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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

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

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?

This is possible, but what also strikes me is that the minus pole of that cell is a different color than the other cells, meaning that at least they are not the same batch. Yes, i do that if i don't send them back.

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...

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...

good that i took the video when i opened the package so they can't claim i have caused the thermal damage.

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...

Yes it is so that 2 cells have a lower capacity, another test done and still a capacity is 55ah. Cell voltage after test. 2.747 + 2.713 + 3.079 + 3.044. Next I do a test for each cell, after that I try to get a refund for the price, probably useless what I’ve read, I still try.

... 2x12v heating pads, no battery.

Heat discoloration as-received, before you used it? -Yes After top balance and allowing them to sit, did you double-check voltage of cells individually? It is possible they didn't get top balanced well. But, that should show up as low cell voltage according to BMS. -After top balancing, i let...

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?

Is there an oversized bms problem? I ordered 4pcs 230ah EVE cells (max discharge current 1C) and 200A 4s JBD BMS, currently the consumption is 100-300w, but in the future if I want to use more than 2000w. Is this configuration safe to protect cells?

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Like my original plan?:

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...

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?

How close should the current drop when top balancing? I have 4x 90Ah cells as a patient. On the first try, I charged the cells in parallel at 3.60v (8A charge) and stopped charging when the current had dropped to 0.020A then I waited 1.5 hours, switched to series and did a capacity test with the...

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...

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...

I'm not sure, hopefully both

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.

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?

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

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.

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?

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...

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

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...

Thanks for the answer. Yes, the continuous discharge is 1C. I know it gets adjusted in the settings, I'm just wondering why buy a smaller bms when this bigger one can be adjusted to the same level. I thought if there was anything wrong with the bigger one vs. smaller.