4 ms·

> the Japanese grid can't handle EVs I have a feeling most of the world's grid can't handle EVs

by zumu 4y ago

smileysteve 4y ago
Acs are a much harder problem to solve than EVs. - First the instantaneous load, EVs don't require torque to charge like compressing a fluid. Fast charging has limitations on when it's optimal to use for the batteries and charging systems are capable of negotiating with the grid. - Time of Use (hourly). Unlike an AC, not every ev needs to be charged at reasonably the same time based on regional similarities (the worst time for the grid is when multiple hvac compressors try to start at the same time). Given a low amp slow charge (about 1/3 the needs of ac) an ev can still fully charge while over 12 hours while the user is at home. - Time of Use (daily). When the average commute is 20 miles a day and the average car has 200 mile range, the likelihood of every car needing to be fast charged at the same time on the same day is very unlikely. Tldr; electric vehicles are an extremely easy load relative to hvac and its usage patterns. The most obvious Internet connected optimization is that electric cars should turn off fast charging during a given 5 minute hvac compressor cycle (up to 30 minutes an hour) ps. Internet connected thermostats and EVs already offer time of use optimizations.
- theshrike79 4y ago
  https://www.gridio.io https://www.gridio.io has already automated EV charging based on real-time electricity cost. Usually people without any EV experience tend to overestimate the time EV owners spend thinking about charging. I've got a 230V/12A plug on my parking spot. It'll charge my car from ~20% to 100% basically overnight. Most nights I don't even bother unless I know I'm going on a longer trip.
theshrike79 4y ago
Nordic countries are doing just fine. We have a 230 volt 8A plug for most cars anyway, because ICE cars need it for their block and cabin heaters 50% of the year. And this is not just detached housing, apartment buildings have it too. That's enough to charge about 80-100km of range every night easily. If the cabling is done this millennium you can go to 10-12A single phase.

> the Japanese grid can't handle EVs I have a feeling most of the world's grid can't handle EVs

by zumu 4y ago

> the Japanese grid can't handle EVs I have a feeling most of the world's grid can't handle EVs

Acs are a much harder problem to solve than EVs. - First the instantaneous load, EVs don't require torque to charge like compressing a fluid. Fast charging has limitations on when it's optimal to use for the batteries and charging systems are capable of negotiating with the grid. - Time of Use (hourly). Unlike an AC, not every ev needs to be charged at reasonably the same time based on regional similarities (the worst time for the grid is when multiple hvac compressors try to start at the same time). Given a low amp slow charge (about 1/3 the needs of ac) an ev can still fully charge while over 12 hours while the user is at home. - Time of Use (daily). When the average commute is 20 miles a day and the average car has 200 mile range, the likelihood of every car needing to be fast charged at the same time on the same day is very unlikely. Tldr; electric vehicles are an extremely easy load relative to hvac and its usage patterns. The most obvious Internet connected optimization is that electric cars should turn off fast charging during a given 5 minute hvac compressor cycle (up to 30 minutes an hour) ps. Internet connected thermostats and EVs already offer time of use optimizations.

theshrike79 4y ago
https://www.gridio.io https://www.gridio.io has already automated EV charging based on real-time electricity cost. Usually people without any EV experience tend to overestimate the time EV owners spend thinking about charging. I've got a 230V/12A plug on my parking spot. It'll charge my car from ~20% to 100% basically overnight. Most nights I don't even bother unless I know I'm going on a longer trip.

theshrike79 4y ago

Nordic countries are doing just fine. We have a 230 volt 8A plug for most cars anyway, because ICE cars need it for their block and cabin heaters 50% of the year. And this is not just detached housing, apartment buildings have it too. That's enough to charge about 80-100km of range every night easily. If the cabling is done this millennium you can go to 10-12A single phase.