See this diagram, if you have a DC load drawing power from the it will be measured. Everything flowing into or out of the battery is measured. You may not have all these devices.
If you have the shunt wired as shown and set as battery monitor the SOC will be accurate. The DC loads calc will be an estimate. If you want accurate SOC and accurate DC loads you need 2 shunts, one battery monitor and one energy meter set as DC system. See
