Hello folks,
Another beginner set of questions while wiring Rec ABMS with a single 12V/560ah pack in 4S2P configuration.
Inline Fuses: The reseller I bought the Rec ABMS from (@the_colorist ) was suggesting to fuse battery connections Cell+ 1-4 for safety. I also saw a suggestion from someone to do same for the BMS main relay DCH (RELAY DCH F) that attaches to the battery Pos site. I understand that the last one already fused internally , but it’s just a matter of convenience to replace the inline fuse first, instead of inside the BMS. My contact is away and I am looking for the recommendation on the proper fuse rating for the above connections.
Because I had to extend the length of the Main Relay DCH NO wire to reach the pre-charge unit, I also used a wire with the inline fuse(holder). Same I had to do for the Cell1- wire. Would these extensions work, and if so, again, what fuse rating I can safely use for both connections?
With my Rec BMS order I got the Contactor and 500Amp-50Mlv Shunt. What I can’t locate is information on the direction of the flow for those. Does it matter which side of the Contactor unit I will attach the POS from the battery and which post on the shunt from the NEG battery cell 1 will go?
Last question I have about the lithium cells I have and the initial charging. I bought 8 of 280Ah EVE cells from Ali in Feb 2021, as I thought my RV build will progress much faster. But due to different delays I am just now getting to the electrical part. Those cells were shipped at 3.29V each, and still shows the same voltage now. They were not charged over a year and four month now. Neither I top-balanced them, since my reseller said the ABMS will balance them (eventually). I have been reading in these forums that ABMS may not trigger charging/balancing if the cells are too low. Is there any BMS settings recommendations you can suggest to ensure that the balancing/charging process will commence when I power the unit on? I got at least couple of month before I can start using my Van. Just fyi, my battery will be connected to Victron Cerbo GX, Orion-Tr Dc-to-DC charger and Mutltiplus 3000 12v inverter. But for now only Multiplus will be supplying shore power from the household 15A plug.
I would greatly appreciate the helpful comments, I am trying to do my part in research and reading but sometimes the very basic info still hard to find. Thanks a lot in advance.
Another beginner set of questions while wiring Rec ABMS with a single 12V/560ah pack in 4S2P configuration.
Inline Fuses: The reseller I bought the Rec ABMS from (@the_colorist ) was suggesting to fuse battery connections Cell+ 1-4 for safety. I also saw a suggestion from someone to do same for the BMS main relay DCH (RELAY DCH F) that attaches to the battery Pos site. I understand that the last one already fused internally , but it’s just a matter of convenience to replace the inline fuse first, instead of inside the BMS. My contact is away and I am looking for the recommendation on the proper fuse rating for the above connections.
Because I had to extend the length of the Main Relay DCH NO wire to reach the pre-charge unit, I also used a wire with the inline fuse(holder). Same I had to do for the Cell1- wire. Would these extensions work, and if so, again, what fuse rating I can safely use for both connections?
With my Rec BMS order I got the Contactor and 500Amp-50Mlv Shunt. What I can’t locate is information on the direction of the flow for those. Does it matter which side of the Contactor unit I will attach the POS from the battery and which post on the shunt from the NEG battery cell 1 will go?
Last question I have about the lithium cells I have and the initial charging. I bought 8 of 280Ah EVE cells from Ali in Feb 2021, as I thought my RV build will progress much faster. But due to different delays I am just now getting to the electrical part. Those cells were shipped at 3.29V each, and still shows the same voltage now. They were not charged over a year and four month now. Neither I top-balanced them, since my reseller said the ABMS will balance them (eventually). I have been reading in these forums that ABMS may not trigger charging/balancing if the cells are too low. Is there any BMS settings recommendations you can suggest to ensure that the balancing/charging process will commence when I power the unit on? I got at least couple of month before I can start using my Van. Just fyi, my battery will be connected to Victron Cerbo GX, Orion-Tr Dc-to-DC charger and Mutltiplus 3000 12v inverter. But for now only Multiplus will be supplying shore power from the household 15A plug.
I would greatly appreciate the helpful comments, I am trying to do my part in research and reading but sometimes the very basic info still hard to find. Thanks a lot in advance.