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  1. Putting together two lithium (18650) packs in series

    Batteries and Charging
    Hello all, I've got a bit of a question. I'm looking to upgrade my battery pack to a home-made 18650 pack, but I know in the future I'm going to be doubling my voltage and upgrading the motor, controller etc. I can't afford to do this now, but I'm wondering if I can build half my pack now to...
  2. Battery Packs at Series and Parallel

    Technical Discussion
    Hi, I have four (4) 37v 10,4Ah lip Battery packs with built in bms. I would like to build a 74v 20,8 Ah, so I have to wire up two at series the other two at series and then this two new packs at parallel between them, right? But I´m not sure a few things, what about the built in bms, would...
  3. Series connected inputs on isolated DC/DC converters...

    Technical Discussion
    Hi All, For those who don't know, I'm working on an electric race bike destined to compete with Ripperton's machine this June. All of the 12 V auxiliary stuff is to be powered from a 12 V battery, and this battery is to be recharged between races. It will work for now, but later on I was...
  4. Multiple chargers?

    Technical Discussion
    Hey I have seen on the internet guys saying they are using multiple chargers (so each battey has its own charger) on motorcycles (6 ) and in cars (28). My questions is how exactly is this wired? It did not seem they were breaking the series. If I have (4 )12 volt batteries in series and I...
  5. charge in Parallel / Discharge in Series

    Batteries and Charging
    Appologies if this has already been answered somewhere else, if it has please link and close the thread. Say I need a pack Voltage between 400-480V If using 3.2cells (125-150 x 10aH) Would I be able to wire it up using some kind of breaker switch or something where I have multiple smaller...
  6. 2 X 2.4 kW at 24v burnt at 48V

    Electric Motors
    I'm offered to use two 2.4kW DC motors at 24V - 2400rpm. I was told that I can get about 5kw from each at 48V (3500rpm) with one Curtis Controller 1205P 36-48 48v 150A (for 1h), 250 (5 mins). ($250 for the two motors and $300-350 for the controller - is it a good price?) Would this work and is...
  7. Cheap charging options

    Batteries and Charging
    I am planning my first EV project using a '78 Honda CB400T. It will be 48V with a Mars/Etec style motor. I'm hoping for a 12-15 mile range and a top speed of 50 mph for my commute. My question is about charging. I know using four separate cheaper 12V chargers can work well to keep everything...
  8. Expert controller advice needed

    Electric Bikes
    Hello! This is my first project dealing with any sort of electric motors. I have been teaching myself as I go but I ran into a road block I want to use a CURTIS SepEX TRACTION CONTROLLER DC MOTOR CONTROL 24- 36 Volts with a 4 HP 24 Volt DC Reversible Electric Motor The problem (I am told)...
  9. Controller Question

    Controllers
    Hello, ive searched for the answer to my question for a while and am unable to find it, thats why i joined DIY electric car. My question is can you hook up a controller in series or parallel with a twin controller (ie the exact same controller) to increase either the voltage or the amps the...
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