mwkeefer wrote:spike - hey man, that's my real world nick = ) If you could be a bit more specific about your needs I am sure that myself and the other (more elite) lipo people would be glad to assist. Based just upon what you have put in the post and assuming you mean nominal pack v as opposed to off charger v: To get 10AH you will need to double the packs from HobbyCity (5AH ea) and for the voltage at nominal just use (3.7 / 60 = 16.21 lipo cells). I think you would be ok just using a 2P16S configuration which (and I am looking to methods or liveforphysics now to confirm) would best be fit ordering 4 6S packs and 4 2S packs from hobby king.
That will give you a nominal voltage of 59.2v but off the charger you would see 67.2 which should work fine.
If this is not what you are looking for in nominal V let me know.
In regards to chargers I will let methods or another chime in as I use 2x fairly expensive (160+ USD) chargers/balancers and a custom charge harness currently (uses relays to switch the packs into charge mode as 2x or 4x 6S packs, once power is applied to the charge port - if failure or removal of charge power then board defaults to discharge mode (it's ugly and bulky but it works and I already have my netbook in my luggage bag with all these other items. Not sure this is a way for anyone to go, I like the idea of SLA chargers (or powersupply chargers) for in field use but... I didn't know enough at the time to trust myself with those.
mwkeefer wrote:PPS: methods - Have you ever had a lipo puff or blow while in use on bike? If so, bad lipo? Electric failure cascade, swollen packs? Did you get hurt?
If you would be so kind as to post your current setup: motor type, drive type, speed controller type, desired top speed, average crusing speed, manor in which you intend to use (power only, throttle only or hybrid) and finally the range you would like to acheive. Be as specific as possible about your motor and ESC, if you have ratings such as kV (RPM of motor per 1V input) that would be helpful. What model / type of ESC are you using or if your not sure, where did it come from. Another item is budget, what are you planning to spend for the batts, chargers and power supplies. And yes cell level discharge LVC (low voltage cutout) is important because if you develop a bad lipo cell it will prevent over discharging a single cell thereby causing potential damage. That would save your pack (if you have the LVC wired to a power cutout - ebrake connector or such). Post what details of your intended setup you can and I will work out recommendations tonight. -Mike
Jeremy Harris wrote: but if I have quite a few cells paralleled up via the balance connectors I'm hoping that things should even out, allowing the standard wires to be used.
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