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Connectivity fault · All brands

Solar inverter not connecting to WiFi

Your inverter or battery is refusing to join your home network — or drops off it repeatedly. This is almost always one of four things: wrong WiFi band, changed router credentials, weak signal, or the device stuck in setup mode.
from £195 on-site WiFi setup · extender £75 extra if needed
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  • Affects all solar brands
  • Free steps first, on-site setup if needed
  • System usually keeps running without WiFi
Can't get it connected?

Follow the free step-by-step guide on this page. If it still won't connect, we 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.

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Note: your system usually keeps running without WiFi, but the app can't show you a fault, so check the inverter's own screen.

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Solar Tech have been everything you expect and want from a support organisation. Easy to contact, quick to respond and their expertise and knowledge about GivEnergy Systems was amazing. All the work was done remotely, and they guided me through the recovery of a failed system, which ended up to be down to a physically damaged USB key installed in production that was corrupted and stopping one battery from working, locking the whole system. All fixed and the system is working again. Massive thanks to the team and their help. Will be my goto for any future issues with our GivEnergy system. The pictures shows the condition of the USB as installed..

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Ron made more sense in 20 mins than our installer has done over the last 12 months There is a jungle out there and you need someone like Ron to give a comprehensive overview and solution

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Following an email enquiry i was able use Whatapp Chat to work with their online support agent who successfully solved my battery problem. Having been told that it had gone into sleep mode and would require a site visit Solar Tech successfully sorted the problem remotely. No hassle and no success no fee. Recommended Givenergy system support team.

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Within an hour they were online and after less than another hour had it all sorted. Good communication throughout.

Philip Gerrish · Nov 2026 Google

Absolutely fantastic experience, after months of being fobbed off with rubbish from the installer Ronald fixed my issues in a few hours, his attention to detail and his tenacity was amazing, not only did he go above and beyond but did not ask for payment i had to ask him how to pay. If you need a solar fix this company is brilliant

Richard Rodgers · Aug 2026 Google

Ronald was able to organise a brilliant electrician with extensive experience of GivEnergy systems local to me in the SW. I have now got a fully functioning system and suspect that my electricity bill will be substantially reduced or in credit over a year. Also when said electrician discovered an overvoltage in the my local grid, Ronald prepared a very lucid and comprehensive report of the situation which I have now supplied to my local grid. Cannot recommend Ron and Dan enough.

Ian Macmillan · Jul 2026 Google

Written by · Independent Solar Engineer Last updated

The four most common causes

Check these first before going further.

5GHz network

Most solar inverters only support 2.4GHz. If your router uses a combined band or 5GHz-only network, the inverter won't connect or will drop repeatedly.

Router replaced / password changed

The inverter has your old credentials stored. After any router change you must run the WiFi setup process again with the new details.

Weak signal

If the inverter is in a utility room, garage, or outbuilding, the signal may be too weak for a stable connection. A WiFi extender near the inverter often solves this.

Stuck in AP mode

The inverter or dongle is broadcasting its own hotspot, waiting to be configured. Check your phone's WiFi list for a network named with the device's serial number: on GivEnergy and Fox ESS it starts with W.

How to diagnose and fix it

Work through these in order. Each step either resolves the issue or narrows down what's causing it.

1
Check your router broadcasts a 2.4GHz network

Most solar inverters use 2.4GHz WiFi only and can't connect to 5GHz. Many modern routers broadcast a combined network that merges both bands under one SSID. The inverter may connect briefly then drop as the router tries to move it to 5GHz.

Log into your router admin page and check the wireless settings. If there is no separate 2.4GHz SSID, create one — this is usually a setting called "band steering" or "smart connect" that you can disable to separate the bands.

2
Check signal strength at the inverter location

Stand next to the inverter with your phone and check the WiFi signal meter for your 2.4GHz network. You need a strong signal at the inverter itself.

If the signal is weak, a WiFi extender or mesh node placed near the inverter is usually the quickest fix. A powerline ethernet adapter is more reliable and avoids WiFi altogether.

3
Check whether the router or password changed recently

If your broadband provider changed, your router was replaced, or your WiFi password was updated, the inverter still has the old credentials. It will keep failing to connect but you won't see any obvious error — it just stays offline. You need to run the WiFi setup process again with the new network name and password.

4
Check whether the device is in AP (hotspot) mode

When an inverter or dongle has no network to connect to, it broadcasts its own WiFi hotspot so you can configure it. Look at your phone's WiFi list for a network named with the device's serial number, sometimes with AP_ in front. On GivEnergy it's a W followed by letters and numbers, and on Fox ESS it's W- and the last seven characters of the logger's serial number.

If you see this, the device needs to be configured. Connect to the hotspot and follow the brand-specific setup process.

5
Run the WiFi setup process for your brand

If steps 1–4 are resolved and the device still won't connect, run a fresh WiFi setup from scratch. Most brands require you to connect to the device's AP hotspot first, then use either the app or a web browser to enter your home network credentials. See the brand-specific guides below for exact steps. If it still won't connect after a fresh setup, we can set it up on site, from £195.

Still not connecting after all of the above?

If you have worked through all five steps and the device still won't connect, you are likely looking at one of these less-common causes:

▸
WiFi dongle hardware failure

The WiFi module inside the dongle or inverter has failed. This is more common after lightning events, power surges, or on older units. Replacement dongles are usually available, but confirm this is the cause before you buy one.

▸
Firmware bug introduced by an update

Some firmware updates have introduced WiFi connectivity regressions. If connectivity was lost immediately after a firmware update, note the date and the firmware version, and mention them when you get in touch.

▸
Router security settings blocking the device

Some routers with strict MAC filtering, AP isolation, or client isolation settings will prevent the inverter from connecting or from reaching the internet after connecting. Check your router's security settings and ensure IoT/device isolation is not blocking the inverter's MAC address.

Book on-site WiFi setup

Your system usually keeps running. A WiFi fault on its own doesn't stop your system, but the app can't show you a fault until connectivity is restored, so check the inverter's own screen.

Brand-specific WiFi setup guides

For step-by-step instructions to reconnect your specific brand.

GivEnergy WiFi setup SolarEdge WiFi reconnection Growatt Sunsynk Huawei Smart Logger offline Fox Cloud offline Enphase Envoy WiFi setup Solis datalogger setup Growatt ShinePhone setup Victron VRM portal offline Sigenergy SigenCloud offline AlphaESS AlphaCloud offline Tesla app / gateway offline Fronius Solarweb offline

Related pages

Monitoring offline GivEnergy WiFi setup guide GivEnergy portal offline All problems
FAQ

Frequently asked questions

The most common causes are: the inverter only supports 2.4GHz but your router is 5GHz or combined; the WiFi password changed after a router replacement; the signal at the inverter is too weak; or the device is stuck in AP mode waiting to be configured. Check these four things in order before going further. If none of them fixes it, we can set it up on site, from £195.
Usually not: most solar inverters and battery WiFi modules only support 2.4GHz. On combined networks (where both bands share one SSID) they may connect briefly then drop. The fix is to ensure a separate 2.4GHz SSID is available from your router by disabling band steering or smart connect.
Nothing, if you do it yourself: after a new router or a changed password, the inverter still has the old details stored, so run your brand's WiFi setup again with the new network name and password. If it still won't connect, we 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.
AP (Access Point) mode is when the dongle broadcasts its own WiFi hotspot instead of connecting to your network. This happens when it has no stored credentials or has been reset. You'll see a network named with the device's serial number in your phone's WiFi list, which on GivEnergy and Fox ESS starts with W. Connect to it, then follow the setup process for your brand to configure the home network connection.
Usually not. A WiFi fault on its own affects monitoring: your ability to view live and historical data. The system usually keeps running as configured, but the app can't show you a fault while it's offline, so check the inverter's own screen.
Options in order of reliability: add a WiFi extender or mesh node close to the inverter; use a powerline ethernet adapter to bring a wired connection near the inverter; or check whether the inverter supports a direct ethernet cable connection (many do, and it is the most reliable option). Avoid relying on a weak signal from a distant router. If the signal still won't reach, we can fit a WiFi extender on site: our WiFi setup visit is from £195, and the extender is an extra £75.
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WiFi still not connecting? We can help.

If it still won't connect, we 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. We don't set up or diagnose WiFi remotely or over the phone: it's quicker and more reliable done on site.

  • Independent — not affiliated with any manufacturer
  • On-site WiFi setup, from £195
  • The step-by-step guide is free to follow
  • Dongle replacement arranged if needed

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