[Jack Houpe]

I'm a fan of Victron, not only do they offer user defined but have presets for AGM, Lead acid or Lithium. My configuration is different from others as I have 48vdc bank for my Growatt inverter and then I use two Victron MPPT solar chargers to charge the two 8d house batteries and the two 8d engine batteries from the 48v batteries. This unit will do Lithium and  you could have it float at what ever voltage you want that way your echo charger can keep the engine batteries at a higher voltage.

https://bluemarine.com/products/victron-...pgEALw_wcB