Search found 14270 matches

by fechter
Feb 26 2020 1:23pm
Forum: E-Vehicles General Discussion
Topic: C Cab Hot Rod Power Advice
Replies: 249
Views: 8010

Re: C Cab Hot Rod Power Advice

Found this one. And it's 48 pounds lighter. Not sure how long 90Ah would be in reality. It says it's 3 series cells. 12.6v fully charged (or maybe a little less). If you tried to charge it with the vehicle, it would get dangerously over charged. For a 12 lead-acid replacement, 4 series LiFePO4 cell...
by fechter
Feb 26 2020 8:44am
Forum: E-Vehicles General Discussion
Topic: C Cab Hot Rod Power Advice
Replies: 249
Views: 8010

Re: C Cab Hot Rod Power Advice

Lets look at it another way. Only as a back up to the existing batteries. Disconnecting the RV batteries, and using my battery pack instead. Would I still need to use the 48v to 12v converter? Yes, that could work. I'll bet the output of the converter is really more like 13.8v (mine was). There may...
by fechter
Feb 26 2020 12:14am
Forum: E-Vehicles General Discussion
Topic: C Cab Hot Rod Power Advice
Replies: 249
Views: 8010

Re: C Cab Hot Rod Power Advice

You can't charge a lead-acid car battery using the 12v dc-dc converter. It doesn't have current limiting made for that so could overheat and self-destruct. They do make similar units that could be used to charge a battery. Something labeled CC-CV.
by fechter
Feb 25 2020 12:21pm
Forum: E-Vehicles General Discussion
Topic: C Cab Hot Rod Power Advice
Replies: 249
Views: 8010

Re: C Cab Hot Rod Power Advice

Your 12v converter looks just like one I have. So far no problems. Yes, you could use the big battery and inverter just like a generator (without the noise and smoke). I have a bigger inverter that can power a microwave oven or just about anything else. Now you can bring the big screen TV and laptop...
by fechter
Feb 25 2020 9:09am
Forum: E-Vehicles General Discussion
Topic: C Cab Hot Rod Power Advice
Replies: 249
Views: 8010

Re: C Cab Hot Rod Power Advice

25A is probably overkill, but they are very efficient so the only real drawback will be size/cost. With LED headlights, the light loads should be way less than the rating. Nice to have some extra capacity for future accessories. This one has a "key switch" line so the main wires can stay connected, ...
by fechter
Feb 25 2020 12:26am
Forum: E-Vehicles General Discussion
Topic: C Cab Hot Rod Power Advice
Replies: 249
Views: 8010

Re: C Cab Hot Rod Power Advice

Just_Ed wrote:
Feb 24 2020 11:39pm

I'm ready to buy, if it seems the right unit.....what say you?

https://www.amazon.com/dp/B07S8H5JMR/re ... UTF8&psc=1
Yes, good.
by fechter
Feb 24 2020 9:18pm
Forum: E-Vehicles General Discussion
Topic: C Cab Hot Rod Power Advice
Replies: 249
Views: 8010

Re: C Cab Hot Rod Power Advice

Excellent. That should work great.

The motors will tend to go the same speed but if there was a problem where they were drastically different you would notice a pull in the steering.

You can try to check the speeds with the wheels off the ground when you get them going.
by fechter
Feb 24 2020 9:35am
Forum: E-Vehicles General Discussion
Topic: C Cab Hot Rod Power Advice
Replies: 249
Views: 8010

Re: C Cab Hot Rod Power Advice

The latest configuration picture looks not bad. The resistance between the two controllers should be low enough to play nice. Just keep in mind that if those terminals come loose, you will likely fry one of the controllers. The throttle uses 3 wires. +5v, ground and signal. To combine the controller...
by fechter
Feb 24 2020 9:17am
Forum: E-Bike Technical
Topic: "modern" display for cycle analyst
Replies: 10
Views: 411

Re: "modern" display for cycle analyst

Here are a couple of screen shots of the PV dash. PV dash 1.jpg PV dash 2.png My personal preference would be to have the speed number very large since that's what I want to see most often. Power consumption and battery SOC are next most important and work well with a bar graph or graphical dial. Tr...
by fechter
Feb 24 2020 9:06am
Forum: E-Bike General Discussion
Topic: Hunting/mountain E-Bikes
Replies: 23
Views: 621

Re: Hunting/mountain E-Bikes

I have a fat bike with a G510 Bafang drive. Img_1480B.jpg The G510 has some advantages and some disadvantages. Overall, I like riding it as the torque sensing PAS works much better than the PAS on a BBSHD. I put the smallest chain ring I could fit on there (38t) and I think the lowest rear cog is 36...
by fechter
Feb 23 2020 11:08pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 966
Views: 76512

Re: APL's DIY axial-flux motor

Looks like I might able to leave the spacer bonded to the back iron, as it doesn't really get in anythings way. I probably should have made the spokes another 1mm thinner, 4mm looks just a little bit to wide. That might be a good idea. As long as it doesn't rub on anything it won't hurt to keep it ...
by fechter
Feb 23 2020 8:02pm
Forum: E-Bike General Discussion
Topic: Recommend bike to bike communication method
Replies: 9
Views: 243

Re: Recommend bike to bike communication method

I think there is a walkie-talkie app for phones that uses WiFi. I haven’t tried it but might be something to look into.
by fechter
Feb 23 2020 7:43pm
Forum: E-Bike Technical
Topic: "modern" display for cycle analyst
Replies: 10
Views: 411

Re: "modern" display for cycle analyst

This sounds like a job for Justin. He needs to come out with a CA v4 with a nicer graphical display.

I like the ones PowerVelocity does on their phone app.
by fechter
Feb 23 2020 7:21pm
Forum: E-Bike Technical
Topic: HeatSink that works well for smaller hub motors....
Replies: 24
Views: 400

Re: HeatSink that works well for smaller hub motors....

Any additional surface area will improve cooling but the thermal resistance between the windings and the disk will make the improvement pretty small. If it was a direct drive motor with ferrofluid it would make much more improvement.

You want the heat path to be as short and fat as possible.
by fechter
Feb 23 2020 7:09pm
Forum: Battery Technology
Topic: 20s bms on 18s battery for charging only
Replies: 2
Views: 107

Re: 20s bms on 18s battery for charging only

Post a picture of the BMS. Many of them are easy to use with fewer cells. Some are not.

In general you wire starting at the B- end and tie the unused wires to the top cell wire.
by fechter
Feb 23 2020 7:05pm
Forum: E-Bike Non-hub Motor Drives
Topic: Revonte ONE drive system
Replies: 2
Views: 159

Re: Revonte ONE drive system

That’s pretty cool. A CVT for an ebike. I wonder how the efficiency is? My guess is pretty good since there don’t seem to be many places for losses.
by fechter
Feb 23 2020 6:56pm
Forum: Motor Technology
Topic: Neumotor 8057/75 middrive project, belt drive, adding halls, 10kW+
Replies: 154
Views: 27877

Re: Neumotor 8057/75 middrive project, belt drive, adding halls, 10kW+

If the hall sensor is located exactly at the middle of the magnet you could have no flux in the direction of the sensor axis (fail). If the sensor axis is off a little from the middle of the magnet, it should work fine. If you powered a sensor and watched the output while trying different positions ...
by fechter
Feb 23 2020 6:05pm
Forum: E-Bike Non-hub Motor Drives
Topic: Bafang Max Drive - configuring
Replies: 43
Views: 21377

Re: Bafang Max Drive - configuring

HI Guys I have ones of these drives second hand and it has the wrench symbol up. not sure where to start fault finding. controller or motor? Can anyone point me in the right direction? it seems the speed sensor is not working also. The wrench symbol might just be the service reminder. If the speed ...
by fechter
Feb 23 2020 5:43pm
Forum: E-Vehicles General Discussion
Topic: C Cab Hot Rod Power Advice
Replies: 249
Views: 8010

Re: C Cab Hot Rod Power Advice

It would be best if the main negative wires were connected directly to each other on the terminal block. This also goes to the battery. If the negative battery connection between the two controllers gets loose or has too much resistance many bad things can happen. I would flip the controllers around...
by fechter
Feb 22 2020 10:45pm
Forum: E-Bike Non-hub Motor Drives
Topic: Sur-Ron - New Mid drive Bike
Replies: 4531
Views: 446424

Re: Sur-Ron - New Mid drive Bike

michi.777,

You're going to have to move your posts to a new topic in the Items for Sale - New section of the forum. Advertisements in discussion threads are not allowed (considered spam). Parts look nice though.
by fechter
Feb 21 2020 3:08pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 966
Views: 76512

Re: APL's DIY axial-flux motor

OK, one down,.. but now your alternator picture is bothering me. How is it that it has trapezoid rotors, but straight stators? (at least, appears to.) You are correct. I think they make them like that mostly for cost reasons. It is not optimal from an efficiency standpoint. The tapered poles on the...
by fechter
Feb 21 2020 3:02pm
Forum: General Discussion
Topic: Discussions aren't the same quality without Chalo
Replies: 139
Views: 6607

Re: Discussions aren't the same quality without Chalo

Interestingly, LockH was banned by the same person that banned Chalo and for similar reasons. Don't piss off a moderator. I found LockH's posts pretty entertaining myself. But this is all in the past and my guess is if either of them wanted to come back, they would have already come back with a diff...
by fechter
Feb 21 2020 2:38pm
Forum: General Discussion
Topic: la Nina rears her ugly head
Replies: 1626
Views: 110746

Re: la Nina rears her ugly head

Normally this is the rainiest time of year but I've only had about 1.5" since January. I had to turn my irrigation system back on to keep the plants alive. I washed all the mud off my bikes but even that didn't bring any rain. The trails are totally dried out now, so at least riding is nice. Temps i...
by fechter
Feb 21 2020 1:38pm
Forum: E-Vehicles General Discussion
Topic: C Cab Hot Rod Power Advice
Replies: 249
Views: 8010

Re: C Cab Hot Rod Power Advice

One thing that will be important is to have a very low resistance connection between the two controller B- connections. Use heavy wire and keep it as short as practical. This is because you are going to share the throttle between the two and any voltage difference can affect the throttle signal. You...
by fechter
Feb 20 2020 5:03pm
Forum: Electric Watercraft
Topic: Electric 22 feet speedboat from 1957
Replies: 21
Views: 558

Re: Electric 22 feet speedboat from 1957

There's a topic somewhere on the forum about used EV batteries and their specs. I would definitely be looking at those vs. a gigantic 18650 build. Leaf modules are very easy to work with and readily available. Chevy volt cells are probably the next most available. Build what you need using the modul...