Originally Posted by MIDMONDN
How did the remove and replace of your charger go. I am planing to install a Magnum Energy MS2012 inverter / charger.
The OEM 45 Amp DC max output converter charger is behind the breaker box under the bed and has a heavy duty grounded cord that is plugged into an integrated outlet in the breaker box that is from a dedicated 15 amp breaker. I removed it well insulating the ends of the now un-terminated 12 volt wires.
I ran 12/2 Romex terminated in a 15 A male plug that goes into the same integrated outlet in the breaker box the OEM converter cord used, run to the Xantrex 1000 Inverter location that already had direct 12 volt wire runs to the battery compartment that were sized for 150 Amps DC. I removed the Xantrex 1000 and located the 100 Amp DC max output converter charger there.
New 2000 watt pure sine wave inverter was mounted in the front passenger compartment by the entry door on the wall facing the batteries. The output of the 2000 watt inverter runs to three 20 A DPDT hot-neutral transfer switches, one in line with the microwave in that branch circuit, two more in line with the AC convenience outlet branch circuits. I wanted all the user outlets and the microwave to get AC from the inverter for convenience when boondocking.
All that said, you will have to design a different solution since you are using an inverter/charger with built in transfer switch ($$$$) vs. my arrangement with separate converter/charger and inverter ($$$).
#1 - You will still want to disconnect the OEM converter/charger I don't think it would be a good idea to have two both trying to manage the same batteries.
#2 - When your Inverter/Charger has an AC source and is in bulk charge mode it can draw up to 1,000 Watts AC power and so it is still a good idea to have it on a separate breaker like the OEM converter/charger was. So even though it has an internal transfer switch you may still want to feed its AC output to other branch circuits using external transfer switches, sized as big or bigger as the branch circuit breakers. You need one transfer switch per branch circuit you want to feed with the inverter. Vista only has 2 15 Amp breakered convenience outlet branch circuits. IMO this is best way because it maintains the ability to draw full power from each branch circuit when on normal shore power.
#3 - I also added a 3rd transfer switch between the power management system and the microwave so I could run the microwave from the inverter. But not sure I would do this again. I can only run the microwave about 60 seconds before at the high DC current draw required the inverter does low voltage shutdown, even with fully charged batteries. But, it does allow me to use the 120 V exhaust fan and rangetop light that are integrated into the microwave when the inverter is on.