Can't find a driver for Revolt 800VA UPS with NUT


I’am trying to install the UPS 800VA from Revolt with NUT but in the Hardware Compatibility List (Network UPS Tools - Hardware compatibility list) there is no Revolt.
I’ve tried the genericups driver like described here ( for the 500VA.
But upsd says the battery is low even it is 100% full.
Can anybody tell me how to find the right driver to use?