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Who Controls the Battery in Your Driveway?

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Who Controls the Battery in Your Driveway?

Tesla brought home power backup to America. In Australia, an update is switching it off. North American owners just got Powershare with Powerwall. Australian owners of existing Teslas got a software update that appears to block the third-party gear they use to power their homes. It is a test case for who really controls the battery in your driveway.

Mark Purcell is an electrical engineer and energy advocate based in Noosa Heads, Queensland, Australia. He owns two Teslas and a bidirectional DC charger, and has been a member of the Australian Electric Vehicle Association since 2022. He has contributed content to CleanTechnica previously.

On 12 October, my Model Y ran my house. Through a Sigenergy bidirectional DC charger in my garage on Australia’s Sunshine Coast, it supplied about 25 kW to my home. The battery in my driveway holds several times the energy of a typical home battery, and I have already paid for it.

That may not last. 38 branch, rolling out since October, cuts third-party discharge within minutes. On the Tesla Motors Club forum, owners describe power stopping after about three minutes with a battery management alert, or after 15 to 20 minutes whatever the load. The old Camp Mode and Service Mode workarounds no longer help. Drive Tesla Canada has covered the reports. EleJoy, Tlyard and Sigenergy users are all affected, and Tlyard now warns customers that Tesla’s 2026 software detects “simulated charging” and may cut the power link.



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