Solar Monitoring App Not Working
If your solar app shows "offline" or no data, take a breath: this is almost always a communications problem, not a fault with your panels. The most common cause is a Wi-Fi or router change that knocked your inverter's dongle offline. Your system is very likely still generating normally. This guide walks through the usual causes and the safe checks you can do yourself, plus when to call your installer. If the issue turns out to be the inverter itself, see our solar inverter fault guide.
Quick Answer
A solar app showing offline or no data is usually a communications fault, not a generation fault. The most likely cause is a home Wi-Fi or router change (new router, new password) that knocked the inverter's monitoring dongle offline. First, confirm it is daytime and the inverter screen or lights show it is powered and running, then reboot your home router and wait 10 to 15 minutes. Your panels are very likely still producing power.
Why is my solar app showing offline or no data?
When an app says "offline", it means the app cannot reach your inverter, not necessarily that your inverter has stopped. The path is: panels → inverter → monitoring dongle (Wi-Fi or 4G) → your router → the brand's cloud server → the app on your phone. A break anywhere along that chain shows as "no data". Here are the usual culprits, ordered from most to least common.
Your home Wi-Fi or router changed
By far the most common cause. If you got a new router from your broadband provider, changed your Wi-Fi password, or renamed the network, the inverter's dongle no longer recognises it and silently drops offline. The dongle still remembers the old details and keeps trying to connect to a network that no longer exists.
The inverter is off because it is dark
Many inverters power down at night when the panels stop producing, and most stop reporting to the app in darkness. If your app shows no current data in the evening or early morning, this is usually normal. It should come back to life by mid-morning once there is enough light.
The Wi-Fi or 4G dongle needs re-pairing
The small communication stick (dongle) plugged into your inverter can lose its pairing after a power cut, a firmware update, or simply over time. It often needs to be re-paired with your network through the brand's app, following the manufacturer's steps.
Weak signal: the router is too far from the inverter
Inverters are usually fitted in a garage, utility room, attic, or against an outside wall, often far from the router. The Wi-Fi signal there may be borderline, so the dongle connects, drops, and reconnects. A change in the house (furniture moved, a new appliance, the router relocated) can tip a marginal signal over the edge.
A cloud or server outage on the brand's side
Occasionally the manufacturer's monitoring servers go down for maintenance or an outage. Your inverter and dongle are fine, but the app cannot load data because the cloud behind it is unavailable. This usually clears by itself within a few hours.
An app login or account problem
A forgotten password, an expired session, an app update that needs a fresh login, or your installer's account that your system was originally linked to. Sometimes simply logging out and back in, or updating the app, restores the data.
Safety first
Solar DC wiring and inverters carry lethal voltage, even when the grid is off and even on a dull day. You may safely check app settings, your router, the consumer-unit breaker, and the inverter's own screen or status lights. You must never open an inverter, remove its cover, or touch any DC wiring or connectors. For anything electrical, use a RECI / Safe Electric registered electrician in Ireland, or your original SEAI-registered installer while the system is under warranty.
How to fix a solar app showing no data (safe steps)
Work through these in order. They are all things a homeowner can do safely without opening any equipment. Most offline apps come back after step 1 or 2.
- 1
Confirm the inverter is powered and it is daytime
Go to the inverter and look at its screen or status lights. A steady green light (or a normal display showing power output) usually means it is running and producing. If it is dark outside or the panels are getting almost no light, no app data is normal. Check again in daylight before troubleshooting further.
- 2
Reboot your home router
Switch the router off at the wall, wait 30 seconds, and switch it back on. Wait 10 to 15 minutes for both the router and the inverter dongle to reconnect, then reopen the app. This single step fixes a large share of offline apps.
- 3
Re-check the Wi-Fi details saved on the dongle
In the brand's app, find the device or network settings for your inverter and confirm the Wi-Fi network name and password match your current network exactly. If you recently changed your router or password, re-enter the new details here. Note that many older dongles only work on the 2.4GHz band, not 5GHz, so make sure you are pointing it at the right network.
- 4
Check the brand's status page for an outage
If the inverter looks healthy but the app still shows nothing, search for the manufacturer's service status or check their support social channels for a reported outage. If their cloud is down, there is nothing to fix at your end. Wait a few hours and try again.
- 5
Re-pair the dongle following the manual
If the network details are correct but it still will not connect, the dongle may need re-pairing. Each brand has its own steps in the app and the manual. This typically means putting the dongle into pairing mode, connecting your phone to it temporarily, and selecting your home Wi-Fi. Follow your manufacturer's instructions precisely. Do not unplug anything from inside the inverter.
- 6
Update or reinstall the app and log in fresh
Update the monitoring app to the latest version, or remove and reinstall it, then log in again. This clears expired sessions and login glitches. If you cannot remember which account your system is under, your installer set it up and can confirm it.
Lost app data does not mean lost power or lost payments
A blank app does not mean your panels stopped or that you stopped earning. Your Clean Export Guarantee (CEG) export is metered independently by ESB Networks at your smart meter, completely separate from your monitoring app. Even if the app showed nothing for a week, every unit you exported is still being recorded for your supplier to pay you. The app is a convenience, not the billing record.
Common solar monitoring apps by inverter brand
The app you use depends on your inverter or microinverter brand. The fixes above apply to all of them, since they share the same path from inverter to dongle to cloud to app. If you are not sure which brand you have, check the label on the inverter or see our solar inverter brands guide.
| Brand | Monitoring app / portal |
|---|---|
| Huawei | FusionSolar |
| Solis | SolisCloud |
| GoodWe | SEMS Portal |
| SolarEdge | mySolarEdge |
| Enphase | Enlighten |
| FoxESS | FoxCloud |
| Sunsynk | Sunsynk Connect |
| Solax | SolaxCloud |
App names can change between versions. If FusionSolar, Enphase Enlighten, SolisCloud or any other app is not connecting, the comms checks above are the right starting point regardless of brand.
When to call an installer or electrician
If you have worked through the safe steps and the app is still offline, or if you see anything that suggests a fault beyond communications, stop and get a professional involved. Do not open the inverter yourself.
Call your SEAI-registered installer if
- The system is still under warranty (comms and dongle issues are usually covered).
- The app stays offline after rebooting the router and re-checking Wi-Fi.
- You cannot re-pair the dongle following the manual.
- You are unsure which account your system was registered under.
Call a RECI / Safe Electric electrician if
- The inverter shows a red light, error code, or no display at all in daylight.
- The inverter is silent and clearly not producing, not just offline in the app.
- There is a tripped breaker that keeps tripping, a burning smell, or any sign of heat or damage.
- Any work near DC wiring or inside the inverter is needed.
A genuine inverter fault is different from a comms dropout. If the inverter itself is showing an error rather than simply failing to report, our solar inverter fault guide explains what the warning lights and codes usually mean and what to do next.
Irish context: your export is metered, not app-based
In Ireland, the money side of your solar is handled completely separately from your monitoring app, which is reassuring when the app goes dark.
- ESB Networks meters your export. Your smart meter, read by ESB Networks under the National Smart Metering Programme, records every unit you send back to the grid. This is what your supplier uses to pay your Clean Export Guarantee (CEG). It is independent of your inverter app, so an offline app does not affect your export payments.
- Your NC6 connection is unaffected. The NC6 notification your installer submitted to ESB Networks registers your micro-generation connection. A monitoring dropout has no bearing on it.
- Check your supplier statements, not the app, for payments. If you want to confirm you are still being credited for export, look at your electricity supplier's bills or online account, where CEG credits appear. The app is only a live view of generation and self-consumption.
So a blank or offline app is an annoyance to fix, not a financial emergency. Your generation and your export earnings carry on while you sort out the connection.
Frequently Asked Questions About a Solar App Not Working
Does an offline solar app mean my panels have stopped working?
Usually not. An offline app almost always means a communications problem between your inverter and the brand's cloud, not a generation problem. The panels are typically still producing power normally. Check the inverter's own screen or status lights in daylight: a steady green light or a normal power reading means it is running fine even when the app shows nothing.
Why did my FusionSolar, Enphase or SolisCloud app suddenly stop showing data?
The most common reason across all these apps is a home Wi-Fi change. If you got a new router from your broadband provider or changed your Wi-Fi password, the inverter's monitoring dongle lost its connection and dropped offline. Reboot your router, then re-enter your current Wi-Fi name and password in the app's device settings. Many older dongles also only work on 2.4GHz, not 5GHz.
Will I lose my CEG export payments if the app is offline?
No. Your Clean Export Guarantee export is metered by ESB Networks at your smart meter, completely separately from your monitoring app. Every unit you export is still recorded for your supplier to pay you, even if the app showed no data for days. The app is a convenience for viewing generation, not the billing record. Check your supplier statements to confirm CEG credits.
My app shows no data in the evening but works during the day. Is that a fault?
No, that is normal for many systems. A lot of inverters power down once the panels stop producing at night and stop reporting to the app in darkness. The data should return by mid-morning once there is enough light for the inverter to wake up. Only treat persistent daytime gaps as a problem worth troubleshooting.
Can I open my inverter to fix the connection myself?
No. Solar DC wiring and inverters carry lethal voltage, even when the grid is off and on dull days. You can safely check the app, your router, the breaker, and the inverter's external screen or lights, but you must never open the inverter or touch DC wiring. For anything electrical, use a RECI / Safe Electric registered electrician, or your original SEAI-registered installer while under warranty.
Related Guides
Solar Troubleshooting
Diagnose common solar faults: generation, inverter, battery, export.
Solar Inverter Fault
Red light or fault icon? What it means and what to check.
Solar Inverter Brands
Best solar inverter brands in Ireland ranked by efficiency, warranty, and value.
Solar Panels Not Generating
No output? Inverter, isolator and breaker checks first.
Sources
- ESB Networks: Smart metering and microgeneration, esbnetworks.ie
- SEAI: Solar Electricity Grant and registered installers, seai.ie
- Safe Electric: Find a registered electrician (RECI), safeelectric.ie
Last updated: June 2026
Fact-checked by John Rooney, Solar Energy Editor. Editorial policy
John Rooney is the founder of Solar Info and has been covering the Irish solar energy market since 2023. He fact-checks all content against official SEAI data and maintains relationships with SEAI-registered installers across Ireland.
Still Offline? Get Help From a Local Installer
If your app stays offline after the safe checks, an SEAI-registered installer can diagnose the comms fault or inverter issue. Get free quotes from vetted installers near you.