[canehdian]

I'm not technical enough to explain how this would work but I've always wondered why we couldn't have some sort of residential fast charging solution using batteries?

"Charge" the batteries slowly through solar or grid and then transfer than energy from the battery to an EV using a DCFC. That way you don't have to pull huge amounts of power from the grid.

Yes, that is the only feasible way to do this without enormous expense.

The optimum solution is to be filling that battery with solar energy during the day while you're away, and dumping it into your car when the sun goes away.
You still get the benefit of driving "for free" without have to actually be consuming it in real time as the sun shines.

 

[canehdian]

A pickup truck will not need a 150kWh battery.

An easy estimate would be to compare focus vs focus EV - the car is basically unchanged except battery shoehorned in vs purpose built products like i3 and Bolt that have no real comparator.
Using EPA combined values:
29MPG focus = 115mi/30kWh BEV
Guzzling 5.0L F150 = 16 MPG
1.8125x more energy required to drive the F150 than the focus = 54.4kWh, lets say 60kWh.

So your 150kWh battery would be more miles than a Bolt, which is already well above what any one person would do in a day to require home charging to full every night in 8h.
Any long distance travel would be at a commercial DCFC station, again negating the need to have one at home.

You size the charging to your charging needs, not to be able to refill your entire battery in one night that might happen once in a blue moon.
I could have a 150kWh battery and still use my LCS-25 happily every day, even if I drained it to empty one night. By morning I'd have more than enough juice to get me to work and back several times over. My battery would slowly fill each night I charge it with excess. I have no need to be topped up to max in one night, and 99% of the world doesn't either.

 

[canehdian]

Yeah, we have 600VDC for Toronto streetcars.
It would be interesting if they could expand that network to add a DCFC here and there, if future batteries are > 400V.
Pay with your Presto card and everything. Complete transportation system