We moved from BT to Vodafone recently. Unfortunately our GivEnergy AIO would no longer appear on the App. Additionally our GivEnergy EV charger stopped working. Vodafone insisted that their dual 2.4ghz and 5ghz compatibility mode would work with the 2.4ghz system. Unfortunately it doesn't. After nearly two weeks of trying to sort this, which also involved searching on various chat forums, I sent an email for help to STS. Within a very short time the same day I got a call from Ash, who is only 45 minutes away from us. He came and quickly got the AIO appearing on the app, so we could once again see the state of the battery. The EV charger presented more of a challenge as the QR code fixed on the side of the charger had worn away. Ash was able to find the necessary information to restore the EV charger to working order. I have a copy of the QR code and other information should we have an issue another time. I had bought a TP-Link TL-WA850RE that just works on 2.4ghz and this is linked permanently to the GivEnergy kit. STS are definitely the people to contact if you find yourself in a similar situation. We are very happy with the service STS provided.
Fronius Solar.web Offline — Not Updating or Connecting
- Not affiliated with Fronius
- The step-by-step guide is free to follow
- WiFi + Datamanager troubleshooting
If basic troubleshooting has not restored your monitoring, the Datamanager card inside the inverter may have failed — or a firmware issue is preventing reconnection. If the Datamanager still won't join your WiFi, we can set it up on site, from £195, and if the card has failed, we can arrange a replacement.
Book on-site WiFi setupBack to Fronius hubIndependent — not affiliated with Fronius International.
Givenergy panels and battery had been offline for a couple of months after various changes by Givenergy to their app etc. Ron did a fantastic job of sorting it out - got things up and running almost immediately, followed by some fine tuning to get things fully configured. What a legend - great service, great comms, great result.
Just had my whole givenergy system go down. Battery and inverter. Ron sorted me out today 3 hours to get it all sorted. Clear instructions and successful. Could not ask for better. Now that givenergy has gone bust i was concerned as to where to go for help. I have found it and can recommend them to all you givenergy users out there. Off for a cup of coffee now😄
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)
Absolute legend found the fault in 5mins definitely will be using again definitely would recommend to others .
Ron is truly a gem. Logged into my GivEnergy system remotely, dignosed a faulty cell in the battery, providing clear explanation, including screen grabs. Offered advice of companies I could use to fix battery. All completed over WhatsApp with clear, precise & friendly comms. Stayed true to company statement/ethos "We dont fix it, you dont pay" and didn't charge me aynthing. 100% recommend if you have any issues with your solar system.
Offline is usually a monitoring problem. Solar.web offline means the monitoring connection has dropped, which on its own does not affect the inverter output. The system usually keeps running, but offline doesn't prove it, so check the inverter's own screen. If the screen shows power output, only the remote monitoring link needs restoring.
6-step Solar.web reconnection guide
Work through these steps in order. Most Solar.web connectivity issues are resolved by step 3 or 4.
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.
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.
Power cycle the inverter
A power cycle resolves the majority of temporary Solar.web disconnections:
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.
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.
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.
Get help 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.
If the card has failed, STS can arrange a replacement. If the Datamanager needs reconnecting to your WiFi, we can set it up on site, from £195: we connect it to your WiFi, set up your router, including a separate 2.4 GHz network if it needs one, and check it's reporting. 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.
Solar.web offline — common questions
Solar.web still offline after these steps?
If the Datamanager needs reconnecting to your WiFi, we can set it up on site, from £195: we connect it to your WiFi, set up your router, including a separate 2.4 GHz network if it needs one, and check it's reporting. If the signal doesn't reach, a WiFi extender is an extra £75, and we carry them with us. If the Datamanager card has failed, we arrange a replacement.
- Not affiliated with Fronius
- No fix, no fee covers remote fixes. On-site work is quoted in writing before we start.
- Datamanager replacement arranged if needed
We’re busier than ever. Thank you for your patience.
Due to unprecedented demand we’re currently only carrying out on-site work in Yorkshire, and replies are taking up to 7 days. Remote diagnostics continue for the whole UK as normal.
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