Recent content by forscience

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    BMS showing different Voltage than Shunt

    Here is the amazon link to my charger. I did notice that the amount of amps it outputs decreases by quite a bit when the battery is nearing full so I don't know if that means the charger is able to regulate its charging voltage to something else than 14.6V all the time. As for the smart shunt...
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    BMS showing different Voltage than Shunt

    My charger is set to 14.6v by default and can't be adjusted. Could I just keep an eye on it and unplug the charger when I see a 14.0 reading from the BMS?
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    BMS showing different Voltage than Shunt

    So do I stop charging when the battery reaches a non-nominal 14V or is 14V the nominal voltage that it's supposed to settle to sometime after being fully charged?
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    BMS showing different Voltage than Shunt

    I think you're right! I turned the charging button back to on and now the voltages are consistent! I just thought I should keep the charging button to off when I'm not charging. Have I done any damage by using the battery with the charge button on off? I can hear a humming noise perhaps coil...
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    BMS showing different Voltage than Shunt

    Here are couple pictures I managed to take, but I don't think you can tell anything from the clutter. I did loosen the nuts on the bus bars in these pics so that's not what it's like when fully connected. I'll report back with voltage measurements when I get some time this week.
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    BMS showing different Voltage than Shunt

    The charge button was automatically switched to off after the battery voltage hit 14.6v during charging. The screenshot was taken shortly after a full charge. The highest temperature I've seen was 32c which is well below the over temperature release and it never been below freezing.
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    BMS showing different Voltage than Shunt

    Sorry I forgot to point out that the fuse is before the main switch so it's the closest component to the battery positive.
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    BMS showing different Voltage than Shunt

    Room temp is about the same. This is a plastic ammo box. Could it heat up even when there's no load because of this voltage difference?
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    BMS showing different Voltage than Shunt

    I will do that when I get some time this week. The max load I use is 80W which I think should be ok for the time being. So the extra resistance could be from loose wiring?
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    BMS showing different Voltage than Shunt

    This is a portable system I put together in an ammo box so I basically will need to disconnect a lot of the wirings in order to take a picture and it will be hard to get the details in the picture because there are a lot of wires in a very compact space. Are you trying to spot a loose...
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    BMS showing different Voltage than Shunt

    Here is my post of the wiring diagram. The only difference is that instead of the 3x 8AWG wires connecting the BMS, it's 2x 6AWG wires. The shunt has a positive lead connected to the positive terminal of the battery.
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    BMS showing different Voltage than Shunt

    My BMS is showing a different voltage than my victron smart shunt. What could be the cause?
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    Does a LiFePo4's charge rating lower as capacity degrades over time?

    I see that most LiFepo4 cells have a charge rating of 0.5C which means for a 100ah cell, you can charge it at a max of 100ah * 0.5C = 50 amps. Since after a certain amount of cycles, the battery cells will degrade to only 80% of its original capacity, does the max allowable charging amps(50a in...
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    Are there any downsides to charging LiFePo4 fast?

    It's not a SCC, but an A/C adapter that plugs into a normal wall outlet(link). I plan to charge it about 2 times a week. Though my cells are not grade A cells and are probably at 80% the original capacity; would this lower the 0.5C charge rating?
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    Are there any downsides to charging LiFePo4 fast?

    I have a 12V 100ah LifePo4 battery connected in 4s. On Amazon, I see a 14.6V 40A charger and a 20A version. I'm tempted to get the 40A charger, but am not sure if charging that fast will degrade the battery more and cause any heat issues. I'm using 2 AWG wires with a 120A fuse so I'm not too...
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