Hi guys,
I’ve just got hold of a Shelly Uni, just for the purpose of the ADC. The readings obtained are about 1v to low.
If there a way to offset this value so It displays correctly?
I am running HA on a raspberry pi 4 and using the native Integration.
core-2021.1.5
supervisor-2021.01.7
Operating System
Home Assistant OS 5.10
Cool that you’ve got a Shelly Uni hooked up. I’m waiting on a delivery for one.
Can you use a Template that just adds 1 to the value and puts that into a new entity?
Here are some examples:
I’ve just had a look at templates and that’s totally beyond me, I was hoping that just a simple edit to the driver would do the trick. 
Does the Uni have a web interface?
If so, is the voltage correct there?
If not: report it to shelly support.
It does have a web Interface and the voltage reported there Is the same as in HA, there are some options In there but none for the voltage offset. I have another Uni coming this week, If I get the same results then I will report It to Shelly.
When I get mine, if it shows the incorrect voltage, I’ll post the Template code to correct it.
My second Shelly Uni arrived today and I get exactly the same results…Reporting about 1 volt lower than the true value.
Support ticket now opened with Shelly.
I got mine yesterday and it measures voltage exactly the same as my multimeter. I used the HACS Shelly software instead of the built-in Shelly software in Home Assistant. It supposedly can be run in addition to the built-in one:
Note that I had to use the “voltage: { decimals: 1 }” lin in my configuration.yaml to get it to not round off to an integer.
So that begs the question, what is Kevin using to measure the “true” voltage?
Also a comparison of firmware versions between you two may be revealing.
Are you wiring up four wires to the Uni? - red/black for positive/ground, green for ground and white for positive you want to measure?
Sorry for the late reply, I’ve been transfering my set up to ssd.
All sorted now, I did not connect the sensor gnd wire 
Thanks for the Input gents.
Ah. So they’re isolated inputs.
Well this has saved me a bit of panic, thank you. I went to check the manual and sure enough, the diagram shows you should do this. Odd enough that I didn’t think I need to read the manual for this.
