Whole-home battery cost
An installed battery, like the Tesla Powerwall, is wired into your panel and switches on automatically when the grid goes down.
Installed batteries in our data
| Battery | Capacity | Output | Surge | Price listed | |
|---|---|---|---|---|---|
| Tesla Powerwall 3 | 13.5 kWh | 11,500 W | 22,000 W | $9,300 (equipment, per comparison site) source (2026-10 (prices fluctuate; promos)) | Maker's page ↗ |
| FranklinWH aPower 2 | 15 kWh | 10,000 W | 20,000 W | $10,500 (per comparison site) source (2026-10 (prices fluctuate; promos)) | Maker's page ↗ |
All cost data
| Item | Cost | Source |
|---|---|---|
| Installed home battery (~13.5 kWh) | ~$15,647 typical; ~$1,130-$1,159/kWh | www.energysage.com |
| Tesla Powerwall 3 (13.5 kWh) | $9,300 (equipment price as listed by comparison site; install extra) | homegridhq.com |
| Heat pump installed | avg $15,393 upfront; ducted avg $14,529; mini-split avg $25,957 (EnergySage marketplace) | www.energysage.com |
| 200A panel upgrade | $1,800-$4,500; avg ~$2,500-$3,000 (secondary sources - mark estimate) Estimate | housemathguide.com |
| Plug-in transfer hardware | EcoFlow Smart Home Panel 2 $1,599; Anker Smart Home Power Kit $1,499 list; Jackery Smart Transfer Switch $1,299 list | homebatteryreport.com |
As of 2026-10-25. Heat pump and panel costs are included because a battery project often comes with a panel upgrade.
Installed battery or a big portable?
A large portable station plus a transfer kit can back up selected circuits for less money. For example, an EcoFlow DELTA Pro 3 ($2,799 sale) plus a Smart Home Panel 2 ($1,599) comes to $4,398 before electrician labor, which we don't have sourced data for. An installed battery switches over automatically and runs more circuits. Compare portables →
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FAQ
How much does a Tesla Powerwall 3 cost?
A comparison site lists the Powerwall 3 (13.5 kWh) equipment at $9,300, with installation extra (homegridhq.com, October 2026). EnergySage reports a typical installed cost of about $15,647 for a battery of about 13.5 kWh.
Is there a federal tax credit for home batteries in 2026?
No. The IRS says installations completed after 12/31/2025 are not eligible for the Section 25D credit.
Backup power, before the next outage
A short email when it matters: outage-season prep checklists before summer storms and winter freezes, state and utility rebates that open, change, or run out of money, and real price drops on the power stations in our data.