Power electronics DC DC converter question: What is the function of the capacitor and resistor connected between two series inductors?
Inductors block high frequencies, so it's my guess that they are to keep the switching current from the inverter seen by the photovoltaic module/cell near DC. It would be a bad thing to have the voltage drop on a photovoltaic system, because it would not be operating at the Maximum Peak Power Tracking point. 

It would also prevent the PV system from turning into an antenna and creating interference with other devices. 

EDIT:

It doesn't look like the resistor actually accomplishes anything for filtering (but might if you plug the PV system in).

The filters look like they have a pole to keep 100kHz away from the solar cells. I am also unsure if the inductors are in a choke but it looks like they are separate distinct inductors.