Track put it next to the 240V power in. It hooks directly into the BCDC Charger. However, if your portable solar panels have their own controller, then you can plug them directly into a merit plug and I think there may be one near the 240V inlet. I wouldn't plug more than one x 120W solar panel into a merit plug though as the standard Topaz wiring to merit plugs is about 10-15A.. Others may be able to confirm that.