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Problem diagnosis · Fronius

Fronius Solar.web Offline — Not Updating or Connecting

Your Fronius Solar.web portal shows the system as offline or the monitoring data has stopped updating. In almost every case, this is a WiFi connectivity issue — not a fault with the inverter itself. Your system is still generating power while you troubleshoot.
  • Not affiliated with Fronius
  • Free remote diagnostic · no fix, no fee
  • WiFi + Datamanager troubleshooting
Solar.web been offline for weeks?

If basic troubleshooting has not restored your monitoring, the Datamanager card inside the inverter may have failed — or a firmware issue is preventing reconnection. We can diagnose the cause remotely and arrange a fix.

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Independent — not affiliated with Fronius International.

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

Your system is still generating. Solar.web offline means the monitoring connection has dropped — it does not affect the inverter output. Your panels are still producing power and exporting to the grid normally. Only the remote monitoring link needs restoring.

Diagnostics

6-step Solar.web reconnection guide

Work through these steps in order. Most Solar.web connectivity issues are resolved by step 3 or 4.

1

Confirm the inverter is still generating

Check the inverter display. If the green LED is on and the screen shows current power output in watts, the system is generating normally. Solar.web offline is purely a monitoring issue — the inverter produces power independently of the internet connection.

This is important because it means there is no urgency. Your system is not losing generation while you work through the connectivity troubleshooting. If the inverter display is off or showing a red LED, that is a different issue — check the state code alarm guide instead.

2

Check your WiFi network is on 2.4 GHz

The Fronius Datamanager only supports 2.4 GHz WiFi. It cannot connect to 5 GHz networks. This is the single most common cause of Solar.web going offline in the UK — modern routers from Sky, BT, Virgin, and other ISPs often default to dual-band with automatic band-switching.

If your ISP recently upgraded your router, changed your broadband package, or you switched to a mesh WiFi system, the Datamanager may have lost its connection. Log into your router settings and confirm that a 2.4 GHz network is available.

Mesh WiFi systems (Eero, Orbi, Deco) are a frequent cause of Fronius disconnections. The Datamanager can struggle with roaming between mesh nodes. If you use mesh WiFi, try locking the inverter to a specific access point or using a separate 2.4 GHz access point with an Ethernet backhaul.

3

Power cycle the inverter

A power cycle resolves the majority of temporary Solar.web disconnections:

1. Switch off the AC isolator at the consumer unit
2. Switch off the DC isolator below the inverter
3. Wait 30 seconds
4. Switch the DC isolator back on, then the AC isolator
5. Allow five minutes for the Datamanager to reconnect

Check Solar.web after five minutes. If the system appears online and data is updating, the issue was a temporary communication drop. If it remains offline, continue to step 4.

4

Connect to the Datamanager and re-run the setup wizard

The Datamanager broadcasts its own WiFi network for configuration. Look for a network called FRONIUS_240 followed by a serial number. Connect your phone or laptop to this network — the default password is 12345678.

Once connected, open a browser and navigate to 192.168.250.181. This opens the setup wizard. Select your home WiFi network from the list, enter your WiFi password, and save. The Datamanager will disconnect its own access point and connect to your home network.

If the FRONIUS_240 network does not appear after a power cycle, the Datamanager card may have failed — skip to step 6.

5

Check for Datamanager firmware updates

Outdated Datamanager firmware can cause persistent connectivity issues, particularly after Fronius updates the Solar.web platform. If you can access the Datamanager web interface at 192.168.250.181, check the current firmware version under the system information section.

Fronius periodically releases firmware updates that fix connectivity bugs and improve WiFi stability. However, firmware versions cannot be skipped — if your unit is running a very old version, it may need intermediate updates before reaching the current release. If you are unsure about the update path, leave this step to an engineer.

6

Book a diagnostic if the Datamanager has failed

If the FRONIUS_240 WiFi network does not appear at all after a power cycle, the Datamanager card has likely failed. This is a hardware component inside the inverter that cannot be repaired — only replaced. Other signs of Datamanager failure include no LED activity on the card and the configuration addresses being completely unreachable.

STS can confirm remotely whether the issue is WiFi configuration or a failed Datamanager card, and arrange a replacement if needed. The inverter continues generating normally without the Datamanager — only monitoring is affected.

Why UK router changes are the top cause of Solar.web disconnections

The Fronius Datamanager was designed when 2.4 GHz WiFi was the standard. UK broadband providers have since moved to dual-band and tri-band routers, and fibre rollout across the country means millions of households have had their router replaced in the last two years. Each time a router is swapped, the WiFi network name or password may change — and even if they stay the same, the new router may handle the 2.4 GHz band differently.

Sky Q and Sky Glass routers, BT Smart Hub 2, and Virgin Media Hub 5 all use combined SSIDs that broadcast 2.4 GHz and 5 GHz on the same network name. The router decides which band to assign each device to, and the Fronius Datamanager sometimes gets pushed to 5 GHz where it cannot connect. The fix is either to create a separate 2.4 GHz SSID in the router settings or to use a dedicated 2.4 GHz access point for the inverter.

Mesh WiFi systems add another layer of complexity. The Datamanager connects to whichever mesh node has the strongest signal, but when that node hands off to another, the connection can drop. For reliable Fronius monitoring on a mesh network, the best approach is a separate 2.4 GHz access point connected via Ethernet to the mesh — keeping the inverter on a stable, non-roaming connection.

Monitoring offline — all brands
FAQ

Solar.web offline — common questions

The most common cause is a WiFi connectivity issue between the Fronius Datamanager and your home router. This can be triggered by an ISP router upgrade, a WiFi password change, the router switching to 5 GHz only, or a temporary signal dropout. Mesh WiFi systems are also a frequent cause. Less commonly, the Datamanager card inside the inverter has failed. Solar.web offline does not mean your system has stopped generating — the inverter produces power independently of the monitoring connection.
The inverter continues to record generation data locally while the monitoring connection is down. When the connection is restored, the Datamanager syncs the buffered data to Solar.web, so you do not lose your production history. However, if the connection is down for an extended period, the local buffer may fill up. Restoring connectivity promptly ensures a complete record. Your actual energy generation and grid export are not affected by the monitoring status.
In most cases, yes. Start with a power cycle — switch off the AC and DC isolators, wait 30 seconds, and switch them back on. If that does not work, connect to the FRONIUS_240 WiFi network, go to 192.168.250.181 in a browser, and re-enter your home WiFi credentials in the setup wizard. Make sure your WiFi is broadcasting on 2.4 GHz. If the FRONIUS_240 network does not appear at all after a power cycle, the Datamanager card may have failed and needs professional replacement.
The Datamanager is a communications card inside the Fronius inverter that handles the connection to Solar.web. It contains a WiFi module and an Ethernet port. On Primo and Symo inverters, it is either integrated or installed as a plug-in card. The Datamanager broadcasts its own WiFi access point for initial setup, then connects to your home network to send monitoring data to the Solar.web portal. If the card fails, the inverter continues to generate power — only remote monitoring is lost.
Connect to the FRONIUS_240 WiFi network broadcast by the Datamanager — the default password is 12345678. Open a browser and go to 192.168.250.181. This opens the setup wizard where you can select your home WiFi network and enter the password. If the FRONIUS_240 network is not visible, try a power cycle first — switch off both AC and DC isolators, wait 30 seconds, then restart. The access point should appear within two minutes of the inverter powering back on.
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Solar.web still offline? We can fix it remotely.

We diagnose whether the issue is WiFi configuration, firmware, or a failed Datamanager card — and get your monitoring back online without an unnecessary site visit.

  • Not affiliated with Fronius
  • Free remote diagnostic · no fix, no fee
  • Datamanager replacement arranged if needed

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