if you're insisting on using the zener diode to regulate, resistor depends on how much current your device uses. Without knowing the device, it's impossible to tell what resistor is needed.
If using as a OVP device, you don't need a resistor, making usage easier.
eccerr0r
Solder Sloth
Last Activity: Today, 10:18 PM
Joined: 11-08-2012
Location: CO
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normally these high wattage zeners are not for regulation, rather they are for OV protection...Leave a comment:
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hmm. 40A seems a bit optimistic then... yeah heatsinking is necessary to hit 40A but it's on the wrong side of mosfets...Leave a comment:
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Do also consider your video card as a potential issue...
Looks like this is an analog only monitor like my old 17" that I bought when they first came out...Leave a comment:
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[ATTACH=JSON]{"data-align":"none","data-size":"full","data-attachmentid":3620257}[/ATTACH] "2.3"...
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and interesting... I have a chinesium 40A 4S Li-ion Co/Mn BMS that has 10 mosfets on it. The weird part is that it actually spent the effort and designed the PCB to dissipate heat from the balancing resistors...though still probably can't dump more than a few watts or so.
Too bad it's not good for Fe cells....Leave a comment:
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Well, glanced through a couple sections and it's exactly how I envisioned it, pretty much has the same concept except done via software as an all analog version I had posted somewhere. Yeah the digital version is nice because you can easily change the constants as needed. I don't think I'll be going this route, at most I'll probably manually balance if the bms doesn't already have a 100mA balancing function ...
Speaking of which I would have thought it should do the balancing current as a ratio of the capacity of the pack, other than heat dissipation I wonder why it's otherwise.....Last edited by eccerr0r; 04-21-2025, 01:03 AM.Leave a comment:
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Going to try hard not to have to buy more stuff, but batteries I cannot make out of resistors and capacitors. I have some 75N06's that I could use, technically I could just outright replace them and get a bit better performance.Leave a comment:
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Because 30BY5 looks like a vacuum tube part number :p
60N06 above the 30BY5 is a reasonable part number based on the photograph, unless that was meant to be something else..
60N06 has reasonable specs for a prot mosfet... though might not be enough for reconfigure for lower volts and more amps.Last edited by eccerr0r; 04-20-2025, 12:39 PM.Leave a comment:
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your picture has a cut off picture of the MOSFETs? Trying to extrapolate the cut off portion of the photograph... but if it's really 60N06 something doesn't seem quite right... or maybe it is...Leave a comment:
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6 x 60N06? hmm...Leave a comment:
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Since you have it open can you read the parts used for the mosfets? I'm wondering if I do end up modding for 12V I'll need to add some more mosfets. 15A would mean I don't have to but would be nice to discharge at 1C... meaning now 12A at 12V.
Oh an *#@(#**%#@#!#. I have a 2A wall plug that was oddly enough 29.2 volts. I modded it to 25.2 volts... I wonder if I need to mod back though I'll have a need to use both voltages...
Then again this 24V PSU I just fixed I probably could somehow hack in some CC/CV support, and technically it probably would be a little more efficient...Last edited by eccerr0r; 04-20-2025, 01:12 AM.Leave a comment:
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Well at least that's 5Ah. hmm.
I wonder if it really can take 15A... though I guess it depends on the kind of mosfets that are being used, and the cell health of course...Leave a comment:
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interesting... going to be annoying to reconfigure then... but still, balancing needed to be done somewhere or were these packs never intended to be balanced -- which is hard to believe....Leave a comment:
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But wouldn't that mean you have to take the pack apart to access the interstitials? You can't connect the bms protection wires without opening it, and it must be able to balance as-is else that's a recipe for leaking magic smoke...?...Leave a comment:
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Theoretically the drop of charge and discharge should be pretty much the same, assuming no active balancing which I don't expect. This looks like passive balancing, and would need to do so if the interstitials aren't ported out...Leave a comment:
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That's not very promising that it can't take 1C charge..and only can discharge at C/3 ?Leave a comment:
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Yes if it were fully charged it'd be closer to be balanced with the internal top balancer...
Hmm...curious what else is on the pack, then... temperature sensing would be nice...Leave a comment:
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Well at 25.something the risk is there, if it were 28V then they should be closer to 3.5V.
Well I'd be happy if these things could do 1C, though 2C would be great but won't ever try to go that high. Test Test Test Report!...Leave a comment:
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Ah... in #88, 25.something could be 25.1 and it would be around 3.14vpc. But this would be average so some could be below 3...Leave a comment:
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