![]() With regard to the questions on your diagram.ġ. My trailer has a box mounted on the frame - just aft of the tongue - where the 7-pin cable comes in as well as a positive lead directly from the battery. Once you pull that down you may find an ideal location to put the shunt. The Coroplast on the underside should come off easily if it has been fastened with screws. The factory fuse box will remain 12 VDC, and that other fuse box will take whatever voltage I upgrade my battery bank to. I am adding some 12/24 VDC accessories that will receive power from this fuse box and not the other. The fuse box on the top right is separate from what I just mentioned. I was surprised to see a 6 AWG wire from the fuse box to the frame, and something similar from the battery negative to the frame. I think my RV DC fuse box that came with the RV is wired to the frame. I used to think the shunt had to be on the battery negative terminal, but a few days ago I had an epiphany that it only had to be the first thing on the negative circuit.Īlso, if you are putting a board like this in your travel trailer, you can always run the battery wire straight to it so you can hook to the shunt first and then send the power back to the factory ground or negative power distribution point. I spent quite a lot of time and effort trying to put it there. The batteries will go in the black tray on the bottom.Ī whole lot of reading and lot of question asking will make the shunt perfectly clear. The Shunt is on the board on the bottom right. ![]() I've got the battery cables done and many other wires to add. I thought the whole purpose of a BMS was to cherish the poor LiFePO4 in the first place.This is how I'm installing my shunt. Now, the answers up to now are basically saying that one should keep the SmartShunt in place, because the built-in BMS of most batteries are less reliable and more inaccurate than a SmartShunt. That's why I conjectures that a SmartShunt (or BMV-712) becomes unnecessary, because the BMS takes precedence anyway. I also learned that the Cerbo GX stops being the controller of the charging process, but that the BMS takes over (of course, assuming that the BMS and the Cerbo are compatible). Without a BMS LiFePO4 batteries would die, explode or do other unpleasant things. Then I learned that LiFePO4 batteries are sensible snowflakes which require their own tailor-made BMS which is either integral part of the battery or must be added externally. However, I had been under the impression, that one could simply throw out a lead-acid battery, drop in a LiFePO4 battery, adjust the configuration of the Cerbo to the new battery according to the specifications of the battery and that would be it. different bulk, absorption, floating voltages, different charging current, etc.). Of course, I was aware of the fact that they are using different cell chemistry, that due to that difference in cell chemistry both have their specific advantages and disadvantages and that they require different charging strategies (i.e. Until a few weeks ago, I had been thinking that lead-acid and LiFePO4 batteries were basically the same, i.e. ![]() Reading the answers I confuses me even more. Is there anything I miss?Īddendum on Sep 23rd 2023 due to answers up to now The BMS communicates with the Cerbo GX and reports the internal cell status, SoC, temperature and requests the optimal charging voltage/current from the Cerbo GX.ĭoes this imply that the Smart Shunt (or BMV-712) becomes unnecessary? IMHO, the BMS should be able to report all the values (and more) which the Smart Shunt does report. ![]() However, in all cases the BMS must be compatible with the Cerbo GX. Victron's own LiFePO4 plus Lynx Smart BMS or smallBMS). From my understanding LiFePO4 batteries require a dedicated BMS which is either integrated into the battery (most vendors) or is external to the battery (e.g. Maybe, in some future the lead-acid battery will be replaced by a LiFePO4 battery. I am currently planning a system with three MPPTs, one Phoenix charger, a Cerbo GX and a Smart Shunt (or BMV-712 Smart) with an external battery temperature sensor.
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