While buying a pre-owned Tesla Powerwall 3 at a steep discount can be tempting, it can also come with significant risks.
One homeowner turned to the internet for advice about just such an opportunity, and commenters warned that the "bargain" could end up costing more in the long run.
Here's what to know
Posting on the r/Powerwall subreddit, the homeowner asked the community for their opinion on a unique chance to get a Tesla home battery for a fraction of the typical price.
"I've got the option to purchase an unwanted Powerwall 3 at a significant discount (but with no gateway)," they wrote. "I know I wouldn't have Tesla warranty etc but would it still be worth paying for the install and gateway?"
The original poster further explained that they already have home solar in place, making a home battery the perfect complement to their existing system.
"I already have 10K solar, 2 inverters and 2 phase power," the OP said.
In the replies, many commenters urged the homeowner to exercise caution, warning that what seems like a money-saving opportunity up-front could ultimately be a costly mistake.
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More background
As for the OP, many commenters viewed the lack of a battery warranty as the biggest concern.
"These units are not very serviceable. So if something goes wrong, it'll be a replacement," wrote one commenter.
"With no warranty it could die the first week and you would be out whatever you paid," said another.
Other Redditors questioned whether the battery would even be operable if installed at the OP's house.
"Make sure at the very least you see a proof of purchase from original owner," cautioned one commenter. "If it 'fell off the back of the truck' Tesla is likely going to brick/disable them."
The missing gateway was another sticking point.
"The gateway is what makes the whole thing work - I am not sure you could isolate (island) your home without a gateway," advised one commenter.
When installed correctly, battery storage can be a powerful money-saving tool, particularly when paired with solar panels and energy-efficient electric appliances like heat pumps and induction stoves. By storing solar energy for later use, batteries can reduce a home's reliance on grid electricity after the sun goes down.
What can be done?
Before paying for the used Powerwall 3, commenters said the OP should verify the proof of purchase, serial number, warranty status, and installer requirements. One commenter shared that buyers can confirm whether a warranty is active by calling Tesla and sharing the serial number.
Additionally, comparing the used system's total cost to new alternatives can make the financial tradeoffs clearer. After adding gateway hardware, professional installation, and the possibility of replacing a failed unit, the expected savings could soon vanish.
In the end, many Redditors argued that the long-term risk was not worth any up-front savings.
"Warranty is worth the extra money," one commenter wrote.
Where can I learn more?
For more on Tesla's Powerwall 3, check out the following stories. They cover the battery's new features, durability claims, international rollout, competing systems, and owner tools.
• Tesla confirmed several game-changing details about Powerwall 3, including a built-in solar inverter.
• Tesla fueled buzz with its new 'unstoppable' Powerwall shown operating even in water.
• Tesla reached its first European launch for Powerwall 3 in the U.K. and Germany.
• EcoFlow says Ocean Pro offers genuine advantages over Tesla's Powerwall 3 for home backup.
• Tesla's app update adds a game-changing feature that helps Powerwall owners track energy use.
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