[Richard]

I know NOTHING about a Victron inverter. I do not completely understand your questions because it can be interpreted two completely different ways.

Is your challenge about wiring the inverter with the automatic transfer switch in the cord bay? The transfer switch that changes between shore power and generator power?

Or is you question how to handle the internal transfer switch in the inverter that either provide power to the inverter circuits from battery power or shore power?

Can you elaborate?

[Jack Houpe]

That is a filter for the output of the old inverter. If you are not familiar with electricity I do not recommend DIY on this install.

[pairodice]

Jack/Richard - thank you for putting up with my cryptic posts and answering all my silly questions…
Richard, sorry, I was in the midst of trying to figure out how to wire this thing… your 1st question is on point:
“Or is you question how to handle the internal transfer switch in the inverter that either provide power to the inverter circuits from battery power or shore power?” - there are 5 wires coming into the old inverter:
1) AC input for the charger (tied into the ‘filter’ - the silver box in the picture - looks like 12/2 romex)
2) AC input for Transfer (assuming this means the ATS in the cord reel bay) this is tied into the ‘filter’ - the silver box (CORCOM EMI Filter) in the picture - looks like 12/2 romex - Can I just get RID of the CORCOM EMI filter?)
3) AC Output (this runs directly to the 30-amp plug on the opposite side of the inverter bay - that can be used to bypass the inverter)
4) AC Positive to/from the batteries (not sure yet but will track this down today)
5) AC Negative to/from the batteries  (not sure yet but will track this down today)
I’ve included the new Victron connections in the picture - it looks pretty straight-forward except where to wire in the transfer wires… any help is appreciated… I have a basic knowledge of electricity (enough to know to disconnect everything) but will find someone to help next week when we are down in Corpus Christi if needed… there will be boat places there that understand these things… Signature Solar said they would find an installer near me but never responded back…

[Jack Houpe]

The passthrough switch inside the victron inverter does just that, it passes through when you are hooked up to shore power then when unplugged from shore power it draws from battery and creates 120vac for certain circuits in the coach, all you have to do is wire AC in and AC out in the correct places and wire up a battery. What is the eg4 battery for? Is this 12v or 48v system?

[Richard]

Forgive my lack of diplomacy. STOP before you get hurt. Or you fry your new inverter. Or set your coach on fire.

You identified the lines from the batteries as AC lines, they are not. But it makes me question the nomenclature in your posts.

When you find help with the wiring, leave out that filter. It was a holdover from the modified sine wave inverter days in an attempt to control the buzz in those circuits.

[Jack Houpe]

If this is a 48v system you can not use the old 12v switch it must be upgraded to a high voltage high current switch. I know from experience.

[pairodice]

Thanks Richard. I have called Signature Solar and they referred me to a Solar installer about 1.5 hours away :-(
Hopefully there is a marine dealer near Corpus Christi that can assist… I agree that I don’t want to to fry my new inverter…
Jack, I decided to go all 12-volt for now and when I find an A/C unit that works both functionally and esthetically I will change it and then go full 48-volt…
We can function without an inverter for now as the bypass function works fine… I do want to figure this out for future knowledge…
I called Newell and they are trying to find someone to assist but they are all on vacation for 2 weeks…

[pairodice]

I managed to get the Victron Multiplus II connected and all is well - the inverter functionality works perfectly and the 110/220 side switches correctly (have not tried it with the genset yet but it is still using the Automatic Transfer Switch so it should be good). The only issue I am having is how to charge the engine batteries while the engine is not running. The MPII has a ‘trickle charger’ onboard and it can be connected to a relay to turn it on and off on a periodic basis. According to the techs at Signature Solar the only way to get the engine batteries on a ‘tender/trickle charger’ is to buy a separate charger - what are you guys using to charge the 8D AGM engine batteries? TIA!

[Jack Houpe]

Is it 48v or 12v inverter?

[Richard]

Because the lithium voltages made the on board trickle charger ineffective, I added a noco plug in charger hardwired to the chassis batts. Made a conversion plug for the buddy plug in the power cord bay to use for the noco, and left it on the noco when stored for the season.