PIP Solar bulk voltage as number

**Describe the problem you have/What new integration you would like**

**Please describe your use case for this integration and alternatives you've tried:**

**Additional context**

Dear,
is possible add to this integration a number for set a bulk voltage? Float and under is implemented, but bulk not.
Thank you.

The request identifies the PIP Solar integration and its existing float and under-voltage settings, but names no files, tests, or entry points. Start by locating that integration and comparing how those settings are implemented; done should mean that a numeric bulk-voltage setting is supported and covered by appropriate tests.

Written by the indexing model from the issue text.