Quick Answer
Charging used EV batteries from solar can take anywhere from 6 to 24 hours, depending on the battery capacity, solar panel efficiency, and available sunlight.
Charging Time Factors
The charging time for used EV batteries from solar depends on several factors, including the battery capacity, solar panel efficiency, and available sunlight. A 60 kWh battery pack, for example, would require approximately 240-480 hours of direct sunlight to fully charge, assuming a 1 kW solar panel system. However, this time can be reduced by increasing the solar panel capacity or using more efficient solar panels.
Solar Panel Requirements
To charge a used EV battery from solar, you’ll need a solar panel system that can generate enough power to match the battery’s charging requirements. A general rule of thumb is to size the solar panel system to produce 1-2 kW of power for every 10 kWh of battery capacity. For a 60 kWh battery pack, you would need a 6-12 kW solar panel system to fully charge the battery in a single day.
Real-World Examples
In practice, charging a used EV battery from solar can be achieved with a smaller solar panel system, especially if the battery is not fully discharged. For example, a 3 kW solar panel system can charge a 60 kWh battery pack from 20% to 80% state of charge in a single day, assuming 6 hours of direct sunlight per day. However, this will depend on the specific solar panel efficiency, battery capacity, and other factors.
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