Help needed with customizing Solar Battery App

I would like to modify the MySolarBattery app on my EmonPi so that it can support more than one battery and show the state of charge line separately for each battery. Is there any guides or further reading to help me with that? Is it sufficient to just copy and rename the MySolarBattery app and start hacking around with it, or do I need to know some commands to integrate the new copy into the system?
Thanks.

You can just make a copy of it and it should show up in the list. I’ve done similar to add my ASHP to the page.