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Tesla Powerwall · Common problems & faults

Tesla Powerwall common problems & faults

STS engineers diagnose and repair 4 common problems & faults on Tesla Powerwall systems. Click any topic below for a full step-by-step guide, or book a free remote diagnostic and we'll tell you what the fix is. The WiFi is the exception: it's never remote work. If the WiFi still won't connect after the guide, we can set it up on site, from £195.
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I've spoken to Ron a couple of times with issues with my Givenergy installation. Such a friendly knowledge guy very highly recommended. Thank you very much for resolving my issues

michael fairhurst · May 2026 Google

I wholeheartedly recommend. Many thanks to Ron. Amazing. Everything is fixed. And I feel safer now that I know where to come for support if anything else happens. I contacted STS for help via their extremely useful website which told me exactly what I had done wrong to require support. My GivEnergy battery had been dead for a while and an attempted firmware update had stopped the inverter. The support was prompt and very professional and over and above what I expected. I was helped every step of the way with clear instructions and e-mail support for questions. The issue was resolved within 24 hours and a technical report produces from log data to share with Octopus to try to get to the bottom of how the original issue occurred. Despite Ron saying that mine was a familiar issue with Octopus Intelligent Flux, this to me was service over and above expectations.

Gary Mitchell · Nov 2026 Google

An amazing experience and service from Ronald - totally 100% recommend. All remotely sorted with no need to wait around for someone to pop in and sort. I was a little nervous about doing this but was really easy and he talks you through the steps. Just such relief and we are back up and running again.

Emma Fletcher · Oct 2026 Trustpilot

Ron was very knowledgeable and patient as we worked through the cause of Givenergy Hybrid Inverter suddenly failing (with 0W grid). He was able to quickly identify the probable cause, and point me in the right direction to identify the ‘burnt out’ AC isolator switch & piece of cable, which I was able to find a local electrician to replace. The best £95 I have spent. Thanks Ron.

Martin Smith · Aug 2026 Trustpilot

The Solar Tech Support company was the only one to respond to a request for someone to supply and fit a new inverter for our solar panels after our old one finally expired after 26 years. Ron kept us well informed throughout, came and ascertained that the issue was down to the inverter having failed then sourced and fitted a new one. He got the system up and running again, set up the wi-fi performance feedback and took away the old inverter for disposal. By acting promptly and fitting the job around existing commitments we were able to get our solar power unit back in operation with minimal delay in the short while before we were due to go away for a week. The work was carried out very professionally and we were asked to confirm that all was in order the following day. I was impressed that, having recently taken on additional work for GivEnergy customers we were able to keep our solar panel down-time to a minimum. I would highly recommend for prompt attention and first-rate service.

James Dignan · Aug 2026 Trustpilot

Brilliant. He fitted a new dongle and set the system up properly. Even better, he explained why the storage batteries don't work in a power cut - not correctly wired up - expensive to fix, but a simple turn of the master switch will give emergency power. He is the third technician to look at this issue and the only one to resolve it. Friendly and appoachable, comes when he says he will and reasonable charges. What's not to like!

GEOFFREY EADE · Jul 2026 Trustpilot

Last updated

What actually goes wrong with Tesla Powerwall systems

Most Powerwall faults we see are settings and metering problems, not a dead battery. The single most common is a CT clamp fitted backwards: the Gateway misreads solar or house load, so the battery won't charge from solar or sits full and exports when it should be running the house. Wrong operating mode and tariff windows that don't match your Octopus times cause most of the rest.

The Gateway is behind the other two themes. If it drops offline after a router change (Gateway 2 is 2.4GHz only, and port 1883 needs to be open) you lose app monitoring: the Powerwall usually keeps running, but the app can't show you a fault until the Gateway reconnects. In a power cut, circuits wired outside the Gateway or a contactor that fails to switch can leave a fully charged Powerwall doing nothing, and a backup reserve set too low leaves little in the tank when the grid drops.

Each guide below works through the checks in order, starting with what you can see in the Tesla app. If you get stuck on anything but the WiFi, the remote diagnostic is free, and we're independent of Tesla and your installer. WiFi isn't remote work: if the Gateway won't reconnect after our Gateway offline guide, we can set it up on site, from £195.

FAQ

Tesla Powerwall fault questions answered

Start with the energy flow screen in the Tesla app. If solar shows 0.0kW or a negative figure when the inverter is clearly generating, a CT clamp is very likely fitted backwards and the Gateway is misreading power flow. Then check the operating mode: Backup Only won't charge from solar, and a backup reserve set near 100% stops the battery discharging at all. On Powerwall 3, charging tops out at 5kW per unit, so export above that is normal.
Most of them, yes. Operating mode, backup reserve, Energy Exports, Grid Charging and Octopus tariff windows are all settings we can put right through the Tesla app. A Gateway that's dropped offline is usually a WiFi band or router firewall job: our Gateway offline guide has the checks, and if it won't reconnect, we can set it up on site, from £195. The other two that need hands on site are a reversed CT clamp, which an electrician rotates on the cable, and a faulty Gateway contactor, which is a hardware fault.
The remote diagnostic is free. Tell us your Powerwall model, what the Tesla app is showing and how long it's been happening, and we'll work out whether it's a settings problem, a wiring issue for an electrician, or a hardware fault for Tesla. If it's something we can fix remotely, the work is £125. If we can't fix it, you pay nothing. No fix, no fee.
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Need a Tesla Powerwall engineer?

Tell us what's happening with your Tesla Powerwall system. Free remote diagnostic, no-fix-no-fee. Most configuration faults resolved during the 30-minute session. We don't set up or diagnose WiFi remotely or over the phone: it's quicker and more reliable done on site.

  • No fix, no fee covers remote fixes. On-site work is quoted in writing before we start.
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