I'm in Australia, with Globird, and have their 3hrs free plus they pay $1 on days I don't use any grid power between the 6-8pm peak, and another $1.50 if I send them back 10kWh of the energy I was given for free during the day, during that peak. In winter, with bugger-all solar (maybe 5kWh generation if I'm lucky) I pull 10kW/hr into a 40kWh battery for those 3hrs each and every day, while also running the heating as high as possible to gain some thermal battery effect too. That 30kWh of battery charge is used up by late evening or middle of the night by fully-electric heating (RCAC split systems and a large ducted RCAC system), so the battery goes down to 5% where I stop using it except in the case of grid failure, and back up to ~75% each day. The idea that no one uses more than 24kWh of electricity each day is absurd - not only will I pull 30kWh to charge a battery, I'll also pull another ~30 or so just to keep warm. My house could easily use 100kWh per day if we heated it to a pleasant level instead of a warm-enough level.
The main problem, as Australians are no doubt aware, is that our houses are large and poorly insulated. I've done everything sensible already (ceiling + floor insulation, draft sealing, honeycomb blinds, etc) except paying $100,000 to double-glaze all windows, and it still feels like a tent.
Despite all this ranting, electricity is now effectively free in summer for me, and ~$5-8 per day in winter. Pre-battery it was in the ballpark of $10-25 per day. The battery should have a payback period of 4 years, but was heavily subsidized by the government. Due to how I'm charging and discharging it so regularly, I'm expected it might only have a 10yr lifetime.