The RoseWater Hubs are designed to provide 24/7 power conditioning true Uninterruptible Power Supply (UPS) functionality with zero transfer time, energy storage for backup, and the ability to harness excess solar power for self-consumption. When AC input is available, AC power is converted to DC, which is then converted back to AC for use in the critical load panel. When AC input is unavailable, DC battery power is converted to AC with zero transfer time. An intelligent controller module decides when to draw power, and how much power to draw from the AC or DC source. During AC input brownout condition, output power is supplemented by battery power.