A power converter, comprising: a power input configured to receive input power from an AC power source; a power output configured to provide output power to a load; a battery interface configured to exchange DC power with a battery ; and power converter circuitry coupled to the power input, the power output, and the battery interface, the power converter circuitry adapted to, in a first interconnection configuration, convert the input power into the DC power at the battery interface, and further adapted to, in a second interconnection configuration, convert the DC power at the battery interface into the output power, the power converter circuitry having: a power line coupled to at least one of the power input and the power output; a transformer; a first connection node switchably connected to the power line in the second interconnection configuration and switchably connected to the transformer in the first interconnection configuration; and a second connection node switchably connected to the transformer in the second interconnection configuration and switchably connected to the power line in the first interconnection configuration, wherein the second connection node is connected in a current path between the transformer and the load in the second interconnection configuration. a power input configured to receive input power from an AC power source; a power output configured to provide output power to a load; a battery interface configured to exchange DC power with a battery ; and power converter circuitry coupled to the power input, the power output, and the battery interface, the power converter circuitry adapted to, in a first interconnection configuration, convert the input power into the DC power at the battery interface, and further adapted to, in a second interconnection configuration, convert the DC power at the battery interface into the output power, the power converter circuitry having: a power line coupled to at least one of the power input and the power output; a transformer; a first connection node switchably connected to the power line in the second interconnection configuration and switchably connected to the transformer in the first interconnection configuration; and a second connection node switchably connected to the transformer in the second interconnection configuration and switchably connected to the power line in the first interconnection configuration, wherein the second connection node is connected in a current path between the transformer and the load in the second interconnection configuration. a power line coupled to at least one of the power input and the power output; a transformer; a first connection node switchably connected to the power line in the second interconnection configuration and switchably connected to the transformer in the first interconnection configuration; and a second connection node switchably connected to the transformer in the second interconnection configuration and switchably connected to the power line in the first interconnection configuration, wherein the second connection node is connected in a current path between the transformer and the load in the second interconnection configuration. <EOS>