DC to DC Charger

[luvrbus]

I am above my pay grade on this so help me,I have 2 -110 Amp hour -12 V lithium batteries coming,? what is the best DC-DC charger to buy. I may be wrong but I was thinking a 20 amp charger would be sufficient for 2 batteries .
  Another question is will the solar charger need a upgrade ,I know the new inverter is not a problem 

[Van]

Check the Victron Energy site they should have what you need.
https://www.victronenergy.com/

[epretot]

Assuming your charge controller has an option for lithium, you should be fine.

Did you add any more panels?

As far as charging amps...the manufacturer of your battery usually list preferred charging amperage.

My SOK batteries recommend 40 amps maximum.

So in my case 20 amps would take twice as long.

[freds]

I have kind of come to the opinion that DC to DC from the vehicle to the house batteries is a waste of time and money if you have solar.

Given that we spend so little time driving verses stationary living. Though hey if your solar is ground deployed or you want an emergency backup it might make sense.

Also sort of came to the same conclusion for the hydronic heating system in the bus.