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  1. scott harris

    Jk bms balancing issues

    What is 3m cloth?
  2. scott harris

    Check scc with power supply possible

    Ok, OK mega mea culpa. I did have the SCC connected backwards. I checked at the panel but at the SCC which i had wrong. Everything works now I'm sorry for wasting everybody's time. But I thought I would post some pictures of my project as it may make you smile.
  3. scott harris

    Check scc with power supply possible

    Pi, thanks so much for your help Battery 26.33 Solar 0, always 0 even at noon Absorption. 28.8 Float. 27.6 Mattb4 I am getting 45.6 volts at 6pm. Would have been higher I guess at noon
  4. scott harris

    Check scc with power supply possible

    Pi, thanks so much for your help Battery 26.33 Solar 0, always 0 even at noon Absorption. 28.8 Float. 27.6
  5. scott harris

    Check scc with power supply possible

    Yes. The polarity is correct. I double checked it before connecting.
  6. scott harris

    Check scc with power supply possible

    Thanks, The battery is 80% full so there is room to charge. And the SCC is enabled. I think the problem must be with the panels or the SCC. I am just trying to determine which. Is connecting a dc power supply to the SCC a good test, or will it be a problem?
  7. scott harris

    Check scc with power supply possible

    I have a victron 15/75 scc connected to my 24v battery and two renogy 175 flexible panels connected in series. The victron powers up due to the battery power but does not charge the battery even though the panels are unobstructed and it is a nice sunny day. I'm not sure if the problem is with...
  8. scott harris

    Sol-ark 12k canbus necessary?

    According to Sol-Ark the way it is supposed to work is that the bms sends signals via canbus sa the battery nears the top and this causes the solark to reduce the charging level until eventually it is zero. But solark already knows the pack voltage and has a maximum voltage setting for the...
  9. scott harris

    Sol-ark 12k canbus necessary?

    Oops. I made a mistake. Not SOC but pack voltage level.
  10. scott harris

    Sol-ark 12k canbus necessary?

    I have a Sol-Ark 12k and a DIY 48v 280AH battery with an overkill bms. Overkill does not have a canbus port. Is canbus really necessary. Won't the solark control charge/discharge via SOC
  11. scott harris

    Will hot water on snow covered panels cause thermal shock?

    OK, the final tally is: DON'T DO It !!!: 14 Should not be a problem: 2 Do it and let me know what happens: 1 Use your shotgun: 1 Since my motto is: "It's better to ask stupid questions than it is to do stupid things" I think that I will refrain. Thanks for the help.
  12. scott harris

    Will hot water on snow covered panels cause thermal shock?

    Ok, so it is my first winter with my solar panels and as expected they are now covered in snow. I have the ability to redirect water from my hot water heater to an outside hose bib. Should I just hose them down with hot water, or is this going to break the panels?
  13. scott harris

    Blue Sea Fuse Block: 32VDC really?

    Great response. And the video gives me an idea. I think I will blow a few 3 amp fuses, some at 32 volts and some at 60 volts to see if there is any difference.
  14. scott harris

    Blue Sea Fuse Block: 32VDC really?

    I bought a Blue Sea fuse block for my 16s 280AH battery build. It is the one with 12 terminals, 30 amps per terminal 100 amps per block. Its purpose is to provide protection for low power items like the alarm horn, bms, pack voltage sensor/relay etc. But i see on the specs on the back of the...
  15. scott harris

    adding a small kicker cell to a 16s battery? 16s+1

    good point. But if I started out with the compound cell at 20% and the others at 10% I guessing that I would not have any problems.
  16. scott harris

    adding a small kicker cell to a 16s battery? 16s+1

    hmm, now that you mention balance, I'm wondering if balance would matter at all. Since the compound cell has a larger capacity it would neither be the first cell to reach the top nor the bottom. Is this right?
  17. scott harris

    adding a small kicker cell to a 16s battery? 16s+1

    So the plan would be to not include it in the compression box, but just to put it to the side and wire it in parallel to the weak cell using heavy wire and ring terminals. No bus bars. good plan? bad plan?
  18. scott harris

    adding a small kicker cell to a 16s battery? 16s+1

    I have sixteen 280AH cells which I plan on using to make a 16s 48v battery. My problems is that one of the cells is weak, 265 AH. But I also have a spare 60 Ah cell. Can I just add that in parallel to the weak cell to make up the difference. Sort of a 16s with a small kicker? Thanks,
  19. scott harris

    Trolling motor battery in a fat 50 ammo can

    It's a 12v battery. That is 23.19 amps at wot, or close to it if I remember correctly.
  20. scott harris

    Trolling motor battery in a fat 50 ammo can

    There might have been a bit of wind that day. I'll test it again in the spring when the ice on the lake melts. But it will be close to what I observed before. Those Minn Kota motors with the digital maximizers are very efficient at low speeds. A word of advice though. This is not a...
  21. scott harris

    Trolling motor battery in a fat 50 ammo can

    We (two men in an inflatable raft) moved along at about 2.5mph (trolling speed) using 3 amps of current.
  22. scott harris

    Trolling motor battery in a fat 50 ammo can

    Minn Kota Traxis 45
  23. scott harris

    Maximum and minimum charging and discharging for Lifepo4 battery

    When doing a capacity test I accidentally charged a 280AH cell to 3.98 volts. Did I do any permanent damage? There was no bloating.
  24. scott harris

    Xuba Electronics: DEAL - 280AH LiFePo4 cells. Purchase & Review

    I bought 16 Eve 280 AH cells from Amy in September. Delivered mid November and just getting around to testing them now. So far, not impressed. I am capacity testing them from 3.65 to 2.50 volts at 18 amps (0.064C) and I haven't got one to test at 280 AH yet. Some only 276 AH. At this low of...
  25. scott harris

    Optimal temperature for battery discharge.

    It's known that LiFePO4 batteries can safely discharge between -20 and 60 degrees C, but what is the temperature at which they discharge most efficiently? And does 10 degrees either side of this temperature affect the efficiency to any significant degree?
  26. scott harris

    problem with capacity tester?

    The voltage drop is not between the battery and the tester, the voltage at those two points is the same. (I am using 10 guage wire and the length is only one foot. I am using ring terminals on all four ends.) The drop is between the input of the tester and what the tester displays. I might...
  27. scott harris

    problem with capacity tester?

    I have one of those Chinese capacity testers with the fan. I have used it in the past to test 60 AH and 100 AH batteries without problems. Now that I am testing 280 AH cells at 18 amps (max I can get it to go) I noticed that the voltage displayed on tester is 0.3 volts less than that measured...
  28. scott harris

    Is CV charging (adsorption) even necessary?

    So this is the nub of my question. When I set my power supply to 3.65v no load, it charges at 10 amps when the cell voltage is low, but slews down to just a few amps when the battery is about 75% full. What I am trying to accomplish is to charge continually at 10 amps until I reach my desired...
  29. scott harris

    Is CV charging (adsorption) even necessary?

    I plan on using this method for individual cell testing only. When assembled into a battery for daily use I will range between 3.0 to 3.5. But now these are new cells and I am trying to establish a baseline for capacity which I am doing between 2.5 and 3.6. Since this is only being done once...
  30. scott harris

    Is CV charging (adsorption) even necessary?

    I am charging each of my 280 AH cells to 3.6 volts in order to do a capacity test. I use a non-programable bench charger capable of 10 amps. Setting the power supply at 3.6 volts and waiting for the current to drop off takes forever once the charger is in CV mode and the current decreases...
  31. scott harris

    Cell internal resistance (what does it mean)

    The problem was with the calibration. The video helped a lot. The printed instructions that came with the meter; not so much. I now get 0.11 to 0.12 m Ohms for all cells. One thing the video did not mention is that when you touch the probes the white wire should connect to the white wire...
  32. scott harris

    Cell internal resistance (what does it mean)

    Why not use compressed air?
  33. scott harris

    Cell internal resistance (what does it mean)

    Yes, the video from Amy and my measurements do not match even though we use the same model of YR meter. My readings are about 10x higher. even after cleaning with scotch brite. I have not used acetone yet. I think that I will go get some and see if that makes a difference.
  34. scott harris

    Cell internal resistance (what does it mean)

    Thanks for your advice. I scuffed the terminals with scotch bright. It lowered the IR but not to the factory readings. I now get readings centered around 1.55 m Ohms. I am thinking that there is a problem with the meter. Do you get repeatable measurements with your meter? My measurements...
  35. scott harris

    Cell internal resistance (what does it mean)

    The video from Amy showed my cells 280AH cells range between 0.13 to 0.18 mOhms. That did not look so good so I bought a YR1035+ to measure them when they arrived. All have arrived now and I measured them with the YR1035+ (the same type of meter as in the video) and get measurements ranging...
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