For the internal plug on the SYS-PH I am trying to understand any real benefit to it being a covered outlet, vs just a standard receptacle? My thoughts are if building one from scratch an internal plug still makes sense as folks have posted using it to connect a battery charger etc, but given it is inside a standard receptacle would also then allow for one of the current designs that also has a couple of USB ports with two 110 outlets rather than a single 110 covered outlet?