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  1. MattBarnesJCKS

    7s config balancing question

    Correct. That's my issue. How to keep it bottom balanced...
  2. MattBarnesJCKS

    7s config balancing question

    Thank you all I have an APC 1500BS (not sure, at work). It was the largest I could find at the time from Newegg that was not a rack mount unit. It has room for a 7s9p pack. My problem stems from 27V charging my batteries led to the first cell at 2V and the other 6 from 3.8 to 4.0.
  3. MattBarnesJCKS

    7s config balancing question

    I'm probably not asking this correctly, but how would I go about making sure each cell pack in a 7s configuration is bottom balanced? Right now, the 1500W APC UPS I am trying to use has a float charge voltage of 27V, making it practically impossible to balance. Any ideas? Thanks to everyone! Matt
  4. MattBarnesJCKS

    JCPowerPit

    Reverted back to a 3s80p brick for a 12V inverter. 4x4 grid of 20 cell holders (20 columns 16 rows)to allow for 2 empty rows between each pack of 80. Found a solar controller that will operate at both 12 and 24V. It's capable of threshold adjustments for the battery and charging voltages. I...
  5. MattBarnesJCKS

    JCPowerPit

    Agreed. Seems too much for a consumer. I'm going back to using my APC BR1500... lol. Anyone wanna suggest a price or make an offer? 8-) Thanks to all! I genuinely feel welcomed here.
  6. MattBarnesJCKS

    JCPowerPit

    I received a '96 model Liebert UPStation S. This is capable of 3.6kW and is a beast! It looks as if it was wired directly from the supply AC to a breaker panel, and the old batteries looked to be in a 24V setup. Will this, in theory, operate similar to a normal battery/inverter setup? Battery...
  7. MattBarnesJCKS

    JCPowerPit

    I am wondering what general opinion(s) is/are for 4s to 12V instead of 3s. Is there too much power loss stepping down?
  8. MattBarnesJCKS

    JCPowerPit

    I guess I will settle camp here. This is intended for (mostly from me) questions and (hopefully from all of you) answers regarding my power-bricks. The chosen name of a 'power-pit' is mostly inspired by brick, wood burningpit-grills and pork fat. I am currently at 3s60p 18650'sto power a...
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