Connect Fronius Wattpilot with LadeKosten

How the integration works

The Fronius Wattpilot offers two communication paths, and LadeKosten supports both.

Local WiFi via WebSocket - The Wattpilot runs a WebSocket server on your local network. LadeKosten connects to it directly, receiving real-time updates about charging status, power, and energy consumption. This is the fastest method with zero cloud dependency. The connection uses a device-specific password for authentication.

Cloud via Fronius Solar.web - If you have registered your Wattpilot on the Fronius Solar.web platform, LadeKosten can access your data through the cloud API. This allows monitoring from anywhere and is more reliable if your local network has connectivity quirks.

Both methods provide the same core data: energy consumed per session, charging power over time, and session timestamps. The cloud method may additionally provide solar production context if your Fronius inverter is also connected to Solar.web.

Supported models

Fronius offers two Wattpilot variants:

• Wattpilot Home 11 kW / 22 kW - The wall-mounted charger designed for permanent home installation. Available in single-phase (11 kW) and three-phase (22 kW) versions. Both include a built-in energy meter and WiFi connectivity.
• Wattpilot Go 11 kW / 22 kW - The portable version with the same smart features in a transportable form factor. Ideal if you charge at multiple locations or need a mobile solution. Same API, same LadeKosten compatibility.

Both models connect to your home WiFi and support the local WebSocket interface. Both can also be registered on Fronius Solar.web for cloud access.

Setting up Wattpilot with LadeKosten

For local connection: Make sure your Wattpilot is connected to your home WiFi. Find its IP address in your router's device list or in the Wattpilot's own WiFi settings. In LadeKosten, select Fronius Wattpilot, choose the local connection option, and enter the IP address along with the device password. The app establishes a WebSocket connection and begins streaming data immediately.

For cloud connection: Ensure your Wattpilot is registered on Fronius Solar.web. In LadeKosten, select Fronius Wattpilot, choose the cloud option, and sign in with your Solar.web credentials. The app syncs your session history and sets up automatic updates for future sessions.

In both cases, set your electricity rate per kWh in LadeKosten. If you have a Fronius PV system, you can optionally configure your feed-in tariff to see the value of solar energy used for charging.

Feature highlights

Dual connection options - Choose between local WiFi for speed and privacy, or cloud for remote access and convenience. You can even switch between them depending on your situation.

Real-time WebSocket data - The local connection streams live data to your phone. Watch your charging power, energy delivered, and cost update in real time as your car charges.

Fronius ecosystem integration - If you have a Fronius inverter and Smart Meter alongside your Wattpilot, LadeKosten can leverage the full energy flow data. See exactly how your solar production, home consumption, and EV charging interact.

Solar surplus tracking - When your Wattpilot charges in solar-surplus mode, LadeKosten tracks the split between solar and grid energy. Your cost calculation reflects only the electricity you actually purchased.

Portable charger support - Using a Wattpilot Go at different locations? LadeKosten can track sessions regardless of where you charge, helping you maintain a complete charging cost record.

Tax-ready reports - Generate detailed charging cost exports for tax filing. For company EV drivers in Germany, this documentation supports your home charging deduction claim with accurate, session-level cost data.

Getting the most from your Fronius setup

The Fronius Wattpilot shines brightest when it is part of a complete Fronius solar system. The inverter tells the Wattpilot how much surplus power is available, and the Wattpilot adjusts charging power dynamically. LadeKosten captures this entire dance, giving you a complete financial picture.

Over time, you can analyze patterns: how much of your summer charging was essentially free from solar, how winter months shift the balance toward grid consumption, and whether adjusting your charging schedule could save money.

For Wattpilot owners who want to turn their charging data into clear cost insights, LadeKosten is the missing piece. Join the waitlist to be notified when the integration is ready for testing.