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diy solar

Recent content by PhotonFire

  1. PhotonFire

    Any cool Battery Monitor/Info Display panels?

    What is "the sense" that you mentioned for tracking? More importantly, what does that have to do with this thread. Do you mean that the app can read from RS485 port on the junktec? Could you show us how you got that working, I have no idea about any about what you said or how it works...
  2. PhotonFire

    15AH LiitoKala 33140 LFP review and test results

    Did you or do you top balance your cells? Some alligator clips would work but I dont have 64 of them available, not even 32 or even 2. I noticed the terminals extend past the cell cases, so I am thinking about laying out a strip of aluminum foil and standing them up vertically in parallel on...
  3. PhotonFire

    15AH LiitoKala 33140 LFP review and test results

    At full speed the motor will take 1500W from a 52V 16S battery pack. That would be around 35mph. That is constant when riding at top speed on pavement. For off road then the speed varies a lot. I have been trying to measure the internal resistance with what I could rig together. I got a new...
  4. PhotonFire

    15AH LiitoKala 33140 LFP review and test results

    My trusty old 20 year old digital multimeter said 16.12 miliohms, it was a decent quality meter from it's day with diode and current testing. I have a new $35 multimeter coming in the mail but that is a month away at best. I just got the 2nd one so I can calibrate my new bench power supply a...
  5. PhotonFire

    15AH LiitoKala 33140 LFP review and test results

    It is a battery operated digital multimeter so that should be a DC measure, I don't have any fancy equip for AC resistance. Those are some great tips, thanks doggy. When I touch the probes together they zero out so the wire resistance should be adjusted for already. I will be discharging with...
  6. PhotonFire

    Stuck on Pack Design - Help Please?

    Since you soldered on copper wire, a terminal block would be a good alternative to the copper bars. https://www.aliexpress.com/item/1005002129345754.html
  7. PhotonFire

    Stuck on Pack Design - Help Please?

    And you can use wider nickle strips as well. Copper carries more current but nickel can be spot welded with a $20 welder and a car battery.
  8. PhotonFire

    15AH LiitoKala 33140 LFP review and test results

    Received the cells and they are all identical and the date says 11/21 so these were stickered within 2 weeks or less of my ordering them. All at 3.23 volts give or take 0.01v. So they match very very well from their 1st appearance, the shipping took 6 weeks from my order date and the shipping...
  9. PhotonFire

    15AH LiitoKala 33140 LFP review and test results

    I have a $20 little spot welder and 2mm nickle strips coming soon that I will modify for longevity and 32 33140 cells. I have to say, your experience spot welding them is definitely not welcomed news. I will still give it a go though!
  10. PhotonFire

    15AH LiitoKala 33140 LFP review and test results

    How about tinning the copper really quickly with solder and then trying to spot weld it? What kind of bus bars do you have that can 1,000a without having holes blown into them?
  11. PhotonFire

    15AH LiitoKala 33140 LFP review and test results

    Today the price is 20% higher than the OP, $8 is now $10- at least with shipping to Canada anyways. Nobody tried the $16 DIY spot welder on these? (note this needs a small resister mod and possible isolating the logic chips) https://www.aliexpress.com/item/32836588140.html I saw a video...
  12. PhotonFire

    Cheap power supply for top balancing (tested and works well).

    You could use a shottky diode to force the energy in the battery to stay in the battery. This will also work for connecting 2 battery packs together that at different SOC, either for charging or for use in an Ebike or RV, etc. Diode I ordered the SBR60A60CT these have one 30amp diode on each...
  13. PhotonFire

    Any cool Battery Monitor/Info Display panels?

    Why does it matter if the relay is attached to the BMS or if it is external? Makes no difference in terms of idle power consumption. There is no free lunch. If you dont want to use any current to run a relay, then this configuration on the Junctek is what you want, because there is none...
  14. PhotonFire

    Severe capacity degradation of 280Ah cells -- warning!

    robby that post gave me a smile. Interesting theory for sure but slowing down youtube? What is next, forcing a 3 day delay on emails to make the post office less boring? By speeding up lectures offered on youtube or any other server that speeds at 1.25x or greater, if that creates more...
  15. PhotonFire

    NEWBIE here! Please help!

    Wish I would have seen this before I ordered. The equivalent of 8 BattleBorn batteries $8k, was $360 shipped. It said DHL shipping which should have taken 1 week. Instead I got the 17track link. Update: The $360 of batteries are on sale on Nov 11 for just $224 with free shipping. It is...
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