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When the bms stops charging due to low temperature, the heating pins are switched on, the signal output is 2.95v and when under temp release value reach, signal lost. i use this relay: https://a.aliexpress.com/_mrfWiA2 the specs say that the opening voltage is 3.3v, but my relay also works at...

Has anyone updated the JBD bms firmware? i have 4 different jbd versions. 80A SP04S028 manufactured in 2022 -everything works great! 200A SP04S034 manufactured in 2021 -everything works great! 150A SP04S034 manufactured in 2020 -everything else works great but doesn't count battery...

Yes, is tied to the low temp protection parameter, switches on when the temperature reaches the limit value. It came as a surprise to me that this bms only has a signal output, no output for the heating pads, I had to build an extra relay as a switch and power directly from the cells

I'm most interested in the float voltage, the LFP doesn't need it, so isn't that 13.4 the most optimal in this case?

here are the profiles. Desulphation can be switched off, so the profile is two steps and there is no equalization.

I believe the Flooded charging profile for my MPPT controller is better than the lithium profile for my Lifepo4 battery, am I right? Flooded: Bulk/Abs. 14.4v Float 13.4v Lithium: Bulk/Abs. 14.6v Float 13.7v in addition, the dc/dc charger charges during driving 14.0/14.2/14.4/14.6v (which one I...

My BMS does not count cycles, other alarms are also not saved, only active ones appear in the list. Same thing with Xiaoxiang and overkillsolar app. Is there anything I can do?

Why only 20mV difference? The battery is in winter storage for 2-4 months every year, so if I want to keep the battery in balance, should I keep the voltage at least 13.6v in storage, or get an active balancer?

Do you mean that I keep the charging on for 24 hours at 13.8v voltage? Does it do the same thing as top balance? Can the JBD passive balancer balance as well as when connected in parallel? I don't want to disassemble the battery and charge again in parallel, if I don't have to. The battery...

Connections are ok. The cells are well balanced, the difference between 2-10mV when discharging the battery and 2-3mV at rest, the problem is only when charging. Could it be because I made top balance 3.6v, but now I charge them 14.2 V (3.55 V each)?

I did top balance for the cells, the cells remain well balanced at rest, and when the battery discharges, but when I charge (14.2v) the battery, 2 cells charge faster until the bms overvoltage protection (3.6v) stops the charging and the battery is not fully charged. Do I do top balance again...

... 2x12v heating pads, no battery.

Answering myself, I can put 2x12v in series in a 24v system. The signal voltage of almost all mosfets in Ali's product range is min. 3v, but the bms only gives 2.9v, can someone recommend what I should use as a relay?

I measured the port, it is only the control voltage, no current flows. So I use the mosfet relay to control the heaters. Next question, do 2 pcs of 12v heating pads connected in series work with 24v supply voltage, or do I have to buy 24v heating pads?

I'm not sure, hopefully both

I was wondering why the heating function of my Jiabaida BMS AP21S001 did not turn on, as my other BMS units do. I measured the heating port, it was only 2.9v, can I use the 5v or 3v heating pad as shown in the picture?

Any experience with these manufacturers? I have not heard before, I was offered the following: BAK 145AH, 57 usd/pc Greatpower 135ah, 46usd/pc All brand new

As I said, a dc-dc charger is exactly what I'm looking for, like the Renogy you suggested, but the problem is too high charging power for my outboard. I want to charge the LTO start battery first at least 14-14.3v and after that the amps go to the lifepo4 battery, this can be done with the orion...

Do you mean solar charge controller? it only starts charging when the input voltage is 5v higher than the battery voltage, it doesn't seem to work. I can't find links.

I think the Orion-tr Smart is the best for my use, but if the alternator overheats, any ideas how to limit the current?

Doesn't the fet isolator keep the batteries separate from each other?

Or if I forget the dc-dc charging and put a fet isolator, what happens when there are two lithiums of different chemistry, which one gets charged first?

Yes, I want to use the outboard alternator to charge the house-battery when the starter battery is full. At first I planned to use an Orion-tr 12/12-9A charger to limit the current of the outboard alternator due to overheating, but apparently this problem is only with high current alternators...

I have a 35Ah LTO battery as a starter battery in the boat, the charging current of the outboard motor is about 15A, is there any harm in putting an oversized dc-dc charger to charge the lifepo4 battery? For example, Orion-tr smart 12/12-18A. I want that charger because of the bluetooth...

For now, I only charge with the boat's outboard motor and shore power, later I may connect solar power.

Thanks for the answers Mr.Sandals and Hedges. So I make top Balance 3.65v, I set typical bms settings like 14.6v overcharge disconnect, but I charge the package with 14.08v.

Charging comes through the victron dc/dc converter where the set 14.08v. But what about that top balance does it really matter if it's made of 3.52v or 3.6v?

I am going to charge the 4s battery to a maximum of 14.08V to maximize cycle life. Is it worth making 3.52v or 3.6v as the top balance? What about BMS's overcharge setting, does it matter it is 14.08v or 14.60v?

My mistake, sorry. If I try to fit the springs, is an 80x20x2.5mm = 5.2kg/cm spring enough? I calculated it myself and got something like the car's spring class, I don't think it's right ?

If I don't want to use springs, how tight do I tighten them? I install the cells in a small box where there will be thermal insulation, so the springs can be challenging to fit.

Is it possible to calculate how tight the nuts are tightened with a torque wrench (nm) that gets a pressure of 300kgf? I have 4pcs 174x150mm cells, so the size of the pressure plates is 204x150x15mm (pvc) and four m6 rods. Does tightening have to be done when the cells are full or empty? I...

Like my original plan?:

Do you mean ALT->DCDC->LTO ? I thought the charger only works in one direction. What about starting current peak, can dcdc handle that?

Hi, I am planning to install the next configuration. Boat Outboard (18A charge) -> 35Ah 6s LTO-Battery to start -> 9A DC-DC Charger - > 160Ah 4s Lifepo4 Battery. LTO only works for startup, LFP for electronics. The question is, what happens when both batteries are full? DC-DC protects the...

Now completed the tests for each cell one at a time without bms. I charged the cells one by one to 3.6v and set the DL24P Tester cutoff voltage to 2.6v. Results with 9A discharge current: Cell1: 3.532-> 2.6v = 55ah Cell2: 3.496-> 2.6v = 55ah Cell3: 3.541-> 2.6v = 57ah Cell4: 3.498-> 2.6v = 54ah...