We are Tesla car people. We have run six Model Ys. We show up to install in a Model Y or a Model 3. We have passed two million kilometres fully electric. Tesla has sold a lot of cars because of us: referrals, and because customers saw what the car can charge like every time we arrived at their house. For us Tesla vehicles are the best on the market.
That is why this is harder to say. The car is one thing. The home battery is another. In 2026 there is no reason to buy one: it is expensive, slow to install, ships un-updated and depends on the internet for almost everything. And when it fails, Tesla Energy’s warranty is a disgrace. It does not match the price. It does not match Europe. It does not match the name on the car. That is why A Todo Sol is considering ending its collaboration with Tesla — Energy, not the cars.
What we have to say plainly
We do not recommend buying a Powerwall today. A customer paid for a premium product. Tesla admitted the factory fault. And offered a patch. A Tesla installer certificate is not an endorsement of the product.
Expensive, slow, tied to their cloud
A 13.5 kWh Powerwall 3, with Gateway and expansions, costs on the order of five times what you pay per useful kWh in the LiFePO₄ batteries we do install (Deye, Dyness, Felicity 16 kWh IP65). The premium is sold on the car brand. On site, the product is something else:
- Slow to install. It is not hang-it-and-done. Stale factory firmware, a long update, Tesla One, Gateway, comms, diagnostics. A Powerwall commissioning is a configuration session, not a torque job. A Deye hybrid, next to it, is a different trade.
- Without internet, there is almost no unit. Updates, logs, escalation, Job Check Out: all of it goes through Tesla’s cloud. On a finca or in a village with patchy coverage, the premium battery is an expensive cabinet until someone brings a 4G router.
- Obsolete on the 2026 market. Spanish homes have modular LFP, whole-house backup and spares that ship without turning every fault into a religion. Powerwall is still 13.5 kWh, NMC, expensive and tied to Tesla One.
If what you want is the logo in the plant room, this is the price of that logo. If what you want is the house to work, there are alternatives. What there is not is a warranty that lives up to that logo.
They admitted the factory fault. Then they asked for pictures of the roof
We have been certified Tesla Powerwall installers since 2023. We are not writing from a forum. We are writing from site and from a phone that nobody picks up.
In August we installed a new Powerwall 3 for a private customer in the Valencian Community. In September the unit failed. Arc fault. Defect. Diagnosis on site. Tesla support file: CI01EEB8CD.
On 16 September, Installer Support EMEA acknowledged an equipment fault with the photovoltaic array disconnected. That should have closed the argument: product defect, not A Todo Sol’s solar installation.
In the same thread, Tesla asked for the panels to be inspected with a thermal camera under load. Thermography of a roof that was no longer feeding the unit that was tripping. They admitted the factory fault. And then they asked us for thermal pictures of the roof.
The customer did not want a patch. He wanted it to work
The customer did not want a brand-new battery, at five times the price of another, “repaired” in pieces. He wanted replacement. A new unit. For it to work. Or for his European consumer rights to be honoured.
Tesla offered a limited RMA: patch the isolator. Repair in pieces. Delay. A Partner Portal that, when a certified installer opens it to see how that is supposed to work, loads blank:
In the European Union a manufacturer cannot impose a repair the consumer rejects when the goods are not in conformity. The spirit of Directive (EU) 2019/771 and of Spain’s consumer code is simple: an effective remedy, in a reasonable time, without stalling until the customer gives up. Tesla chose the protocol. The protocol chose the patch.
With Deye, Dyness, Felicity or Pylontech, if the unit is born wrong, the unit is changed. With Tesla, the installer plays free laboratory and the customer is left with a premium battery down. At five times the price, that is not a serious product. It is a channel we cannot defend in front of you. It is a warranty policy that should embarrass the people who wrote it.
On 26 September we changed it ourselves
We did not wait any longer for useless protocols. On 26 September, on our own authority, A Todo Sol replaced the defective Powerwall 3 with a new unit.
The new unit worked immediately. System up. Solar charging the battery. The roof, suddenly, was no longer the suspect.
While Tesla filled the Partner Portal with nothing, we changed the battery. We are not the free laboratory of a manufacturer that charges a premium and answers with bureaucracy. The installer prevented a commercial disaster Tesla’s delay almost caused. The customer has a working house because someone in the field did what the warranty should have done the day after the fault was admitted.
Elon: this is not how you defend Europe
Elon Musk:
You sell a car that changes how people drive. You also sell a home battery that, when it is born wrong, does not get replaced. It gets patched. It gets delayed. The roof gets blamed.
Your own support admitted the factory fault with the PV disconnected. The next move was to ask for thermal pictures of the panels. That is not engineering. It is a protocol that treats the European installer as the default suspect and the customer as someone who can be made to wait.
The customer paid for a premium product. He got a third-rate warranty. We — certified installers who have sold Teslas with every house call — put in the replacement unit and did the work your warranty should have done on its own.
If this reaches your desk, the question is one: is this how you defend Europe?
Change it. A Powerwall that fails from the factory gets replaced. Full stop. The rest — thermography, isolators, blank portals — is a disgrace wearing a Tesla logo.
So we say it without anaesthetic: A Todo Sol is considering ending its collaboration with Tesla because of that technical support and because of a warranty policy that does not deserve the name. There is no commercial sense in pushing a product that, when it fails, leaves both customer and installer hanging.
What we do install
Deye, Dyness and Felicity 16 kWh IP65. LiFePO₄. Whole-house backup. Market price. If the unit is born wrong, the unit is changed. And the phone is picked up — Saturdays and Sundays too.
If you already have a Powerwall
This is not us walking away from you. If we installed it, we remain your contact: diagnosis, warranty, the fight with the manufacturer. The article is about not selling another battery we cannot defend. Anyone who already has one is not left alone between a Tesla voicemail and a blank portal.
Close
Compare kWh, compare SAT, compare what happens the day the unit trips. The decent answer fits in one sentence: you change the battery. If the brand cannot say that, do not buy it. For now, we will not recommend it.
The cars are still the best on the market. The home-battery warranty is not. Any Tesla executive who reads this should ask whether this is how Europe is supposed to be defended.
→ Batteries we do install · WhatsApp 692 22 97 13 · how brand SAT can break the brand
A Todo Sol Instalaciones Fotovoltaicas SL, certified Tesla Powerwall installer. 27 September 2026. Customer and serial numbers omitted. Update of the article published on 18 September, after the autonomous replacement on 26 September. Not a substitute for an individual claim.