I wanted to find out what the best time would be for EV's to charge their vehicles, that would minimize their strain on the electrical grid. In theory, these are times where base load power plants may also not be operating at their nameplate capacity (and therefore not at their peak efficiency). This conclusion seems to agree studies done in the past, and the implication should be that charging during these times also makes the grid power generation more efficient.
In any case, I looked at the NY ISO grid data over the last 8 months, and compiled many graphs (some shown below). I also looked at a report that had a graph showing notional demand across the country (also shown below). The results are similar, with some time skewing.
In short, for New York state, the lowest point of demand is centered around 4:00am. What does this mean? Here's some examples of settings that would charge your vehicle to minimize the amount of strain on the grid and help with load balancing in New York State:
- Example 1, Fully Discharged Volt, Level 2 (240V) Charger: Set to Delayed charging, with a finish time of 6:00am.
- Example 2, Fully Discharged Volt, Level 1 (120V) Charger: Set to Delayed charging, with a finish time of 9:00am.
- Example 3, Fully Discharged Leaf, Level 2 (240V) Charger: Set to Delayed charging, with a finish time of 8:00am.
- Example 4, Half Discharged Volt, Level 2 (240V) Charger: Set to Delayed charging, with a finish time of 5:00am.
You get the idea... For my specific use, I usually am about half to 3/4 discharged on my Volt, so I've decided to set my default schedule to delayed charging with an end time of 5:30am.
NY Time of Day Electricity Demand Detail.jpg
NY Time of Day Electricity Demand.jpg
US Time of Day Electricity Demand.jpg