Update SUN calculations after prolonged shutdown

dday · September 23, 2023, 2:33am

I run HA in a location where power is turned off for several days at a time. When HA boots the time is off by several days. So, all of the automations that work off of sunset do not function till the next day. When I restore power, I tether a phone for internet, so it takes some time to get the correct time. I have been trying to figure out how I get the sun calculations to update bit have not had success. The only thing I have found was to restart HA once the time is updated. Is there any way to automate the restart or fix the calculations? I was thinking of using elevation of sun but that does not get updated after powerup.

parautenbach · September 23, 2023, 4:33am

What hardware are you running on? The BIOS will usually keep the time, unless the BIOS battery is flat or you’re running a PI that doesn’t have one. If the latter, you should be able to force NTP to have updated before HA starts (depending on the HA installation method you’ve used).

dday · September 23, 2023, 10:41pm

I am running on a RPi4. That is a good thought to delay the startup or maybe even better to add a RTC that would simplify things.

dday · September 23, 2023, 11:29pm

I am using the HA OS distribution. I could not find a way to do either of these choices so back to original question.

parautenbach · September 24, 2023, 5:13am

It’s a bit hard to confirm (and I don’t use HAOS), but it seems it needs NTP to boot already. You can check and change the NTP settings if needed, it seems.

github.com

home-assistant/operating-system/blob/329caf6c1c0b6267146bd39199ccf62c387784c0/Documentation/configuration.md

# Configuration

## Automatic

You can use an USB drive with HassOS to configure network options, SSH access to the host and to install updates.
Format a USB stick with FAT32/EXT4/NTFS and name it `CONFIG` (in all capitals). Alternative you can create a `CONFIG` folder inside boot partition. Use the following directory structure within the USB drive:

```text
network/
modules/
modprobe/
udev/
authorized_keys
timesyncd.conf
hassos-xy.raucb
```

- The `network` folder can contain any kind of NetworkManager connection files. For more information see [Network][network.md].
- The `modules` folder is for modules-load configuration files.
- The `modprobe` folder is for modules configuration files (/etc/modprobe.d)

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nickrout · September 24, 2023, 6:04am

I suspect your pi is coming up before your tethered internet is available. Therefore the pi can’t set it’s time when it starts.

You could try an automation that runs, say, 2 minutes after a restart and reloads the sun device.

Action would be like:

service: homeassistant.reload_config_entry
data: {}
target:
  device_id: 75aec5f18d9496933b82c5688da2105c

parautenbach · September 24, 2023, 7:08am

Could be and thus it can’t set the time.

dday · September 24, 2023, 2:27pm

Yes, that totally is the normal sequence internet is up after the router boots. That is what I was looking for I am thinking that I can check for internet access and then reload then call the service to reload the configuration. Thanks for the help I recently switched from hubitat to HA and it is quite a diverse platform. I have already triggered that service and saw it recalculate the times so I think it will work thanks!