On my motor yacht I want to replace the house bank battery 720 Ah lead acid with a 400 Ah LifePO4 battery. Currently I use a Sterling Power Split Pro R which after the starter battery has been charged by the 150 A alternator, charges the house bank. I also use a Sterling Power external regulator to optimise the output of the alternator. This works well. If I replace the lead acid by LifePO4, the external regulator is not suitable to charge the LifePO4 battery, due to the low resistance of the LifePO4, which will cause the alternator to continuously deliver maximum charge and will most likely burn out the alternator and possibly damage the LifePO4.
After having researched this situation now for a couple of months I know that the solution is to remove the Split PRO R and put a DC-DC charger between alternator and the two batteries. But most 24 V DC-DC charger can not deliver more then 50 A. Which makes my 150 A Alternator inefficient and charging a bit slow. You can add a second DC-DC charger in parallel to double capacity. The Quattro can serve as a LIfePO4 charger with it's special LifePO4 charging profile, but only when connected to shore. Out on the water the Quattro does not charge, unless I start a generator, which I do not have.
I thought of a different solution, to most efficiently use the Quattro while on the water. If I add a Victron Inverter 24/3000 Smart after the Pro Split R and feed the 230 V output to the generator input (AC in 1) of the Quattro, it should be able to charge the LifePO4 with approximately 125 A.
Will this work? Does anybody have this solution? Am I overlooking something? Ideas/suggestions?