Shore Power/Battery Maintainer Options?

[Big_ern_101]

Looking to get some options on a simple shore power/battery maintainer options in my 2006 Econoline

Current setup is:
-2x AGM starter batteries
-1x 100ah Lithium house battery
-200 watts of solar on the roof
-250A single alternator
-Renogy 50A DC-DC charger (the one that does solar and alternator charging of house battery and allows the solar to float your starting battery once the house battery is charged)
-Renogy Shunt
-Noco Genius 10 Pro charger connected direct to house battery AFTER renogy charger.
-No need for inverter/120VAC when running off battery
-Loads on house battery are ARB fridge, Diesel Heater, Maxxair fan, USB chargers for phones, lights, etc. Pretty low load.
-Weekender rig, not full time.


Desired:
-Single 120VAC Wall plug.
-Unplug and go simplicity. No switches or cables to move
-Maintain lithium and starter batteries. Keep them topped up and ready to go
-Supply enough amps that if I am in a situation where I have 120VAC, I can run loads off shore power.

Issues:
-Genius 10 charger gets batteries topped up and shuts off. Kinda sucks.
-Can only connect Genius 10 to one of two batteries - house or starter.
-Could get a separate maintainer for starter batteries, but thats one more thing to headache with.

Best idea so far:
-Source a 24 VDC 5A power supply.
-Switch between the 24VDC 5A power supply and solar panels using a SPDT relay with the trigger being when the 24 VDC power supply is energized.
-Feed the 24 VDC 5A power supply into the solar input of the Renogy DC-DC Charger.
-Use the Renogy DC-DC charger to maintain both batteries, basically faking it into thinking solar is coming in even when vehicle is parked in the garage.

Thoughts? Suggestions? Alternate options? Am I a dummy?

 

[Scalf77]

Not a totally crazy idea, At one time Bogart Engineering offers up a similar solution.

I think finding the correct power supply is the real issue.

Another charger solution could be a KISEA AC1240 Abso 40A, 12V Battery Charger

This can be configured to charge your house battery at lithium and also charge a secondary battery at wet cell or agm. You would need to isolate the DC-2-DC charger when charging the starter via house.

A lot of people on the transit forum put 15 amp circuits into their van for shore power, obviously the cabling is lighter. If you go 30 amp then you need to start adding branch breakers. It would depend on how much you plan on using shore power for other task.

 

[Big_ern_101]

Well good to know i am not totally off base. I think I will order up a 24V power supply from the river store and see if my charge controller likes it. If that works, I will proceed with the integration and and relay isolation.