BioLite Backup makes sense if your outage plan starts with the refrigerator and a few selected appliances. It is not a whole-home system. In a home breaker test, WIRED reviewer Christopher Null reported immediate switchover with Backup Complete; his estimate of about 18 hours applied to that two-unit setup and a refrigerator drawing an average 170 W.
What BioLite Backup is designed to cover
Backup Core plugs into a standard 120 V wall outlet, and selected appliances plug into the system. BioLite says it passes grid power through during normal operation and automatically switches connected loads to battery power when the grid fails. The company positions Backup for critical appliances and rooms, rather than an entire home. BioLite’s product page
Core is the system’s main unit, with the inverter, controls, grid input and AC outlets. Backup Extend adds battery capacity but cannot run by itself; it must connect to Core. BioLite says one Core can support up to six Extends, for a maximum listed capacity of 10.5 kWh. BioLite’s explanation of Core and Extend BioLite’s capacity guide
What the refrigerator test says about runtime
Null reported immediate switching when he tripped the circuit breaker during his test of Backup Complete. He estimated about 18 hours for the two-unit setup, based on an average refrigerator draw of 170 W. That estimate belongs to his tested configuration and load; refrigerator efficiency and other connected appliances affect runtime.
BioLite’s own estimates are 15 to 30 hours for Core and 30 to 60 hours for Complete, depending on the refrigerator and connected load. Those are company estimates, while Null’s 18-hour figure is a reviewer’s estimate from one specific setup. BioLite’s listed capacities and runtime estimates
Appliance power does not depend on the router
BioLite reports that a refrigerator and a sump pump switched over automatically during two 15-minute outages, even though the home routers were not connected to Backup. The company describes Wi-Fi or nearby Bluetooth as ways to communicate with its app; remote status updates require connectivity. This separates the battery’s reported local power switching from monitoring it through the app. BioLite’s outage account
Mounting, app scheduling and recharge
Null said mounting his two-unit setup took about 90 minutes. His installation involved a cramped refrigerator alcove and a clearance mistake with the bracket template. BioLite also describes flat placement on top of a refrigerator as an option. In the app, Null found basic scheduling and a sparse usage log; he said it lacked multiple on/off periods in one day and seasonal schedules.
BioLite estimates that Core recharges in about 2.5 hours from a standard 15 A wall outlet. High pass-through loads can extend the charging time. BioLite’s recharge guidance
U.S. configurations and listed prices
BioLite’s U.S. product page listed these prices on November 2, 2026:
| Configuration | Listed capacity | Components | U.S. listed price |
| Backup Core | 1.5 kWh | Core | $1,999 |
| Backup Complete | 3.0 kWh | Core plus Extend | $3,499 |
Complete adds 1.5 kWh over Core for $1,500 more at those listed prices. That extra reserve is useful if your refrigerator and other connected loads need longer coverage; Extend must remain connected to Core. BioLite’s U.S. product listing
For refrigerator-focused outages, Core is the lower-cost entry point and Complete offers more battery capacity. If you need backup across a broader set of home circuits, a professionally installed whole-home system is a different fit.
