Problems powering Penta SATA HAT and Raspberry Pi 5

I have had the Penta SATA HAT for around a week now and have been using it with a Raspberry Pi 5. Ever since I first turned it on I have had problems with a message showing after each boot in Pi OS that says “Reset due to low power event. Please check your power supply”.
Before buying the hat I read the instructions carefully and purchase a 12V 10 Amp barrel connector power supply. I believe this should be plenty to power the Pi5 and 4x 2.5" HDDs I plan to use. However I even get the message when powering just the Pi 5 and the hat without drives and booting from an SD card.
As a test I also tried powering the Penta SATA HAT and Pi 5 via the Molex connector plugged into a 850W PC power supply and still receive the message. If I power the Pi 5 and hat via the official Raspberry Pi 5 USC-C power supply then I don’t get the message. However I think this wouldn’t give me enough power for my drives.
Has anyone else had this issue and what did you do to resolve it?