I'm currently sending grid power from my house to a shed, and I'm now trying to send solar power from an inverter back to the house. I'm confused because the house can power the shed (120V AC displaying from an outlet in the shed, but when I connect an inverter to the shed outlet, I am reading negligible AC output at the house outlet (60V AC) after disconnecting the outlet from the grid. Why would it be that AC can go from the house to the shed and not vise versa? Is it possible there is some diode underground that blocks current from going the reverse direction?
I wish I could provide more details about the wiring, but I'm kind of working in the dark because it's underground and inaccessible. I've provided the crude drawing below based on my most likely flawed understanding.
Sorry I remeasured the AC voltage from inverter to house and am reading 60VAC (not 6VAC) on the house end. Seems like only half of the sine wave is being sent for some reason.
I've included some pictures of my setup. The first one shows the outlet on the home, the power comes from the attic down the tube into the box, which feeds the outlet. The cord in picture 2 plugs into this outlet and powers the shed through underground wire with 120V AC. When it's not connected, the extension cord has no power. What's weird is the cord has 60VAC when connected to the inverter (nothing else) so something must be going on underground since the shed has 120VAC from the inverter.