Yes, you can insert a tag into the value field. Search for your variable in tag list.
Hi Ronny. I know how to use a tag. But can i adjust the value of a tag with a separate flow?
It’s still a bit unclear what you’d like to achieve, but I think you mix up tags and variables.
Users can only edit values of variables, by flows or by direct edit (variables = tags you created yourself).
Tags are read-only “variables” provided and managed by apps & devices, users cannot edit those.
(Well, except for tags generated by the advanced virtual device, because that’s a user created and editable device).
Install this Better Logic Library App for Homey | Homey
Then you can use the first flow to write to a variable and use that in another flow.
Hi Ronny,
I guess I have to explain better what I’am looking for.
To control our AlphaESS battery I have created a few flows.
FOR EXAMPLE:
Discharging
Set register 1000 to 3 ( activate modbus control)
Set register 1005 to 10 ( minimum powerlevel battery )
Set register 1006 t0 3000 ( Time in seconds for this action )
Set register 2000 to 7000 ( discharge-power in watt)
Set register 3000 to 4 ( pv power directly to grid)
I prefer to replace ‘value 10’ /register 1005 by a value of a variabele.
So if discharging is activated on a cloudy day it will be set to 50 instead of 10. So half of battery can be used for our own powerconsumption.
Because I have to set multiple registers for every possible workflow it means I have to configer for each case a complete flow.
If it is possible to use a variabele I can use the same flow for discharging with only adjustment of the variables I need.
Maybe it is already possible but unitil now i can not find or/how.
Kind regards
Hi, got it now (I hope) 
What you are searching for is standard functionality of AdvancedFlow.
Add one of these WHEN cards to your flow:
This tag will be your input parameter.
Example: A flow with input parameter for min SoC %.
The start button allows to start the flow without a parameter (from Flow list, from Dashboard). Set a default value instead.
To use your flow, use this cards:
You can use this cars like any other THEN card:
Select your flow and insert a value. Use a variable from the tag list.
Is that what you want to do?
Hi Ronny, this is indead a big part of my need. I Will try this.
I have doubt or/how this Will work if I want to change more then 1 value.
In my example start discharging with different vallues for register 1000,1006 and 2000.
Well, I don’t know your flows in detail.
I would not recommend to create complete generic flows, because then you also could just use the Modbus cards with variable as content parameter.
I suggest to create flows for use case (one for min.power level with a parameter for % value). Don’t use registers as input. Just create a flow that sets all needed registers for your use case. Then it’s easier to use later.
Example: A flow to set discharge power level. I have to set some binary registers in addition. But the flow has only the % level as parameter:
Then it’s easier to use in complex flows like a simple action card - just with parameter.#
Dear Ronny.
I connected A Growatt inverter over a Modbus serial server over WIFI. I can read Holding registers, so thats perfect.
Now I like to write a single register (function 06).
Do I understand that there is no card for function 06?
Thanks for your support.
One day later: I used write holding register and that works great. So now I can read and write registers in the Griwatt inverter. Thanks for your great App.
Hi,
I have SMA setup with 3 solar inverters, 1 SMA Storage 5.0 with 32kWh battery. I could finally force charging using your modbus app, charging when prices are low. Have attached screenshot so others can see how it was done. A bit messy setup in flows, but it charges at night when prices are low. I use the parameter “Minimum width of backup power area”, and change it to force charging. Works well so far.
I hope you are aware of the fact that this is a parameter with a warning against “cyclic writing”?
See also [APP][Pro] SMA Energy - My home. My energy. Our climate - #464 by aste
Thanks for the tip!
Was currently writing 8 times per day, but might need to rethink this a bit.
Thats great news!! Hope it uses live prices from Nordpool, and not only time based..
For content that does not belong to Modbus app, please use a SMA topic - or create one in device section. Thanks.
