11.5 volts! That is super dead. I would check the easy stuff first. Disconnect your panels and check that you have voltage ( usually an 18v panel will output 23v when not loaded). If your panel work check your connectors. Then check your wires for continuity, putting a lead of the voltmeter on each end looking for 0 ohms.
Let us know how it goes
Looking at your setup again... I would bet the culprit is your AGM batteries. They hate being deeply discharged, and it doesn't look like you have a dc regulator after the battery which would prevent this.
https://batteryquery.com/how-to-resuscitate-a-deeply-discharged-agm-battery/
I’m not following how a regulator in and of itself helps. What you need is some circuit to prevent leakage once you hit some threshold (Undervoltage Protection). I suppose it could be a regulator but could be much simpler
A caveman tier solution could be just unplug the battery if you know you’re not gonna use it after at least a week bc what probably happened was you leaked a few mAs for like a year a went into deep discharge nostr:npub1h8ktyt8zvqc8dcpk7yh9gq6fs0csqcujlkqdwwspwgtef9ral6xqzugdky
I am taking it to camping world today 😬👀
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