SSD Booting : low power issue

[Boatingbaileys]

...ended up using adjustable power suppliers on the boat which I kept adjusting until this went away.

Interesting: Can you describe the actual components? At this point I don't have an adjustable power supply. I'm currently powering the Pi from a (12V in, 5V out) powered USB hub. I also have a 12V-5V buck converter which I've never connected as I hadn't had problems with the existing configuration. I suppose that the first thing to do is try to power the Pi directly from the buck.

As I'd like to maintain the convenience of being able to physically disconnect the Pi, I'll cut off one end of a micro USB cable and then splice onto the buck's 5V output. Does this seem to be a reasonable approach?

If I'm still faced with the low power issue after having gone through the above, is there any way of powering the SSD (SATA Connection) separately from the Pi?

I’m running something like these

https://amzn.eu/d/cNIZSCE

And I tested the usb voltage with a unit like this (cheaper on eBay). 

https://amzn.eu/d/5KqSL6c

[url=https://amzn.eu/d/5KqSL6c][/url]I think the official Pi power supply is 5.1v and a lot of these usb power supplies drop when any serious load is supplied. I had to change mine from a plug and play unit to the above and then fine tune the voltage to get rid of any issues. It’s probably set at the device about 5.2 volts to allow for any voltage drop in the cables. I’m running an SSD setup too.