Power in Flux

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Type: Posts; User: frodus

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    It should be a kick in the pants! I'm aiming for...

    It should be a kick in the pants! I'm aiming for 30-35kW peaks with voltage sag, still it's a bit more HP (and torque) than some of the engines these guys run.

    I want to raise the ride height a...
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    We have Portland International Raceway and they...

    We have Portland International Raceway and they do some track days. There's also a couple kart tracks where I can grab some track time on certain days. I may not do racing competitivbely, but I'd...
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    Pics of the batteries:...

    Pics of the batteries:
    http://excessive.engineering/wp-content/uploads/2018/06/IMG_2531-e1529434316433.jpg

    http://excessive.engineering/wp-content/uploads/2018/06/IMG_2532-e1529434361198.jpg
    ...
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    Electric Kart build

    Yeah, Yeah, Yeah, I know, it's not a Motorcycle. Get over it, haha.

    So, my business has been selling quite a few of the Motenergy and Sevcon packages, and I've come to need my own vehicle as a...
  5. Thread: Series Parallel

    by frodus
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    Stevo, The Sevcon can be set to a pack voltage...

    Stevo,
    The Sevcon can be set to a pack voltage threshold, so it reduces power below a certain voltage, and reduces to zero below another voltage. I can help set that if you have the programming...
  6. Thread: Series Parallel

    by frodus
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    650

    I don't really recommend bottom balancing. I have...

    I don't really recommend bottom balancing. I have always done a top balance.

    My reasoning: There's more energy in a cell when it's fully charged, than at the bottom. So if you bottom balance, how...
  7. Thread: Series Parallel

    by frodus
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    Now you're getting it! Just remember, there...

    Now you're getting it!

    Just remember, there are 2s2p in those leaf cells. So the 3 terminals, are the cell taps. One is the most positive, one is the most negative, and the center is the middle...
  8. 120V is the absolute max on this controller. It...

    120V is the absolute max on this controller. It can withstand higher, but it will not function above 120V. i.e. it won't work.

    Reduce voltage to below 120V and you should be OK.
  9. Is this the one you bought from me? The ones I...

    Is this the one you bought from me? The ones I sell go to 120V. Above that, they go into shutdown and do not turn on.
  10. They've got a good motor, that is power dense,...

    They've got a good motor, that is power dense, that is going to be hard to beat. The ME1507 is "close", but may not match the power levels or sustained power of the 75-7 motor.

    Right now, the...
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    Cool, interested to see what happens. I found...

    Cool, interested to see what happens.

    I found this guy, done some amazing shit with the Sevcon, but not sure if it's a shared project....
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    Any update on how this is going?

    Any update on how this is going?
  13. Thread: Series Parallel

    by frodus
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    Your latest drawing (and one before) won't work....

    Your latest drawing (and one before) won't work. NEVER CONNECT in series + to +, or - to -. You show all of your batteries in series. There's no paralleling shown on any of your drawings. Please DO...
  14. Thread: Series Parallel

    by frodus
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    650

    What is it you're trying to accomplish? Just get...

    What is it you're trying to accomplish? Just get a charger that suits the entire pack. Also, don't have different parallel groups of cells (different Ah cell groups) in series. That will cause...
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    Shunts are very closely tuned/ground to have a...

    Shunts are very closely tuned/ground to have a very specific resistance. I doubt you'd be able to get a consistent resistance across a standard fuse. Just use a shunt.
  16. Thread: Series Parallel

    by frodus
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    650

    Can you draw out the 2 different wiring diagrams...

    Can you draw out the 2 different wiring diagrams of the battery you're speaking about?
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    That seems pretty quick even at partial throttle!

    That seems pretty quick even at partial throttle!
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    Maybe get something that is more of a mechanical...

    Maybe get something that is more of a mechanical thumb throttle, and use a cable and tried-and-true Potbox PB-6 or PB-8 (or similar).
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    This has been fun to work on with you, can't wait...

    This has been fun to work on with you, can't wait to see it on the Track!

    Post more pictures dude!
  20. Now available: sprockets, Clearview display and Domino throttle

    In addition to selling the Sevcon Gen 4 Size 6 controllers, ME1507/ME1616/ME1304 motors and other accessories, I'm happy to announce that we're selling 11T hardened steel sprockets for 7/8" and...
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    I'd do research. There are varied opinions on ZEV...

    I'd do research. There are varied opinions on ZEV and the owner.
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    Sweet. Those new style batts look nice! ...

    Sweet. Those new style batts look nice!

    Shipping the controller and harness tomorrow! All packed and ready to go. We'll definitely want to tweak some things to get you max power out of this motor.
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    You're welcome! Glad it's now working bud!

    You're welcome! Glad it's now working bud!
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    Also only use lev200 with the sevcon.

    Also only use lev200 with the sevcon.
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    Read my post. The controllers are set to torque...

    Read my post. The controllers are set to torque mode when I program them. With no load it will runaway because it requires very little torque. It's fine. Put a load on it or mount it and ride it it...
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