpanels. Add a second battery for 28.6 kWh at $7,689.
Jackery Whole-Home Backup Kit 5000 Plus (20 kWh) - $10,999
Two Explorer 5000 Plus units, two 5,040 Wh battery packs and the Smart Transfer Switch: 20.16 kWh and 14.4 kW combined at 120/240V. The power stations sit on the floor on wheels and the transfer switch moves your circuits over automatically in about 20 ms. You still need an electrician to install the switch, but there is no wall-mounted battery or inverter, and you can take the stations with you if you move.
Anker SOLIX F3800 Plus + Home Power Panel - $3,599.99
3,840 Wh and 6,000 W at 120/240V with Anker's Home Power Panel for circuit-level backup. It runs the fridge, lights, Wi-Fi and a 240V well pump through short outages, takes up to 3,200 W of solar and grows to 53.8 kWh with expansion batteries and a second unit. Want a full day of essentials? The version with one BP3800 expansion battery (7.68 kWh) is $5,298.99.
7. Which route is right for you?
- Choose an installed Powerwall if you want one contractor to handle design, permit, install and warranty, you already have or are buying rooftop solar from an installer, and the price premium is worth the convenience.
- Choose a DIY 48V system if you want 15-30+ kWh and up to 12 kW of battery output per inverter for well under the price of one Powerwall, you have a trusted local electrician, and you like owning parts you can expand later. Browse grid-tied systems with battery backup or the full range of big batteries for home backup.
- Choose a plug-in system with a transfer switch if you rent, may move, or only need essentials during a few outages a year. See all solar backup generators with a transfer switch and our comparison of the best solar generators for home backup.
8. What our customers ask
Most whole-home battery questions we get by phone, text and email follow a few patterns (shared here without any personal details):
- "Can I do this instead of a Powerwall quote?" Many buyers arrive with an installer quote in hand and want the equipment cost for the same kWh. The answer is usually yes - the decision is whether they have an electrician who will install customer-supplied equipment.
- Large complete kits. Questions about 12 kW systems with 20-30 kWh of storage are the most common big-ticket requests, often for rural homes with well pumps.
- Price checks against other sites. Shoppers sometimes text us links to the same kits at prices that look too good. Some of those pages are copycat stores using real product listings - buy only from authorized dealers you can call.
- Delivery and handling. Battery systems ship on pallets by freight. Customers often ask about delivery dates and whether they need a trailer or helpers - plan for liftgate delivery and two people for wall batteries.
- Sizing from a bill. The fastest path is a photo of a utility bill or an appliance list; we run it through the Solar Kit Calculator and send back a battery and inverter size.
9. Current codes
As of October 23, 2026 these codes are active at checkout (one code per order): SAVE250 ($250 off orders of $4,000+) and SAVE500 ($500 off $8,000+), which cover most of the battery systems above, plus ECO100 ($100 off $1,500+) and ECO50 ($50 off, no minimum). ECOBLACK2026 ($150 off $2,000+ on selected products) is scheduled for November 20 - December 1; our Black Friday solar deals hub tracks every verified price and code.
10. FAQ
How much does a whole-home battery backup cost in 2026?
One installed Tesla Powerwall 3 (13.5 kWh) is typically quoted at $13,000-$16,500, and the U.S. average installed home battery is about $15,650. DIY 48V systems with a battery and hybrid inverter cost about $4,500-$11,000 for 14-29 kWh before electrician installation.
Is a DIY home battery cheaper than a Powerwall?
Yes, usually by half or more per kWh. DIY systems cost about $270-$450 per kWh for equipment versus about $960-$1,220 per kWh for an installed Powerwall 3. Even after $2,000-$5,000 of electrician labor and permits, a 16 kWh DIY system typically costs less than one Powerwall.
How many kWh do I need to back up my whole house?
Essentials need about 4-8 kWh a day, a partial home with a well pump and furnace about 12-16 kWh, and a whole home with central AC about 25-35 kWh. Battery size = daily kWh x days of backup / 0.9; add solar to recharge during long outages.
Can one battery run central air conditioning?
Only if the inverter can deliver the AC's running and starting watts at 240V. A 3-ton unit typically needs 8-12 kW of inverter capacity once other loads are counted. Systems with 12 kW of battery output, such as the EG4 18kPV or the EG4 PowerPro 12 kW, can; check the battery-only rating, because some hybrid inverters reach their headline output only with solar and grid help. A soft starter on the compressor also helps.
Is there a federal tax credit for home batteries in 2026?
Not for homeowners who buy a system. The 25D Residential Clean Energy Credit ended for expenditures after December 31, 2025. Some states and utilities offer their own battery rebates, and leased or third-party-owned systems may benefit from business credits claimed by the owner.
How long do home backup batteries last?
LiFePO4 home batteries are rated for about 6,000-10,000 cycles and typically carry 10-12-year warranties on DIY wall and rack batteries and 10 years on the Powerwall. At one cycle a day that is well over 15 years of rated cycle life.
Ready to price your own system? Compare all BigBattery backup systems, EG4 lithium batteries and hybrid solar inverters, or send us your bill and we will size it for you.
Serhii Dovzhenko, Solar & Energy Storage Specialist at Eco Solar Kits · LinkedIn
Serhii is based in Vancouver, BC, and works on product data, system sizing and buyer guides for Eco Solar Kits. He attends solar and energy storage industry conferences and is involved in the community of electricians in Vancouver, BC. Credit for the data verification in this guide goes to Adsec.ca.