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  1. R

    26650 build

    Prepping for V3.0 16s96p of 1536 LiFePo4 26650, so ~288AH @48vdc or 13.8kwh, 12kwh real world. I will try a 2x3 configuration of the battery holders. I shall have to see how well they link together and avoid tipping over. It looks like Cura V5 has improved the print speed from around 4hr to...
  2. R

    26650 build

    Nearly ready for deployment of battery #2. 16s80p of 1280 LiFePo4 26650, so ~240AH @48vdc or 11.5kwh, 10kwh real world. 3d printed battery holders. PLA+ printed the best. .15 nickel 26650 mesh for spot welding the neg side. batteryhookup 18650 fuses cut to a square of 4 for cell level fusing...
  3. R

    26650 build

    My biggest problem is warping on the print. It is a major headache. I should be able to get 4 on my print bed, but when I go above 3 it starts curling and breaking things. So far I have only limited success in overcoming it. I used TinkerCAD because I didn't want a steep learning curve. I...
  4. R

    Charging speed

    I have LiFePo4 26650 cells battery 16s around 270ah with a solark 12k charger/inverter. The solark is fairly sophisticated, monitors power flows and can send power to load, battery or grid. I get about 4 hours of strong sun with pretty sharp tails due to shading. When I observe the charging...
  5. R

    26650 build

    I created 3d printed holders. Lots of learning about 3dprinting, but I hope that I can recover the cost of the printer by what I save in no buying holders. My new holder design locks together, which should make a stronger build. My next version will probably be a 16s80p. I need to improve the...
  6. R

    26650 build

    I have built a 16s64p LiFePo4 from 26650 cells. I purchased 4x4 battery holders from ebay. 2x 18650 battery fuses from batteryhookup.com .1 and .15 nickel strips A Kerpu spot welder (a bit weak) and 97/3 rosin core solder to solder the nickel strip to the buss bar. 2AWG and 1/0 as buss bars...
  7. R

    First build questions

    I have 9 of 16S completed. It will be a 64p 16s with 1024 26650 LiFePo4 cells all tested to have >= 3100mah capacity for ~9kwh total. I used 18650 nickel fuse cut into sections of 4, so they would reach the positive tab. Then use 2 AWG loop as a buss bar. I was unable to reliably spot weld...
  8. R

    Fire Proof Containment

    Any one put one of these at the top of your battery pack/enclosure? https://www.amazon.com/Automatic-Extinguisher-Mounting-Bracket-Suppression/dp/B074KZDNKY
  9. R

    First build questions

    Battery build starting back up. Proposed Version 3.0 I have over 1000 tested 26650 LiFePo4 cells. All >3100mah Overkill Solar 100A, 16s, 48v BMS on order. 110A 48v Bussman circuit breaker 16s64p in a 4x16 battery block. pos.: .15 x8mm nickel strip across each four which will be soldered to a...
  10. R

    First build questions

    That is an impressive picture. I can't really tell about your wiring schematic, but you need to wire the NTP in series. All current needs to go through it, and that is the problem because they get hot. Here is a picture. You can see I have two of them in series and one of them is damaged and...
  11. R

    3.2v 26650 LiFePo4 testing

    What discharge rates do you consider to be high current? When does the effect of the Internal Resistance start to become significant? rearden
  12. R

    3.2v 26650 LiFePo4 testing

    Anyone found a similar switch for the LiitoKala Lii-500? Just wanted to make sure before I shell out cash for the Opus. rearden
  13. R

    26650 build

    Thank you for that information. So if you change the switch, then the voltage charging and discharging profile will be dampened so that it will not exceed 3.7v? and 3.7v is acceptable for 3.2v lifepo cells? Will the capacity testing cycle also stay within specs which will not harm the cells? A...
  14. R

    26650 build

    Pulled apart a bunch more battery packs, I am up around 1000 cells. 26650 3.2v LiFePo4. Some are old, but I am having a hard time finding a tester for 3.2v.
  15. R

    3.2v 26650 LiFePo4 testing

    Anyone have any recommendation on equipment to test 3.2v LiFePo 26650 batteries? I have a Lii-500 but it only seems to do 3.7v testing. I have looked on Amazon and Ebay, but everything I have seen so far only seems to charge 3.2v but not do capacity testing. rearden
  16. R

    SolarEdge (SE7600A-US) Inverter and custom battery pack?

    Anything new on using a StorEdge inverter with a DIY pack? Is there an appropriate affordable BMS which will talk to the StorEdge? rearden
  17. R

    Grid Tie Inverter with battery options?

    Thank you for these suggestions! I will take another look at the Conext. I did not know about the Outback GS. It seems to be certified. At first glance it appears to do what I want, but approaching twice the cost of the StorEdge. $4300 for an 8kva outback vs $2400 for 7.6kw storedge. I think the...
  18. R

    Grid Tie Inverter with battery options?

    I do want a lot, and a Pony! You are correct that 3-phase is different that split phase. What I was most interested in was the admission that they needed to open things up to support 48v batteries from the general market. I think StorEdge does exactly what I want to do, except for the...
  19. R

    Grid Tie Inverter with battery options?

    I am investigaring inverter systems which will do: 1.Grid tie 2.Split phase 110/220vac NA power or have reasonably priced accessories to do so. 3.~5000VA continuous, with significant surge to start motors, including HVAC compressor, stackable and expandable. 4.Efficiently route (excess) solar...
  20. R

    26650 build

    16x of 4x4 cost ~$30 so twenty something cents per cell for a holder. 12g wire and 16 cell per home run. I checked my math, you are correct, that is light and I need to increase it to 10g, double it or only do a string of 8 per 12g run. By my calculations, 640 cells in 16s40p (48v) config at...
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