When doing SYNC to external USB drive, NPS-10 draw power from both USB type C power input and internal battery.
NPS-10 draw power from internal battery even if external USB type-C power connected because max current from Type-C is 1.3A while (USB disk+internal disk) require peak 1.5~2A, so internal battery power is drawn when externally supplied power is not enough.

According to our experiment, when fully charged, NPS-10 can SYNC to external disk around 1.5 hours if it is hard drive.
So if you going to SYNC a large amount of data(more than 1.6TB) at a time, then it will make error because of lack of power.

Recommend fully charging NPS-10 before SYNC your disk.
That will minimize the risk of 'USB error' because of power failure.

Thanks for your answer. The USB error appears directly after the NEXTO ended copying the file from the internal ssd to the external hdd not while it copies. If there's not enough power for copying, why the NEXTO doesn't interrupt the copy process immediately?

What is the firmware version of your NPS-10?
If it is not V1.10, please upgrade it at here.
https://www.nextodi.com/support/download-view/?id=217

And send us the NPSLOG folder to following address.
ZIP that folder and send us. We will be able to check more details about your problem.
support_overseas@nextodi.com

I‘ve upgraded to the newest firmware the day before yesterday and bought a new and very strong power bank. If the problem continues, I‘ll send you the log file right away.

Thanks for your help!

OK.

Hi NextoDI,

I am also experiencing an issue with the lack of power being an issue. Type USB C as an i/o supports 100w or 3 Amps?

Please can you help to clarify this statement - “NPS-10 draw power from internal battery even if external USB type-C power connected because max current from Type-C is 1.3A while (USB disk+internal disk) require peak 1.5~2A, so internal battery power is drawn when externally supplied power is not enough.”

Where does the power go when connected to a mains socket? The cable carries 100 watts or 3 amps of power enough to power almost anything?
If I can connect the External SSD Drive that draws a max 2 amps to my mobile and it mounts / works why does it not work when connecting to NPS-10 made as an in the field data eater? WHERE DOES THE POSER GO?

Thank you

Not the problem of your battery or mains.
That is the NPS-10 who limits the USB power. Internal design of NPS-10 limits the USB type-C input power to 1.3~1.5A.
So no matter big capacity USB battery or Mains power connected, NPS-10 only sraw 1.3~1.5A.
That is to not hurt other legacy USB host device which might not strong enough.