Search found 612 matches

by dmwahl
Aug 11 2020 7:58pm
Forum: Battery Technology
Topic: 3-192S Arduino BMS (using BQ76PL536A)
Replies: 80
Views: 24997

Re: 3-192S Arduino BMS (using BQ76PL536A)

Hello everyone, I started a project similar to this project. I am using BQ76PL455A-Q1 instead of BQ76PL534. I have difficulties in communication. I do the communication over UART but I cannot get cell voltages from BQ. How should I proceed? :( Here's my generic advice, I'm not too familiar with the...
by dmwahl
Apr 22 2020 3:00pm
Forum: Items for Sale - New
Topic: Heavy Duty Torque Arm - Disc mount, clamping optional $35
Replies: 107
Views: 21294

Re: Heavy Duty Torque Arm - Disc mount, clamping optional $35

I don't know if that means I won or not but I received payment at 9:14 AM local time, printed the shipping label at 9:24, and walked them to the mailbox a few minutes later. :bigthumb:
by dmwahl
Apr 15 2020 9:58pm
Forum: Items for Sale - New
Topic: Heavy Duty Torque Arm - Disc mount, clamping optional $35
Replies: 107
Views: 21294

Re: Heavy Duty Torque Arm - Disc mount, clamping optional $35

Purchase link and instructions are on the first post, page 1.
by dmwahl
Mar 29 2020 10:06am
Forum: Items for Sale - New
Topic: Heavy Duty Torque Arm - Disc mount, clamping optional $35
Replies: 107
Views: 21294

Re: Heavy Duty Torque Arm - Disc mount, clamping optional $35

Thanks tolkaNo, always good to hear feedback. Mind sharing a build thread or what motor, controller settings, bike, etc you used it on?
by dmwahl
Mar 29 2020 9:17am
Forum: Items for Sale - New
Topic: Heavy Duty Torque Arm - Disc mount, clamping optional $35
Replies: 107
Views: 21294

Re: Heavy Duty Torque Arm - Disc mount, clamping optional $35

You're all in luck... I found 9 more in a box in my basement when I was cleaning and can ship immediately. If these go quickly I may order another batch, we shall see.
by dmwahl
Jun 12 2019 3:54pm
Forum: Battery Technology
Topic: NEW FLEXVOLT 20-60V dewalt battery
Replies: 17
Views: 3202

Re: NEW FLEXVOLT 20-60V dewalt battery

Funny they bothered to have the added complexity. It's precisely the same power available in a brush less power tool you get to design yourself at 5s or 15s. 5s is just a more simple low cost BMS in trade for a few cents of thicker wiring for a few inches. They did it to use more powerful motors, m...
by dmwahl
Nov 14 2018 11:32am
Forum: Items for Sale - New
Topic: Hybrid Power 2WD E-Bike Project Development
Replies: 9
Views: 1030

Re: Hybrid Power 2WD E-Bike Project Development

Although I will admit the picture on the gogetfunding page of the electronics with the multicolored explosion background had me convinced for a while, this is just another HHO, free energy, etc scam. You can't get more energy out of water by splitting it into hydrogen/oxygen and then recombining it ...
by dmwahl
May 08 2018 2:12pm
Forum: Battery Technology
Topic: Yet another BMS
Replies: 74
Views: 13916

Re: Yet another BMS

Did you have to duplicate the read process? I haven't had any issues reading from the ROM with only a single write. I have a 1ms wait between sending the address byte to read and doing the actual read since the datasheet says it takes ~200us to read from ROM, but I didn't need to do the read twice. ...
by dmwahl
May 07 2018 3:07pm
Forum: Battery Technology
Topic: Yet another BMS
Replies: 74
Views: 13916

Re: Yet another BMS

is it normal have disconnect the battery to save values in ROM? No, there's a process to write to ROM detailed in one of the app notes. I forget the details but as I recall it's basically the following steps with a wait between them to allow it to actually do the write. 1) Enable EEPROM access 2) W...
by dmwahl
Mar 22 2018 6:47am
Forum: Items for Sale - New
Topic: Heavy Duty Torque Arm - Disc mount, clamping optional $35
Replies: 107
Views: 21294

Re: Heavy Duty Torque Arm - Disc mount, clamping optional $35

cwah wrote:
Mar 21 2018 7:28pm
Do you still have for sale? Thanks
Yep, plenty available. I ordered a whole bunch of them and they’ve been selling regularly. I should probably post periodically so people know they’re still available.
by dmwahl
Oct 14 2017 9:56pm
Forum: Items for Sale - New
Topic: Heavy Duty Torque Arm - Disc mount, clamping optional $35
Replies: 107
Views: 21294

Re: Heavy Duty Torque Arm - Disc mount, clamping optional $3

A single arm seems to be the most common, just based on the fact that maybe 80% of people only order 1. Maybe they're using a different one for the other side, but I don't think 2 are necessary for most people. Then again I like selling 2 at a time, so maybe just order 2 to be on the safe side :)
by dmwahl
Oct 14 2017 7:45pm
Forum: Items for Sale - New
Topic: Heavy Duty Torque Arm - Disc mount, clamping optional $35
Replies: 107
Views: 21294

Re: Heavy Duty Torque Arm - Disc mount, clamping optional $3

shorza wrote:What are people doing for the non disk side? Has anyone DP420 epoxied these torque arms to the frame?
It wasn't the intent of the design to epoxy them, but if you look a few posts above this one someone was planning on doing just that. Perhaps he will chime in here...
by dmwahl
Oct 05 2017 2:01pm
Forum: Items for Sale - New
Topic: Heavy Duty Torque Arm - Disc mount, clamping optional $35
Replies: 107
Views: 21294

Re: Heavy Duty Torque Arm - Disc mount, clamping optional $3

About clamping.. i don't really think u can clamp a 9.5mm of harden steel You can actually get a measurable deflection using a M6 screw and hand tightening it. Whether or not it's needed is another matter altogether, but I've measured several tenths of a mm deflection when tightening the clamping b...
by dmwahl
Jun 28 2017 12:35pm
Forum: Items for Sale - New
Topic: Heavy Duty Torque Arm - Disc mount, clamping optional $35
Replies: 107
Views: 21294

Re: Heavy Duty Torque Arm - Disc mount, clamping optional $3

I don't think these here will work on front fork...? If I am wrong please correct me. This was resolved via PM, but for the benefit of everyone else the torque arm was designed for a rear fork, but there's no fundamental reason it wouldn't work on a front fork. The angle of the flats relative to th...
by dmwahl
Apr 21 2017 8:46am
Forum: Items for Sale - New
Topic: Heavy Duty Torque Arm - Disc mount, clamping optional $35
Replies: 107
Views: 21294

Re: Heavy Duty Torque Arm - Disc mount, clamping optional $3

Swe wrote:I would like to buy one for front fork IS. Have sent PM but don't think you have read it yet.
I don't see any PMs from you, try again perhaps?
by dmwahl
Apr 04 2017 8:53am
Forum: Items for Sale - New
Topic: Heavy Duty Torque Arm - Disc mount, clamping optional $35
Replies: 107
Views: 21294

Re: Heavy Duty Torque Arm - Disc mount, clamping optional $3

pwd wrote:...fabri-cobble...
Haven't heard that one before, I'm going to have to borrow it from now on.
by dmwahl
Mar 25 2017 7:52pm
Forum: Items for Sale - New
Topic: Heavy Duty Torque Arm - Disc mount, clamping optional $35
Replies: 107
Views: 21294

Re: Heavy Duty Torque Arm - Disc mount, clamping optional $3

rich43 wrote:I paid but sent two $50 payments by mistake as PayPal glitched, can you refund one and keep the other as payment for the torque arm?
Done.
by dmwahl
Mar 25 2017 1:50pm
Forum: Items for Sale - New
Topic: Heavy Duty Torque Arm - Disc mount, clamping optional $35
Replies: 107
Views: 21294

Re: Heavy Duty Torque Arm - Disc mount, clamping optional $3

rich43 wrote:I have sent you a PM, I am interested in ordering one. :)
Replied.
by dmwahl
Mar 22 2017 1:51pm
Forum: Items for Sale - New
Topic: Heavy Duty Torque Arm - Disc mount, clamping optional $35
Replies: 107
Views: 21294

Re: Heavy Duty Torque Arm - Disc mount, clamping optional $3

rich43 wrote:Are these still for sale?
You bet. I have stock and have been getting them in the mail within a day or two of ordering.
by dmwahl
Nov 07 2016 2:41pm
Forum: Items for Sale - New
Topic: Heavy Duty Torque Arm - Disc mount, clamping optional $35
Replies: 107
Views: 21294

Re: Heavy Duty Torque Arm - IS mount, clamping optional $35

999zip999 wrote:Does it fit a diamond back response ? It looks like it.
Can't say for sure, I only have room for so many bikes... Print out the template on the first post and that will tell you.
by dmwahl
Oct 20 2016 4:04pm
Forum: Battery Technology
Topic: Issue with Headway 40152 battery pack
Replies: 11
Views: 1750

Re: Issue with Headway 40152 battery pack

There's likely some damage to the 0V cells, but not necessarily enough to be a problem. LFP is more tolerant of abuse than some of the other Li-ion varieties. The longer you wait to recharge them the worse the problem will be. I've done the same accidentally on my lawnmower pack (8S2P, headway LFP)....
by dmwahl
Oct 18 2016 2:50pm
Forum: Battery Technology
Topic: BMS 12 AWG enough?
Replies: 12
Views: 1083

Re: BMS 12 AWG enough?

Oh ok, so I missed the part with the shunt, so they thicken up the shunt to pass more current and then also thicken up the traces to handle the extra current the shunt will pass right? The shunt is just a precise, low value resistor. The controller measures the voltage across the shunt to calculate...
by dmwahl
Oct 18 2016 12:34pm
Forum: Battery Technology
Topic: BMS 12 AWG enough?
Replies: 12
Views: 1083

Re: BMS 12 AWG enough?

But don't thinner wires able to transfer less amps since they have only limited amount of surface (thickness) to them to transfer the 80A (for that example)? There's no real limit to how much current the wire can carry, as long as it's not enough to damage the wire. You could send 1000A through 32a...
by dmwahl
Oct 17 2016 1:07pm
Forum: Battery Technology
Topic: BMS 12 AWG enough?
Replies: 12
Views: 1083

Re: BMS 12 AWG enough?

As far as peak current, it doesn't depend on wire length, it's just a matter of power per unit length, and how well the wire can shed heat without getting too hot. The problem comes when you start either overheating something or wasting a significant portion of your total power in anything other tha...