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It’s good to just do the math for how much driving equates to how much electricity per day. At 3 miles per kwh it’s about 0.33 kwh per mile. EVs cars charge at

by ianai 4y ago

It’s good to just do the math for how much driving equates to how much electricity per day. At 3 miles per kwh it’s about 0.33 kwh per mile. EVs cars charge at 3.3-6.6 kWh per hour or 9.9-19.8 miles per hour with that efficiency. Further, that charge rate could be reduced if it’s too much for the line, theoretically, if things were smart. Edit-I figure in a perfect universe we’d have chargers at every likely to be used parking spot and they’d charge in accordance to power availability and the duration a person is likely to be there. So at work you’d plug in, the charger would know you’ll be there for a considerable amount of time, and maybe you wouldn’t get 6.6 kWh the whole duration but you’ll wind up at 80% (or whatever you requested) by the end of the shift. Similar with apartments. Costco or big box stores would assume you’d be there for 1-2 hours and would offer faster charging for those coming in from greater distances. Etc. it’s not impossible. This could ameliorate generation changes over time. Apartment complexes and residentials could use this instead of on-site batteries to make use of their solar generation.

pornel 4y ago
You speak in hypotheticals, but these things already exist. I often charge my car while shopping. The grid already handles high peaks. There's plenty of unused capacity outside of the 6pm-10pm peak of the Duck Curve. Cars support scheduling charging, so even if you come home at 6pm and want to plug in without thinking about it, you can (and note that a modern BEV used for commuting needs to be plugged only once a week). If you charge at work, it's even better, because that's at the bottom of the Duck Curve when you could almost get paid to get the electricity off the grid. Fast DC charging sites often already have large battery storage built-in, because it's already more profitable to use lower-power grid connection and/or off-peak electricity.

by ianai 4y ago

pornel 4y ago

You speak in hypotheticals, but these things already exist. I often charge my car while shopping. The grid already handles high peaks. There's plenty of unused capacity outside of the 6pm-10pm peak of the Duck Curve. Cars support scheduling charging, so even if you come home at 6pm and want to plug in without thinking about it, you can (and note that a modern BEV used for commuting needs to be plugged only once a week). If you charge at work, it's even better, because that's at the bottom of the Duck Curve when you could almost get paid to get the electricity off the grid. Fast DC charging sites often already have large battery storage built-in, because it's already more profitable to use lower-power grid connection and/or off-peak electricity.