Just finished watching Will's test YouTube video tearing down various "inexpensive" 12 volt batteries (he is amazing and I have learned so much from him). During the video he also looks inside a new SOK 12 volt with built in heaters and bluetooth.
Last year I setup my initial off grid system...
RockPaperScissors
I appreciate your question as I am looking for similar information. My system is a basic off grid 24 volt system with a Growatt all in one system. The Growatt will provide all the pertinent information (loads, battery level, charge rate etc). It also has a programable low...