ESP32 help

I have built a few 24V nominal 7s batteries myself and I am also using the generic Chinese BMS with the Bluetooth dongle in all of them. I must admit I'm quite pleased with them, so I'm sticking for the time being, since all the batteries I build are smallish at 2-3kWh, which I then parallel at their outputs if I'm in need of more storage for a particular project.

I've been working as a renewables site engineer lately, planting PV solar parks and I am using these batteries to power the alarm/cameras systems up until the plants get connected to the grid. The original setup was using lead-acids, but given the temperature fluctuations and general awfulness of lead-acid batteries, I am finding that my diy lithium batteries work 5x better.

However, there's something missing; It would really be awesome to have a way to monitor the batteries from afar, since there is already GSM internet installed on each plant. Alarm system and camera NVRs are already online, so it would be great if I could somehow bring battery information of solar charger and stuff online as well.

Question is: Where do I start? What kind of a platform would be necessary for such a mobile solution? Would an Arduino-based board do the trick? Any tutorials available online? I did a bunch of searching, but seems like the stuff I find online require some degree that I don't own, just to be able to understand the basics.

Thanx for any info.
 
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