From 4558416c012bae2ee9789cd7dadc36f5ef252383 Mon Sep 17 00:00:00 2001 From: farmio Date: Sat, 5 Sep 2026 17:00:03 +0200 Subject: [PATCH 1/3] Document the Fronius Modbus setpoint fallback period --- source/_integrations/fronius.markdown | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/source/_integrations/fronius.markdown b/source/_integrations/fronius.markdown index 2cffb51cfa77..ac1a997bbfa6 100644 --- a/source/_integrations/fronius.markdown +++ b/source/_integrations/fronius.markdown @@ -175,6 +175,14 @@ Depending on the inverter's firmware, an `AC power limit` below `10 %` may force On a hybrid inverter, the `AC power limit` does not restrict **charging** the battery. Charging is not AC output. Surplus photovoltaic power goes into the battery instead of being wasted, which makes the limit useful for peak shaving. **Discharging** does count against it, because that power leaves the inverter on AC. +#### Falling back to the inverter's own settings + +A setpoint stays on the inverter until it is changed, including while Home Assistant is shut down or unreachable. To have the inverter recover on its own instead, turn on **Revert the AC power limit if Home Assistant stops**: go to **Settings** > **Devices & services**, select the Fronius integration, and choose **Configure**. + +The inverter then drops the `AC power limit` an hour after it last received it, and hands control back to its own priority list. Home Assistant sends the limit again every 15 minutes, so the hour only ever runs out once Home Assistant has really stopped - a restart or a short outage has plenty of room. An inverter held at `30 %` runs unrestricted an hour after the Home Assistant host dies. + +This applies to the `AC power limit` only. Fronius documents no timeout for the battery setpoints, so those keep their value and switch state whatever happens to Home Assistant. + #### The battery limits are power, not a charge level `Battery charge power limit` limits charging _power_. It is not a "charge to 80 %" setting. The inverter exposes no maximum state of charge over Modbus at all; only the minimum reserve. From 5996a7c2a7f7ee1c6ce3b822afd88feb1fb63585 Mon Sep 17 00:00:00 2001 From: farmio Date: Sat, 5 Sep 2026 18:38:44 +0200 Subject: [PATCH 2/3] Say that removing the integration leaves the limit behind too --- source/_integrations/fronius.markdown | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/source/_integrations/fronius.markdown b/source/_integrations/fronius.markdown index ac1a997bbfa6..9ca942e2f540 100644 --- a/source/_integrations/fronius.markdown +++ b/source/_integrations/fronius.markdown @@ -177,7 +177,7 @@ On a hybrid inverter, the `AC power limit` does not restrict **charging** the ba #### Falling back to the inverter's own settings -A setpoint stays on the inverter until it is changed, including while Home Assistant is shut down or unreachable. To have the inverter recover on its own instead, turn on **Revert the AC power limit if Home Assistant stops**: go to **Settings** > **Devices & services**, select the Fronius integration, and choose **Configure**. +A setpoint stays on the inverter until it is changed, including while Home Assistant is shut down or unreachable. Removing the integration leaves it behind as well, with nothing left to take it back. To have the inverter recover on its own instead, turn on **Revert the AC power limit if Home Assistant stops**: go to **Settings** > **Devices & services**, select the Fronius integration, and choose **Configure**. The inverter then drops the `AC power limit` an hour after it last received it, and hands control back to its own priority list. Home Assistant sends the limit again every 15 minutes, so the hour only ever runs out once Home Assistant has really stopped - a restart or a short outage has plenty of room. An inverter held at `30 %` runs unrestricted an hour after the Home Assistant host dies. From a1adf0f08399bf007da8b36599e58f639c5ed7ac Mon Sep 17 00:00:00 2001 From: farmio Date: Sat, 5 Sep 2026 18:57:20 +0200 Subject: [PATCH 3/3] Say where the Fronius fallback setting lives --- source/_integrations/fronius.markdown | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/source/_integrations/fronius.markdown b/source/_integrations/fronius.markdown index 9ca942e2f540..2643b90e4a0a 100644 --- a/source/_integrations/fronius.markdown +++ b/source/_integrations/fronius.markdown @@ -66,6 +66,10 @@ Modbus port: description: "The port of the device's Modbus TCP interface. Only used when Modbus is enabled on the device, see [Modbus TCP](#modbus-tcp). The default is `502`." required: false type: integer +Revert the AC power limit if Home Assistant stops: + description: "Whether the inverter should give up a power limit set by Home Assistant when it stops hearing it, see [Falling back to the inverter's own settings](#falling-back-to-the-inverters-own-settings). Off by default." + required: false + type: boolean {% endconfiguration_basic %} ## Monitored data @@ -177,7 +181,7 @@ On a hybrid inverter, the `AC power limit` does not restrict **charging** the ba #### Falling back to the inverter's own settings -A setpoint stays on the inverter until it is changed, including while Home Assistant is shut down or unreachable. Removing the integration leaves it behind as well, with nothing left to take it back. To have the inverter recover on its own instead, turn on **Revert the AC power limit if Home Assistant stops**: go to **Settings** > **Devices & services**, select the Fronius integration, and choose **Configure**. +A setpoint stays on the inverter until it is changed, including while Home Assistant is shut down or unreachable. Removing the integration leaves it behind as well, with nothing left to take it back. To have the inverter recover on its own instead, turn on **Revert the AC power limit if Home Assistant stops**. It is offered when the integration is set up, and can be changed later: go to **Settings** > **Devices & services** > **Fronius**, select the three dots menu {% icon "mdi:dots-vertical" %} next to the entry, and choose **Reconfigure**. The inverter then drops the `AC power limit` an hour after it last received it, and hands control back to its own priority list. Home Assistant sends the limit again every 15 minutes, so the hour only ever runs out once Home Assistant has really stopped - a restart or a short outage has plenty of room. An inverter held at `30 %` runs unrestricted an hour after the Home Assistant host dies.