Scrape battery value


I would like to ask you for advice how to scrape value from my fotovoltaic web page. Cannot post link, because it is protected by my password.

If I copy selector in google chrome, I got this:

body > div.main-viewport > div.main-viewport-content > div.view.view-main.wrapper > div.section.overview > > div.value > span

in detail segment I want is here:
<span class="de" data-name="bat_c">78</span>

I wan to get battery value in %. Means value 78 now. I wanted to use build in integration scrape.

I fill in login, password and link. After that, I paste copied selector:

Unfortunately it is not working. Please can someone advice how to do that?