Is there documentation on the solar option, such as where to connect and what voltages are allowed?

Is there documentation on the solar option, such as where to connect and what voltages are allowed?

We don't offer technical support for third-party panels, but we've tested a wide variety of "nominal 12V" panels without issues. In theory, anything up to 20V should function. The connector is a JST-PH header marked "Solar" on the Lower board.