Hi,

is there any way to log voltage and temperature in time using build in sensors and save it to some file/ graph/ server?

Device RBMAPL-2ND

You can put together a script.
As an example combining this:
viewtopic.php?t=198614
with this:
viewtopic.php?t=189253

Or - way easier if you are not into scripting, try splunk:
viewtopic.php?t=179960
you can have something *like*:
download/file.php?id=49435