This is the second unit purchased and so far very happy with the efficiency, ease of use and function. Currently using the unit with 4x 150W solar panels (two in series connected to each side). These are easy to setup (direct connection to panels) in either stand-alone or connected together for larger installations. The function is plug-n-play with seamless transitions between production and idle modes with a convenient LED indicator to signal the current status. Idle mode appears to be