1) Duel voltage generator sets some times have 55 volt to earth. Connecting neutral to earth outside the generator is a bad move.
2) Generators are often designed for one use, we had some designed to run flood lights, and the voltage regulations was only correct at two current outputs, no AVR.
3) Inverter generators can reduce the revs on low load, and some models are designed to be able to run in tandem.
4) Some generators are designed to tick over with no load, but voltage drops.
5) Some diesels do not like running light load. They carbon up.
When working on the Falklands everything was powered from generators from 1.5 KVA to 1500 kVA and it was some times a problem with the lower output units where motors would not start, shears for example. Also some of the smaller generators clearly not designed for 24/7 use, a belt drive to a Lister LT1 would run for years, but Briggs and Stratton lucky to get one year, but the latter were small and light.
Having a generator thumping away all night is not what one wants, and this has become a problem with caravan sites which have no electric huck-up.
The inverter (UPS) will often grid tie, and automatic take up the load when power fails, but again I remember on the Falklands we installed an UPS which failed more often than the generators. But an UPS supply for phones and internet makes sense.
In Algeria on our main camp generators were synchronised, but else where used like key switches, with only one key, so one switch had to be switched off, key removed, and fitted into another switch and we had strict instructions not to re-energise until 5 minutes had lapsed, this was because of having so many air conditioning units, refrigeration units want the pressure to drop before being restarted.
Although one can get brake before make change over switches, where the generator is used it is good to have a plug in arrangement so if your generator fails you can hire one. So the 16 amp or 32 amp commando type plug and socket is favourite. Using a 32 amp lead
for EV charging means you can plug in direct to generator or domestic supply, the worry is where the domestic supply is TN-C-S when we really want some loss of PEN detection, but easy answer is a TT supply.
There is much to consider, and I would say not a DIY job, and one wonders if a simple inverter generator and lead through window to freezer is no a better answer?
These are so portable you can move it around item to item to keep them cool. Yes some messing around, but £500 and job done, no wiring, simply an extension through the cat flap.
