> Why would they be ubiquitous at the household level, not centralized as a "electric grid backup battery", like Australia's "big battery"?
Let's assume the existing electrical grid to be a somewhat fixed system that gets augmented from time to time here and there but does not get changed in fundamental parameters like voltage.
Then there's a certain grid capacity for transmitting power (watts) from central nodes (existing or former big power stations) to that large number of end nodes (homes) or in the opposite direction.
Let's also assume that the combined capacity of all the power lines which connect the homes to the grid massively exceeds the capacity of those (big) lines that connect the "central nodes" to the grid.
This means, that there exists a certain level in the hierarchy of the electrical grid (between central nodes and end nodes) where the lines do indeed match the capacity of all homes.
I'd think, these are the locations where you would build/connect centralized big batteries to the grid.
Because you could then take up all solar power from homes and at the same time you'd have some centralisation which would make building the facilities less expensive because of economy of scale.
Let's assume the existing electrical grid to be a somewhat fixed system that gets augmented from time to time here and there but does not get changed in fundamental parameters like voltage. Then there's a certain grid capacity for transmitting power (watts) from central nodes (existing or former big power stations) to that large number of end nodes (homes) or in the opposite direction.
Let's also assume that the combined capacity of all the power lines which connect the homes to the grid massively exceeds the capacity of those (big) lines that connect the "central nodes" to the grid.
This means, that there exists a certain level in the hierarchy of the electrical grid (between central nodes and end nodes) where the lines do indeed match the capacity of all homes.
I'd think, these are the locations where you would build/connect centralized big batteries to the grid.
Because you could then take up all solar power from homes and at the same time you'd have some centralisation which would make building the facilities less expensive because of economy of scale.