Smart solar optimisation in 60 seconds

Your battery should work out what to do on its own. Wonder Watt reads tomorrow’s solar forecast and your tariff prices, then tells your inverter when to charge, when to hold and when to sell.

No hardware. No Home Assistant. No schedules to babysit unless you want them.

Works with your system

Growatt, GivEnergy, Solax, AlphaESS, Solis and FoxESS hybrid inverters, all through the manufacturer’s own cloud.

Check your inverter

What you get

• Forecast-led charging so you stop paying for energy the sun was going to give you
• Octopus Agile cheapest slot selection, re-planned as prices are published
• Intelligent Octopus Go including the ad-hoc smart slots manual schedules always miss
• Conditional schedules built on state of charge, solar forecast and charge rate
• Axle export events so your battery earns money supporting the grid
• Wonder Batt full automation, currently in beta

Tariff integration

Wonder Watt reads your rates directly from Octopus, so your battery follows the tariff without you updating anything by hand.

Getting started

1. Click “Start free trial”
2. Sign in with Google
3. Connect your inverter
4. Leave it alone

Pricing

Free for 14 days, no payment details. After that, £6 per month billed every 3 months, or £4.50 per month on the annual plan.

Turn off automatic renewal whenever you like. Full refund, no quibble, within 7 days.

Full pricing details