diy solar

diy solar

Recent content by Dedou

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    How to configure the JDB heating pins (JBD-AP21S001)

    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...
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    JBD BMS Firmware Updates?

    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...
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    How to configure the JDB heating pins (JBD-AP21S001)

    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
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    MPPT Charge profile

    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?
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    MPPT Charge profile

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

    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...
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    JBD doesnt count cycles

    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?
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    Top Balancing "How to"

    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?
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    Top Balancing "How to"

    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...
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    Top Balancing "How to"

    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)?
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    Top Balancing "How to"

    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...
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    Low voltage heating port

    ... 2x12v heating pads, no battery.
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    Low voltage heating port

    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?
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    Low voltage heating port

    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?
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    Low voltage heating port

    I'm not sure, hopefully both
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