Tesla has introduced a Go Off-Grid mode for its Powerwall home battery, allowing owners to simulate a power outage at home, according to an account published on 20 January 2022 by installer Spirit Energy1. The feature arrived alongside news that Powerwall is now suitable for off-grid installations1.
In the Tesla app, after pairing a phone with the battery, a button opens the relay in the Backup Gateway and disconnects the house from the grid until the owner chooses to reconnect1. Powerwall reconnects automatically if it runs out of energy or if demand exceeds what it can supply1. The battery can supply a maximum of 5kW of continuous power, so the mode can help identify heavy loads that might need limiting during a power cut1. Owners with a Tesla vehicle can also allow off-grid charging from Powerwall, using a chosen threshold to limit the power shared to the car1.
"Tesla has introduced the 'Go Off-Grid' mode for Powerwall, which allows you to simulate a power outage in your home"
The off-grid suitability claim sits alongside an existing island microgrid example. The Isle of Eigg in Scotland was the first remote community to develop a dedicated island microgrid, with residents switching on a new electricity network in 20081. That network is powered by solar, wind and hydro, with backup from batteries and diesel generators, and around 95% of the island's power comes from renewable sources1. Demand there is managed by limiting properties to 5kW for domestic use or 10kW for commercial use1. The Isle of Eigg Brewery was later established in a new building powered by solar PV and Tesla Powerwalls, described as the first off-grid Powerwall system in Europe1.
Spirit Energy's account states that living off-grid with solar and Powerwall is very tricky and expensive to achieve, arguing that a diesel generator is essentially needed because solar generation is skewed towards summer while demand is highest in winter1. It adds that the alternative, massively oversizing solar and battery capacity, leads to wastage of about 80% in summer1. No pricing for Powerwall or for the Go Off-Grid mode appears in the account1.
Why it matters for households
For a home already running a Tesla Powerwall, the mode turns a rare event into something that can be rehearsed. A household can see how long stored energy lasts under its own patterns of use, and which appliances draw the most, before a real outage happens. That is a step towards understanding a home's energy independence in practice rather than in theory, though the 5kW continuous limit means the battery cannot carry every load at once1.
The off-grid suitability claim is narrower than it may sound. The account describes genuine off-grid battery systems as difficult and costly, typically needing a diesel generator or heavily oversized solar and battery capacity with large summer wastage1. For most connected homes, the practical effect is backup and testing rather than disconnecting from the electricity grid. Details of which Powerwall models or software versions support off-grid installation have not been reported1.
What happens next
No dated next steps are given in the account1.
Sources1 cited
- Taking Tesla Powerwall Off-Grid, blog.spiritenergy.co.uk