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

Hello,

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 (https://www.linux-user.de/ausgabe/2007/10/088-revolt-usv/index.html) 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?

Thanks
Werner