question

Inverters switch as a group. So if one cuts out, they all will. Though this can be deselected in setup, but haven’t tested results myself.

Only one multiplus, just wondering if an overload cuts ac2 in addition to ac1 or if ac2, because it's not being run through the inverter stays live during a an overload shutdown. Is there any situation where interved power would be down but ac2 would be up?

OK, doing some more reading on this, appears that AC Out 2's default behavior will work for my application:

1) Main power present, 120/240 volts available on AC Out 2

2) Main power not present, no voltage on AC Out 2

3) Multi off/overloaded/shutdown, no voltage on AC Out 2

Do I have that right?

Also, looking at the other relays, seems like I could program this behavior on several of them. One important detail is missing though, AC Out 2 relay, when closed, passes 120/240 volts. What do the other relays pass (for example, the K1/K2 relays), 120/240V or 12V? I don't need much amperage, but my autostart works on 120 voltage sense, so a relay that passes 12V when closed won't work for my application.

Perfect, that's a great place to do my voltage sense for the generator autostart. Thank you very much!!

One quick question, what's the min wire size that the push in terminal on AC2 out will accept? I need about .1 amp, so, whatever the smallest wire size the terminal will grab will be what I use; I'll fuse it right at the Multi (probably a 5A fuse). Again, only using this for voltage sense, not to actually power a load.

For anyone else with this question, I did find it in the manual, AC2 takes 10AWG as the minimum wire gauge. I'm not sure if that's a mechanical minimum for the spring terminal or the sizing for the fuse (Victron recommends 35A max, which would be 10 gauge), but I'll use 10G out of the terminal block over to my voltage sense lines.

Pretty sure this is the best way to do what I'm trying to do; with the Victron directly in path (pre-transfer switch), I want to make sure I catch 2 different power failure situations for generator autostart, "Power failed, invertering" and "Power failed, inverter not functioning". My use case for this is kind of strange, so I doubt others would wire this way, I'm trying to drive the absolute maximum uptime possible for the power; I don't care if the generator runs more than it needs to, I just want to protect the power feed into the RV (we travel with animals and need to be sure that the AC can stay running if something happens to shore power or the Victron).

Thank you for the help!!

Just wanted to provide final update, I moved my "voltage sense" line over to AC2 today on the Multiplus, seems to work exactly as expected. Shore power disconnected, no voltage on AC2 (as expected). Multiplus off, no power on AC2. I didn't intentionally overload the inverter, but if it does overload, I'll report back; everything seems to indicate that would also trip AC2 to off as well.

Thank you for the help!

One more question. If I set an assistant on the AC2 output (for example, telling it to open the relay if a certain temperature is reached) does that override the default behavior of the AC2 terminal? For example, if I set a generator start/stop assistant on AC2 to start on load conditions, would that then make AC2 stay connected without shore power? Or would it basically have 2 conditions at that point, if no shore power; no power on AC2, AND if the load is high, no power on AC2?