In a residential solar array, bypass diodes are used when panels are in series to prevent a shaded panel from effectively becoming a large resistor. Blocking diodes prevent current from going back into a panel (or series of panels) in parallel with a load or other panel series. From what I understand, these were used in the dark ages (pun intended) of solar energy when people dumped the electricity from the panel straight into a battery bank and didn't want the reverse happening at night.
Do installers typically install blocking diodes for PV panels in parallel, such as with a string inverter?
The inverter obviously doesn't rectify current so the panels can't draw power from the AC-side, but I am worried about, for example, if Panel 1 is at a slightly higher voltage than Panel 2 and some current produced in Panel 1 being sunk by Panel 2 as a result.
In this case, I am working with "identical" (same manufacturer and model, and likely manufactured around the same date in the same facility) panels.