wonder watt
Power your tomorrow, today!
wonder watt
Power your tomorrow, today!
Set up your charge and export schedules once. Wonder Watt adjusts them every day around tomorrow's solar forecast and your tariff prices, and sends them to your inverter. Or let Wonder Batt plan the lot.
...In the last 4 weeks, I've earned 64% more for the electricity I exported than I would have received on fixed 12p outgoing...
...My export revenue has increased 70% on average... This has been a game changer for me...
Just completed my first month on Agile and have to say I'm pretty impressed - spent 60% less compared with roughly the same energy as last month on economy 7.
...Really delighted with [Wonder Batt] so far...
I use Wonder Watt and it's really good. Set and forget, pretty easy to use and working well with my GivEnergy set up.
...As someone who doesn't have the skills or knowledge to set up Home Assistant, it's been great to be able to manage my charging slots with just a few clicks of my mouse.
Wonder Batt plans your battery around your tariff, your solar forecast and how your home uses energy, then re-plans as the day changes. No schedules to set up.
New to Wonder Watt? Choose Wonder Batt when you set up. Already with us? Switch it on in the app. It starts with a dry run, so you see its plan before it touches your battery, and you press Go live when it looks sensible to you.
Early users report earning 64% and 70% more for the electricity they export.
Works with Growatt, GivEnergy, Solax, AlphaESS, Solis, FoxESS, Sunsynk, Deye and Sigenergy. See everything we work with.
Your charge schedules check tomorrow's solar forecast first, so you stop paying to fill a battery the sun was about to fill for free.
Within the charge windows you set, picks the cheapest Agile slots as prices come out, and charges in your Intelligent Go slots.
Export schedules that sell to the grid when you choose, and automatic exports during Axle grid events.
Paces charging to the window instead of running flat out, and never goes below the minimum you set.
A web app for your phone or computer. No Home Assistant, no Raspberry Pi, no home server.
Fully hands-off: plans your battery 48 hours ahead with no schedules to set up. Now open to everyone. See how it works.
Then from £4.50 a month, or from £5.41 a month from 1 December 2026. No payment details to start. Cancel renewal any time.