sonnen is a German maker of sonnenBatterie home energy storage, based in Wildpoldsried in the Allgaeu. Batteries are monitored through the sonnen app, which also covers connected PV systems, EV chargers and sonnen energy contracts. Shell bought sonnen in 2019 and sold it to the investment group TIVEN in 2026.
sonnen batteries sit on the home network, and the pages we read show integrations reaching the battery over its local address. openHAB, evcc and community Home Assistant and Homey apps use a local API, with a token and a Write API switch in the battery's web interface for control. The sonnen app is the official way to view and manage the system, and we found no Alexa, Google Home, Apple Home or Matter support.
That suits owners who want to bring battery data into an energy dashboard or an EV charging controller. It is weaker for voice control and ecosystem integration. Company status is also a consideration: sonnen GmbH in Germany filed for insolvency on 22 October 2026, and reports say it intends to keep supporting more than 150,000 customers, while sonnen USA said its business was growing. We could not confirm how app and service support will be handled.
Connection
Battery on the home network, plus the sonnen app
Voice assistants
Not found
Matter
Not found
Open platforms
Local API, openHAB, evcc; community Homey and Home Assistant
What can be connected
Battery storage sonnenHome battery storage systems; sonnen's US site also names sonnen Core+, sonnenEvo and ecoLinx 100
Solar and EV Connected PV systems and EV charging stations (wallboxes)
Energy contracts sonnen energy contracts such as EnergyFix, EnergyDynamic and sonnenFlat
The current customer app, published by sonnen GmbH. It shows how the home is supplied, live energy flow, real-time and historical consumption and generation, battery, PV and EV charger performance, and energy contract details. It also lets users set a battery reserve for outages, with simple or professional display modes. The App Store listing says it is a gateway to the sonnenCommunity and names sonnen Partner and sonnenPro as related apps. The Android link comes from sonnen's US site.
Named as related sonnen apps on the sonnen App Store listing. We did not open them, so we could not confirm who they are for or whether customers can use them.
Compatibility, platform by platform
Official supported by the brandCommunity built by someone elseNot found searched, nothing foundUnconfirmed sources conflict or could not be opened
Platform
Status
What it means
Sources
Connection
Local network (LAN)
Yes
Integrations reach the battery by its IP address on the home network. openHAB needs the battery's local IP, and evcc uses a host and port (default 8080). The openHAB page says the V2 API documentation is on the battery itself. We did not find sonnen's own page saying whether the battery connects by Ethernet or Wi-Fi.
The sonnen app shows live and historical data from anywhere, according to its listing. We did not find sonnen documentation describing how the app reaches the battery.
No sonnen integration turned up in the pages we read. We did not run a dedicated search.
Searched, no source
sonnenCommunity
Not mentioned
The sonnen app is described as a gateway to the sonnenCommunity, which Wikipedia says was organised from early 2016 so members could share surplus solar power. We did not confirm what the community offers today, and ownership has changed since.
We found a community custom integration, Sonnenbatterie, discussed on Home Assistant's forum and hosted on a user's GitHub account. It appears to use the battery's local REST status API, and users report entities freezing or becoming unavailable. We could not open Home Assistant's own integrations page, so we could not confirm whether a built-in integration exists.
A Sonnen Batterie app on Homey's store is listed for Homey Cloud, Pro, Pro mini and Self-Hosted Server and needs Homey v12.9.0 or newer. It creates battery, grid, household and solar panel devices over the LAN, needs a Homey Bridge, and needs the Write API enabled for schedule or mode changes. Its contributors and GitHub repository are independent, and we found no sign that sonnen GmbH publishes it.
A sonnen binding is in openHAB's add-on list, maintained by the openHAB project. It reads battery level, power flows and totals over the local network. The V1 API is deprecated, and V2 needs a token. Grid charge and discharge control needs the Write API enabled and manual operation mode. Tested models are the sonnen eco 8.0 and eco 9.43.
evcc, an open-source EV charging controller, documents a sonnenBatterie template as a grid, PV or battery meter by host and port. Active control needs the JSON Write API enabled under Software Integration and a token. evcc overwrites any backup buffer set in the battery's interface. We found no sign that sonnen maintains the template.
Sonnen Buddy is an independent iPhone and iPad app by Daniel Andersen that offers more detailed real-time energy flow, charge schedules and operating mode changes through the battery's built-in API. The listing says it needs access to the battery directly or through a VPN, with a premium tier.
No plugin found in the pages we read. We did not run a dedicated search.
Searched, no source
Control4
Unconfirmed
No driver found in the pages we read. We did not run a dedicated search.
Searched, no source
IFTTT
Unconfirmed
No sonnen service found in the pages we read. We could not confirm either way.
Searched, no source
sonnen local API
Official
The battery has a built-in JSON REST API. A setting under Software Integration enables the Read and Write API and creates a token, and the V2 documentation is served from the battery at /api/doc.html. One third-party guide for Gen 8 or higher batteries says reaching the web interface uses an installer login, which is restricted to installers or sonnen support. We did not find a sonnen-published developer page.
Checked 11 November 2026 against the brand's own pages, app store listings and each project's own page. “Not found” means we searched and found nothing, not that it is impossible. Compatibility changes often. Spot an error? Tell us and we will fix it.
Common questions about sonnen
Does sonnen support Matter?
Unconfirmed. We found no sonnen Matter announcement or product in the pages we read. We did not run a dedicated Matter search.
Does sonnen work with Alexa?
Unconfirmed. Not mentioned on the sonnen app listings or US app page we read. We could not confirm either way.
Does sonnen work with Google Home?
Unconfirmed. Not mentioned on the sonnen app listings or US app page we read. We could not confirm either way.
Does sonnen work with Apple Home (HomeKit)?
Unconfirmed. Not mentioned on the sonnen app listings we read. We could not confirm either way.
Does sonnen work with Home Assistant?
Yes, through a community-built integration. We found a community custom integration, Sonnenbatterie, discussed on Home Assistant's forum and hosted on a user's GitHub account. It appears to use the battery's local REST status API, and users report entities freezing or becoming unavailable. We could not open Home Assistant's own integrations page, so we could not confirm whether a built-in integration exists.
Does sonnen work with SmartThings?
Unconfirmed. No sonnen integration turned up in the pages we read. We did not run a dedicated search.
Does sonnen work with Homey?
Yes, through a community-built integration. A Sonnen Batterie app on Homey's store is listed for Homey Cloud, Pro, Pro mini and Self-Hosted Server and needs Homey v12.9.0 or newer. It creates battery, grid, household and solar panel devices over the LAN, needs a Homey Bridge, and needs the Write API enabled for schedule or mode changes. Its contributors and GitHub repository are independent, and we found no sign that sonnen GmbH publishes it.
Does sonnen work with Hubitat?
Unconfirmed. No driver found in the pages we read. We did not run a dedicated search.
Answers come from the sourced table above. See how sonnen compares with all brands on the smart home brand statistics page.