Maximize your solar savings with intelligent power balancing for owner-authorized cloud solar batteries and EV chargers. Wattion stops inverter clipping, protects stored solar while the car charges, and imports cheap overnight electricity on short winter days.
Keep the savings
£50+
Unlimited
£2.99/month
Unlimited savings
Unlimited savings for £2.99/month
Free plan
Up to £10.00
of savings each month
Free plan: up to £10.00 of savings
A live home, last 30 days
FoxESS battery and Ohme charger
These are conservative dashboard totals from a real Wattion household. Extra solar is valued at the export rate. Battery kept off the EV is valued at avoided import, with leftover stored energy at export.
Total saved
£39.84
Over the clipping amount
107.45 kWh
Extra generation captured by making room in the battery
Extra generation value
£12.89
What that extra solar is worth at your export rate
Discharge prevented
236.31 kWh
Home battery energy kept off the EV charger
Battery protection value
£26.95
£9.27 avoided import · £17.68 leftover at export
Savings vary with solar, driving, and tariff. This is one home, not an average or a promise.
Seamlessly integrate with leading solar and EV charging hardware for optimal energy management.
Schedule control
Sign in with FoxESS or paste a Cloud API key to control schedules and protect EV charging.
Owners can generate an API key in FoxESS Cloud. No vendor partnership is required.
Schedule control
Connect with a GivEnergy Cloud API token and inverter serial to apply timed charge and discharge.
Owners can create a token in GivEnergy Cloud. Premium is required. GivEnergy Ltd entered administration in 2026; the Cloud API remains the documented owner integration.
Monitoring
Connect with OpenAPI AppID, AppSecret, and system serial for live monitoring.
Owners can self-register on the AlphaESS Open Platform. Wattion can monitor AlphaESS systems; public OpenAPI does not expose Wattion schedule or forced-discharge control.
Smart EV charging
Connect with your Ohme account email and password to pause charging during battery discharge.
Owners can connect with the same Ohme account used in the Ohme app.
Smart EV charging
Connect with a GivEnergy Cloud API token to pause and resume the GivEnergy EV charger.
Owners can create a token in GivEnergy Cloud. Pause/resume uses the documented stop-charge and start-charge commands.
No extra hardware
Predbat is excellent if you already run Home Assistant. It usually lives on a Raspberry Pi or another always-on computer in your house, plus inverter integrations and YAML. Wattion is the same class of battery and EV coordination as a cloud login — FoxESS, GivEnergy, and Ohme over the internet. Nothing extra to buy, flash, or keep online.
A local smart-home platform. Powerful, and it needs a computer that stays on — usually a Raspberry Pi.
The leading DIY battery planner. It runs on Home Assistant and is superb if you already have that stack.
Cloud control for FoxESS, GivEnergy, and Ohme. No Pi, no Home Assistant, no extra box.
Extra hardware
Wattion
None. Your inverter and charger already have cloud APIs.
Home Assistant + Predbat
An always-on host — typically a Raspberry Pi, NUC, or Home Assistant Green.
Setup
Wattion
Sign in and connect FoxESS or GivEnergy, plus Ohme if you have a car charger.
Home Assistant + Predbat
Install Home Assistant, an inverter integration, Predbat, forecasts, and YAML.
Who keeps it running
Wattion
Wattion hosts the controller and writes schedules about every ten minutes.
Home Assistant + Predbat
You maintain the box, Home Assistant updates, add-ons, and SD cards.
Best for
Wattion
FoxESS or GivEnergy homes that want clip-saving and EV protection without a home lab.
Home Assistant + Predbat
People who already run Home Assistant and want full DIY control of the house.
Home Assistant and Predbat remain the right choice if you want a full local smart home. Wattion is for households that want clip-saving and EV battery protection without standing up a home lab.
Solar clip-saving
Oversized solar arrays often produce more DC power than the inverter can convert. When the battery is already full, that surplus is lost as heat — inverter clipping. Wattion watches the forecast, makes room in the pack before midday, and stores energy that would otherwise never reach the house or the grid.
Forecasts inverter clipping from weather and your array, inverter, and battery size
Pre-discharges the home battery before the sun peaks so surplus DC can be stored
Values that extra production at your export rate instead of letting it go to waste
An almost perfect solar curve
FoxESS Cloud · same home as the 30-day totals
When the battery still has room at peak sun, FoxESS records a smooth solar bell instead of a clipped AC plateau. At 10:40 this home made 6.70 kW of solar — 0.58 kW into the pack and 5.90 kW exported.
Solar
6.70 kW
Battery charge · 10:40
0.58 kW
Grid export
5.90 kW
One sunny August day from the same FoxESS home as the 30-day totals. Clipping still happens when the pack is full.
Built for fixed-cost charging tariffs and off-peak tariffs. Wattion captures clipped solar, protects stored energy while the car charges, and imports cheap overnight electricity when winter sun cannot cover the house.
Forecasts inverter clipping from weather and your array, inverter, and battery size. Pre-discharges the home battery before the sun peaks so surplus DC can be stored. Values that extra production at your export rate instead of letting it go to waste.
Prevents EV charging from using home battery charge. Allows excess solar when the battery is full to be used by EV charging.
Built for fixed-cost charging tariffs and off-peak tariffs. Wattion stops the battery feeding the EV, and fills it overnight on cheap electricity when winter sun cannot cover the home.
Set it and forget it. Our system continuously monitors your energy usage and automatically adjusts charging patterns for optimal efficiency.
Prioritize using your own solar generation and stored battery power before drawing from the grid, reducing your carbon footprint.
Track your energy generation, consumption, and savings in real-time with our intuitive dashboard and detailed analytics.
Connects over owner-authorized cloud APIs for the hardware listed above. No Raspberry Pi, Home Assistant box, or extra hardware.
FAQ
No extra box, two plans, and the same conservative savings rules as the dashboard.
No. Wattion talks to FoxESS, GivEnergy, and Ohme over the cloud. You do not need a Raspberry Pi, a Home Assistant box, or another always-on computer in the house.
A supported cloud inverter — FoxESS or GivEnergy for schedule control, AlphaESS for monitoring — and optionally an Ohme or GivEnergy EV charger. The inverter and charger you already own are enough.
If you already run Home Assistant, Predbat is the usual DIY path — a Raspberry Pi, inverter integrations, and YAML. Wattion is the same class of battery and EV coordination as a cloud login. Home Assistant and Predbat remain the right choice if you want a full local smart home. Wattion is for households that want clip-saving and EV battery protection without standing up a home lab.
Free includes up to £10.00 of savings each month. Unlimited is £2.99/month and keeps every saving. Free pauses clip-saving and battery control for the rest of the month after the allowance.
These are conservative dashboard totals from a real Wattion household. Extra solar is valued at the export rate. Battery kept off the EV is valued at avoided import, with leftover stored energy at export. Savings vary with solar, driving, and tariff. This is one home, not an average or a promise.
Oversized solar arrays often produce more DC power than the inverter can convert. When the battery is already full, that surplus is lost as heat — inverter clipping. Wattion watches the forecast, makes room in the pack before midday, and stores energy that would otherwise never reach the house or the grid.
Prevents EV charging from using home battery charge. Allows excess solar when the battery is full to be used by EV charging. When the car starts charging, Wattion writes a short battery schedule so stored solar is not dumped into the EV.
No. Wattion is built for fixed-cost charging tariffs and off-peak tariffs, including Octopus Intelligent-style homes. A cheap overnight window and a supported inverter — plus a charger if you have an EV — is enough.
Yes. You can pause car-charging management in Settings without removing credentials. Unlimited can be cancelled any time from Manage subscription.
Still stuck? Email hello@wattion.app
Try free. Go unlimited when Wattion is finding the savings.