# \[APP\]\[Pro\] Atmoce – solar, battery and grid, locally

**URL:** <https://community.homey.app/t/app-pro-atmoce-solar-battery-and-grid-locally/160425>\
**Category:** Apps\
**Created:** [October 6, 2026, 8:35am UTC](https://community.homey.app/t/app-pro-atmoce-solar-battery-and-grid-locally/160425 "2026-10-06T08:35:33Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Goossens](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/goossens/32/172342_2.png) [@Goossens](https://community.homey.app/u/Goossens)\
**Post date:** [October 6, 2026, 8:35am UTC](https://community.homey.app/t/app-pro-atmoce-solar-battery-and-grid-locally/160425/1 "2026-10-06T08:35:33Z")

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Hi all, I made an app for **Atmoce** solar and battery systems (M-Combiner MC100 / MC100-T, M-Gateway MG100). Homey talks to the gateway on your own network over Atmoce’s official Modbus TCP interface, without the cloud.

**What you get**

- Solar panels, home battery and grid meter in Homey Energy
- Battery control from Flows: charge or discharge at X W, to a level or for N minutes, and limits for charging, discharging, export, import and solar production
- Solar surplus cards, to start appliances when there is power to spare (battery first)
- An _Energy flow_ dashboard widget
- Timeline messages for faults, grid outages and gateway firmware updates

**Quick start**

1. Atmozen app → _Settings → 3rd Party System_ → turn on **Modbus-TCP**.
2. Homey → _Devices → + → Atmoce_: add the solar panels, battery and grid meter. Homey finds the gateway by itself.
3. Want Homey to charge the battery **from the grid**? Atmozen → _Battery working mode_ → turn on **Grid recharging**. Without it, the battery only charges from the sun, whatever Homey asks. The power you set there is a ceiling.
4. Discharging **into the grid** needs **Export power to grid** in the same screen.
5. Homey Energy: keep the Atmoce grid meter as your only main meter. Exclude other meters (Linky, P1) from the total.

The MC100L (Lite) has no local interface and is not supported.

[App Store](https://homey.app/a/com.goossens.atmoce) · [GitHub](https://github.com/jogoossens/com.goossens.atmoce) (issues welcome). Questions and ideas are welcome here too.