{"id":9611,"date":"2017-03-02T19:08:12","date_gmt":"2017-03-02T08:38:12","guid":{"rendered":"https:\/\/www.solarquotes.com.au\/blog\/?p=9611"},"modified":"2026-02-05T15:50:48","modified_gmt":"2026-02-05T06:20:48","slug":"tesla-kills-off-dc-powerwall-2-ac-version-delayed","status":"publish","type":"post","link":"https:\/\/www.solarquotes.com.au\/blog\/tesla-kills-off-dc-powerwall-2-ac-version-delayed\/","title":{"rendered":"Tesla Kills Off DC Powerwall 2. AC Powerwall Delayed"},"content":{"rendered":"
\"powerwall

DC’s not pinin! DC’s passed on! This battery system is no more! DC has ceased to be! It has expired and gone to meet its maker! DC’s kicked the bucket! DC has shuffled off its Tesla coil, run down the charge, and joined the bleedin’ choir invisible! THIS IS AN EX-BATTERY!<\/p><\/div>\n

I was just relaxing by listening to the musical version of the Massacre of Mankind<\/a> when I suddenly got some news from the solar grapevine1<\/a><\/sup> concerning the Tesla Powerwall 2.\u00a0 To cut a short story even shorter:<\/p>\n

The DC version of the Powerwall 2 is dead!<\/p>\n

Long live the AC version!<\/p>\n

If it ever gets here!<\/p><\/blockquote>\n

<\/p>\n

In response, I immediately leapt on the Adelaide internet and started furiously tugging on the string that sends ones and zeros to contact my contact at Tesla, who immediately replied, but insisted on remaining an unnamed source.\u00a0 So for now I’ll just call him Secret Sauce, which at least is a better name than Deep Throat<\/a>.<\/p>\n

Tesla’s Unofficial Response<\/h2>\n

His (or her) response was the following:<\/p>\n

Tesla is committed to the development of industry-leading technology and ensuring we always provide our customers with the best products possible. The AC Powerwall includes a Tesla built-in inverter, offering customers the greatest value, flexibility, and ease of installation, regardless of whether they\u2019re pairing Powerwall with new solar, retrofitting, or using the Powerwall for backup. As a result, we will no longer be offering the DC Powerwall, which was the same price and size of the AC Powerwall but did not include an inverter.<\/p>\n

 <\/p>\n

When Tesla originally launched Powerwall 2, we announced we would offer an AC Powerwall and a DC Powerwall. Both variants cost $8,000 and are identical in size. The only difference is that the AC Powerwall included a built-in inverter, offering customers the greatest flexibility for retrofits, standalone, back-up, or new solar without the need for an external, compatible inverter. The DC Powerwall would only be used for customers who already had an existing compatible inverter and therefore didn\u2019t need an integrated inverter.<\/p><\/blockquote>\n

So, Tesla is committed to ensuring they provide customers with the best products possible.\u00a0 But not ones they’ve actually promised to deliver.\u00a0 Because apparently the AC version is superior.<\/p>\n

You know, if the AC version of the Powerwall 2 is so much better than the DC version, you’d think they could have worked that out before they started taking people’s money, wouldn’t you?<\/p>\n

The real reason for having both an AC and a DC version is they are two quite different things.\u00a0 If I wanted to add on-grid battery storage to a home then the AC version of the Powerwall 2 should be an easy way to do that.\u00a0 But if I wanted on off-grid installation I would use the DC version of the Powerwall 2 along with a compatible multimode<\/a> (hybrid) inverter.<\/p>\n

But even for an on-grid installation there are good reasons for wanting a DC version.\u00a0 For one thing, DC coupling<\/a> batteries can result in higher efficiency and lower losses than AC coupling<\/a>.\u00a0 It can also simplify monitoring the system.\u00a0 And another reason could be avoiding red tape from electricity distributors.<\/p>\n

Update:\u00a0<\/strong>Tesla have advised that full monitoring of the battery and solar power system via a Tesla app can be achieved with an additional “Tesla Gateway”. No word on the price. From what I can tell, it will need to use current transformers to monitor the solar and consumption on non-compatible solar inverters.<\/p>\n

Network Operators Could Prohibit The AC Powerwall 2<\/h2>\n

Many Australian households are limited to installing a 5 kilowatt solar inverter2<\/a><\/sup>, or a total of 5 kilowatts of smaller inverters.\u00a0 It is possible that your electricity network operators could declare that the inverter in the AC Powerwall 2 counts towards any maximum\u00a0solar inverter size and so effectively prohibit it for most households, as they would be forced to choose between having rooftop solar or an AC Powerwall, as it has a 5 kilowatt inverter.<\/p>\n

Counting a battery inverter as adding to solar inverter capacity is completely nuts as it does nothing to increase the output of the solar power system it is attached to and battery systems improve the operation of the grid, so I don’t believe this will be done.\u00a0 But, I also didn’t believe Trump would become President, so what do I know?\u00a0 People could definitely prefer to have a DC Powerwall 2 rather than an AC one in order to be safe rather than sorry.<\/p>\n

The AC Version Will Allow ‘Full Home Backup’<\/h2>\n

Secret Sauce still stands by Tesla’s claim that:<\/p>\n

“The AC Powerwall will provide full home backup<\/em>“.<\/p>\n

Just please be aware that\u00a0‘full home backup’ is a very different proposition to ‘operating off grid’.<\/p>\n

Households, Installers, And Inverter Makers Stiffed\u00a0By Tesla<\/h2>\n

The DC version of the Powerwall 2 was not just a vague idea of Tesla’s floating around in Platonic battery space.\u00a0 It was an announced product that they said they were going to make.\u00a0 I even had my picture taken next to a big hollow Powerwall 2 case they put on display.\u00a0 (I can tell you, I am taking the poster I had made of that down off my bedroom wall.\u00a0 I don’t care how arousing the wife finds batteries.)\u00a0 They produced datasheets, gave prices, and took deposits on god knows how many thousands of units.<\/p>\n

The people who paid those deposits are quite justified in clenching their fists and growling between their teeth, “We had a deal, Tesla!”<\/p>\n

I am certain the home owners who paid deposits will get their money back.\u00a0 Either that, or Tesla will manage to convince them to switch to AC versions.\u00a0 So they will get off lightly.\u00a0 But some people have been screwed so severely by this they may end up looking like a walking mass of Phillip’s heads.<\/p>\n

Firstly, there are the people who paid to install a StorEdge multimode inverter<\/a> which was compatible with the now non-existent DC Powerwall 2.\u00a0 There are installers who paid for StorEdge inverters\u00a0who will now have stock people are unlikely to want.\u00a0 In addition, they also paid for training on how to install them.\u00a0 And then there is the SolarEdge company itself, which has made a line of inverters that are basically meant for use with DC Powerwalls.\u00a0 I bet they’re not happy about this at all.\u00a0 It will be interesting to see how much their stock<\/a> will have dipped by the end of trading tomorrow.<\/p>\n

What You Can Do<\/h2>\n

If you have put a deposit down on a DC Powerwall 2 you can ask for your money back.\u00a0 And if you’ve put down money for an AC Powerwall 2 you could ask for your money back if you no longer think Tesla is a company you can trust to deliver what they say they will.<\/p>\n

If you have installed a StorEdge inverter in preparation for getting a Powerwall, don’t panic too much.\u00a0 LG Chem produces the RES7H and RESU10H<\/a> with 6.6 and 9.3 kilowatt-hours of usable storage which are compatible with it.\u00a0 I’m afraid there may not be any other battery systems that are compatible on account of how the voltage range Tesla Powerwalls operate at is a bit odd.<\/p>\n

You could also get an AC Powerwall 2 and AC couple it to your home.\u00a0 This means your fancy and expensive StorEdge inverter will just act as a plain old ordinary one and won’t have anything to do with the functioning of the Powerwall 2.\u00a0 I do not think this option would be suitable for off-grid use.<\/p>\n

If you are an installer who has bought a heap of StorEdges you now no longer need, I guess you could try to convince people how great the higher voltage LG Chem RESUs are.<\/p>\n

And if you are SolarEdge, the company that makes StorEdges, then I don’t really know what you can do.\u00a0 But I can tell you you definitely should not hire Ninjas to wreak revenge upon Tesla.\u00a0 Because that would be wrong.\u00a0 Also, revenge will leave you feeling hollow inside, just like an empty Powerwall 2 display case.<\/p>\n

AC Version Delayed<\/h2>\n

Tesla are now promising\u00a0the first Australian customer installs will be in late April3<\/a><\/sup> – 2 months later than originally promised.<\/p>\n

What The Hell Is Going On?<\/h2>\n

So why did Tesla cancel the DC version of the Powerwall 2?\u00a0 I’m afraid I just don’t know.\u00a0 But if I were the kind of person who speculates wildly, and I am, I would guess Tesla simply bit off more than they could chew.<\/p>\n

If they can get the AC version to work there is potentially a huge market for AC coupled battery storage.\u00a0 I think they decided to concentrate on that, saw the DC version as a distraction, and so threw it under the bus and and walked away, turning their backs on everyone who gets hurt as a result.<\/p>\n

But don’t listen to me, I don’t know anything.\u00a0 Go bother Elon Musk for the true story.\u00a0 If he knows it himself.<\/p>\n","protected":false},"excerpt":{"rendered":"

I was just relaxing by listening to the musical version of the Massacre of Mankind when I suddenly got some news from the solar grapevine1 concerning the Tesla Powerwall 2.\u00a0 To cut a short story even shorter: The DC version of the Powerwall 2 is dead! Long live the AC version! If it ever gets […]<\/p>\n","protected":false},"author":10,"featured_media":9640,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":true,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[551],"tags":[578,572,552],"class_list":["post-9611","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-battery-storage","tag-powerwall","tag-solaredge","tag-tesla","entry"],"acf":[],"yoast_head":"\nTesla Kills Off DC Powerwall 2. AC Powerwall Delayed - SolarQuotes Blog<\/title>\n<meta name=\"description\" content=\"The DC Powerwall 2 is no more! DC has ceased to be! It has expired and gone to meet its maker! DC's kicked the bucket! 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My February summary of the Powerwall 3's expected specs contained several 'to be confirmed' speculations. 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