<!– –>{ “@context”: “https://schema.org”, “@graph”: [ { “@type”: “Article”, “headline”: “Solar Inverter Not Connecting to WiFi — Diagnose and Fix”, “description”: “Your solar inverter or battery can’t connect to your home WiFi. This covers every common cause — wrong SSID, 5GHz band, weak signal, stuck in AP mode, and router changes.”, “url”: “https://solar-tech-support.co.uk/problems/wifi-not-connecting/”, “datePublished”: “2026-03-18”, “dateModified”: “2026-03-18”, “author”: { “@type”: “Organization”, “name”: “STS Solar Tech Support”, “url”: “https://solar-tech-support.co.uk” }, “publisher”: { “@type”: “Organization”, “name”: “STS Solar Tech Support”, “url”: “https://solar-tech-support.co.uk” } }, { “@type”: “HowTo”, “name”: “How to get a solar inverter or battery back onto WiFi”, “description”: “Step-by-step process for reconnecting a solar inverter or battery WiFi dongle to a home network after a failed connection or router change.”, “url”: “https://solar-tech-support.co.uk/problems/wifi-not-connecting/”, “step”: [ { “@type”: “HowToStep”, “name”: “Confirm your router broadcasts a 2.4GHz network”, “text”: “Almost all solar inverters and battery WiFi modules only support 2.4GHz WiFi. If your router uses a combined (merged) 2.4GHz and 5GHz network under a single SSID, the inverter may consistently fail to connect or connect briefly then drop. Check your router settings and ensure a 2.4GHz-only SSID is available.” }, { “@type”: “HowToStep”, “name”: “Check WiFi signal strength at the inverter location”, “text”: “Stand next to the inverter with your phone and check WiFi signal strength. Many inverters require a signal of -70 dBm or better (some specify RSSI ≥60%). A weak signal causes repeated disconnections rather than outright failure to connect. If signal is poor, a WiFi extender or powerline adapter at the inverter may be needed.” }, { “@type”: “HowToStep”, “name”: “Confirm the SSID and password haven’t changed”, “text”: “If your router was recently replaced, your broadband provider changed, or someone updated the router password, the inverter will fail to reconnect. You will need to run through the WiFi setup process again using the inverter’s configuration page or app.” }, { “@type”: “HowToStep”, “name”: “Check whether the inverter is stuck in AP (hotspot) mode”, “text”: “Many inverters broadcast their own WiFi hotspot (AP mode) when they have lost their connection or been reset. Check whether an SSID matching your inverter brand appears in your phone’s WiFi list. If it does, the device needs to be reconfigured — it is advertising for a setup connection rather than connecting to your network.” }, { “@type”: “HowToStep”, “name”: “Run the WiFi setup process from the app or configuration page”, “text”: “Follow the brand-specific WiFi setup process to reconnect. For GivEnergy this involves connecting to the dongle’s AP hotspot, navigating to 10.10.100.254, selecting your network, and entering your password. 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The fix is to ensure a 2.4GHz-only SSID is available from your router.” } }, { “@type”: “Question”, “name”: “My router was replaced — why has solar monitoring gone offline?”, “acceptedAnswer”: { “@type”: “Answer”, “text”: “When your router is replaced, the WiFi network name (SSID) and password almost always change. Your inverter or battery has the old credentials stored and cannot connect to the new network. You need to run the WiFi setup process again to give the device the new network details.” } }, { “@type”: “Question”, “name”: “What does AP mode mean on a solar WiFi dongle?”, “acceptedAnswer”: { “@type”: “Answer”, “text”: “AP (Access Point) mode is when the WiFi dongle broadcasts its own hotspot network instead of connecting to yours. This happens when the device has no stored credentials, its credentials have been cleared, or it has been reset. You can see this by checking your phone’s WiFi list for an SSID like ‘GivEnergy-XXXXXX’ or similar. Once in AP mode you connect to the dongle’s hotspot, open a configuration page, and set up the home network connection.” } }, { “@type”: “Question”, “name”: “How do I improve WiFi signal at my inverter?”, “acceptedAnswer”: { “@type”: “Answer”, “text”: “Options in order of cost and complexity: move your router closer (rarely practical); add a WiFi extender or mesh node near the inverter; use a powerline ethernet adapter to bring a wired connection near the inverter and use its WiFi; or use a WiFi dongle with a better antenna. 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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.
Work through the checks below. Most WiFi faults are resolved without engineer involvement.
Affects all solar brandsUsually solvable without an engineerSystem still generates without WiFi
Checked everything below and still stuck?
Some WiFi faults need deeper diagnosis — particularly if the dongle hardware has failed or the inverter firmware has an issue. A remote session can confirm the cause.
Note: WiFi issues don’t stop your system generating. Your panels and battery are still working — you just can’t see the data.
The four most common causes
Check these first before going further.
📶
5GHz network
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 an SSID matching your inverter brand.
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
Solar inverters use 2.4GHz WiFi only — they cannot 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 least two or three bars, ideally more. Most inverters require RSSI of -70 dBm or better.
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 networks named with your inverter brand — for example “GivEnergy-A1B2C3”, “Growatt-XXXXXX”, or “SolarmanAP-XXXXXX”.
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.
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 and low-cost — but you need to confirm this is the cause first.
▸
Firmware bug introduced by an update
Some firmware updates have introduced WiFi connectivity regressions. If connectivity was lost immediately after a firmware update, the firmware may need to be rolled back or a patch applied — this requires remote access to the device configuration.
▸
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.
Your system is still generating. A WiFi connectivity fault only affects monitoring — it does not stop your solar panels generating or your battery operating. The system will continue to work as configured; you just won’t be able to see live data until connectivity is restored.
Brand-specific WiFi setup guides
For step-by-step instructions to reconnect your specific brand.
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.
No — almost all 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.
When your router changes, so does the network name and password. Your inverter has the old credentials stored and cannot connect to the new network. You need to run the WiFi setup process again to update the stored credentials.
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 an SSID like “GivEnergy-XXXXXX” in your phone’s WiFi list. Connect to it, then follow the setup process for your brand to configure the home network connection.
No. WiFi connectivity only affects monitoring — your ability to view live and historical data. The system continues generating solar power and the battery continues operating as configured. Timed charge schedules are stored locally on the inverter and are not affected by loss of internet connectivity.
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.
