Recent content by liberatetutemet

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    280ah Battery Top and Bottom Support Design.

    I ended up putting double stacked 1/8" aluminum flat stock and it is solid as a rock. I completely overbuilt this electrical system it never goes below 90%, but I have yet to run a laptop all day and watch TV at night, it's just a weekender out in colorado right now. I will post some...
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    Rover 40a MPPT voltage mismatch

    Interesting, thank you for your input.
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    Rover 40a MPPT voltage mismatch

    Every other meter and device I gave disagrees with the MPPT and agrees with the Klein though. But either way overcharging my li bank by 0.2v regularly that should be fine I suppose. I have a shunt BMS 2 meters and inverter all from different manufacturers reading 26.6...
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    Rover 40a MPPT voltage mismatch

    What's going on here? Is this defective? I have a shunt, bms, even a cheap voltage readout display all showing the exact same voltages and this is off by .2... I have no voltage drop all the way from the battery to the charge controller either.
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    Is something wrong with my mppt charge controller?

    I had the same thought when I loaded mine up on the phone. Very counter-intuitive. The app is kind or worthless, to be honest.
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    3D-printing a Simple Battery Box for 4 x 280 Ah Cells - anyone done this?

    heap64 did this for 24v 8s battery and it could be used to make a 12v as well. I printed one and made my own 24v battery, it's pretty slick
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    280ah Battery Top and Bottom Support Design.

    Have you had any issues with that longer bus bar heating up? I'm capacity testing right now and that bus bar is a few degrees above ambient and voltage is slightly low on those two cells I think due to resistance. My spacers are stainless steel washers stacked up. They cover the entire surface...
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    280ah Battery Top and Bottom Support Design.

    Exactly the same setup as OP. 24v 8 cells in series.
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    280ah Battery Top and Bottom Support Design.

    No there's a long bus bar that crosses over I just haven't cut it or drilled it yet. You can see it sitting there on the right. I am running my system 24 volt.
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    280ah Battery Top and Bottom Support Design.

    Finally got it put together. I waited for full assembly to start balancing charging and testing my cells because I didn't want them to expand uncompressed. Looks like I have a couple cells out of spec internal resistance. Going to try to get a partial refund and replace them later.
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    280ah Battery Top and Bottom Support Design.

    I am doing something similar. I haven I am doing something similar. I haven't put it together yet but I think the regular caps will clear.
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    280ah Battery Top and Bottom Support Design.

    the end plates for compression on this design does not have a ton of compression resistance, but you don't need a ton. If I had more time I would put aluminum flatstock across the whole thing on the outsides. You should link your build/design thread and post the files on thingverse as well.
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    280ah Battery Top and Bottom Support Design.

    Is it wide enough to do it laying down? You might be able to print them in 2 interlocking pieces but then I would want 8 allthread clamping per side
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    280ah Battery Top and Bottom Support Design.

    So I messed up my copper bar sourcing. Not surprising as I ordered components to assemble before the printing was really under way fully. I ordered pre cut bars from Midwest steel and aluminum and did not account for additional length to cross over to the next rank of cells. The required minimum...
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    280ah Battery Top and Bottom Support Design.

    24v. I'm still reprinting some more pieces for the 2nd set after some print failures (ran out of filament halfway through a batch, and the older printer nozzle clogged and completely effed that printer so had to build up a new printer). The new printer still has some kinks so the top caps aren't...
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