Nice design and write up of a rather complex complicated LIFePO4 system.
I see KISS was thrown out of the window in fact it looks like it was thrown out of a window on the top floor of the Burj Khalifia.
As an electrical and electronics
engineer I love the design, write up and the diagrams BUT for sure most of this I see as unneccessary for MY BOAT.
LIFePO4 just like LA does not like Over or Under charging.......seems to me that the need for these systems has not been 'seen as neccessary' for LA batteries as to why we need to install all that complex circuitry for LIFePO4 batteries well I just don't get that or agree that is is neccessary never mind wanted on a cruising boat certainly not on mine.
Just another simpler way of doing things.....KISS. Also I am NOT Looking for an argument here. as to which system is 'best'
THIS IS My System you can design yours to meet your wants desires needs.
NO changes to the alternator it is a Delco Remy 10SI with external sensing.
I still have the Diode splitter for the house and engine
start batteries and I do have in a cupboard somewhere a Sterling no loss battery splitter (never fitted)
I have Four 200A seperate house batteries WTS 200A cells in a 4S configuration
Each 200A battery has a BMS and Cell boards from EV-POWER
A much nicer (marine) solution that the House power one IMHO.
start battery is still LA, an AGM
8D and the biggerst change I have made is to ramp
up the switch off voltage on my two Blue Sky Solar
Boost 2000i controllers to cut off the charging just under the BMS OVC voltage.
IF or when the AGN battery dies I will use a LIFePO4 battery and I 'may' put another diode in the circuit so it can never experiece an OVC unless a cell went bad. So that IF all three or four of my 200A batteries simultaneously went off line while the alternator was charging that would not kill the alternator......
However read my previous posts despite the alternator main feed wire breaking AND also on a seperate event the diode bock inside the alternator coming loose (both when charging) the alternator survived these events
with absolutely no damage......
So while theoritically it should have blown the diodes as every one will tell you 'must happen' that was not the case.
For sure that lovely complex complicated system and lovely write up and diagrams is only going to convince the undecided masses that LIFePO4 is not for me.
There seems to be a lot of wrong headed thinking here about what is 'needed' for a sucessful LIFePO4 installation. After all it is 'just a battery' one that offers a lot of benefits to cruisers but is surroded by mistique and rules that you must follow.
I have no issues with the complex solution it just does not fit in with my mindset. A year down the line I am very happy with my LIFePO4 house bank so happy that we 'now' only use 400AH regularly, 200A is stilling happy out of circuit for a year now in a 4P configuration at 3.25V and the other 200A is avaiable at the flick of a switch and is also sitting at 3,3V per cell 13.2V I have no cell balance issues whatsoever.
Almost any decent electrician who understands boat wiring
would not be overawed by my system...that said the few that have looked at my installation don't understand the ins and out of cell boards and BMS's......asking one of these guys to look at that complex system......would be an interesting exercise and IF or ONCE you sell the boat ....... is that sort of LIFePO4 system going to attract buyers or scare them off.
Nice system nice write up and diagrams on a nice boat
but there are for sure more than one way to skin this particulat cat......saying that LIFePO4 is a great battery system for a Cat.....the sailing kind.