here it is
Batteries of consumers set to 10% at slow consumption rate (1k) and 25% on faster ones (2k non stop)
At powerplant: left one 5% , right one behind switch depending on overall consumption 10-50%
with 4 big batteries and two logic ones you can store 200k so 10% means you activate generators at 20k left
sometimes theres a bug with automation after building „consumer switcher“. If both batteries are full there should only be one active shutoff (the second one, left from right, like in picture). If the fourth one is also active change the active signal of second batterie (right one) from 10% to 100% while game is running so the shutoff toggles between on/off some times then change to 10% back.