2. You’re counting all energy use, I’m just counting electricity
3. $200/kWh * 400 TWh is $80 Tr not $80,000 Tr
4. That’s not “just one day”, it is >4,000 days because the battery can be recharged that many times
5. Even if you forced everyone to accept blackouts until this would be completed (won’t happen), they would occur at night.
Except that’s $29 Tr when using the cheapest currently available batteries that I’ve seen.
7. The lifetime cost of the battery and a PV cell is cheaper than the fuel in a coal plant even when the cost of the coal plant itself has been written off, so each incremental step of that combination is still profitable compared to that particularly fossil fuel.
I’m not sure about the cost of wind or other fossil fuels, but the combined cost of PV+battery that anything else has to beat is 5¢/kWh.
EDIT:
8. Land costs. The energy density of LiIon batteries is “250-693 Wh/L”. A high efficiency 1 m^2 sun-tracking PV panel with the lowest energy density battery would produce up to 400 W * 12 hours = 4800 Wh = 19.2 litres = a layer behind the PV panel of 1.92 cm thickness. Why is this supposed to be a criticism?
Current capital costs are about $200/kWh. Daily global energy use is about 400 TWh. That would be an 80000 trillion dollar battery.
The number is so large we just can't build it, so it's actually infinite. It also doesn't take into account land costs, because these batteries will take huge amounts of space. It's also only for 1 day, and there will surely be multiple days where wind and sun are below 20% output, so you'll need to accept periodic blackouts.