We're preparing to refresh our Cisco 3750's with WS-C3850-48U-L's each configured with a C3850-NM-2-10G. Our limit is 5 per stack.
The draw of one switch at 100% utilization is 117 Watts.
If you are asking for assistance sizing a UPS for the system I recommend you contact local sales support. The will know what models are available in your region and recommend the proper UPS.
Local support contact information is available at https://www.apc.com/id/en/support/contact-us/index.jsp
You will need to change the region at the top of the contact page to your location.
Choose a location