Abstract: A power inverter assembly including first and second power inverter units configured to receive power from at least one energy source, and a portable structural platform to support the units. The units each have a terminals for connection to an electric power system, a solar panel arrangement, and a DC energy storage subsystem. The units are coupled to the platform. The first unit has a first pre-set AC power rating having a first maximum AC power output value for output to the power system and the second unit has a second pre-set AC power rating having a second maximum AC power output value for output to the power system to provide the assembly with a total maximum power output rating based on a combined total of the first and second pre-set AC power ratings. The energy source can include the power system, the solar panel arrangement, and the storage subsystem.