Supported inverters

Wonder Watt supports six inverter brands: Growatt, GivEnergy, Solax, AlphaESS, Solis and FoxESS.

Every integration works through the manufacturer’s own cloud API. There is no extra hardware to buy, nothing to install at your property, and no Home Assistant or home server required. If your system is already reporting to the manufacturer’s app, Wonder Watt can work with it.

At a glance

Solis and FoxESS are our two newest integrations, and both launched with the full feature set rather than a cut down version. If anything behaves differently on your system, tell us in the community forums.

What works with each brand

Growatt

Our first integration, live since 2023 and the most widely used. Confirmed working across the SPH and MIN hybrid ranges, MOD series, and all BMS versions we have seen. AC coupled systems are supported.

Read the original Growatt launch post, or our guide to using the Growatt app to maximise an export tariff.

GivEnergy

Confirmed working across All in One units, Gen 1, Gen 2 and Gen 3 hybrid inverters, and both AC and DC coupled systems, at all battery capacities. GivEnergy users also get automatic reversion to Eco mode after a grid export, which is one of the features our users mention most often.

See the GivEnergy launch post.

Solax

Confirmed working on X1 and X3 Hybrid Gen4 inverters, with Triple Power and high voltage batteries. Other Solax variants are likely to be compatible.

See the Solax launch post.

AlphaESS

Confirmed working across the SMILE-G3 and SMILE-B3 series and Storion-T models, at all capacities.

Solis

New. Solis hybrid inverters are supported through the SolisCloud API.

FoxESS

New. FoxESS hybrid systems are supported through the FoxESS Cloud open API.

Frequently asked questions

Does Wonder Watt work with my inverter?

If you own a Growatt, GivEnergy, Solax, AlphaESS, Solis or FoxESS hybrid inverter with battery storage, yes. Sign up for the free 14 day trial and connect your system in a couple of minutes to confirm.

Do I need Home Assistant, a Raspberry Pi or a home server?

No. Wonder Watt is a hosted web app that talks to your inverter through the manufacturer’s cloud. You need a browser and a Google account to sign in, and that is the entire setup. Nothing runs at your house and there is nothing to maintain.

Do I need to be technical to use it?

No. Connect your system, configure some schedules, and let it run.

Which smart tariffs are supported?

Octopus Agile and Intelligent Octopus Go have dedicated integrations, and fixed time of use tariffs such as Economy 7, Octopus Go and Octopus Flux are all straightforward to schedule against. See our Agile Octopus guide and our Intelligent Octopus Go integration.

Why do you not support more brands?

Because most inverter manufacturers do not publish a documented cloud API that allows a third party to send control instructions. Reading data is usually possible. Writing schedules and charge commands very often is not, and without that there is no automation to offer.

If you are shopping for a system, ask the manufacturer whether they offer a public, documented cloud API with control endpoints before you buy. It is the single question that determines whether your battery will ever be genuinely smart.

Can you add support for my inverter?

Tell us which one in the community forums. Demand shapes our roadmap, and if the manufacturer has a workable control API then it goes on the list. Solis and FoxESS both got built because users kept asking.

How much does it cost?

There is a free 14 day trial with no payment details required. Current subscription pricing is on our subscription model page.

Read the six brand announcement, take a look at our service dashboard, or see what existing users say in our testimonials.