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dc/dc converter

  1. Main fuse blown - but how?

    Technical Discussion
    Hi all, I took the prelude for a little drive on Saturday, but first some back story. The Prelude conversion has a ~18 kWh battery of 70 Ah capacity and 270 V nominal voltage. It will soon be 355 V nominal, but more on that another time. I have a master contactor and a master precharge relay...
  2. Switching HV accessories in conversions?

    All EV Conversions and Builds
    Precharge of the capacitors on a drive inverter is well understood - and most inverters manage this themselves. But I'm curious about the other accessories that run on ~380 volts DC. DC/DC converters have a certain amount of capacitance that would potentially weld a contactor. Likewise, high...
  3. max DC/DC converter charge amperage

    Batteries and Charging
    I have a problem/question re: the DC/DC converter and accessory battery setup. See config and load info below. Here is the problem - Turn car on *with headlights* Fuse between DC/DC converter and accessory battery blows Accessory battery rapidly loses voltage - within 20min Lights die, along...
  4. 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...
  5. For Sale : Vicor MegaPAC

    Classifieds
    Vicor MegaPAC DC/DC power supply. $100 obo this is a 115/230 auto-ranging input and has 8 modules. 6x M5.2v / 38.5A 2x M5v / 40Av2 These modules can be trimmed up as much as 10% or down as much as 50%. To set up for 13.5v you just need to trim them down to 4.5v and then put three in...
  6. Chrysler GEM DC-DC Converter 72v Heavy Duty

    eBay EV-Related Auctions
    Sure Power Industries DC/DC Converter. OEM Updated Heavy Duty Converter Model number : 71030i Input: 72vdc-96vdc nominal output: 13.5vdc 30A Fuse Rating: 125vdc/15A 12 pin connector This part powers the low voltage accessories of a Chrysler GEM NEV Car (lights, horn, wiper, etc) Can be used as...
  7. how do you charge lithium betteries

    Batteries and Charging
    i was hoping to find out a little more about how the charger actually charges the batteries. is it as simple as setting the max voltage and then pumping that many volts into the battery untill the battery reaches that level. for example if i have a lithium battery that i want to charge to 4v...
  8. DC/DC converter installation confusion

    Technical Discussion
    Hi all. Well after my last post I was definitely convinced that the dc/dc converter along with small 12v aux battery was the right way to go. One question though: I don't know how an alternator is wired, so I'm wondering how the dc/dc wiring works? Should it just be wired right to the posts of...
  9. Aux Battery Needed?

    Technical Discussion
    I was wondering, because I've had a hard time finding info, if the aux 12V battery is really necessary? Would an EV work with just the DC/DC converter alone, or does that cause issues with the contactor/precharge business? Also, it seems the precharge resistor is something I overlooked in my...
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