One Tesla owner, checking the company's app during a thunderstorm, encountered exactly the kind of scenario that home backup buyers hope to avoid.
While the grid was already down and the house's battery backup was draining, their car still appeared to be charging.
Here's what to know
In a thread posted to Reddit's r/TeslaSolar community, the homeowner reported that the app showed the Powerwall at 28% while the EV was still pulling power during the grid outage.
This original poster wrote, "Just noticed [the] grid is out and terrible Tesla power wall notification… Tesla really needs to sort out their notification priority when there is a grid outage… There needs to be a way to stop car charging if Tesla is on back up, or prioritize back up before charging a car if [the] grid is out."
The post also said the app was projecting less than 2 hours of backup despite roughly 27 kilowatt-hours of total storage and a household demand of about 0.5 kilowatts.
Commenters responded with their solutions. One wrote, "As long as your EV is a Tesla, you can set how much of the battery your car will use to charge when you're offgrid."
Another shared OP's sentiments, writing, "Agreed. I would love to tell the system that vehicles cannot charge from the battery. What would help you in this case is setup the charge from solar on your model Y."
More background
Many buyers assume a battery backup system will automatically prioritize essential household needs, but device settings, vehicle charging schedules, backup reserve rules, and app alerts can all shape what happens when the grid fails.
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Still, adding battery storage is one of the best ways to protect your home during outages, save on energy costs, and go off-grid. Homeowners who want to compare options can explore EnergySage for information about home battery storage systems, including competitive installation estimates.
EnergySage has teamed up with the electrification brand Qmerit to guarantee you get the best price on home battery storage solutions. Another option is Pila, whose plug-and-play batteries cost a fraction of what a whole-home backup system would.
Where can I learn more?
These articles stay focused on the same issue raised by the outage complaint: how Tesla Powerwalls perform when the grid goes down, and how homeowners are weighing them against newer backup options. They also get into the practical details that can decide whether stored power lasts through an emergency or runs short.
• Tesla markets a Powerwall that can save your family from ever-increasing outages.
• Homeowners are avoiding Tesla's once-dominant backup tech as next-generation batteries gain ground.
• In California, a Tesla virtual power plant earned a homeowner $600 through their Powerwall.
If you're counting on a battery system during severe weather, these stories offer a clearer sense of what to expect in practice. They also give useful context for comparing Tesla's setup with the rest of the backup market before the next outage hits.
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