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Please confirm the version number of the Multi and that it is running the latest assistants if any are installed.
There is some information about Storage mode here, in the 4 stage charging section of the manual.
Depending on your system design, and how the Multi has been configured, if you have an AC input available to the multi, it may prioritise that over discharging the battery for running the loads, it may use the AC input to charge the batteries, or it may export surplus power back into the AC input.
Disconnecting the AC input should begin discharging the battery to power the loads in any configuration.
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