Back on topic. The Powerwall battery, from a real user.
View: https://www.youtube.com/watch?v=jB6jyy0Joq8&t=1s
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The answer were already given with supporting links. What questions came were loaded and narrow focused, not understanding the big picture. Usually by someone who thinking he is clever. Sorry Mate, too wise to be dragged into that corner.
Well these electrician who think there is a problem had better take it up the National Grid man
View: https://youtu.be/ONp8dismI-Q?t=837
National Grid man Kelloway explains matters very simply. Kelloway does stress the
importance of balancing the grid using energy and electricity storage using water, large electric battery banks and hydrogen. This eliminates peaker power stations. Other ideas are around to balance.
I never made it up. Look at and listen to him. Learn for once.