question

Using the battery voltage to determine an accurate %SOC is difficult. Not impossible, but difficult. Spend a couple of days researching Battery Voltage vs %SOC.

What type of battery do you have?

Post an image of battery and charger parameters.

Clearly, you do not have 83% SOC, because we do not let batteries go to 0 volt.

Is your "installer" certified by Victron? Because no Victron Certified Installer would tell you to use voltage, to compute %SOC.

What is a "Display Panel"? A Cerbo?

Image CaptionThe display panel is what they installed in the cabin of my van (see picture that shows 85% SOC; I don’t have pic showing current 24% SOC). I’ve also posted pics showing the voltage of one of my three batteries at full charge, versus partially depleted battery. What’s the trick to determining my remaining charge?

Image Caption

@James Giel : I had the same question time ago I taught myself a quick remainder that the SOC as an indicator of the Ah remaining to fully discharge the battery.

Official docs take a look here:

1. https://www.victronenergy.com/media/pg/SmartShunt/en/operation.html
2. https://www.victronenergy.com/media/pg/Lynx_Shunt_VE.Can/en/battery-monitor-settings.html

With no/light load at 11.5V your batteries are close to empty. Lithium with BMS, so no damage. But charge them. They will simply cut out to protect the battery when the BMS recognises it's too low.

You don't say what charging you have, but some chargers check for a healthy battery before starting charging. Many of these won't recognise a battery with BMS shutdown as healthy and thus won't start the charge.