Independent UK home energy monitoring
Wattlas Solar, battery, charging and electricity costs.
Wattlas brings compatible solar, battery, EV charger and tariff data into one clear view. Use one part of the system or several: see the energy you use, what it cost, and how the pieces fit together.
- Bring compatible energy accounts into one view
- See the real cost of each day on your tariff
- Understand solar, battery, grid and EV energy together
Where your energy goes
Follow every kWh, from source to use.
Generation is only half the story. Wattlas separates what powered your home, battery, car and export - so you can see the value of each kWh, not just the total your panels made.
How your energy was used
the line is your solar; above it came from the battery or grid
Of the 19.68 kWh the car took, 0 kWh came from your solar & battery and 19.68 kWh from the grid.
Why this exists
One view for energy that rarely lives in one app.
Your charger, tariff, battery and solar setup can all live in separate apps. With Plus, Wattlas brings compatible inverter, energy supplier and EV charger accounts together so you can trace the parts of your home energy setup that matter to you - without tying the answer to one manufacturer's view. The forecast comparison is there when you want an extra check on solar performance.
How it works
What feeds your estimate, and what Plus reads live.
Free builds your estimate from the four on the left. Plus adds a live read of your own system — your own inverter (covering your solar panels and battery), your own energy supplier, and your own EV charger — never a direct line to the hardware, and never anyone else's data but yours.
See it in action
A clearer picture of your home energy.
Today's estimate
Forecast generation for today, built from your system's spec and live weather — before a single kWh has actually been produced.
Estimate vs actual
34.87 kWh forecast vs 32.61 kWh actual — a 6.48% shortfall, flagged automatically the moment it happens.
Self-sufficient
Free never sees this number — it only exists once Plus is reading your real generation and consumption together.
Cost for this period
Real cost for the day, split by tariff band and export credit — not just a kWh total.
A common problem, solved
Accurate EV charging, whatever the wiring.
Setup asks one question — where is your charger wired? — and Wattlas gets every kWh attributed correctly either way, even when your charger and inverter don't talk to each other.
Grid side
The car uses grid power, or spare solar on its way to export — never the battery.
Home circuit
The battery can power the car, and the car draws on your solar alongside the house.
Compatibility
Built around the setup you already have.
Bring compatible energy accounts together without new hardware or rewiring. Start with the parts of your home energy setup that matter to you.
Solar & battery
Tesla Powerwall, SolarEdge and GivEnergy
Tariff
Octopus Energy, EDF Energy and E.ON Next
EV charging
Zappi, Ohme, Hypervolt and Easee
Free vs Plus
| Free £0 |
|---|
| Solar generation estimate and payback tools |
| Live weather forecast — no connection needed |
|
Plus
|
| Everything in Free, plus: |
| Connect compatible inverter, charger and tariff accounts |
| Map energy flows across your connected setup |
| Tariff-aware daily costs and energy breakdowns |
| Solar performance checks and alerts |
Start monitoring your home energy.
Solar, battery, car charging and energy tariff costs, all in Wattlas.
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