Wattlas

Your solar, battery, EV charger, and energy tariff — tracked together, in one place, instead of four different apps that don't talk to each other.

See exactly where your money goes
Real cost for every period, split by tariff band and export credit — not just a kWh total. Track payback progress against what your system actually cost to install, and see your self-sufficiency %: how much of today's electricity came from your own panels and battery rather than the grid.

EV charging, handled properly
Setup asks one question — is your charger wired on the grid side or the home circuit? — and every kWh gets attributed correctly either way, even when your charger and inverter don't talk to each other. On a smart EV tariff with time-of-use dispatch windows, Wattlas tracks them and shows what actually charged the car during cheap-rate periods versus what didn't.

One app for your whole setup
Connect the accounts you already have (others coming soon):
• Inverters & batteries: SolarEdge, GivEnergy (cloud or local GivTCP), Tesla Powerwall, Enphase
• EV chargers: myenergi Zappi, Ohme, Hypervolt, Easee
• Energy tariffs: Octopus Energy

Every array in a multi-panel system gets its own orientation, tilt, and capacity, so mixed-orientation installs are modelled properly rather than averaged into one number.

Know before your bill tells you
A live weather-based forecast means Wattlas can flag underperformance — a shaded panel, a failing string, an inverter fault — the moment it happens, with a push notification straight to your phone, instead of you noticing a vague dip months later.

Built for a household, not just one login
Share access with another adult in your home. The app follows your phone's light/dark theme automatically, with a live sky animation reflecting your actual local weather.

Your data, on your own terms
Wattlas is built independently of any single inverter, battery, or charger manufacturer — no one company owns it or decides what it tells you. It never connects directly to your hardware, only to your own account with the manufacturer, and you can delete your account and everything in it at any time, directly from the app.

Free to start. A paid Plus tier unlocks the live reads from your own inverter, battery, EV charger, and tariff account.