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Diagnostic guide · Tesla Powerwall

Tesla Gateway or app offline?

Your Powerwall still works without internet, but you have lost app monitoring and remote control. The issue is usually WiFi band mismatch, router firewall port 1883 blocked, or Gateway lost network credentials. Follow these 6 diagnostic steps for Gateway 2 and Gateway 3.
  • Powerwall 2 and Powerwall 3
  • Free remote-first diagnostic · no fix, no fee
  • Not affiliated with Tesla
Gateway offline, but Powerwall works?

Tell us your Gateway model, WiFi band (2.4GHz or 5GHz), whether you changed routers recently, and what LED colour you see. We diagnose your Gateway connection and firewall settings remotely.

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Independent — not affiliated with Tesla Inc.

5.0
13 Trustpilot reviews
Trustpilot Google

I have a GivEnergy system consisting of two batteries, two inverters and a controlling EMS (Energy Management System) which has not worked since Nov 2025. After six months I discovered Solar Tech Support, reached out to them and Ron phoned me back – how often do you get that service? Could not be more helpful – worked directly with me over the phone, outside what I would call normal working hours. Lucid explanations and we were able to discuss the issues and history using camera and email history. As this was a very rare setup, Ron was able to access an EMS expert in the field to confirm the solution. One sunny day in, I am now only paying for standing charge and a few pence for spikes in grid consumption while battery catches up with house demand.

Ian · May 2026 Trustpilot

When my GivEnergy system had an issue, I was completely left without support and had honestly lost all hope. Thankfully, I searched online and found Ron, which completely turned things around. After sending him a message, he responded incredibly fast and called me to assure me that he would get the problem fixed. I really admire his dedicated, supportive nature and his determination to find a solution. With this kind of outstanding attitude and customer service, he has absolutely secured a future customer in me.

Sree · May 2026 Trustpilot

Ron want out of is way to help, nothing was to much. He was very thorough in what he did Very knowledgeable I would highly recommend Ron and his company He did a fantastic job for me. if you have any problems, he'll do his best to help you out and resolve your problem. I wouldn't hesitate to recommend them

Dennis Brown · May 2026 Trustpilot

Ron took me through a diagnostic to confirm my GivEnergy Inverter had a fault. A common one as it turns out with the AC Inverter. As GivEnergy is defunct there is no immediate fix, aside from sourcing 2nd hand replacement. It may be that a fix becomes available over the summer which would make a lot of GivEnergy customers happy (Again)

Tony Deacon · May 2026 Trustpilot

Contacted Ron with a problem and he sorted it out quickly with no problems at all. Very knowledgeable on anything solar/ batteries. I would recommend him to anyone

Phill · May 2026 Trustpilot

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 Trustpilot

Contacted Solar Tech Support in desperation. After explaining the issues I had with my system a diagnosis was made and a solution proposed. Fantastic service, even contacted a manufacturer to arrange replacement parts for me. Great communications, explained all they were doing and what I had to do, clearly and precisly. Followed up to confirm all was ok. Excellent service.

Mr Machin · May 2026 Trustpilot

After GivEnergy went into liquidation, just my luck, my battery started playing up (internal board crashed). Contacted my installer - not interested! Found Solar tech support on a Google search. Sooo glad I found this company! Ron is extremely helpful and has plenty of experience. He soon confirmed what the fault was, and helped me to get my system up and running again. Now moved my GivEnergy account to Solar tech support, and will definitely use again if I have more issues. Unusual to find such a helpful company in these times, no morons reading scripts, just direct contact with the engineer.

Keith Ballard · Apr 2026 Trustpilot

Contacted Solar Tech Support when trying to understand what my Givenergy inverter problem might be and what might be my options. Received good/honest advise which backed up my thoughts.

Hugh Speirs · Apr 2026 Trustpilot

Ron is a super star. Two months ago my GivEnergy battery failed a firmware upgrade leaving it a brick. My installer couldn't/wouldn't fix it. GivEnergy couldn't/wouldn't fix it. Then they went into administration and all hope was lost. A flurry of emails later and Ron had diagnosed the fault (failed USB flash drive, something I'd suspected) and talked me through resolving it. Two months of nothing resolved in about 3 hours. It's great to work with someone who pays attention to the details, knows that they're doing (not just following a script) and gets stuff sorted without a fuss or up-charging.

Christopher · Apr 2026 Trustpilot

I can add to the list of customers who had already 'given up' on GivEnergy due to their appalling customer service, and that was before they went into administration (their Trustpilot reviews don't lie!). So you can imagine my desperation when, having changed my ISP and my Inverter, predictably, proving to be the only device that didn't connect automatically to my new network, I found zero prospect of any customer support with GivEnergy having called in the administrators just five days earlier! The salvation came from Solar Tech Support. My IT advisor stumbled across their web site and some very helpful tips for beleaguered GivEnergy customers, as well as an offer to provide direct assistance. Nothing ventured, I decided to drop them an E-Mail, with very low expectations based on my experience of GivEnergy customer support. Within an hour Ron had responded with some pin point advice, and after a few exchanges of E-Mails he had nailed the problem, enabling the combined efforts of my IT advisor and solar installer to resolve it and reconnect my Inverter. Thank you Solar Tech Support, and Ron in particular, for coming to the aid of a deserted and despondent GivEnergy customer. Expert, razor sharp advice and first class customer service, even though I wasn't officially a customer.

customer · Apr 2026 Trustpilot

This company are a rare gem, I had a very unusual problem following a failed firmware upgrade on my GivEnergy kit. I then found out GivEnergy were in administration and had dismissed all their support staff! None of the usual fixes to try and restore my inverter comms would work, and I looked everywhere, forums, GivEnergy youtube support videos - even AI couldn't figure it out. My installer was talking about huge sums for system replacements, and being vague / evasive about if they'd even install replacement GivEnergy inverter. Enter Solar Tech Support, reassuring and knowledgeable from the very start, I've learnt loads about my solar system though the friendly chat while my engineer worked as he diagnosed the problem and figured out a fix procedure that I've not found anywhere else - amazing . If you need solar system repairs - especially if you like me have been left high and dry by GivEnergy, I cannot recommend this company enough. Give them a call.

Andy Thomas · Apr 2026 Trustpilot

I sent a message on their website regarding a problem I have on my Givenergy system. Although not supplied by Ronald, I thought it was worth an email. Within the hour on a Saturday, he phoned and we discussed the problem. He logged in remotely and gave excellent advice. I'm too far away for his on-site help but he did diagnose the problem and was happy also to chat through my thoughts about an upcoming solar/battery install I'm planning. Great bloke.... if only he was nearer!

Philip · Apr 2026 Trustpilot

I have a GivEnergy system consisting of two batteries, two inverters and a controlling EMS (Energy Management System) which has not worked since Nov 2025. After six months I discovered Solar Tech Support, reached out to them and Ron phoned me back – how often do you get that service? Could not be more helpful – worked directly with me over the phone, outside what I would call normal working hours. Lucid explanations and we were able to discuss the issues and history using camera and email history. As this was a very rare setup, Ron was able to access an EMS expert in the field to confirm the solution. One sunny day in, I am now only paying for standing charge and a few pence for spikes in grid consumption while battery catches up with house demand.

Ian · May 2026 Trustpilot

When my GivEnergy system had an issue, I was completely left without support and had honestly lost all hope. Thankfully, I searched online and found Ron, which completely turned things around. After sending him a message, he responded incredibly fast and called me to assure me that he would get the problem fixed. I really admire his dedicated, supportive nature and his determination to find a solution. With this kind of outstanding attitude and customer service, he has absolutely secured a future customer in me.

Sree · May 2026 Trustpilot

Ron want out of is way to help, nothing was to much. He was very thorough in what he did Very knowledgeable I would highly recommend Ron and his company He did a fantastic job for me. if you have any problems, he'll do his best to help you out and resolve your problem. I wouldn't hesitate to recommend them

Dennis Brown · May 2026 Trustpilot

Ron took me through a diagnostic to confirm my GivEnergy Inverter had a fault. A common one as it turns out with the AC Inverter. As GivEnergy is defunct there is no immediate fix, aside from sourcing 2nd hand replacement. It may be that a fix becomes available over the summer which would make a lot of GivEnergy customers happy (Again)

Tony Deacon · May 2026 Trustpilot

Contacted Ron with a problem and he sorted it out quickly with no problems at all. Very knowledgeable on anything solar/ batteries. I would recommend him to anyone

Phill · May 2026 Trustpilot

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 Trustpilot

Contacted Solar Tech Support in desperation. After explaining the issues I had with my system a diagnosis was made and a solution proposed. Fantastic service, even contacted a manufacturer to arrange replacement parts for me. Great communications, explained all they were doing and what I had to do, clearly and precisly. Followed up to confirm all was ok. Excellent service.

Mr Machin · May 2026 Trustpilot

After GivEnergy went into liquidation, just my luck, my battery started playing up (internal board crashed). Contacted my installer - not interested! Found Solar tech support on a Google search. Sooo glad I found this company! Ron is extremely helpful and has plenty of experience. He soon confirmed what the fault was, and helped me to get my system up and running again. Now moved my GivEnergy account to Solar tech support, and will definitely use again if I have more issues. Unusual to find such a helpful company in these times, no morons reading scripts, just direct contact with the engineer.

Keith Ballard · Apr 2026 Trustpilot

Contacted Solar Tech Support when trying to understand what my Givenergy inverter problem might be and what might be my options. Received good/honest advise which backed up my thoughts.

Hugh Speirs · Apr 2026 Trustpilot

Ron is a super star. Two months ago my GivEnergy battery failed a firmware upgrade leaving it a brick. My installer couldn't/wouldn't fix it. GivEnergy couldn't/wouldn't fix it. Then they went into administration and all hope was lost. A flurry of emails later and Ron had diagnosed the fault (failed USB flash drive, something I'd suspected) and talked me through resolving it. Two months of nothing resolved in about 3 hours. It's great to work with someone who pays attention to the details, knows that they're doing (not just following a script) and gets stuff sorted without a fuss or up-charging.

Christopher · Apr 2026 Trustpilot

I can add to the list of customers who had already 'given up' on GivEnergy due to their appalling customer service, and that was before they went into administration (their Trustpilot reviews don't lie!). So you can imagine my desperation when, having changed my ISP and my Inverter, predictably, proving to be the only device that didn't connect automatically to my new network, I found zero prospect of any customer support with GivEnergy having called in the administrators just five days earlier! The salvation came from Solar Tech Support. My IT advisor stumbled across their web site and some very helpful tips for beleaguered GivEnergy customers, as well as an offer to provide direct assistance. Nothing ventured, I decided to drop them an E-Mail, with very low expectations based on my experience of GivEnergy customer support. Within an hour Ron had responded with some pin point advice, and after a few exchanges of E-Mails he had nailed the problem, enabling the combined efforts of my IT advisor and solar installer to resolve it and reconnect my Inverter. Thank you Solar Tech Support, and Ron in particular, for coming to the aid of a deserted and despondent GivEnergy customer. Expert, razor sharp advice and first class customer service, even though I wasn't officially a customer.

customer · Apr 2026 Trustpilot

This company are a rare gem, I had a very unusual problem following a failed firmware upgrade on my GivEnergy kit. I then found out GivEnergy were in administration and had dismissed all their support staff! None of the usual fixes to try and restore my inverter comms would work, and I looked everywhere, forums, GivEnergy youtube support videos - even AI couldn't figure it out. My installer was talking about huge sums for system replacements, and being vague / evasive about if they'd even install replacement GivEnergy inverter. Enter Solar Tech Support, reassuring and knowledgeable from the very start, I've learnt loads about my solar system though the friendly chat while my engineer worked as he diagnosed the problem and figured out a fix procedure that I've not found anywhere else - amazing . If you need solar system repairs - especially if you like me have been left high and dry by GivEnergy, I cannot recommend this company enough. Give them a call.

Andy Thomas · Apr 2026 Trustpilot

I sent a message on their website regarding a problem I have on my Givenergy system. Although not supplied by Ronald, I thought it was worth an email. Within the hour on a Saturday, he phoned and we discussed the problem. He logged in remotely and gave excellent advice. I'm too far away for his on-site help but he did diagnose the problem and was happy also to chat through my thoughts about an upcoming solar/battery install I'm planning. Great bloke.... if only he was nearer!

Philip · Apr 2026 Trustpilot

⚡ Safety Warning

Do not open your inverter or interfere with DC cabling. Solar panels produce live DC voltage whenever exposed to light. Always use your DC isolator switch and contact a qualified solar engineer for hands-on fault diagnosis.

ℹ️
Before you start: your Powerwall battery continues to operate normally even when the Gateway is offline. You lose Tesla app monitoring, remote control, and server-side features like Storm Watch. But backup power, solar charging, and self-consumption all work as configured. The issue is just the communication bridge between your home and Tesla servers.
Diagnosis

Step-by-step Gateway offline diagnosis

Work through these steps in order. Step 1 checks the physical LED. Step 2 covers WiFi band compatibility — the most common cause. Steps 3–6 cover reconnection methods, Ethernet, firewall port rules, and power cycling.

1
Check the Gateway LED status

Look at the LED indicator on your physical Gateway unit. Solid green = connected and communicating with Powerwall. Flashing green = enabled but no communication with Powerwall — local connection issue. No light = no power to the Gateway — check your circuit breaker or wall outlet. On Gateway 3: green plus light blue = ready for initial commissioning. Flashing red = firmware update in progress — do not power off, wait for completion.

2
Check your WiFi network frequency band

This is the #1 cause of Gateway offline issues. Gateway 2 supports 2.4GHz ONLY — not 5GHz. If your router defaults to 5GHz-only or has merged 2.4/5GHz bands, the Gateway cannot connect. Gateway 3 supports both 2.4GHz and 5GHz. If you recently changed routers, your new router may have different default band settings. Check your router admin panel and ensure 2.4GHz is available and your Gateway is connecting to it. Also verify signal strength — minimum 2-3 bars required. If the Gateway is too far from the router, move it closer or add a WiFi repeater.

3
Reconnect WiFi via the Tesla app

Open the Tesla app and tap on your Powerwall. Go to Settings > WiFi. Select your home network and enter the password. Wait 2-3 minutes for the Gateway to reconnect to Tesla servers. If the Tesla app cannot reach your Gateway remotely, you can connect directly to the Gateway's local WiFi network: look for a network named TEG-xxx (where xxx is your unit's serial number, usually printed on the Gateway). Connect your phone to this network — no password required. Then open the Tesla app again — it will now see the local Gateway — and configure your home WiFi from there.

4
Check Ethernet connection if available

Tesla recommends configuring BOTH Ethernet and WiFi for maximum reliability. The Gateway will auto-select whichever connection is available and fastest. Use minimum CAT5 cable (CAT6 or CAT7 preferred). Verify the cable is fully seated in both the Gateway jack and your router port — push until you hear a click. If Ethernet still is not working, try connecting to a different port on your router — one port may be faulty. Inspect the cable for any visible damage or bent pins.

5
Check router firewall and port 1883

The Gateway uses the MQTT protocol on port 1883 to communicate with Tesla servers. Some routers block this port by default or after firmware updates. Log into your router admin panel and look for firewall rules or port blocking settings. Port 1883 must be open for outbound traffic. Also check if MAC address filtering is enabled — if it is, whitelist the Gateway's MAC address (usually printed on the unit or visible in the Tesla app). After any router firmware update or router change, power cycle both your router and the Gateway — turn them off for 30 seconds, then turn them back on.

6
Power cycle the Gateway

Turn off the Gateway circuit breaker, wait 30 seconds, turn it back on. Allow 5 minutes for the system to fully reconnect and sync with Tesla servers. The LED should change from offline (no light or flashing) to solid green when successfully connected. If still offline after 5 minutes, press the Gateway reset button for 1 second — this resets WiFi settings without erasing your Powerwall configuration or historical data. Your Powerwall continues to operate normally even when the Gateway is offline — you lose app visibility and remote control, but backup power, solar charging, and self-consumption all work as configured. Contact STS for a remote diagnostic if it remains offline — we can check your router port rules, WiFi settings, and Gateway firmware.

Gateway offline vs Powerwall offline — why it matters

When your Gateway goes offline, the communication bridge between your home and Tesla servers is broken, but your Powerwall itself continues to operate independently. The battery system is designed to work in autonomous islanding mode — it detects local solar generation, powers your home, manages backup energy, and provides power cuts without needing internet or app instructions. All of this happens locally. The Gateway is just the remote monitoring layer. This is why your backup power works perfectly fine even when the app shows offline — the Powerwall never relied on cloud servers for its core functions.

The Gateway's job is to relay your system status to the Tesla app, allow you to change settings remotely, enable Storm Watch (UK Met Office weather integration), and push firmware updates. If the Gateway is offline, you cannot change settings from the app, you cannot see live power flows or battery SOC, and Storm Watch cannot auto-charge your battery before bad weather. But the Powerwall operates exactly as you configured it last — backup reserve stays set, self-consumption mode stays active, and the system keeps charging and discharging. STS diagnoses Gateway offline issues by checking your WiFi connectivity, router firewall rules, and Gateway firmware — independent of Tesla and your installer.

FAQ

Gateway offline — common questions

Your Gateway has lost internet connection. Common causes: WiFi disconnected after you changed routers, port 1883 blocked by your router's firewall, your new router defaults to 5GHz but your Gateway is Gateway 2 (2.4GHz only), or a temporary Tesla server outage. The good news: your Powerwall still operates normally without internet. You lose app monitoring and remote control, but backup, solar charging, and self-consumption continue as configured on your local system.
The LED indicator tells you the Gateway's connection status. Solid green = connected and communicating with Powerwall and Tesla servers. Flashing green = enabled but not communicating with Powerwall — local connection issue. No LED = no power to the Gateway — check your circuit breaker. Flashing red = firmware updating — do not power off, wait for completion. Green plus light blue (Gateway 3 only) = ready for initial commissioning. If you see no LED but the Gateway has power, the LED itself may be faulty.
Standard method (if the Tesla app can reach your Gateway): Tesla app > Powerwall > Settings > WiFi > select your home network and enter the password > wait 2-3 minutes. If the app cannot reach your Gateway: connect your phone to the Gateway's local WiFi network (look for TEG-xxx, where xxx is your serial number) > open the Tesla app — it will now find the local Gateway > configure your home WiFi from the app. After you change routers, always power cycle both your router and the Gateway for at least 30 seconds to clear old network associations.
Yes — absolutely. The Powerwall operates completely independently of internet. Backup power works offline during outages, solar charging works without internet connection, and self-consumption discharges to your home as configured. Internet is only needed for: Tesla app monitoring and remote control, firmware updates and patches, Storm Watch (advance Met Office weather alerts to pre-charge before storms), and server-side analytics. If your Gateway is offline, all core battery functions continue uninterrupted. Your configured backup reserve, charging mode, and self-consumption mode remain active.
Three things usually happen when you change routers. First, WiFi credentials change — your old router's SSID and password no longer work, but the Gateway still has the old credentials stored in memory. Second, frequency band issue (Gateway 2 only) — if your new router defaults to 5GHz-only or merged 2.4/5GHz bands, Gateway 2 cannot connect because it only supports 2.4GHz. You must ensure 2.4GHz is available on your new router. Third, port 1883 blocked — your new router may have stricter firewall settings, and port 1883 (used for MQTT communication) must be open for outbound traffic. Fix: reconnect via the Tesla app or directly to the TEG-xxx local WiFi, confirm your router is set to 2.4GHz or has dual-band, and power cycle both devices for 30 seconds.
Book

Gateway still offline after these steps?

If you have checked the LED status, verified your WiFi band (2.4GHz for Gateway 2), reconnected via the app, checked port 1883 in your router firewall, and the Gateway still remains offline — the issue may be a Gateway hardware fault, a router configuration problem, or a DNS issue. We review your WiFi settings, router firewall rules, and Gateway firmware remotely. Independent from Tesla and your installer.

  • Not affiliated with Tesla Inc
  • Free remote diagnostic · no fix, no fee
  • On-site visits available across the UK

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