I am installing a Multiplus-II 12/3000/120 2x120 into my RV and was looking for some guidance with an existing transfer relay delay. My RV has 2 external connections, 1 - 120V, 50A shore power connection and 1 120/240V, 50A Generator connection. Both of these feed into my Intellitec Transfer Relay (00-00803-400) then to the main panel. My thoughts are to leave the Intellitec unit in place but move the output to the AC in of the Multiplus then wire multiplus to the main panel. Does anyone have an experience with a similar setup?
What does it look like if you use a Quattro? Otherwise, you’ll still need the right changeover switches with suitable switching sequences for the neutral conductor contacts (leading/lagging).
I have our coach wired that way, MP after the transfer switch. The old inverter was a single leg pass-through fed by a 30A breaker in the main box, the output fed a separate set of breakers. I consolidated the breakers into the main box, fed by both sides of the 2x120.
The MP does power the whole RV when wired that way. You’ll have to manage the large AC loads yourself OR tie the separate breakers to output 2 to operate on shore only. I use output 1 and load shed using Shelly relays and digital outputs controlled by a Cerbo GX.
Thanks for the replies!
Paul when you suggest managing the large AC loads, I am assuming you mean to simply ensure I do not run much else when I turn on the AC? We generally don’t run our AC too much when boondocking (Pacific Northwest/Northern Montana/Northern Idaho mostly), maybe 1-2 hours to simply cool down our unit.
I run a champion 5500W (4000W continuous) generator, so I was thinking I would program the Multiplus AC input current limit to ~30A. Again, we are very conservative when running the AC unit and would continue to be that way.
I guess the only time this would be an issue would be if we are truly connected to 50A shore power (rare), then I would be limited to the multiplus current limit setting?
Yes, we had to manage the 2 AC units, water heater electric, and maybe the absorption fridge electric. The UPS function will try to maintain power when disconnecting from shore.
A Cerbo GX and Android tablet make a great interface to your system for changing settings and monitoring tank levels, batteries, solar, etc.
It was hard to run an A/C for any length of time without the genset. I swapped our bedroom A/C to a DC variable speed unit. It was a total game changer for dry camping and it doesn’t compete with the microwave or laundry for the inverter.