787 Batteries and Chargers - Part 1

[RR_NDB]

Battery connection to DC bus

Hi,

Uncle Fred:

Is this technically correct? Not having my flight manual at hand for the 777 but I thought the battery was online (so to speak) but just not carrying any load. I know the 777 is a different fish than the 787 but I am wondering why Boeing would have treated the basic battery logic any differently.
I know that offline might be defined as not carrying any load but I am speaking to the physical connection in this case e.g., the hot battery bus.

In an earlier post i commented on that. The scarce info we have so far points to a "switching" (automatic and immediate) of the battery (main) to the DC bus through a Diode. Doing that the designers could guarantee the bus will receive energy from the (charged) battery when this is required (when bus voltage starts to drop due any reason). As TURIN mentioned this happens automatically (when battery switch is ON).

I will comment further on that in few minutes.