Search found 1047 matches

by Tommy L
Jun 24 2018 10:53pm
Forum: Battery Technology
Topic: Parallel BMS for 4 x 12v start battery in Parallel
Replies: 25
Views: 1722

Re: Parallel BMS for 4 x 12v start battery in Parallel

METHODS...... I'm still using your 9C2810 and controller (Justin 7225?) that you beefed up so I can run it at 50amps! I purchased from you years ago! I'm running that controller at 98.4V HOC. Lipo's 4.1v max per cell using Meanwells in parallel for bulk charging. 6 x 4s.... 10AH multi stars. 24s to...
by Tommy L
Jun 24 2018 10:52pm
Forum: Battery Technology
Topic: Parallel BMS for 4 x 12v start battery in Parallel
Replies: 25
Views: 1722

Re: Parallel BMS for 4 x 12v start battery in Parallel

Can I parallel the original BMS that I put in the OP. Will the discharge and balance features work in Parallel? As I noted here: https://endless-sphere.com/forums/viewtopic.php?p=1389948#p1389161 you shouldn't parallel the balance leads (of any BMS set), just the main charge and/or discharge leads....
by Tommy L
Jun 24 2018 1:40am
Forum: Battery Technology
Topic: Parallel BMS for 4 x 12v start battery in Parallel
Replies: 25
Views: 1722

Re: Parallel BMS for 4 x 12v start battery in Parallel

A rare word of caution from me... I am sure you are fine with a genset - but the other day I was jumping a 5.8L V8 with a pair of 4Ah 4S Lipo packs - and we managed to create a considerable fireball. Yea packs were out of balance Yea packs were low Yea its like a 500A draw Yea yea yea... But yea......
by Tommy L
Jun 23 2018 11:57am
Forum: Battery Technology
Topic: Parallel BMS for 4 x 12v start battery in Parallel
Replies: 25
Views: 1722

Re: Parallel BMS for 4 x 12v start battery in Parallel

I ordered the Bleed Circuits and will parallel them and not use the BMS to Top Balance. I'll use the BMS for it's other features to protect the cells in a low voltage scenario.

Does this sound good?

http://www.batteryspace.com/Balance-Mod ... -Pack.aspx
by Tommy L
Jun 23 2018 11:56am
Forum: Battery Technology
Topic: Parallel BMS for 4 x 12v start battery in Parallel
Replies: 25
Views: 1722

Re: Parallel BMS for 4 x 12v start battery in Parallel

I originally said 18650 cells.... they are in fact 26650 M1A's That makes a lot more sense...I have yet to handle an 18650 LiFePO4 cell that could do what those 26650s could, regarding current flow vs voltage sag/heat. (all the ones i've run into were "generic" stuff, as have been the ones I've rea...
by Tommy L
Jun 21 2018 7:45pm
Forum: Battery Technology
Topic: Parallel BMS for 4 x 12v start battery in Parallel
Replies: 25
Views: 1722

Re: Parallel BMS for 4 x 12v start battery in Parallel

I originally said 18650 cells....

they are in fact 26650 M1A's


So sorry for the misinformation. With all this new 18650 samsung stuff on the market as of late...... I wasnt thinking! :oops:
by Tommy L
Jun 21 2018 9:50am
Forum: Battery Technology
Topic: Parallel BMS for 4 x 12v start battery in Parallel
Replies: 25
Views: 1722

Re: Parallel BMS for 4 x 12v start battery in Parallel

All great responses here! And I thank you all. Looks like I might be better off with a bleed circuit board for each of the 4 batteries. I could parallel all the jst-xh and send them to 4 of these boards. Over charge protection is paramount. http://www.batteryspace.com/Balance-Module-for-3.2V-LiFePO4...
by Tommy L
Jun 20 2018 10:17pm
Forum: Battery Technology
Topic: Parallel BMS for 4 x 12v start battery in Parallel
Replies: 25
Views: 1722

Re: Parallel BMS for 4 x 12v start battery in Parallel

parabellum wrote:
Jun 20 2018 4:54pm
What is your plan for charging them, with BMS you linked?
yes...... so the question is ..... Can I run 4 BMS in parallel?
by Tommy L
Jun 20 2018 10:16pm
Forum: Battery Technology
Topic: Parallel BMS for 4 x 12v start battery in Parallel
Replies: 25
Views: 1722

Re: Parallel BMS for 4 x 12v start battery in Parallel

How much current does the startup need? If it's anything like that needed by a car, you may not find an affordable BMS that can handle it, even with several in parallel. This all assumes your cells can handle the current (which I wouldn't guarantee, as most of the generic 18650 LiFePO4 stuff is bar...
by Tommy L
Jun 20 2018 9:52pm
Forum: Battery Technology
Topic: Parallel BMS for 4 x 12v start battery in Parallel
Replies: 25
Views: 1722

Re: Parallel BMS for 4 x 12v start battery in Parallel

parabellum wrote:
Jun 20 2018 4:54pm
What is your plan for charging them, with BMS you linked?
yes, from the generator after startup. If the bleed circuits can handle it, but I'm thinking that the voltage regulator will also limit the current from the generator charging system.
by Tommy L
Jun 20 2018 10:48am
Forum: Battery Technology
Topic: Parallel BMS for 4 x 12v start battery in Parallel
Replies: 25
Views: 1722

Parallel BMS for 4 x 12v start battery in Parallel

Hello fellow EVers....... I have a need to take some my old LiFePO4 batteries 4P4S 26650's A123 M1's 12.8v nominal and add a BMS board. These will be used for start batteries for a generator. I believe the incoming charge current will be low as the voltage of these batteries sit around 13.2v. My que...
by Tommy L
Nov 26 2017 7:12pm
Forum: E-Bike Technical
Topic: Meanwell question......
Replies: 0
Views: 363

Meanwell question......

When I run 2 meanwells in series......
Sometimes one will not volt up.....
So I unplug - wait - plug back in...... and
It’s good.

Is there a startup technique I need to do while
these are in series?
by Tommy L
Nov 26 2017 7:03pm
Forum: Battery Technology
Topic: What is the "Light Weight" go to "Hobby" Lithium packs
Replies: 43
Views: 4176

Re: What is the "Light Weight" go to "Hobby" Lithium packs

Am curious for these types of packs -- how well are they maintaining their balance when used this way? What is the estimated lifetime of these types of packs - same as modern 18650 cells? Nice seeing a reasonable option, thanks for sharing. After a couple of charge cycles..... the discharge Seems t...
by Tommy L
Nov 07 2017 1:35pm
Forum: Battery Technology
Topic: MultiStar 6S/5200 mAh on sale from US warehouse
Replies: 22
Views: 2292

Re: MultiStar 6S/5200 mAh on sale from US warehouse

Also to note: My 4s 10ah Multistars in a 24s configuration during BULK charge with my MeanWell Chargers........ All the cells come up very even..... to within 100th of a volt. I'm very happy of this...... my LiFePO4's never did this....... i'd have to watch them very closely for runaway cells.
by Tommy L
Nov 07 2017 1:20pm
Forum: Battery Technology
Topic: MultiStar 6S/5200 mAh on sale from US warehouse
Replies: 22
Views: 2292

Re: MultiStar 6S/5200 mAh on sale from US warehouse

I'm loving my Multistars 4s 10ah packs 6 in series 24s 100.8v max.... only charge to 4.1v per cell for 98.4v total. I'm using two MeanWells in series set to 97.2v for a cell level charge of 4.05v..... then I top it off with my BC168 through the jst connectors to 4.1v. I'm very impressed with them. M...
by Tommy L
Nov 03 2017 12:53pm
Forum: E-Bike General Discussion
Topic: Best donor frame to build an electric bike & getting started
Replies: 44
Views: 7650

Re: Best donor frame to build an electric bike & getting sta

One must keep in mind that Rim Brakes are grabbing something that is turning slower than grabbing closer to the hub, which is turning much faster. You've got that backwards. The RPMs would obviously be the same, but the surface feet per minute is much higher at the rim. Just to add my 2¢ to the dis...
by Tommy L
Nov 02 2017 9:41pm
Forum: E-Bike Technical
Topic: Mean-Wells
Replies: 13
Views: 1155

Re: Mean-Wells

Ykick wrote:Rockin' tip.

If you have a moment could you share the measured highest/lowest voltage that model outputs adjusted maximum? Specs show 27-54VDC so if it reaches 54.6V it could be useful solution for 48V pack charging?

Mine went to 59v

I just cranked it at 10:40PM 11/02/17

:)
by Tommy L
Nov 02 2017 12:31pm
Forum: Battery Technology
Topic: MultiStar 6S/5200 mAh on sale from US warehouse
Replies: 22
Views: 2292

Re: MultiStar 6S/5200 mAh on sale from US warehouse

4s 10ah MultiStars On Sale at the US Warehouse! for about $40.00 each!
by Tommy L
Nov 02 2017 12:30pm
Forum: E-Bike Technical
Topic: Mean-Wells
Replies: 13
Views: 1155

Re: Mean-Wells

ARROW has great price on MeanWells and free overnight shipping!

https://www.arrow.com/en/products/hlg-3 ... nterprises
by Tommy L
Nov 02 2017 12:25pm
Forum: E-Bike Technical
Topic: Mean-Wells
Replies: 13
Views: 1155

Re: Mean-Wells

I got my second MeanWell in! Bulk charge my full series pack..... much better than bulk charging half the pack in series twice, or paralleling the tore down pack! 5amps at 97.2V (4.05 per cell) brings that 10ah 100.8v pack up QUICK! love it! I should have done meanwells years ago. Although I did pur...
by Tommy L
Nov 02 2017 12:20pm
Forum: E-Bike General Discussion
Topic: Best donor frame to build an electric bike & getting started
Replies: 44
Views: 7650

Re: Best donor frame to build an electric bike & getting sta

I was thinking more about the pressure per square inch the pads apply. Each type of brake has its pros and cons. It just isn't the simple slam dunk your previous post suggests. It is more of a "horses for courses" and personal preference issue. Both can work very well for an e-bike. It just depends...
by Tommy L
Nov 02 2017 12:14pm
Forum: Battery Technology
Topic: What is the "Light Weight" go to "Hobby" Lithium packs
Replies: 43
Views: 4176

Re: What is the "Light Weight" go to "Hobby" Lithium packs

Mine are 4s 16ah and I love them. Ever thought about trying them on your lawnmower Tommy L? I moved from Canada to Florida, USA. I dissembled the Lawn Tractor and saved all but the chassis. [youtube]ygu8bV423wU&t=16s[/youtube] I purchased the 10ah 4s packs for size and being able to add another 10a...
by Tommy L
Nov 01 2017 10:46pm
Forum: E-Bike General Discussion
Topic: Best donor frame to build an electric bike & getting started
Replies: 44
Views: 7650

Re: Best donor frame to build an electric bike & getting sta

This is a very informative video on Proportion Valve

by Tommy L
Nov 01 2017 10:38pm
Forum: E-Bike General Discussion
Topic: Best donor frame to build an electric bike & getting started
Replies: 44
Views: 7650

Re: Best donor frame to build an electric bike & getting sta

Properly designed brakes to the job very well. That would include a properly engineered Drum Brake. Some appearance of better performance of rear Disc brakes with calipers maybe because of design and weight of a vehicle. You may also be fooled into it being better because of a newer model cars propo...
by Tommy L
Nov 01 2017 10:31pm
Forum: E-Bike General Discussion
Topic: Best donor frame to build an electric bike & getting started
Replies: 44
Views: 7650

Re: Best donor frame to build an electric bike & getting sta

my Juicy Hydraulic on the front is nice..... but my rear still has the Rim brake and it works very well. One must keep in mind that Rim Brakes are grabbing something that is turning slower than grabbing closer to the hub, which is turning much faster. Apparently, Rim brakes will out perform a cheap ...