diy solar

diy solar

Recent content by Mark44

  1. Mark44

    3 x 4s batteries need charging question answered

    Folks, I am down to the last items with a long awaited battery bank. I have now 3 fully configured 4S batteries (280 AH each). :eek: Putting them in parallel, using 0 GA wire to connect them. (I was going for 4 batteries, but one has Gremlins, and also space in limited.) :alien: :cry: So ...
  2. Mark44

    AliExpress order

    And patience is once again rewarded. When shipping half way around the world, 70 days which includes several modes of transport seems pretty good to me. YMMV. Good luck with your cells. I have finished construction of four 12v 280 ah batteries. Now in testing stage. Pics to follow soon, along...
  3. Mark44

    AliExpress order

    Glad you got your money back, and sorry it did not work out for you. I do hope that you get them, and that things get settled with the vendor.;)
  4. Mark44

    Charging lithium via 7 pin wiring harness

    If you have additional concerns, I think you could always put a heavy weight diode in to prevent backfeeding form either side. Your plan sounds solid to me, but hey I'm just a retired old white guy!
  5. Mark44

    Charging lithium via 7 pin wiring harness

    The 7 pin is only good for a trickle charge. The wire is so thin that amperage will be very low. The DC-DC converter will allow for more direct charging, but if you are charging the batteries otherwise (generator etc.) I don't think you really need to count on the 7 pin connection for charging...
  6. Mark44

    Has anyone built a batt bank without solar?

    I am building exactly this right now. I will have 4 12V 280 AH batteries when I finish configuring them. I will be able to configure either 24V @ 560 AH, or 12V @1120 AH. I am building a charger using Server PSU's from Ebay, and a Buck/Boost converter to make that right. My end game is to...
  7. Mark44

    AliExpress order

    Once again, patience is rewarded! Glad you got the info. now to wait for the boxes. Kind of like being a kid at Christmas all over again!?
  8. Mark44

    BMS or ID10T issue?

    Update! Looks like that was it. I now have a "2000 watt" invert running (actually only claims 850 running watts, and I am only testing it at 50, so Things are looking up. Now to test the battery by drawing it down, and then recharging to see where we are with capacity. If all that works, I...
  9. Mark44

    BMS or ID10T issue?

    Found it! The SWITCH function on the function page keeps reverting to "on" which prevents me from witching discharge on. Reset now. Fingers crossed this will work. setting up for inverter test.?
  10. Mark44

    BMS or ID10T issue?

    So, good news/bad news. I found a loose connection from the B- side of the BMS board, and fixed that. My app. will not allow me to put the battery in discharge mode? The temp, and voltages seem within range, but when I try to turn on the discharge switch, it goes green for a second, then...
  11. Mark44

    BMS or ID10T issue?

    OK I have seen both ways talked about and debated, thanks for your input. I think you have a point that neither charge or discharge is unlocked and the app is showing locked, so I will work on that. Thanks again.
  12. Mark44

    BMS or ID10T issue?

    Have not been able to find an answer to this, so sorry if it exists. Just completing my first battery build. Getting ready to close up the case, and all of a sudden the voltage reading at the terminals is way way off. Wiring sequence is: Battery- --> shuntB- --> shuntP- --> B- on BMS -->P-...
  13. Mark44

    AliExpress order

    Understood (about frustration with waiting). Consider that the time scales we are enduring are beyond what we are used to. But since we cannot just drop round to the Big Box store and pick these up, we are at the mercy of the shippers, even more than the vendors. My first order had me pretty...
  14. Mark44

    Baby steppin' into RV Solar via Generator and Power Banks

    So i did not see many replies to this. I hope you have found that there are a number of threads on here that deal with that. Also some u-tubers out there have exactly this in their libraries of videos. I, in fact am working on this issue for myself. Please DM me if I can assist as you go...
  15. Mark44

    Cheap Charger

    I hate to ask, since you are being so forthcoming, but do you have a diagram? (I learn better in pictures! ;))
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