Trying to simulate a simple micro inverter, Cant connect scope
You are using SimScape, the physical simulation engine within Simulink. This is apparent from the use of "Domain Styles" for the interconnections


Electrical = Blue 
Gas = Purple
Hydraulic = Mustard
Magnetic = Purple
Mechanical = Green
Thermal = Orange
Liquid (thermal) = Yellow
Fluids  = L.Blue.


The 1st issue on your diagram is you are using the SimPowerSystems "PowerGUI"  This is the legacy electrical domain &amp; this block is needed for the other "specialised technology" blocks.

You have already started using base SimScape and this is the "modern" method &amp; as such you need to place a Solver block to the gnd reference 

Your actual question: How do i read my load outputs? 

Simulink has multiple simulation domains. The base domain is the SIMULINK domain &amp; in this domain the classic scopes,mux, etc exist. 

There is then the PHYSICAL-SYSTEMS domain. This is fundamental domain of simscape and this is where physical signals can cross physical domains.

Finally there are specific domains that are listed above.  Everything within the electrical domain can interact. Everything within the mechanical domain can interact. You cannot mix the two. The voltage sensor will create a signal in the PHYSICAL domain but this only facilitates interfacing with other simscape blocks. To interface with simulink you need a PS-Simulink converter 

Below is an example of what you need todo


remove the PowerGUI
Attach the solver block to a node in the electrical domain (trace=BLUE) 
Connect voltage sensor to the electrical domain (trace=BLUE)
Connect output of sensor to a PS-Simulink block (trace=BROWN)
Connect output of converter to scope (trace = BLACK)