• Howdy! we're looking for donations to finish custom knowledgebase software for this forum. Please see our Funding drive thread

Search results

Date Relevance Most replies

  1. C

    High performance & durability Cannondale Semi Recumbent

    > Tubeless tires with sealant are a time-consuming hobby. We already have a hobby. Yup If you do it wrong. Or want to experiment. > Did you ever stop to consider why no other vehicle with pneumatic tires routinely uses the stuff? It's a huge nuisance. There are limited applications where...
  2. C

    Why do Fat-tires have higher rolling resistance?

    A few days ago, mikesee posted a rolldown test of two different 5" tires on snow at 4 PSI, 2 PSI and 0.5 PSI. While the test is for aiding tire selection for the ITI, the results observed illustrate how two tires can be different and how much of a difference PSI makes...
  3. C

    High performance & durability Cannondale Semi Recumbent

    Given the various ideas in the thread to address this, I believe it would be far simpler - and has a proven track record - to do what the mountain bike riders do - go tubeless with sealant: Most go tubeless to lose the tube for a more supple flat/contact patch, so they have better grip...
  4. C

    Why do Fat-tires have higher rolling resistance?

    There's more to it. You go fat for more grip (steep climbing, braking, mud, wet grass), float on sand or snow (grip, weight spread out on a larger flat patch; we're starting to see 6" tires for extreme snow/sand), plowing through more obstacles (branches, rock gardens) without a pinch flat or...
  5. C

    Fatbike BB torque sensors and weird sizing.

    When first out (March 2014), the Mongoose Dolomite came with a 100 mm BB and a spindle of 189 mm. Some quality YST bearings were nice, but the spindle was soft, and long, and a number of reports of getting bent. But no cartridge BB would fit (with the stock straight crank arms). Then someone...
  6. C

    connections for? EcityP Smart S5-13 BMS

    ECityPower supplied connection jpg now we're safe
  7. C

    connections for? EcityP Smart S5-13 BMS

    may have to go there It appears that the cell harness connects as expected, with RC1 through RC12, starting with RC1 to the positive of the lowest cell and proceeding upwards. The far right odd wire, that traces to R36 to the power FETs' Sources, must go to the lowest cell's negative, the pack...
  8. C

    connections for? EcityP Smart S5-13 BMS

    FETs are n-channel doesn't add up putting all Drains to battery negative - must be a different design than the other BMS they make extra R between cell management harness extra lead and dual FETs' Sources doesn't make sense yet may be wrong to assume dual parallel FETs are discharge and the lone...
  9. C

    connections for? EcityP Smart S5-13 BMS

    I ordered an ECityPower "smart" BMS from BMS Battery on Aug. 17, 2010, with my custom voltages, currents, etc. It shipped DHL on Aug. 19. It arrived in Ontario, Canada on Aug. 23. The BMS and a few extras were appropriately and safely packaged. There were no hidden fees. The BMS arrived with...
  10. C

    Headway pack: put single temp probe where?

    thanks, In an aside, I ordered a "smart" BMS from BMS on Aug. 17, 2010, with my custom voltages, currents, etc. It shipped DHL on Aug. 19. It arrived in Ontario, Canada on Aug. 23. The BMS and a few extras were appropriately and safely packaged. There were no hidden fees. The BMS arrived...
  11. C

    Headway pack: put single temp probe where?

    Thanks all, Kapton to a center cell it is. Hadn't thought ahead enough to strain relief any of the wires. Good tip. Thanks! Adrian E-bike. The controller is rated to 800W @36VDC and it's driving a 450W motor chain-drive with a max draw of 16A, which should be a walk in the part for the...
  12. C

    Headway pack: put single temp probe where?

    Sorry, but another newbie question here. I've just assembled my 12S Headway 38120 pack. I've got a HKVT-Monitor/9744 Hobby King Voltage & Temperature Monitor/Alarm. Where exactly should I put the temperature probe? in the air in the middle of the pack for Pack Ambient? against the side of a...
  13. C

    LiFePO4: what makes a Smart charger Smart?

    I'm not seeing any technical detail about the charger. Only that it's nominally 36V. No info on current or charging voltages. Likely meant for SLA.
  14. C

    LiFePO4: what makes a Smart charger Smart?

    Thanks for all the replies. Learning lots; see there's more to go. Forgive me, as before this I haven't looked at charging batteries since nicads came out, but don't we need to supply a voltage higher than the cell voltage in order for it to charge? I'm confused about what is happening during...
  15. C

    LiFePO4: what makes a Smart charger Smart?

    Or, a single Headway cell, fully charged at 3.65V, once removed from the charger will measure what voltage across the cell?
  16. C

    LiFePO4: what makes a Smart charger Smart?

    thanks sounds like the behavior of the Soneil SLA chargers So, for a LiFePO4 ~36V pack (38.40V) charged up to 43.8V, then until current tapers down to 20%-30% CC, when the charging is complete and the battery pack is disconnected from the charger, what is the measured voltage across the...
  17. C

    LiFePO4: what makes a Smart charger Smart?

    I'm building my own pack of Headway 38120 cells. 12S for 38.4Vn 10ah with 43.8Vmax. I've ordered a BMS (43.8Vmax, 24.0 Vmin, 20A Cmax, 30A continuous max). I don't need the higher currents right now, but got them to allow for future use of dumping regen back into the pack and situations where I...
  18. C

    LiFePO4: what makes a Smart charger Smart?

    So what does a "Smart" LiFePO4 charger do? How would one know the charger they're buying is actually "Smart"? How much risk to charge the string with a Smart charger but without a BMS and then manually balance? Or would it be better to: partially charge then manually balance, partially...
  19. C

    10A (or variable I) charger for 12S Headway 38120?

    Anyone know of a source for 10A smart charger for a 38.4VDC 12S pack of Headway 38120 cells? Cut-off voltage for the 12S would be 43.8VDC, unless I've got that wrong. Any chance of a selectable current charger? One where you could select 10A when you need it charged "right now", or 5A or 2A...
Back
Top