Ok, here we are. I made it through all the posts and first of all I want to express my gratitude to all the valuable contribution made here. I learnt an awful lot and if I would have not read all this I probably would have destroyed my LFPs by listening to the advice I was given by the vendor.
What I am planning to now is the following:
Ensure that charging stops at 13.8V
Restart charging at 13,4 V
Wire a charge and a load bus
Have a HPBMS for LVC and HVC
not yet decided about the relays to fit
: I will go the Rotter route
and change the point of Voltage measurement from downstream the separation diode to upstream the diode once the voltage hits the 13.8V. I will also do the alternation on the field cable, take it outside of the alternator
and be then able to safely stop the it via a relay either automatically or manually if motoring long period. I have now decided to keep my two LA starter batteries to have flexibility with the alternator
in case of an HVC event during motoring.
I will change the programming so it matches the above mentioned values. My only question here is the following:
The charge and supply cable for the inverter
are the same. So I can only hook it up either to the load bus or the charge bus. I have seen recommendations in earlier post to hook it up to the load bus, but how can I than still cut it off in case of a HVC event? Coudnt't find anything in earlier post.
There is no way to get my solar charger
(Votronic) to stop charging at 13,8V. Minimum voltage I can adjust is 14.2. Thereafter it goes to float at 13,5. All not good. I see two options I have and would like to get your views on these options:
1. Use a programmable voltmeter and just switch it off once it reaches the 13.8 V threshold and switch it on at 13.4 V again.
2. Solder a Schottky diode into the cable downstream the regulator
. That way the voltage will be reduced by 0.3V and than meeting the thresholds (more or less :-)). If I do so, I wold not need to worry about the float at 13.2 V which seems generally be considered ok for the LFPs (if I didn't misinterpreted the earlier posts).
What are your views on this?
Greetings from Portugal