EV Charging at Home: Smart Scheduling Cuts My Costs by 60%
When I got my EV last year, my electricity bill jumped $140 per month. Then I implemented smart charging with time-of-use rate optimization. Now I charge the same amount for $56 per month – a 60% reduction just from charging at the right times.
Time-of-Use Rates Explained
My utility charges $0.32/kWh during peak hours (4-9 PM) and $0.11/kWh during off-peak (midnight to 6 AM). Most people plug in when they get home at 5 PM and charge immediately at peak rates. My system waits until midnight automatically.
The Automation
I use an Emporia EVSE (Level 2, 48A) connected to Home Assistant. The automation checks my car battery level via the Tesla integration, calculates required charge time, and schedules start time to finish charging by 6 AM while staying entirely in off-peak hours. If I need a full charge urgently, a button override starts immediate charging.
Solar Integration
On sunny days, a second automation kicks in. When solar production exceeds household consumption by at least 3kW, the car starts charging at reduced amperage using excess solar. This free charging covers about 30% of my monthly driving needs in summer. The combination of solar diversion and off-peak scheduling makes EV ownership remarkably affordable.
