This is a house with solar and a 12 kWh battery. Pick a weather day. The page runs two plans and tells you which one buys less expensive evening power.
Greedy spends the battery as soon as it can. Look-ahead holds charge for 17:00–21:00. Same house. Different bill.
Solar used Battery Grid import Peak 17–21
SOC 0–12 kWh · start 4 kWh