Search found 2303 matches

by e-beach
Mar 19 2019 10:46am
Forum: E-Vehicles General Discussion
Topic: The economics of scooter rentals.
Replies: 72
Views: 2996

Re: The economics of scooter rentals.

Poor guy, goes for a scooter ride and gets killed. :( Man on electric scooter killed in hit-and-run crash in Santa Monica By Jaclyn Cosgrove Mar 18, 2019 | 7:55 PM The Santa Monica Police Department asked for the public’s help Monday in finding the driver who fled after striking a 41-year-old man wh...
by e-beach
Mar 18 2019 8:57pm
Forum: E-Bike Technical
Topic: Built my mom an ebike and it's destroying batteries
Replies: 14
Views: 520

Re: Built my mom an ebike and it's destroying batteries

Glad you got it going!

Edit: What are the specs on the new controller?

:D :bolt:
by e-beach
Mar 17 2019 10:55pm
Forum: General Discussion
Topic: Legends dropping like flies
Replies: 227
Views: 26789

Re: Legends dropping like flies

Wow, RIP Dick Dale. It is very rare for a musician to develop a completely distinctive style on an instrument. Dick Dale did that with his guitar. I saw him play 10 times. He was not so popular in the early 1980's so it was easy to see him live. Usually somewhere around the south bay or around New P...
by e-beach
Mar 17 2019 10:30pm
Forum: Battery Technology
Topic: First battery built, confusion re capacity, charge in.
Replies: 5
Views: 85

Re: First battery built, confusion re capacity, charge in.

Sorry I was ambiguous. Each cell is 2600mAh so yes 10s4p = 10400mAh. I confused the issue because the each drone battery was 3s2p which I thought was unusual. Let me rephrase ... is a battery pack likely to be 10-12% under-specified in capacity? Seems like a lot. Some battery manufactures and selle...
by e-beach
Mar 17 2019 5:41pm
Forum: Battery Technology
Topic: First battery built, confusion re capacity, charge in.
Replies: 5
Views: 85

Re: First battery built, confusion re capacity, charge in.

Hi all, Thanks you all for the great info here. I built my first LiPo battery from new drone batteries (Xiro Xplorer 11.1V 5200mAh) making a 10S4P battery pack. (the drone batteries were 3S2P and a bargain at $15 each) According to my calculations this is a 37V x 10.4Ah = 384Wh battery. When I char...
by e-beach
Mar 17 2019 3:52pm
Forum: E-Bike Technical
Topic: Hall sensor problems, i guess
Replies: 10
Views: 159

Re: Hall sensor problems, i guess

Ok, tell my you are not testing your hall sensors with the connector unplugged. You have the connector plugged in and you are metering through the back of the connector.... Right?

:D :bolt:
by e-beach
Mar 16 2019 1:49pm
Forum: E-Bike Technical
Topic: Hall sensor problems, i guess
Replies: 10
Views: 159

Re: Hall sensor problems, i guess

Sounds like a process of elimination which it seems like you already started. Don't get so far away from the settings on you controller that you can't get back to stock settings. Since you are thinking hall sensors, they should read 0v or 5v. (providing your controller is sending 5v to the halls.) T...
by e-beach
Mar 15 2019 9:42pm
Forum: E-Vehicles General Discussion
Topic: The economics of scooter rentals.
Replies: 72
Views: 2996

Re: The economics of scooter rentals.

Looks like they might track you home. :shock: L.A. wants to track your scooter trips. Is it a dangerous precedent? By Laura J. Nelson Mar 15, 2019 | 5:40 PM The city says that tracking each scooter trip in Los Angeles will help officials determine which companies are not following new operating rule...
by e-beach
Mar 15 2019 8:09pm
Forum: E-Bike Technical
Topic: 2018 Torque Arm Tests, Splined Interface Design and Tabbed Washers
Replies: 155
Views: 10096

Re: 2018 Torque Arm Tests, Splined Interface Design and Tabbed Washers

Well,....It may be that the screws just aren't tight enough. Consider the automobile lug nut. Crank them and they stay.

:D :bolt:
by e-beach
Mar 15 2019 12:47pm
Forum: E-Bike Technical
Topic: 2018 Torque Arm Tests, Splined Interface Design and Tabbed Washers
Replies: 155
Views: 10096

Re: 2018 Torque Arm Tests, Splined Interface Design and Tabbed Washers

.... there just isn't the space for a normal socket head or the meat to do a recessed socket head (arm piece is just 1/8" thick).... What I am seeing is two exposed screws on the bottom of the arm that could be changed to hex bolts. If the arm had it's shape changed (made bigger) so that a third an...
by e-beach
Mar 09 2019 10:18pm
Forum: Battery Technology
Topic: New weldless battery system crowdfunfing project
Replies: 43
Views: 1166

Re: New weldless battery system crowdfunfing project

If you are worried about the springs vibrating loose, reduce them by half. Cut some of the plastic sleeve off the negative end of the battery and build a clamping / grounding system (easily 3d printed or machine milled) that clamps the end of the cell in metal so that the cell doesn't bounce around ...
by e-beach
Mar 07 2019 7:57pm
Forum: Stand-up E-scooters and E-skateboards
Topic: 70% throttle deadband
Replies: 8
Views: 203

Re: 70% throttle deadband

Red and blue wires show 40v. White is about 3.55v, green at 4.2. Got the cover off. Everything looks good. Tried cajoling the hall/magnet etc in various combos - no difference of any kind. Doesn’t kick in until past half the magnet sweep. all other led screen functions, menues etc etc appear to wor...
by e-beach
Mar 06 2019 8:36pm
Forum: Stand-up E-scooters and E-skateboards
Topic: 70% throttle deadband
Replies: 8
Views: 203

Re: 70% throttle deadband

Testing the throttle could help you discern if the throttle is faulty. Be careful not to over volt it. When I test my throttles I generely use a depleted 9v battery that is under 6v. If you can find one that is 5v even better. Connect the positive to the red wire. The negative to the black (or dark ...
by e-beach
Mar 06 2019 12:03am
Forum: Stand-up E-scooters and E-skateboards
Topic: 70% throttle deadband
Replies: 8
Views: 203

Re: 70% throttle deadband

The first thing I would do is check all the connectors to make sure that they are all properly connected. No connectors backed away from the pins etc. If that is not it, then I would check the throttle for consistency. If the throttle is not working right, it might have a bad hall sensor. After that...
by e-beach
Mar 04 2019 1:54pm
Forum: Battery Technology
Topic: Greenworks 60v rebuild
Replies: 13
Views: 338

Re: Greenworks 60v rebuild

IMO if you had a good experience with a re-builder then go with him if it is cheaper then new. If it is about the same price, go with the one with the best guarantee.

:D :bolt:
by e-beach
Mar 02 2019 12:24am
Forum: General Discussion
Topic: (NTSB) teams to investigate a fatal crash in Florida involving a Tesla car
Replies: 0
Views: 118

(NTSB) teams to investigate a fatal crash in Florida involving a Tesla car

WASHINGTON (Reuters) - The National Highway Traffic Safety Administration (NHTSA) and the National Transportation Safety Board (NTSB) said they are sending teams to investigate a fatal crash in Florida on Friday involving a Tesla Inc car and a semi-trailer. The two agencies are investigating several...
by e-beach
Mar 01 2019 9:13pm
Forum: General Discussion
Topic: Myths about Electricity
Replies: 16
Views: 573

Re: Myths about Electricity

:shock:

by e-beach
Mar 01 2019 7:59pm
Forum: Battery Technology
Topic: Greenworks 60v rebuild
Replies: 13
Views: 338

Re: Greenworks 60v rebuild

If your battery pack has 30 cells then it is probably 15s 2p (2 parallel blocks of 15 cells in series.) 4.2v x 15 = 63v The cells are probably 2a each. 2p x 2a = 4a With that being said, mixing new batteries with used batteries put stresses on the new cells because during usage the used cells give u...
by e-beach
Mar 01 2019 1:20pm
Forum: General Discussion
Topic: Discharge balancing on Parallel batteries??
Replies: 7
Views: 273

Re: Discharge balancing on Parallel batteries??

What you are suggesting should mostly be fine depending on your wiring. I say mostly because I am not sure how you are going to keep you battery balanced at 64v. And, if you are going to give the GA cells 8 amps (not 4a) then you are pushing their standard charging limit. The wiring is key to what y...
by e-beach
Feb 28 2019 8:28pm
Forum: E-Bike Technical
Topic: Extending battery cable with crimps, avoid?
Replies: 5
Views: 218

Re: Extending battery cable with crimps, avoid?

Weather you crimp only, or crimp and tin, the key is not to let the wire flex where the crimp and copper wire separate. That would be where the wire frays. To know if they are working well enough, go WOT up a good hill so you reach 20a for a little while, stop the bike and feel the crimp to check if...
by e-beach
Feb 28 2019 12:55pm
Forum: E-Bike Technical
Topic: Motor controller not pulling rated amps
Replies: 20
Views: 626

Re: Motor controller not pulling rated amps

Yep, those are you shunts. However I don't remember anyone around here with the knowledge to read amp ratings from looking at the shunts. Modifying a shunt is not hard. a blob of solder will do it. However it is pretty-permanent once done so make sure you are 100% sure your controller doesn't have a...
by e-beach
Feb 27 2019 10:04pm
Forum: E-Bike Technical
Topic: Extending battery cable with crimps, avoid?
Replies: 5
Views: 218

Re: Extending battery cable with crimps, avoid?

As far as the durability of the amp draw, the only way to really know is by trying it. I never liked the way crimps worked. Some people use them a lot. I have had a lot of them fail. They can vibrate loose, and the wires can fray where the crimp ends. I prefer to crimp then solder them, then apply a...
by e-beach
Feb 27 2019 7:09pm
Forum: E-Bike General Discussion
Topic: Weight Distribution on Bikes
Replies: 16
Views: 312

Re: Weight Distribution on Bikes

Check out this video: https://spectrum.ieee.org/video/transportation/alternative-transportation/highspeed-classroom-building-an-electric-race-bike Edit: https://www.facebook.com/BuckeyeCurrent/photos/a.284031861624209/2104576572903053/?type=3&theater https://www.facebook.com/BuckeyeCurrent/photos/a....
by e-beach
Feb 26 2019 11:37pm
Forum: E-Bike General Discussion
Topic: Weight Distribution on Bikes
Replies: 16
Views: 312

Re: Weight Distribution on Bikes

Never built one, but where did Harley-Davidson put the weight. Unless you want to do wheel stands, I say low and centered.
elechd.jpg
elechd.jpg (102.26 KiB) Viewed 205 times

:D :bolt:
by e-beach
Feb 26 2019 11:24pm
Forum: E-Bike Technical
Topic: Controller Discharging?
Replies: 3
Views: 134

Re: Controller Discharging?

The reason your controller keeps a small charge is because one or more of the capacitors in your controller has kept a charge. There is most-likely a bleed resistor that over a period of time will discharge the controller. In any case it does no harm to the controller to leave the capacitors with th...