Some UPS’s dont like gennies for a few reasons:
1) They sense when theres no neutral/earth link
2) They dont like an input of less than 220v (even the smallest genny volt drop can cause this)
3) Any change in RPM (frequency) will be picked up by the UPS and again it will keep swapping from genny to backup battery.
I make sure these diesel gennies overcome all the above probs, I put the N/E link in myself, so the moment you earth it with a rod it mimics mains supply.
If at 50Hz the power is saying 220v then can adjust the alternator itself to increase output voltage nearer to 230/240. This is sometimes needed on 110/220v gennies.
Also diesel gennies hardly fluctuate. Its well easy to set these listers to 50Hz and they stay quite stable.
I soon will have another genny the same but this will also have a built in fuel tank in the base, and be electric start. I will be asking for around £450 ish for that one when its done.
I often get gennies in, they are usually 110 volt ones and I just alter the windings on the alternator to give 220 (or above) out of them, then sell them on after a service. Only thing is lately im on a mission, half way through building a biodiesel reactor in my workshop so my time is taken with all that at the mo. Be glad when its done!
