I still love the idea of a pair of big EDF’s to “use up” regen current, mounted exhaust forward on the front of the board, screaming away as you go down a hill.
LOL…mounted properly they would even blow leaves out of your way.
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How would you divert the regen current? With something like what’s linked above?
Yes, checking that voltage/current levels are all okay though. For example, you might need a controller for each EDF. Though I guess it could be as simple as activating a solid-state switch under my own (remote) control whenever I went downhill with a pack near full charge.
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The Maytech remote v2 reciever has a relay that can be activated by the remote, that sounds ideal imo
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You could just use the thumbwheel on the Mini Remote
I have two massive planner resistors with aluminum heatsinks, but even still I cannot do anywhere near 10A at 12s.
I had to go way higher resistance to keep the watts down.
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What is a good budget camera for recording a crash (legal shenanigans for when I get bodied by a bus and I need proof so the university pays for everything)? Maybe a Hero 6 or 7?
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iirc starting from hero7 there is hypersmooth, which might be better?
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Google refuses to tell me what an EDF is, context clues are leading towards a big fan or air compressor?
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Electric ducted fan
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Ahhh thank you, that does look like a laugh
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The sound they make is incredible, similar to a jet engine. Check out a couple YouTube videos to hear them if interested.
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Depends on how cheap you want to go. Even one of those generic $30 4k action cams will be able to resolve a bus, and you won’t be taking them underwater so WR doesn’t really matter a whole lot. If you want more features like vibration reduction or better clarity you can get actual action cameras like a GoPro or DJI, but cost also jumps to $150-200.
What resistance? Do you have numbers of what you tried and what you’re going to try? Did it get too hot? What specifically got too hot? How hot did it get?
I have never tested it.
I bought two 5 ohm resistors. They are each rated for 100W and 5 seconds of 500W.
https://www.mouser.com/ProductDetail/ARCOL-Ohmite/LPR100-5R-J
My concern is I don’t know the inductance of the resistor, and the spintend manual says it’s untested with high inductance loads.
Will probably get around to testing it at some point this winter. Will be testing on a 4.12 first at 10s. Then if that goes well maybe it’ll go on a board at 12s. Although now I’m wanting to go 16s so I might test that in the spring.
Amy from spintend said these have been used by a customer before Fch800 Planar Thick Film Non Inductive Power Resistor For Control Devices - Buy Power Resistor,Non Inductive Power Resistor,Thick Film Non Inductive Power Resistor Product on Alibaba.com
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That doesn’t appear to be a high inductance load, should be okay.
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My concern being the company that makes the ones I bought makes non inductive resistors for more money. And I don’t know enough about resistors to know how big a difference that bump in price makes.
Be aware that the ratings are only valid if the resistor is mounted on a large enough heat sink to keep it below its max rated temp. This may not be an issue with the way it will be used here but that thing can get hot.
I hope your Winter testing goes well!
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My concern is we don’t know what Spintend means by “high inductance”.
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Rereading the manual it just says “Inductance load, such as DC motor, metal coil,
are not fully tested yet, carefully to use them.” “High inductance” was my paraphrasing.
https://drive.google.com/file/d/1mvKkG7ZXcDim9OeqHYWw-6Qc6JafIou4/view
Do you know what “Implement an active freewheeling, to drive
inductance load” means? It’s under next steps in the manual.
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