In a case with two standard panels, say ~400Wp each, there are situations where you may want to switch form parallel to serial. A possible case for this is when you want a mode to add 230V to the grid or want a mode to charge LiFePO4 cells.
For that a heavy switch is required, switching DC is challenging. Here is an example of a suitable 63A switch:
The trick: How do you switch two panels between parallel and serial? This is the schema:
