A remote software update is supposed to improve a smart home energy system, not sideline part of it. But one Tesla Powerwall owner says a firmware push did exactly that, taking one of two batteries offline and leaving the homeowner with an installer bill.
Here's what to know
In a Reddit thread, a homeowner described an issue in a 15-month-old solar setup built around two Powerwall 3s. They said the system had been operating smoothly, but a remote update hit the follower battery before the lead unit, which allegedly knocked the follower offline.
The explanation reportedly surfaced only after the homeowner paid for a third-party installer to visit the site: the original poster said the outage was blamed on the firmware rollout, and that updating the lead Powerwall should bring the system back.
Before that, Tesla support had spent about 30 minutes troubleshooting without disclosing any firmware change, according to the owner, who wrote, "Even though I worked with Tesla for 30 minutes they never mentioned they had made a firmware change."
The system reportedly returned to normal after about two weeks of downtime.
The OP also argued that support should have started by identifying recent changes, saying, "As a long time IT person I suggested the first step of troubleshooting is 'what changes were made'." The homeowner further said, "I was denied compensation and told the Powerwall warranty doesn't cover loss of product or a site visit."
Other owners in the thread described similar problems. One commenter wrote, "Ditto! I've had both my powerwalls down all day and no solar. Reported to Tesla and they are investigating."
More background
Adding battery storage can be one of the best ways to keep critical appliances running during blackouts, store extra solar power for later use, and help households avoid higher electricity prices during peak demand.
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Elsewhere in the thread, the homeowner relayed what Tesla support had reportedly told them about the mismatch: when two firmware versions are involved, the lead Powerwall was said to need the newer software first. In the poster's telling, the follower was updated before the lead unit, which took it offline.
What can be done?
Find out whether firmware updates can be scheduled, what happens if one battery in a multi-unit setup fails after an update, whether your installer charges for troubleshooting visits, and what reimbursement policies apply if a manufacturer-triggered change causes downtime.
The OP concluded, "Maybe this is just a warning about Tesla Powerwall upgrades in multi Powerwall installations."
Where can I learn more?
For more context on Tesla's home batteries, these stories look at software updates, outage performance, and the company's expansion.
• Tesla rolled out a game-changing Powerwall meter in its app for sharper home-energy tracking.
• During an outage, a homeowner said the whole neighborhood was out, but their Powerwall stayed on.
• Tesla confirmed new Powerwall 3 details, including hardware changes and a possible feature boost.
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