You mean something like this?
Add a Junsi Cell Log 8s and you'll be good to go(so you can see the cell voltages. The BMS monitors the cells but has no read out.). What works for ME
is: 4 Winston 700 amp cells, Cell Log Monitor
, House Power BMS, Balmar
120 w MC614 Reg(main engine), Zena 150 Alt w Balmar
MC612(DC gen), Sterling Pro Charge 60 (shore power).
I'm finding my pack is converging on voltage rather than diverging. Top balance your cells initially and you'll find the BMS becomes just another monitor
. I have my BMS set to alarm
for LVC and HVC the only loads/charging cutoffs it's capable of (at this time, until anything else is deemed necessary) is shutting down the main engine alternator
(disconnects the "ignition lead" to the MC614).
I have all of my charging sources set at 13.8 v Bulk/absorbtion and 13.2 for float (still analyzing the float V) I find with this setup my cv=3.43 to 3.46 after a full charge, with the greatest imbalance going to 53 mv during charging. As soon as the pack is hit with any discharge the individual cells come back to within 3-6 mv. My Link 10, Cell Log, Inverter
, all have alarms or LVC Plus all of these and the charge sources are only ran while onboard.
Some here will try to make you believe that using these cells is rocket science and/or dangerous voodoo only to be undertaken by the most mad of all lunatics. So I am not a rocket scientist and that only leaves the later. Unlike all of those who will chime in here, who have never had their hands on a LiFePo cell but read a "paper", I've experience a 700 amp cell shorted. I did it myself and it was no fault of the chemistry, and while it produces copious amounts of smoke and a bit of heat, IMHO it was way safer then the exact same thing in FLA. (the PVC case bursts (not explodes) from expansion and the heat didn't even melt the case)
Bottom line, IMHO, is that in "house service" it's just not that complicated. Although I grant that if I were going to sell or install these for someone I would approach it with all of the bells and whistles also.
Call me Mad, a Lunatic, a Fanboy, but call me a guy with a 700 amp LiFePo battery pack that's functioning. Oh my god the sky is going to fall and I'm going to H*** for sure. The armchair experts can rip me up now.