diy solar

diy solar

Search results

  1. P

    Last fire.. :-(

    This is why for a mobile application I look for some structural vibration isolation in the overall mounting (i.e. a flexible sheet of plywood) and all crimped cables eliminating rigid bus bars. The cheap grade B cells I bought arrived with some swelling so I'm trying to accommodate what is...
  2. P

    Last fire.. :-(

    The Sportmobile Forum has a popular addition which is an aluminum storage locker where the OEM spare tire would be located. It is certainly possible to allocate this as a 200-300 amp-hour battery pack. https://www.sportsmobileforum.com/forums/f19/diy-aluminum-underfloor-storage-6034.html My...
  3. P

    Last fire.. :-(

    So after reading up on various issues with LiFe battery construction for my mobile 200 amp battery I decided on a primarily metal construction to include an aluminum heat sink with a steel compression structure to maintain a 12 psi force across the cells. I also used some G-4 fiberglass on all...
  4. P

    Last fire.. :-(

    If what you are trying to discourage is, melding solder into the end of a stripped piece of wire before crimping, then I would agree. Compared to for example marine wire, the very thin amount of "thinning" (I do not have a spec) is going to have almost zero mechanical effect on a crimped wire as...
  5. P

    Last fire.. :-(

    If you rule out "tinning" altogether then you are ruling out most if, not all marine wire which is generally a higher quality wire than automotive wire. Please be more specific about wire type and what failures you think to occur with thinning or more specifically marine wire.
  6. P

    Last fire.. :-(

    The typical marine-grade wire is Tinned factory wire. I don't know the process but by inspection, the "tinning" is very thin and not the result of the hand soldering iron with a roll of solder. I would much prefer marine grade wire that is tinned over the non-tinned wire for solar applications...
  7. P

    DIY 200 Amp-hr LiFePO4 Van house Battery with steel compression and thermal

    This has gotten even more elaborate because of the limited space I want to stick it in. Including chargers, shunt and equalization circuits for buss bars. I got tired of it and stepped away about a month ago. Need to get back. There is an aluminum heatsink cover for the whole battery enclosure...
  8. P

    The Big Misconception About Electricity

    Well he was entertaining :)
  9. P

    The Big Misconception About Electricity

    What happens when you ask home work questions with "simplifying assumptions"
  10. P

    Ordered 8 EVE "new" 280Ah cells from Shenzhen Luyuan

    I ordered Qty 32 of the same at the end of Aug and shipped Early Sept. Took to the last day November. Lots of issues with shipping beyond sellers' control but otherwise all cells look very good and the same 2 cells per box shipping.
  11. P

    Class T vs ANL fuse

    I have not read this yet but it looks like a great primer on fusing. https://www.eaton.com/content/dam/eaton/support/austria/downloads/Handbuch_Fuseology_Overcurrent_protection.pdf This Ohms law stuff is so eeaccy
  12. P

    Class T vs ANL fuse

    FYI, These are still apparently available. The ad says "Slowblow" but the JLLN is the "Fast blow". https://diysolarforum.com/threads/cheap-source-littlefuse-class-t-fast-acting-fuse.31955/
  13. P

    Cheap Source LittleFuse Class T Fast Acting Fuse

    Just an FYI for frugal shoppers. Littlefuse is a top name in fuse technologies which include Class T fuses. https://www.littelfuse.com/products/fuses/industrial-power-fuses/class-t-fuses/jlln/jlln110.aspx You can find them on Amazon for $48.99...
  14. P

    Which is better test for new batteries

    This avoids having to obtain the knowledge OP is currently not in possession of.
  15. P

    60a DC-DC Charger only pulling about 40a

    All the self-proclaimed geniuses here can continue living in their safe spaces of delusion; for the rest: Alternator Considerations for LiFePO4 If you decide on LFP, it is best designed and installed as a system. A good system design will almost always include an alternator installation that...
  16. P

    The Big Misconception About Electricity

    You have a far higher chance of lighting a bulb using static electrical charge (2-4Kv human model for ESD) and although I have seen blue ESD sparks there is not enough energy to heat an incandescent bulb filament. This is the reason for his assumption that one election is enough to light the...
  17. P

    The Big Misconception About Electricity

    This is speaking from a model theoretical standpoint (a part of formal logic), if two models predicts the same thing they necessarily include the same inner model.
  18. P

    The Big Misconception About Electricity

    This is a classic of example of "Those that can Do (EEVblog) ; those that can't teach(Veritasium)! Based on the EEVblog's video, the answer to the question posed(by Veritasium) basically has nothing to do with the video (i.e. Poynting vectors and field theory) that describes the supposed...
  19. P

    The Big Misconception About Electricity

    Thanks for the keyword; very interesting. https://www.reddit.com/r/holofractal/ After only a very brief look, the main distinction I would say is rooted in the debate about mathematical realism. In a nutshell, is mathematics simply a human invention to describe nature? Is mathematics something...
  20. P

    How to deal with uneven placement of compression springs?

    My solution to the compression problem for 2P4S cell configuration. I used 1"x2"x11 GA steel rectangular tubing to create the strong back and side structures to hide the all-thread and 3 1/2" compression springs. The 12 psi load is distributed across 8 springs that have 0.75" deflection which is...
  21. P

    The Big Misconception About Electricity

    That is very true, but in looking at this more closely after many years (I took E&M I/II in the late 70's) I realize that the figure produced in the video is representative of an inner model of the most fundamental principles we have in the formal principles of logic and in fact as a model of...
  22. P

    The Big Misconception About Electricity

    Before we get too overly technical (fat chance on that), We only have to look at different methods of actually measuring current to realize that the Poynting vector (and E&M waves) and the current in the wire are synonymous (i.e. if-and-only-if (iff) dependent in the model ). Using one method to...
  23. P

    The Big Misconception About Electricity

    Click bate generates more clicks.....
  24. P

    The Big Misconception About Electricity

    I keep coming back to the view that in this circuit, the Poynting vector is a model of the physical E&M process about the perfect wire, while Ohm's law defines the boundary conditions of the actual power in the source and load. So when we look at this particular circuit example, we...
  25. P

    The Big Misconception About Electricity

    Unfortunately, I think this your example is getting away from any point I can absorb. More from Wikipedia: gives an expression for the Poynting vector: which physically means the energy transfer due to time-varying electric and magnetic fields is perpendicular to the fields This quote...
  26. P

    DIY 200 Amp-hr LiFePO4 Van house Battery with steel compression and thermal

    Pictues showing the initial assembly using the thermal pads.
  27. P

    DIY 200 Amp-hr LiFePO4 Van house Battery with steel compression and thermal

    I have just completed the complex part of building a steel compression fixture for my Van application. That is it with the cells still need to be wired to the BMS but all the mechanical is done except for the actual mounting in the Van. The assembled unit with the light grey Hardy board cover is...
  28. P

    The Big Misconception About Electricity

    Isn't the light an energy sink? I would assume that the graphic was generated from a numerical integration package that would compute the fields from an idealized circuit. You said before "It's a misuse." Where or what it's abusing the model?
  29. P

    The Big Misconception About Electricity

    Having read a little more, it would seem that the video is pushing the illusion that the energy travels in the fields and not the circuit and that somehow despite the lengthy extension of the wire. the Poynting vector is going to take the shortest path and avoid the long circuit. Yes, the...
  30. P

    The Big Misconception About Electricity

    I'm not sure why you think the Poynting vector does not apply in general? The vector is the basis for the Poynting Theorem which is an energy balance in terms of the vector. The theorem does not only apply to free space. In words, the theorem is an energy balance: The rate of energy transfer...
  31. P

    The Big Misconception About Electricity

    My mind is not blown by the physics but by how this graphical representation so precisely matches one of the most fundamental innermost models of our most formal logic (i.e. the propositional calculus).
  32. P

    The Big Misconception About Electricity

    I think the notion that we understand the underlying physical processes is a fallacy. Even if we are the best-known model in quantum mechanics and string theory we don't know the exact physical process we only have models of these processes. Ohms law is one such model as are Maxwell's and...
  33. P

    The Big Misconception About Electricity

    I'm not sure what would be pseudoscience in this video, but it also doesn't know what would constitute (as the title suggests) a "misperception" about electricity? Is it that Maxwell's equations should be not to apply to a simple electrical circuit. That there is some common belief that Ohms...
  34. P

    The Big Misconception About Electricity

    I'm having to reach back a long way into my E&M I& II classes and I'm not even sure I can find the textbook but I'm finding this video fascinating the further I dig into it. Even if we simply view it as a 3D visualization of a complete set of fields and E and the M field circuits for the...
  35. P

    The Big Misconception About Electricity

    That would perfectly explain why they never taught the concepts this way in my EE undergraduate program. I vaguely remember the Poynting vector but it was probably in E&M II and although there was an association between Maxwell's equations and a generalization of Ohms law these concepts were...
Back
Top