Can solar panels charge car batteries?

Of course you can, but battery charging must meet the following conditions:

1. Suitable charging voltage, car batteries are generally 12V, photovoltaic cells should be connected in series to maintain the output voltage. at 13-15 V;

2. Suitable charging current. The larger the photovoltaic cell area, the higher the output current. The appropriate photovoltaic cell area should be selected based on the charging current parameters provided by the battery.

3. Loading time. The lower the charging current, the longer it takes to fully charge the battery.