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    36v vs 48v batteries

    To get the energy the battery can hold, multiply the charge (number of amp hours) times the voltage (this gives watt hours). A 36V battery will store 25% less energy than the same Ah 48V battery, because it has 25% less voltage. So, the 36V battery will theoretically have 25% less range, or...
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    BLDC Motor Integration w/ Motor Controllers

    Is it possible your new controller is not three phase? Will it work sensorless? Have you tried swapping the phase wires around in different combos? More info on your Anaheim controller would be helpful.
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    Charging ebike without chargers?

    If your bike has regen this would be easy. Just have to lift the rear wheel off the ground. You would need to watch your voltage though so you don't overcharge. Or the whole fire dept will get some exercise too.
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    Lipos a good option for high performance small pack?

    Well, I've ordered LG HG2, which are rated 3Ah, 6.6C (20A). I'm running 15S4P (60 cells), which is 12Ah, 80A. I've only got a 1000W motor, this should be more than enough (low 3V*15S*80A=3.6kW). 2.9kg for the cells (granted, packing will add a tiny bit). I might upgrade to 15S6P for 18Ah (50%...
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    Lipos a good option for high performance small pack?

    Another downside I dunno if anyone has mentioned is weight. These super-high discharge packs look significantly heavier per Ah than good high capacity 18650. They trade off electrolyte for more anode and cathode, which makes them heavier and more volatile per Ah. Good for short RC plane flights...
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    Redefining the "SLA" ebike

    Nice to see another V2100! I picked one up on craigslist several weeks ago for my first (budget) build. Still waiting on my motor and batteries, but I swapped out the front brake caliper and rotor today (stock one was garbage and already broken), what a world of difference. I've never worked on...
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    Without BMS

    Seems kind of silly to not have a circuit monitoring each parallel group of cells, if you want to prolong the life of your pack. You really, really don't want any individual groups going above 4.2V, under 2.5V, or significantly over temperature (120F/50C). Judging the voltage of the whole pack...
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    Boston's new nightmare inducing robot

    The US military/DARPA has been one of the major funding sources for Boston Dynamics. IIRC their original dog thing is/was available to special forces as an alternative to pack mules, but was often not used because they were powered by loud gas engines which would compromise stealth in...
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    Custom genesis v2100 torque arm

    How's this working for you? I've got the same frame, going to attempt a similar one.
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    induction charging and balancing?

    The problem with these systems is they are somewhat inefficient. Making it wireless causes some power loss. If you can plug it in, that's generally the way to go, from an efficiency standpoint.
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