Are the batteries used in a Solar System different from regular batteries? Can I use car batteries instead?
No. Car batteries are not suitable. Only batteries designed for repeated cycling (the partial discharge of a battery and then recharging it to full charge) are suitable for use in a Solar System. Cycling, in a Solar System, occurs during nights, when the battery is discharged without any solar charge getting into it. During the day, the solar modules charge the batteries again.