From: muratlanne@gmail.com   
      
   "Bob La Londe"  wrote in message news:vekfri$1dhm6$1@dont-email.me...   
      
   Same here except 36 volt for the boat.  I wish they had a 12V with   
   cranking amps high enough for a starter motor.  I've also been thinking   
   about getting a couple high cap 12s for the travel trailer.  Highest   
   peak loads would be the brakes in an emergency I reckon.  That   
   continuous capacity would be nice to have.   
   Bob La Londe   
      
   ------------------------------   
   LiFePO4 amd AGM both charge at 14.4V and float around 13.3~13.6V, so they   
   can be paralleled while charging or discharging to have the high starting   
   current capacity of AGMs of perhaps less Ah capacity and cost. Their   
   discharge curves are somewhat different, LiFePO4 stays above 13V while AGM   
   quickly drops to 12.6V, so I'd disconnect them during storage so the Li   
   doesn't slowly run down trickle charging the AGM.   
      
   https://communityarchive.victronenergy.com/questions/119423/mix-   
   gm-and-lifep04.html   
      
   A clamp-on ammeter that measures DC would be very useful to understand how   
   the two batteries perform when paralleled, especially when on a low current   
   maintenance charger.   
      
   The simple way to accommodate their different long-term storage   
   characteristics would be separate maintenance chargers. The LiFePO4 charges   
   to 14.2~14.4V and then stops accepting current, the AGM continuously draws a   
   small current at its ~13.6V float voltage. I don't know the consequences of   
   floating the Li partially charged at the AGM float voltage, which will   
   depend on the output of the float charger. I build my own with volt and amp   
   meters and don't have experience with commercial ones.   
      
   Before connecting them in parallel you should charge both to ~13.6V to avoid   
   a large current between them.   
      
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