A Louisiana homeowner looking to expand a home battery backup setup got a jarring estimate when they were quoted $24,000 to add a Tesla Powerwall 3 to an existing Powerwall 2.
The homeowner took to Reddit's r/solar community to "get some opinions."
Here's what to know
The original poster explained: "I was looking at adding a PW3 to an existing PW2 system since they are now compatible. I was quoted at $24,000 which seems quite high to me, but I could be wrong."
Most replies in the Reddit thread treated that figure as unusually expensive.
The top comment read: "First off, $24,000 for a 13.5kwh powerwall3 is highway robbery. That's like $8,000-$10,000 high at California prices, and you're in Louisiana."
"Seems quite high because it is high," another user added.
A third commenter put it this way: "I would think no more than 10k. There's more to that price, like does a car come with it?"
Whether the two Powerwall generations can actually be paired became its own point of debate in the thread.
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One commenter initially insisted: "You [also] cannot integrate a powerwall3 into a powerwall2. They are not compatible."
The OP then linked to Tesla's Backward Compatibility page, and another commenter replied: "Check with your installers for detail[s]. Tesla released the training for this via the portal last month. There are limitations."
What can be done?
For homeowners considering a battery upgrade, the safest move is to always get multiple bids and ask for a fully itemized quote covering hardware, labor, permitting, and any electrical or gateway upgrades. It is also wise to ask installers to confirm in writing that the exact battery combination is supported for your system.
Still, battery storage is also one of the most practical upgrades for households that already have solar. It can help keep essential devices running during outages, store excess daytime solar power for later use, and reduce how much expensive electricity a household needs to draw from the grid.
Homeowners who want to compare options can explore EnergySage for information on home battery storage options, including competitive installation estimates, and EnergySage has teamed up with the electrification brand Qmerit to help guarantee you get the best price on home battery storage solutions.
For people who do not need a full Powerwall-style installation, Pila offers another strong backup option. Its plug-and-play batteries are priced at a fraction of what a whole-home backup system would cost, which could make them a better fit for renters or anyone who only needs to power a few essentials.
Where can I learn more?
For more context on Powerwall 3 and the broader home battery market, start with these stories. They cover the battery's features, its overseas rollout, and how quickly Powerwall installations are growing.
• Tesla confirmed several game-changing details about Powerwall 3, including a higher-power home energy design.
• Tesla started its European launch of Powerwall 3 in the U.K. and Germany.
• Tesla's home battery business passed half a million installations worldwide as Powerwall adoption kept climbing.
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