Search found 231 matches

by PJD
Apr 10 2020 10:49am
Forum: Items for Sale - Used
Topic: [sold] Parts-stocked analog electronics workshop house with some former ebike projects on site in S. OH USA
Replies: 16
Views: 1349

Re: [sold] Parts-stocked analog electronics workshop house with some former ebike projects on site in S. OH USA

Few members of this forum must live here in the the depopulating rust belt or Appalachia I guess. You see "we give cash on the spot for your house" ad signs all the time around here. And the contents of the house can sometimes be worth more than the structure and lot!
by PJD
Apr 10 2020 10:34am
Forum: Items for Sale - Used
Topic: FREE - 24, Well Used, 60AH GBS Cells - SOLD
Replies: 2
Views: 1231

Re: FREE - 24, Well Used, 60AH GBS Cells

Sorry, I found someone in Connecticut to take them in early February. It may interest other readers that I ended up using Roadie (kind of an Uber for shipping) to ship them and it worked well. You cannot ship "fully regulated" large lithium cells via UPS or FedEx unless you have a commercial hazmat ...
by PJD
Jan 26 2020 11:54pm
Forum: Items for Sale - Used
Topic: FREE - 24, Well Used, 60AH GBS Cells - SOLD
Replies: 2
Views: 1231

FREE - 24, Well Used, 60AH GBS Cells - SOLD

I have, to give away, 24, 60 AH GBS cells (4.6 kWh), mfg date ca. 2011, formerly used in a Current Motor maxi-scooter. They are probably no longer adequate for EV use due to power capacity degradation, but they still have at least 90 percent of their rated Wh capacity as long as they are not dischar...
by PJD
Aug 15 2019 9:41pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: We regret to inform you that scooters aren’t actually good for the environment
Replies: 4
Views: 751

Re: We regret to inform you that scooters aren’t actually good for the environment

Different kind of so-called "scooter"! This forum discusses real scooters of the electric-powered variety.
by PJD
Apr 11 2017 5:09pm
Forum: Items for Sale - New
Topic: QS MOTOR,0.5-14kW Electric Hub Motor Manufacture China
Replies: 1340
Views: 268580

Re: QS MOTOR,0.5-14kW Electric Hub Motor Manufacture China

What about them? http://zelectricvehicle.com/index.html Yes; the owner and the place where ZEV's are assembled are near where I live. Maybe the quality has improved but when I test rode a couple of their models in 2011 I was not too impressed. Even if the quality has improved, they still don't have...
by PJD
Apr 11 2017 4:58pm
Forum: Items for Sale - New
Topic: QS MOTOR,0.5-14kW Electric Hub Motor Manufacture China
Replies: 1340
Views: 268580

Re: QS MOTOR,0.5-14kW Electric Hub Motor Manufacture China

bigbore and parabelluim, The crack is too thin to photograph I would have probably needed dye penetrant testing if I didn't know right were to look. but no doubt widens under the air pressure load. Obviously, a crack in a car or motorcycle wheel is potentially dangerous structural defect, the fact t...
by PJD
Apr 09 2017 2:16pm
Forum: Items for Sale - New
Topic: QS MOTOR,0.5-14kW Electric Hub Motor Manufacture China
Replies: 1340
Views: 268580

Re: QS MOTOR,0.5-14kW Electric Hub Motor Manufacture China

DasDouble wrote:What is this IIRC?
abbreviation for "If I recall correctly"
by PJD
Apr 09 2017 12:00pm
Forum: Items for Sale - New
Topic: QS MOTOR,0.5-14kW Electric Hub Motor Manufacture China
Replies: 1340
Views: 268580

Re: QS MOTOR,0.5-14kW Electric Hub Motor Manufacture China

My motor is essentially the same as the one below except for being a V2 with the greater number of poles. This would be the one I would have to get if I have to replace the whole thing as the V3 is not much more expensive. $681 with shipping. https://www.aliexpress.com/store/product/New-Designed-600...
by PJD
Apr 08 2017 9:58pm
Forum: Items for Sale - New
Topic: QS MOTOR,0.5-14kW Electric Hub Motor Manufacture China
Replies: 1340
Views: 268580

Re: QS MOTOR,0.5-14kW Electric Hub Motor Manufacture China

markz, The wheel is integral with the motor - so a welding repair is likely to damage the expensive motor. My point was that the the wheel rim needs to be detachable from the motor for repair or replacement - like any other kind of vehicle. The hub motor/wheel assembly cannot be attached to any kind...
by PJD
Apr 08 2017 4:50pm
Forum: Items for Sale - New
Topic: QS MOTOR,0.5-14kW Electric Hub Motor Manufacture China
Replies: 1340
Views: 268580

Re: QS MOTOR,0.5-14kW Electric Hub Motor Manufacture China

A few questions for QS Motor... I have a scooter with an older model 13-inch QS motor used in a Current Motor Company maxi-type scooter which was assembled at their facility in Ann Arbor, Michigan, USA. Current Motor is now out of business and I am unable to contact their former engineers/managers o...
by PJD
Aug 30 2011 12:20am
Forum: Battery Technology
Topic: HP 3kW PSU - charging solution
Replies: 62
Views: 6747

Re: HP 3kW PSU - charging solution

Er... in the USA "hire" refers to employing someone and is used in no other way. The correct word you needed to use is "rent" a boat. Don't expect a USAn to know all the strange words you Brits use. Also, try to speak more clearly. Especially, learn to properly pronounce "Glass of water" or you migh...
by PJD
Aug 28 2011 3:02pm
Forum: Battery Technology
Topic: "Zephyr" - Finally, the "v4" Fechter/Goodrum/Hecker BMS...
Replies: 951
Views: 147388

Re: "Zephyr" - Finally, the "v4" Fechter/Goodrum/Hecker BMS.

I received my V 4.4.3 boards, Instruction and BOM, and have ordered the parts. FYI,with no MTA connectors, and the slightly cheaper plain aluminum Hammond box, the bill was $94.11. I have couple questions and comments: 1. As someone else commented way back, resistor R14 is still listed on the BOM, i...
by PJD
Aug 25 2011 10:22pm
Forum: Battery Technology
Topic: "Zephyr" - Finally, the "v4" Fechter/Goodrum/Hecker BMS...
Replies: 951
Views: 147388

Re: "Zephyr" - Finally, the "v4" Fechter/Goodrum/Hecker BMS.

Gary or Richard, After receiving the board, I just noticed that the instructions say the CV voltage of the charger must be adjustable. However, this isn't the case on the chargers I have, which are currently being used with my old 16-cell V1.5 boards. These charger's CV voltage is permanently at abo...
by PJD
Aug 17 2011 8:58pm
Forum: Battery Technology
Topic: Charging my new thundersky pack
Replies: 11
Views: 1589

Re: Charging my new thundersky pack

What type of BMS will you be using? The Zephyr BMS (do a search on this forum) is fairly unique in that it will work with ordinary Pb-acid chargers. Most others need a purpose-built charger that can be switched to a low rate of charge once the balancing starts. Also, for the 20-cell pack you have, a...
by PJD
Jun 24 2010 10:22pm
Forum: Battery Technology
Topic: Even Newer 4 to 24-cell Battery Management System (BMS)
Replies: 2168
Views: 279636

Re: Even Newer 4 to 24-cell Battery Management System (BMS)

Actually, this makes sense. The less-healthy cells will have less capacity, so they will get "full" first, and will hit the HVC point first. That is another way of viewing it, although if they were balanced to start off, they should be discharged the same amount and should reach "full" at the same ...
by PJD
Jun 23 2010 8:19pm
Forum: Battery Technology
Topic: Even Newer 4 to 24-cell Battery Management System (BMS)
Replies: 2168
Views: 279636

Re: Even Newer 4 to 24-cell Battery Management System (BMS)

Fechter wrote: Ver2.6 did a forced balance, then shut down. This is OK if all your cells are healthy and well matched. It is thought that the charge should terminate as soon as all the 'healthy' cells reach target and not be held on float while lower cells are brought up on every charge cycle. In th...
by PJD
Jun 17 2010 12:23am
Forum: Battery Technology
Topic: Even Newer 4 to 24-cell Battery Management System (BMS)
Replies: 2168
Views: 279636

Re: Even Newer 4 to 24-cell Battery Management System (BMS)

Pat, unfortunately, you haven't missed much. :oops: We, on the other hand, have missed deadline after deadline with the v4.x BMS. :x After god nows how many iterations, I think we have the most stable design yet. No more oscillations and no more voltage drop issues and no more weirdness. Well, the ...
by PJD
Jun 14 2010 10:25pm
Forum: Battery Technology
Topic: Even Newer 4 to 24-cell Battery Management System (BMS)
Replies: 2168
Views: 279636

Re: Even Newer 4 to 24-cell Battery Management System (BMS)

Gary and Richard, I'm returning her from a long absence. I fortuitously blundered into your conversation with Dick since I may want to do the same expansion of my old v 1.5 boards as part of a 60V upgrade to the scooters - which continue to work just fine by the way. So, are any of the breakaway V2....
by PJD
Oct 06 2009 7:35pm
Forum: Battery Technology
Topic: Even Newer 4 to 24-cell Battery Management System (BMS)
Replies: 2168
Views: 279636

Re: Even Newer 4 to 24-cell Battery Management System (BMS)

Gary or Richard, Couple questions and comments: 1. Are new v 2.5/2.6 BMS boards available? I notice Gary's site says "out of stock". 2. My old V1.5 boards continue to work well on both the the scooters (16 cell 40AH, 8A charger) except for having to remember to unplug the charger at some point when ...
by PJD
Nov 21 2008 12:40pm
Forum: Battery Technology
Topic: Even Newer 4 to 24-cell Battery Management System (BMS)
Replies: 2168
Views: 279636

Re: Even Newer 4 to 24-cell Battery Management System (BMS)

At risk of drifting off-topic, I found little self-balancing effect with my Thundersky pack even when charging at just C/5 (8 amp). I'm not sure how far apart the voltages would get, because I'd always interrupt charging while watching the voltages like a souffle in the oven. But at the 59.5 volt cu...
by PJD
Nov 20 2008 10:08pm
Forum: E-Bike Technical
Topic: Help-Ping Charger Failure - fixed
Replies: 18
Views: 1743

Re: Help-Ping Charger Failure

Just noticed how old a thread this is...

Here's the data sheet for them...

http://www.gesensing.com/downloads/data ... 0_325a.pdf
by PJD
Nov 20 2008 9:01pm
Forum: E-Bike Technical
Topic: Help-Ping Charger Failure - fixed
Replies: 18
Views: 1743

Re: Help-Ping Charger Failure

I can't see the part in your picture, but the the NTC 10D 20 is a NTC Thermistor inrush suppressor - used commonly in most switchmode power supplies. It should be a dark disc shaped object that looks like a ceramic capacitor. Their function is to limit the inrush current into the big input rectifier...
by PJD
Nov 16 2008 1:59am
Forum: Battery Technology
Topic: Even Newer 4 to 24-cell Battery Management System (BMS)
Replies: 2168
Views: 279636

Re: Even Newer 4 to 24-cell Battery Management System (BMS)

In my case with an older board, once all the LED's are flashing, the charging current continues to decline, and the master LED only gradually changes from red to orange to yellow to greenish yellow. I am assuming that although all the shunts are on, they are still on a low-percent duty cycle, and th...
by PJD
Nov 16 2008 1:37am
Forum: Battery Technology
Topic: Even Newer 4 to 24-cell Battery Management System (BMS)
Replies: 2168
Views: 279636

Re: Even Newer 4 to 24-cell Battery Management System (BMS)

I never understood the purpose of the connections on the board for the charger positive and pack positive leads. Only the negative lead needs to go through the board and then to the negative pack terminal. The charging positive lead can simply be run directly to the positive terminal of the pack. Am...
by PJD
Nov 02 2008 11:49pm
Forum: Battery Technology
Topic: Even Newer 4 to 24-cell Battery Management System (BMS)
Replies: 2168
Views: 279636

Re: Even Newer 4 to 24-cell Battery Management System (BMS)

Richard, I now have about charge 35 cycles using the BMS on the two scooters with the 48 volt 40AH Thundersky cells. At end of charging with 8-amp chargers, the shunt indicator LEDs are generally all flickering with uniform brightness within about 15 minutes of the first LED going on. The bi-color p...