Fronius Solar.web App Guide: How to Use It

What is the Fronius Solar.web app and which version do you have?

Solar.web is available as a website and as an iOS and Android app, and it pulls data straight from your inverter over Wi-Fi or Ethernet. It gives you real-time access to your system’s production, consumption, battery status, and fault alerts from anywhere.

Fronius recently overhauled Solar.web, and many homeowners with older systems are still using the legacy version. Some longtime owners find the new version harder to navigate, and many dislike that longer-term history now sits behind a paid tier. Here’s how to know which version you likely have:

• New Solar.web (2022 and later): If your Fronius inverter was installed in 2022 or later, you’re likely on the redesigned Solar.web platform with updated branding and interface. Recent updates added zoomable energy charts and a Year tab for systems that don’t have a Smart Meter.
• Legacy Solar.web (pre-2022 systems): Older Fronius Primo, Symo, and Galvo inverters from 2015–2021 typically use the original Solar.web interface. It still functions but doesn’t receive the latest feature updates.

Both versions provide core monitoring, but the new app includes premium features like production forecasts and the Energy Cost Assistant for newer hybrid inverters like the GEN24 Plus. If you’re unsure which version you have, log into solarweb.com and check the interface—legacy users will see an older design with a different layout.

Navigating the Solar.web dashboard: What you’ll see

The opening screen gives you live data: what your panels are producing right now, what the house and grid are doing, and today’s totals. The dashboard is your home base for monitoring performance.

Here’s what the main screen shows:

• Live power (kW): Current solar generation in kilowatts. This updates every few seconds when your system is producing.
• Energy balance today (kWh): Production shows in green. With a Fronius Smart Meter, consumption appears as an outline over the chart, with self-consumed energy shaded grey. Without a Smart Meter, you’ll only see production data.
• Grid export/import (kW): How much power you’re sending to the grid or drawing from it right now. Only visible with a Smart Meter.
• Battery state of charge (%): If you have a battery system paired with your inverter, this shows the current charge level and whether the battery is charging or discharging.

The dashboard also displays system alerts if your inverter detects a fault. Automatic notifications help you catch and fix errors quickly, so the system spends less time down.

Without a Fronius Smart Meter, the app only knows what your panels produce, not what your home uses. If you’re serious about optimizing self-consumption, a Smart Meter is essential. You can add one to most Fronius systems at any time through a certified installer.

How to read the energy flow diagram

The energy flow diagram is one of Solar.web’s most useful features. It shows you in real time where your solar energy is going: to the home, to the battery, or to the grid.

The live view shows solar output, household use, battery level and grid export side by side. The diagram uses animated lines and icons to represent energy moving between your panels, inverter, battery, home, and utility grid.

Here’s how to interpret it:

• Solar icon (top): Shows current production from your panels in kilowatts.
• Home icon (center or bottom): Displays how much power your home is consuming right now.
• Battery icon (if installed): Shows state of charge and whether it’s charging (green arrow into battery) or discharging (arrow out of battery).
• Grid icon: Indicates whether you’re exporting surplus power (arrow toward grid) or importing from the utility (arrow from grid toward home).

The thickness of the animated lines corresponds to the amount of power flowing. During peak midday production, you’ll see thick green lines from solar to home and grid. At night, you’ll see power flowing from the battery or grid to your home.

The numbers aren’t instant. How often they refresh depends on your internet connection, how the system is set up and how busy Fronius’s servers are. Don’t worry if there’s a 10–20 second lag—that’s normal for cloud-based monitoring.

Setting up push notifications for faults and alerts

One of Solar.web’s best features is automatic fault alerts. Alerts go to you and your installer, so many problems can be diagnosed without a site visit. Here’s how to make sure you’re set up to receive them.

Step 1: Enable notifications in the app

Open the Fronius Solar.web mobile app, tap the menu icon, and go to Settings → Notifications. Make sure push notifications are enabled for your device. On iOS, you’ll need to allow notifications at the system level the first time you open the app.

Step 2: Configure alert types

You can get alerts by email, by push notification in the mobile app, or by SMS as a paid add-on. In the web portal (solarweb.com), navigate to your system settings and choose which alerts you want to receive:

• Communication failure: Inverter has stopped uploading data. Brief internet hiccups trip this one often, so it helps to set a delay of 4 to 6 hours before an email goes out.
• Hardware fault: the inverter has logged an error such as over-voltage, overheating, an isolation fault or an internal failure. Temporary ones like heat derating often clear within minutes, but a code that keeps coming back needs a technician.
• Underperformance alert: System is producing significantly less than expected for current weather conditions. Useful for catching soiling, shading issues, or tripped breakers.

Step 3: Add secondary contacts

You can add your installer or a family member as a secondary contact to receive alerts. A single alert can go to several people at once. This is especially helpful if you’re away from home or not actively monitoring the app.

If you don’t receive a test notification after setup, check that your inverter is connected to the internet and that you’ve verified your email address in your Solar.web account.

When a fault alert arrives, our Fronius state code guide explains what it means.

Understanding historical data and Solar.web Premium

The free version of Solar.web gives you live data and up to three days of historical production and consumption charts. To see detailed history past three days, you need a paid Solar.web Premium subscription. This has frustrated many longtime Fronius owners who previously had unlimited access.

The free tier covers the basics, and Premium adds deeper analysis for an extra fee.

Here’s what Premium adds:

• Unlimited historical data: Access years of production and consumption data for trend analysis.
• Production forecasts: Premium can also show a production forecast in your daily and monthly energy balance, which helps you plan heavy usage for sunny periods.
• Custom reports: Generate PDF reports for specific date ranges—useful for warranty claims or verifying installer performance guarantees.
• Advanced energy cost analysis: For GEN24 Plus and Verto systems with batteries, Premium unlocks the Energy Cost Assistant, which optimizes battery charging based on time-of-use rates.

Note: the app and the browser version are built differently, and some Premium features only work in the browser. To get everything, open Solar.web in your phone’s browser instead of the app.

Premium costs vary by region but typically run $50–$80 per year. If you’re a casual monitor who just wants to make sure the system is working, the free version is fine. If you’re optimizing consumption or managing a battery system, Premium is worth it.

What happens if Fronius exits the US residential market?

This is a legitimate concern for Fronius owners in the U.S. While Fronius has kept launching U.S. residential products, such as the Essential Backup Load Unit for the GEN24 Plus, which arrived on April 30, 2026, the company’s long-term commitment to the U.S. residential sector has been questioned by some in the industry.

Here’s what you need to know:

Your monitoring will likely continue. Solar.web is a cloud-based platform hosted on European servers. Fronius says its systems are covered by an ISO 27001-certified information security program with regular audits. Even if Fronius were to scale back U.S. residential sales, existing customers’ monitoring would almost certainly remain active. The cost to Fronius of maintaining cloud access for existing systems is minimal.

Warranty service may become harder. If Fronius reduces its U.S. distribution footprint, getting replacement parts or warranty service could take longer. Most Fronius inverters carry a 10-year standard warranty, with optional extensions available through Solar.web registration. Make sure you’ve registered your system and documented your warranty terms.

Third-party monitoring is an option. If you’re concerned about long-term Solar.web availability, you can integrate most Fronius inverters with third-party platforms like Home Assistant using Modbus or the Solar API. This gives you local monitoring that doesn’t depend on Fronius cloud servers. Some users have already set this up as a backup—owners who want more control often link the inverter to a home automation platform such as Home Assistant through Fronius’s SolarNet and Modbus interfaces.

For now, Fronius remains active in the U.S. market and continues to release new products. If you’re buying a new system today, Fronius is still a solid choice—but it’s worth asking your installer about their service plan and parts availability if you’re concerned about long-term support. Need help finding a reliable installer? Find a solar installer who can walk you through equipment options and service commitments.

Troubleshooting common Solar.web app issues

Even the best monitoring platforms have quirks. Here are the most common issues Fronius owners report and how to fix them.

App won’t load data or shows “no connection”

First, check that your inverter is online. Solar.web always runs a little behind, so a short delay is normal. If it’s been more than 10 minutes with no data, restart your inverter by flipping the DC disconnect switch off, waiting 30 seconds, then turning it back on. This often resolves connectivity issues.

If the inverter display shows it’s producing power but Solar.web still shows no data, the issue is likely with your home’s internet connection or the inverter’s Wi-Fi link. Check your router and make sure the inverter is still connected to your network.

App keeps logging you out

Over the past few months, some owners have reported the app signing them out every few minutes. This is a known bug in recent app versions. Fronius support recommends clearing the app cache (Settings → Apps → Solar.web → Clear Cache on Android) or reinstalling the app. If the problem persists, contact Fronius support at support@fronius.com with your device model and app version.

Energy flow animation freezes or resets to zero

Some owners report that the animation on the Overview tab stalls about every 20 seconds, and the grid and home values drop to zero for roughly 10 seconds before the live numbers come back. This appears to be a software bug in the June 2026 update. You can disable the animated flow diagram in Settings → Display and use the static data view instead.

Historical data missing or incomplete

If you see gaps in your historical production data, the inverter likely lost internet connection during that period. Solar.web only uploads data when the inverter is online, and it doesn’t backfill missed data once connectivity is restored. If this happens frequently, consider a more reliable internet connection or a cellular backup router for your inverter.

For persistent issues, Fronius offers installer-focused support through the Solar.SOS app, which can diagnose inverter connectivity and configuration problems remotely.