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  1. IamIan

    Could someone help me figure out this HONDA BMS?

    not yet 100% .. but .. For anyone who has one of those OEM BMS 12s boards , and wants to put it to some use. Sense they come 'included' with the $265 for 1.1kwh LTO module .. it's not a bad deal .. battery cells and cell level voltage monitoring...
  2. IamIan

    Could someone help me figure out this HONDA BMS?

    FYI A little bit of progress with 1st gen Honda Insighter's using them for PHEV conversions. https://www.insightcentral.net/threads/honda-fit-lto-bms-discussion.125085/ Some BMS board swapping is available if you still want / need non-duplicates.
  3. IamIan

    A123 AMP20M1HD-A Battery pack kit

    As requested .. Attached are some pics of the two 24s kits .. and the initial dry fit of the two of them into the modified 2000 Honda Insight IMA battery case .. Will be adding aluminum fins between cells .. which will fill the remaining side to side gap in case. Project is not yet 100%...
  4. IamIan

    This is how A123 care about quality control

    "May" does not = will "May" does not = promise to Tomorrow I "may" offer someone a PB&J sandwich. That does not mean I will ... that is not me offering the sandwich. If I don't offer the sandwich that still completely fits with what I said I "may" do. I think this approach of yours is counter...
  5. IamIan

    A123 AMP20M1HD-A Battery pack kit

    1st Got my two recent 24s kits a little while ago .. :mrgreen: ... absolutely beautiful .. coodoos/props. :mrgreen: - - - - - What are others' thoughts on folding the battery tab around to increase the surface area in contact between the two tabs? A bit of added hassle and complication ...
  6. IamIan

    a123 20ah decipher date code puzzle

    As mentioned on the other thread .. the initial 2 characters are always SH .. the 3rd character has only been seen as one of 4 options ... A , B , C , D SHA SHB SHC SHD
  7. IamIan

    A123 20AHr Pouch Cell Battery Build & Info Thread

    Keeping in line with the code from the other 56 cells I have ... and other cell serial #s I've seen floating around the web ... using the above as an example. My guesses are bellow ?? but they are just guesses. SH = Location code of production A = the quarter of the year ... all the cells...
  8. IamIan

    Can Loopwheel use HubMotor?

    No ... $ to high , but the idea has some appeal. The mid-drive would be a nice option to remove the double complexity of having the motor in the loopwheel itself ... sadly I don't have funds to burn either... just a thought exercise for fun.
  9. IamIan

    Can Loopwheel use HubMotor?

    Although I agree with the concept of low practicality ... introducing other problems ... etc. To answer the question of 'why' ... #1 Because I was curious I don't see why not ask , talk , or think about it ?? #2 Compound benefit -- Niche The 'Loopwheel' concept can be added for additional...
  10. IamIan

    Can Loopwheel use HubMotor?

    I did a quick search and didn't notice relevant hits. Does anyone have any experience or thought on combining the principle of the Loopwheel with a small Hub motor ? - - - - - - - My first thought ... Aside from the added complexity and cost (of course) ... is that , it should be a viable...
  11. IamIan

    A123 AMP20M1HD-A Battery pack kit

    Fair enough. Note. Bellow Is not trying to convince anyone of anything , nor criticize anything nor anyone ... Just explaining myself a bit is all. For an equal Volume, yes. It varies of course for different Alloys , but Here is a crude example I got years ago. By weight Aluminum is more...
  12. IamIan

    A123 AMP20M1HD-A Battery pack kit

    Out of curiosity. Have you yet ( or ever intend to later ) test/quantify how much of a difference in conductivity this will make?
  13. IamIan

    A123 20AHr Pouch Cell Battery Build & Info Thread

    Just sharing / passing along some testing data. One aspect that seemed interesting to me ... is the minimum sustained / trickle current rate for the A123 20Ah cells. There are some people who insist that LiFePO4 cells can not sustain a slow trickle charge rate ... but I see a problem with...
  14. IamIan

    A123 20Ah Pressure Thoughts--and bits for experiments.

    A study I found a bit ago that kind of goes into some of the technical side of the gas formation itself. Link
  15. IamIan

    A123 20AHr Pouch Cell Battery Build & Info Thread

    An alternative ... PVDF like Kynar is Piezoelectric ... Kynar Thin Films are fairly easy to source down to 0.001" thick
  16. IamIan

    Prius Batteries - How to make them work

    The crude method is to measure the change in voltage dV from the resting voltage to the voltage under a specific load. More advanced methods include the use of AC current system in order to try and compensate for some of the non-ohmic effects that cause dV... the AC method is more complex to...
  17. IamIan

    Prius Batteries - How to make them work

    They don't have a higher or different overall voltage profile from normal NiMH ... but due to the unusually low internal resistance and such ... the same signature events that one sees in other NiMH cells are much harder to see in these HEV NiMH cells ... keep in mind the high levels of...
  18. IamIan

    Prius Batteries - How to make them work

    good stuff. :) Just keep in mind ... the swelling happens after you have already passed 100% SoC ... so by the time you see the swelling pressure deflecting the sides you have already slightly overcharged a NiMH prismatic cell. But... luckily NiMH is very tollerant of abuse like over charging...
  19. IamIan

    Where is everyone from? Meet and Greet? Visit and Compare?

    I am in Cranston RI... just south of Providence... Bike shop reaction to FrankenBike was great... :lol:
  20. IamIan

    Prius Batteries - How to make them work

    Do yourself a favor and buy used ... not new. Then test the pack ... pull out the best subpacks / parts to use for your pack... if the rest are good enough use them for something else. Used Prius battery packs can be had from salvage yards starting at ~$300 for the whole pack. Testing is easy...
  21. IamIan

    Prius Batteries - How to make them work

    Just to expand a bit more detail on this.,, and how the ~10 year old NiMH tech batteries compare to modern A123 cells. ( ~10 year old NiMH ) similar to Prius ------------------ Modern today available LiFePO Gen1 Insight & Civic -------------A123 ( 26650 ) has : Energy Density: ~139 Wh per L...
  22. IamIan

    Prius Batteries - How to make them work

    yup.... sorry typo ... thanks for catching it... I'll correct... but that 3 mOhms per cell includes all the 120+ interconnects for the whole pack as well... so the individual cells are even less than 3 mOhms.
  23. IamIan

    Battery Comparison 36V versus 72V

    If all other variables are equal... higher voltage has to give a longer range... an equal amount of Watts of power comes from less Amps of current ... resistance losses are directly related to the current flow , not the voltage , or watts of power... 72V discharging at a 5 amp rate gives 360...
  24. IamIan

    Prius Batteries - How to make them work

    I agree NiMH still has potential... and they have proven to be one of the most tollerant of abuse batteries on the market... They are often times over charged and over discharged in common usage ... and in Hybrids they are usually under used staying above 20% SoC and bellow 80% SoC... of course...
  25. IamIan

    Build your own CD battery tab welder for about $100.00+-

    great stuff :D :mrgreen:
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