I have a client i am designing an offgrid system for.
They do have a swer dual phase supply to the property and intend on keeping the connection to be used as an emergency backup on a changeover switch in the event of system failure.
As such the property is wire as dual phase.
Unfortunately they supplied the generator already and its a single phase 8kva.
the system will consist of 2x quattro 8kva, 2x fronius gen24 4kw and 1x mppt rs 450/100 with pylontech us5000 and an Ekrano.
I know in a standard parallel and 3 phase installation that all quattros must be wired to the genset.
My question is, is it possible to wire the single phase genset to just one of the quattros ac inputs?
Is there any setting whereby the second quattro can ignore the lack of ac input when the first quattro has starting receiving power from the genset?
Can the genset be set to only charge the battery from the first qauttro?
My gut feeling and with what i have read is that, no not possible. but hoping someone might have more insight.
I have designed and built dozens of victron off grid systems but all have been single or 3 phase.
Dual phase is a first for me.
ok, im answering my own question here.
From all the victron documentation ive read, no its not possible.
So, what i am going to do instead is set the victron system as a single phase parallel which i can utilise their single phase autostart genset.
Leave the house wired dual phase ( no dual phase appliances) and a changeover switch where by when switching to grid, will supply dual phase power, when in off grid position, supply house with single phase to both legs of the house board (bridging the “dual phase” input of the changeover switch inverter side.)
There will be no risk of bridging phases on the grid side as it will be connected direct to the changeover switch.
In VE.Bus System Configurator, try turning off (removing the check in the checkbox) “switch as group” for the AC input the generator is connected to. This should allow you to do what you want.
“Switch as group” should work
Only issue is you’re basically wasting a bunch of fuel running it like this. It’s very likely set up with an L1/L2 output and these phases are typically neither 0° or 180° from each other so combining them for 8kw 120v or 240v is not an option. You’ll only be able to utilize one leg, half of the generators output at most (if you were to max out one leg which isn’t advisable for any length of time)
I would be looking at finding a way to get a different generator especially if your generator power requirements are over 3500w