# \[App\]\[Pro\] Homey EMS (HEMS): Smart EMS

**URL:** <https://community.homey.app/t/app-pro-homey-ems-hems-smart-ems/156015>\
**Category:** Apps\
**Tags:** app, homey-pro\
**Created:** [June 10, 2026, 5:06pm UTC](https://community.homey.app/t/app-pro-homey-ems-hems-smart-ems/156015 "2026-06-10T17:06:51Z")\
**Posts on this page:** 1\
**Showing post:** 6

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**Author:** ![Kaoh](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/kaoh/32/9283_2.png) [@Kaoh](https://community.homey.app/u/Kaoh)\
**Post date:** [June 14, 2026, 5:46pm UTC](https://community.homey.app/t/app-pro-homey-ems-hems-smart-ems/156015/6 "2026-06-14T17:46:19Z")

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# Grid Aware EMS — quick start checklist

## 1. Make sure your battery can be controlled

- Your battery’s Homey app must accept a power setpoint (`target_power`): **positive = charge, negative = discharge**.
- In the pairing wizard, pick the battery mode Homey uses to control it ( **“homey”** ) and the mode where the battery follows your usage by itself ( **“anti-feed”** / self-consumption), or leave that to the app (often responds faster).

## 2. Link the devices (pairing wizard)

- **Required:** P1 / smart meter and solar inverter.
- **Recommended:**
  - home battery
  - EV charger + car (for SOC and at-home status)
  - solar forecast device
  - weather forecast
  - price device (or Homey Energy prices, but those are less accurate and reliable)

> Without the forecast and price devices, Grid Aware still works, but it can’t plan ahead.

## 3. Fill in the settings that matter

- **Battery usable capacity (kWh)** — the real value, not the default 10. All planning is based on this number.
- **Battery maximum charge power (W)** — your battery’s hardware limit.
- **Battery reserve (minimum SOC)** — the battery never discharges below this.
- **EV** — charger minimum and maximum amps, EV battery capacity, and whether 3-phase is allowed.
- **Run the day plan automatically** — turn it on, or create a flow with your own schedule. The day plan decides each night how full the battery should be and whether it needs a top-up from the grid.

## 4. Test first, then go live

- **Test run** is on by default. In Test run the app only shows what it _would_ do on the device tile (“Charging EV from solar”, “Topping up battery”).
- Watch one sunny day. Does what it shows make sense?
- Then turn **Test run off** , and the app takes control.

## 5. Tell it about your car (flows)

- **EV at home / away** — an action card driven by your car’s location or the charger’s plug status.
- **EV needed tomorrow** — night charging only happens when this is set.
- **Set EV target SOC** — how full the car must be for tomorrow.

## 6. Day to day

- **Surplus** (what is left after the house’s own consumption) goes to the **car first** , then the **battery**. When needed, it balances between the two so the battery still reaches its target to cover the evening.
- In **expensive hours** , the battery covers your usage.
- The **force buttons** (charge battery now, charge EV now) override the plan. Press them again to stop.
- The tile always shows in one line **what it’s doing and why**. Check that first when something looks wrong.

## Not working as expected?

| What you see | Cause |
| --- | --- |
| Battery does the opposite of what the tile says | The sign is wrong in the battery app (report it to the battery app developer) |
| Battery dropdowns are empty in the wizard | Your battery’s app is read-only and can’t be controlled (ask the battery app developer to support the `target_power` and `target_power_mode` capabilities) |
| Still stuck | Post a screenshot of the tile plus the app log in the forum thread |

_The advanced settings (BOOST, battery priority, start/stop delays, expensive-hours blocking) work fine on their defaults for a start._

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_[View the full topic](https://community.homey.app/t/app-pro-homey-ems-hems-smart-ems/156015)._