Pila made backup power a plug-in appliance so renters could adopt batteries

Home batteries come in two flavors: cheap portable units for emergencies, and smart whole-home systems such as the Tesla Powerwall that cost $12,000–$16,000 installed and need an electrician, panel work, permitting and utility interconnection. The vast majority of Powerwalls sit in owner-occupied single-family homes; renters and apartment dwellers are largely locked out of backup power entirely.

Pila's CEO Cole Ashman came at the problem from both sides: he engineered Powerwalls at Tesla and worked at smart-panel startup Span, and he grew up in New Orleans, where post-Katrina outages left thousands of refrigerators on curbs after food spoiled. As a renter in New York he could not install the kind of system he had helped build, so he designed a "permissionless" one: a briefcase-sized 1.6 kWh lithium-iron-phosphate battery that plugs into a standard 120V outlet, carries its own outlets for the appliances it protects, and switches to battery in about 20 milliseconds when the grid dies.

The design deliberately keeps power flowing one way — charging from the socket, discharging only into appliances plugged into the unit — so the battery is legally an appliance rather than a grid device and needs no permit. Units form a 900MHz mesh with Wi-Fi and cellular fallbacks; the app shifts charging into cheap or solar hours, monitors the fridge with wireless sensors, and an expansion pack doubles capacity to 3.2kWh. Coverage is per room, so customers start with one unit and add more as needs and budgets grow.

The unit debuted at SXSW in March 2025 and drew a 301-point Show HN thread; by October 2025 Pila had raised a $4 million seed round led by R7 Partners with Toyota Ventures, Refactor Capital and GS Futures, with first deliveries planned for early 2026. The trade-off is explicit: without backfeed it backs up the appliances plugged into it, not 240V whole-house loads, although the hardware is bidirectional-ready for when US rules allow outlet-level backfeed.

Treat the standard 120V outlet as the installation: plug in, mesh room to room, no permit needed

Turning the install into a plug converts adoption from a regulated construction project into a purchase, so renters and multifamily households can buy backup power without owning the building.

Charging from the socket and discharging only into attached appliances keeps the unit on the appliance side of US electrical codes, so no permit or interconnection is needed today.

An entry price around $1,299 (with a $999 early-access tier) is roughly a tenth of an installed Powerwall, and mesh networking lets a household grow the system one plug-in room at a time.

Because each unit earns value daily — time-of-use arbitrage, solar charging, fridge and outage intelligence — it is not idle insurance that only matters when the grid fails.

The hardware is bidirectional-capable and software-updatable, so as state rules such as Utah's plug-in backfeed law spread, the same units can start serving the grid.

When the barrier to a category is the installation, redesign the product around infrastructure that already exists — the wall outlet — so adoption stops being a construction project.

The Pila Mesh debuted at SXSW in March 2025; its Show HN post drew 301 points and 480 comments and offered $999 early-access pricing. Canary Media covered the launch in October 2025 alongside the $4 million seed led by R7 Partners with Toyota Ventures, Refactor Capital and GS Futures; pv magazine profiled the unit at CES 2026, and first deliveries were planned from early 2026. Coverage called it a "fractional Powerwall" in a DIY balcony-solar wave, while noting the limit the company concedes: US codes bar outlet backfeed today, so 240V whole-house loads still need a hardwired system.