Search found 16 matches

by TimJ
Feb 15, 2018 8:17 am
Forum: Battery Technology
Topic: cell imbalance in new hobby king lipo pack
Replies: 8
Views: 243

Re: cell imbalance in new hobby king lipo pack

I'll post back when I have results. I will do a normal balance charge to full and then will be storing them for a little while before I am ready to use. Will monitor periodically. Without doing anything else, the one cell was down another few hundredths of a V, while the others remain strong, so I a...
by TimJ
Feb 15, 2018 8:12 am
Forum: E-Bike Technical
Topic: Hobbyking 6S BMS
Replies: 21
Views: 607

Re: Hobbyking 6S BMS

Yes to all. Note that the battery medics (BM's) referenced in this thread are not the same as a bms (battery management system), so careful not to confuse the two when reading. More often than not, when someone says bms/BMS, they are referring to the management sysstem. But the battery medics can be...
by TimJ
Feb 13, 2018 8:01 pm
Forum: Battery Technology
Topic: cell imbalance in new hobby king lipo pack
Replies: 8
Views: 243

Re: cell imbalance in new hobby king lipo pack

Ok, good to hear that I am over-reacting. I had just read thru the Neptronix lipo tutorial (again) and it said early on that a difference over 0.10 volts was a bad sign, so I was feeling concerned. Whenever I buy something new, I want it to work perfectly at the start, so this is part of my reaction...
by TimJ
Feb 13, 2018 9:47 am
Forum: E-Bike Technical
Topic: Hobbyking 6S BMS
Replies: 21
Views: 607

Re: Hobbyking 6S BMS

Thanks for the detailed reply, motomech. This is very helpful.

-Tim
by TimJ
Feb 12, 2018 9:01 pm
Forum: Battery Technology
Topic: cell imbalance in new hobby king lipo pack
Replies: 8
Views: 243

cell imbalance in new hobby king lipo pack

I received my Multistar lipos from hobbyking the other day and had tested out all cells in each pack over the weekend. Out of the box, everything was at 3.75V +/- 0.05 except for one pack where one cell was at 3.6V. Based on what I read in Neptronix's Lipo tutorial, I felt like this is probably a ba...
by TimJ
Feb 12, 2018 8:50 pm
Forum: E-Bike Technical
Topic: Hobbyking 6S BMS
Replies: 21
Views: 607

Re: Hobbyking 6S BMS

Thanks for the feedback, Amberwolf. One other thing I thought about and was wondering if it would help keep cells balanced is to parallel individual cells together across the strings using the balance cables and just leave them that way all the time. With the right connections, the cells in both str...
by TimJ
Feb 11, 2018 10:25 pm
Forum: E-Bike Technical
Topic: Hobbyking 6S BMS
Replies: 21
Views: 607

Re: Hobbyking 6S BMS

Hi Motomech, I've noticed several of your posts on the topic of bulk charging lipos using the battery medics as a cell monitor and balancer. I was wondering if you feel it's important to have one attached to every pack throughout the charge. As an alternative, I was thinking it would serve the same ...
by TimJ
Jan 01, 2018 8:59 pm
Forum: E-Bike General Discussion
Topic: planning new ebike build - several questions
Replies: 11
Views: 645

Re: planning new ebike build - several questions

Hi Scooterman, Happy New Year to you! Thank you for sending the data when running at different power levels on your Mac. This is helpful. I had looked at your build page before and like the setup a lot. I had actually considered the Mac motor for my build initially. However, I asked EM3EV about the ...
by TimJ
Dec 31, 2017 12:32 pm
Forum: E-Bike General Discussion
Topic: Newbie with an ebike
Replies: 36
Views: 1637

Re: Newbie with an ebike

It's a nice looking set up. I'm looking to do something similar. What is the donor bike you used?
by TimJ
Dec 31, 2017 5:57 am
Forum: E-Bike General Discussion
Topic: planning new ebike build - several questions
Replies: 11
Views: 645

Re: planning new ebike build - several questions

I've been researching a bit more on the frames and suspension and associated costs. You really hit the nail on the head with your comment: "Those of us that want good performance always find out that it costs more than what we wanted and at first thought." The cost for the ebike frame and suspension...
by TimJ
Dec 29, 2017 9:45 am
Forum: E-Bike General Discussion
Topic: planning new ebike build - several questions
Replies: 11
Views: 645

Re: planning new ebike build - several questions

Thanks for the info, Scooterman. My fork is a Manitou Minute 29er with 100 mm travel and it is both tapered and through axle. It sounds like what you described might be a good option for me. I'll be doing some more research about the 29er fork with standard 26" frame and will have a look at the thre...
by TimJ
Dec 28, 2017 10:12 pm
Forum: E-Bike General Discussion
Topic: planning new ebike build - several questions
Replies: 11
Views: 645

Re: planning new ebike build - several questions

Good comments about the frame that I hadn't thought about. Thanks! I did see mention of the Monocog frame cracking with hard riding but I never considered that this would be likely on an ebike or that it could equate to injury other than to the bike itself. I figured a solid re-weld could put it bac...
by TimJ
Dec 27, 2017 10:09 pm
Forum: E-Bike General Discussion
Topic: planning new ebike build - several questions
Replies: 11
Views: 645

planning new ebike build - several questions

Greetings! I've been reading up on ebikes and options available recently but I feel like I've been drinking from the fire hose and have only scratched the surface on all the information in ES... After my initial research I believe I have a starting plan for my ebike build and have some time availabl...
by TimJ
Nov 22, 2017 10:46 pm
Forum: E-Bike General Discussion
Topic: Having trouble deciding what to use on my ebike build
Replies: 17
Views: 1089

Re: Having trouble deciding what to use on my ebike build

Hey PizzaWizard, I am planning to do a build very similar to yours and looking at many of the same components. I was wondering about the wheel choice you made for the 29er. You showed the 700c wheel in your list of items, but initially you had mentioned the 29" version. I see the cost is quite a bit...
by TimJ
Jul 08, 2017 5:28 pm
Forum: E-Bike Technical
Topic: Analysis of regen on an ebike
Replies: 123
Views: 32230

Re: Regen Efficiency

Can anyone provide more input on this? Thanks, Tim I came across this post and was really interested in the analysis. One thing I don't understand is that the maximum energy regenerated is only 50% of the energy available from the initial kinetic energy. I'm not an electrical engineer, so I didn't f...
by TimJ
Jul 04, 2017 3:01 pm
Forum: E-Bike Technical
Topic: Analysis of regen on an ebike
Replies: 123
Views: 32230

Re: Regen Efficiency

I came across this post and was really interested in the analysis. One thing I don't understand is that the maximum energy regenerated is only 50% of the energy available from the initial kinetic energy. I'm not an electrical engineer, so I didn't follow the argument for why it would be limited to t...