Search results


HUGE range of batteries & accessories at www.batteryhookup.com 5% coupon "POWERWALLS"
  1. H

    Recommendations for small charge controllers with real MPPT

    As I'm learning about solar, I'm trying to design some small systems for practice, for my shed or self-contained power pack or bike charging, ect. I also am a fan of multiple redundant systems anyway, so even when I get to the point of having one big system for the house, I'll still plan on...
  2. H

    Powerwall shelf building on the cheap

    Everybody's powerwall build is going to be different, and everyone's budget is different, but I thought I'd bring this up. I'm planning my build in modular packs using the 4x6 18650 cell holders, on shelves for each series. Turns out reclaimed pallet boards are exactly the depth needed for the...
  3. H

    Small scale transmission inverter, does it exist

    If I set up a solar array I need to place the panels as close to the battery bank as possible to reduce transmission losses. I should also look at wiring in series to up voltage to also reduce transmission losses. Otherwise I have to sink a ton of money into cable cost. Industry-scale solar...
  4. H

    Excess LiPo salvage options

    As I make regular pickups from computer repair shops in my area, to salvage and process 18650's, I am taking everything they want to get rid of. This has included a lot of flat packs of lithium polymer batteries so far. I have opened a a few to start, to get a feel for it, and the short story is...
  5. H

    Super sketchy, totally DIY, low budget wind generation experiment

    I got on the forum for all of it's awesome resources having to do with using secondhand lithium cells, and I know that nearly all of the readers are solar users. Solar is great. And yet, building wind generation just had such an appeal to me for the last few months. I've learned enough (still so...
  6. H

    Nickel fuse sheets + busbars

    Still in the planning stages of my big powerwall, working out the details. I was leaning towards 24p packs using 4x6 cell holders and I like the nickel fuse sheets from Battery Hookup. So one side positive, one side negative, daisy chain them to get my series connections, yada yada... My...
  7. H

    Thermal switch recommmendations

    I'm using a small-ish 3s lithium ion pack to power some outside shed lights, nothing too complicated. I want to have a better pack for next winter and I want to keep the batteries warm when it gets below freezing. There are suggestions for building out a large battery storage with insulation and...
  8. H

    1S BMS for small projects

    The TP4056 is technically a BMS. Super convenient as well, as you can charge with the built in USB. I came across some other 1S versions as I am exploring small projects that I can do with my low-value cells, for practice and experience. Lots of different options, let me link a couple... Here's...
  9. H

    Why is Opus never finish charging some cells?

    As I am doing my primary charging of salvaged laptop cells, I have had about 4-8 cells in the past week that my Opus charger is trying to overcharge. These have almost exclusively been the red Sanyo cells. They have passed my first voltage check, being recovered at above 3V, meaning none of...
  10. H

    Low current charging hack - what am I missing?

    For salvaged cells of a moderately low voltage, say 3-3.5V, it's generally recommended to do a first slow charge using only about 250mA current. The TP4056 module uses 1A charge current. If I parallel 4 cells to charge off 1 TP4056 module, each one should get the recommended 250mA. Am I missing...
  11. H

    How long can I sit on these?

    As I had mentioned in my introduction post, when I started approaching this whole thing as a hobby, I unexpectedly got a massive haul of about 2000 decent cells for free from laptop packs. Now I gotta actually turn the hobby up to 11! While building a powerwall is definitely a goal, I plan on...
  12. H

    Late intro from Michigan

    Sorry, I've made a few posts already but I'm only just now getting to the intro post. My bad! I love hands-on learning, building everything yourself, and doing it wrong to learn the right way. As long as I don't blow myself up. Safety first! I started exploring DIY turbines and cell harvesting...
  13. H

    System monitoring options, low end

    I'm planning out a small build and a small wind system for practice and learning experience. I'd like some advice on monitoring equipment, low end, basic. If I eventually go full off-grid, I know that a dedicated BMS like Batrium is gonna give me whatever data I need on the battery, and complex...
  14. H

    Need input on small scale generation bank size

    I've finally hit a wall, after scanning the internet for weeks and skimming nearly every thread on this forum, and I would love some outside input. Even if the input is just "stop what you're doing, dumb idea"! (ok, maybe not, I'm still gonna keep trying, but at least with a more realistic...
  15. H

    Adding a fan to testing/charging station?

    I used an ATX power supply to plug in my 1 Opus and 3 Liitokala as I am charging, testing and sorting reclaimed laptop batteries. I am using low currents on the first charge prior to the self-discharge test, and higher currents once I weed out the bad cells. So far I got only 1 or 2 "heaters,"...
  16. H

    What's the difference between charge controller and buck converter? For microgeneration

    Short question is in the title. Allow me to give details as to what I am looking for. I have ideas for building microgeneration systems, plural, and I am looking for individual components. In addition, I am looking to fully understand what every component of the system does, so I've got plenty...
  17. H

    Selecting BMS approach on my first build

    Hello, and thank you in advance for help. I am planning my powerwall build, and I have all the components understood and managed, but I'm having trouble wrapping my head around the correct approach to BMS that I should use for my system. Design is based around used 18650 cells, all used and...
Top