I have both the H2 and H2+, and it runs fine off 12V. I have tested the system down to 11V, and possibly lower. The 12V or higher is required only for the 12V

I have both the H2 and H2+, and it runs fine off 12V. I have tested the system down to 11V, and possibly lower. The 12V or higher is required only for the 12V rail used power 3.5” SATA drives directly from the board.