Hi
thinking about using the Multiplus as a “Computer UPS”. While it seems possible to turn of the computer via mk3-usb and a little python (or maybe the experimantal nut driver), I am wondering how I could realise the power on.
Is there a trick/way to configure the inverter output to bounce once the batteries were below 20% and grid comes back online again ? just studying the manuals didnt reveal an option to do so.
thanks
With the relay assistant in VeConfigure you can switch a relay on and off depending on SOC
Can you elaborate on the logic please.
Let’s say I would powerdown the PC with a SOC < 20
Then have the assistant triggering the relay <19 and > 20
There would be a race condition for hours between 20…19 ?
I might miss your point.
I have done something similar. If you get a gx device or a Raspberry PI running the Venus OS you can use wake on lan to turn the PC off and back on again using node-red. You can use whatever logic you want. I was using low-voltage. You can also ping the machine to see if it’s on and resend the packet. This is the node-red palette for WOL.
@trosenda
With the assistant you can trigger on one condition. Use two assistant to build up hysteresis to avoid flipping states:
With a GX device and Venus OS Large including Node Red you are more flexible.
Your PCs BIOS will very likely have a setting to turn on when AC power is restored.
An example of the setting below.
Thanks. But that would lead to the problematic situation.
the time between pc shutdown and SOC < 20% could be hours long
I have the exactly the AC loss/Power on setting, but need a way to bounce the output of the Multiplus to trigger.
That can be done with a simple NodeRed flow. I have an example I could share later if needed.
I’m wondering how to run nodered when the power is gone, but would be interested in the logic for sure !
You could try a little switch, powered by the Multi in combination with the “power on LAN Function”
for the wake up function …
NodeRed runs on a GX device (Cerbo, Ekrano) which takes a DC power supply from whatever batteries you are using. So the control system and logic runs regardless of mains power.
Example of a manual power cycle of the AC output.
Thanks for the replies !
that looks all a little a bit complex for a simple task.
Unfortunately my device didnt arrive yet, but I hope I can start playing with it on the weekend.
right now, I have two options in mind:
use assistant to trigger the alarm relay after 60 seconds AC and release it after 61seconds. would wire the relay to the power switch of the pc. OS would ignore the button, but if the device is turned of, it would be turned on.
use an arduino “in parallel”…1 input watching the ac input, another input watching the alarm output. using one output to bounce the inverter with the help of an external relais. the logic could be done with a few lines of code.
