How To Balance Solar Load With EV Charging Needs?

Assessing Solar Array Size

When sizing a solar array to support EV charging, calculate your daily energy needs based on peak sun hours and EV charging duration. For example, a Level 2 charger uses 240 Volts and 32 Amps, consuming 7.68 kWh per hour of charging. If you charge your EV for 8 hours a day, you’ll need a solar array that can produce at least 61.44 kWh of electricity per day. As a general rule, consider a 20-30% oversize to account for energy losses and varying sun conditions.

Optimizing EV Charging Sessions

To efficiently manage EV charging sessions, consider installing a Level 2 charger with a built-in timer or smart controller. These devices can schedule charging sessions during peak sun hours, when your solar array is producing the most energy. This reduces the strain on your solar array and ensures efficient energy utilization. For example, you can set your charger to start charging your EV at 8 am, when your solar array is producing the most energy, and complete the charge by 4 pm.

Battery Storage Considerations

When integrating battery storage with solar and EV charging, consider the following: a 10 kWh battery bank can store excess energy generated by your solar array during the day and supply it to your EV during charging sessions. This reduces the strain on your solar array and ensures a stable energy supply. When selecting a battery bank, choose one with a high depth of discharge (DOD) rating to maximize energy storage capacity. For example, a 10 kWh battery bank with a 90% DOD rating can store up to 9 kWh of energy.