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  1. RCinFLA

    Noticed Forum is now tagging enclosure pictures with forum name.

    I have noticed that my enclosures are being tagged at bottom right hand corner with 'diysolarforum.com'. What legal advice did you receive causing you to do this? It would seem you are more likely to open yourself to copyright infringements if someone posts a copyrighted picture they clipped...
  2. RCinFLA

    LFP Cell testing

    I took the data posted by "Andy's Off-Grid Garage" and imported .csv files into Excel to produce attached graphs with additional important parameters noted. The graphs in the .pdf file are for two 304AH and four 280AH cells Andy provided charge and discharge .csv files. The graphs are on...
  3. RCinFLA

    PV array grounding, good, bad, and the ugly

    I am not a big fan of Mike Holt as many times he is like listening to a patent lawyer arguing engineering details, but I do agree with him on auxiliary grounding rods, particularly on PV panel arrays. The main contention is NEC requirements are dangerous.
  4. RCinFLA

    New Office air conditioner system installed

    New office air conditioners installed after Chinese province ordered electric power consumption cutback.
  5. RCinFLA

    JK 200A active balancing BMS battery current limits

    I did a thermodynamic simulation some time back on the 16S/24S JK active balancer BMS. I was not confident in my thermal resistance calculations on the irregular MOSFET epoxy plastic topside surfaces. Then I saw Andy's (Off-Grid Garage) video where he smoked the new 4S/8S JK BMS, drawing about...
  6. RCinFLA

    Checking a PV panel for open bypass diodes

    Panels subjected to regular shading conditions are prone to have blown out open bypass diodes. Bypass diode can fail open or short but most often they get overheated and fail open. A shorted bypass diode is easy to detect as Voc of panel will be low due to the shorted bypass diode shorting...
  7. RCinFLA

    Beware of brass bus bars

  8. RCinFLA

    Three methods to check your cell terminal connections

    Clean and dry surfaces with 91% isopropyl alcohol. Keep fingers off of contact surfaces.
  9. RCinFLA

    New Active balancer

    If you have not already seen, there is a new BT active balancer that is DC-DC converter to supercap storage similar to the much more expensive unit that has been on market for some time. It allows balancing to be restricted to near top end of charging so it avoids most of the cell overvoltage...
  10. RCinFLA

    Another 420 AH battery capacity test.

    'Offgrid Van Life' just release his final of three Youtube videos on his testing of the 420 AH cells. Same physical size as the 280 AH cells. The weight was actually a little less at 5.1x Kgs. The final numbers on four cells ranged from 240 AH to 244 AH. Surprise, Surprise. He jokingly...
  11. RCinFLA

    Extra current for top balancing

    I can recommend a relatively inexpense buck converter to triple your output current from a typical 30v 5 amp power supply for LFP top balancing. You can even use an old computer power supply 12v output to feed the buck converter. The buck converter is SZBK07 based on LM25116 synchronous buck...
  12. RCinFLA

    Li-Ion battery SEI layer, the critical process step in fabrication of Li-Ion batteries.

    A very critical process step in the fabrication of lithum Ion chemistry batteries, including LiFePO4 battery, is the initial formation of the Solid Electrolyte Interface (SEI) layer. It is crucial in protecting electrolyte from chemical decomposition facilitating long cycle life of battery...
  13. RCinFLA

    One of best 'everything you ever wanted to know' about cabling document

    https://www.victronenergy.com/upload/documents/Wiring-Unlimited-EN.pdf
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