The Steca Solsum 20A 12/24V solar charge controller is an efficient and reliable solution for small off-grid solar systems. It supports both 12V and 24V systems with a maximum charge current of 20A. This controller ensures optimal battery maintenance and longevity through its advanced pulse width modulation (PWM) charging technology. It features automatic detection of system voltage, and comprehensive electronic protections including overcharge, deep discharge, and reverse polarity protection.