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by GGoodrum
Dec 08 2011 4:07pm
Forum: Battery Technology
Topic: 12s2p LiPo pack kit including 12-channel BMS "Lite" Board
Replies: 168
Views: 25299

Re: 12s2p LiPo pack kit including 12-channel BMS "Lite" Boar

I started a for sale thread over here: http://endless-sphere.com/forums/viewto ... 95#p501227

Everything is in stock, and all orders from this point will ship out the same day the order is received, if it is before about 3:00 pm PST.

-- Gary
by GGoodrum
Dec 08 2011 4:04pm
Forum: Battery Technology
Topic: "Zephyr" - Finally, the "v4" Fechter/Goodrum/Hecker BMS...
Replies: 951
Views: 123440

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

I started a "for sale" thread for the BMS Lite kit combos here: http://endless-sphere.com/forums/viewtopic.php?f=31&t=34495#p501227 Everything is in stock, and the kits will go out the same day they are ordered, from this point forward. :) The full-size Zephyr boards/kits will be available in anothe...
by GGoodrum
Nov 30 2011 6:27pm
Forum: Battery Technology
Topic: "Zephyr" - Finally, the "v4" Fechter/Goodrum/Hecker BMS...
Replies: 951
Views: 123440

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

This is one of the areas I don't fully understand. So "healthy" cells tend to stay pretty well balanced, but "healthy" cells age and become "less healthy". Will the Lite version still be capable of balancing those cells? In other words, is the Lite version capable of balanced charging a drastically...
by GGoodrum
Nov 30 2011 1:24pm
Forum: Battery Technology
Topic: "Zephyr" - Finally, the "v4" Fechter/Goodrum/Hecker BMS...
Replies: 951
Views: 123440

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

This whole process has been agonizingly slow but we can't sell stuff that doesn't work properly. Gary will be reviving his web site once we have product to sell. This should contain a description of the various options. The latest revision boards are getting made now, and once again we have to buil...
by GGoodrum
Nov 27 2011 1:08pm
Forum: Battery Technology
Topic: 12s2p LiPo pack kit including 12-channel BMS "Lite" Board
Replies: 168
Views: 25299

Re: 12s2p LiPo pack kit including 12-channel BMS "Lite" Boar

So that's what you are actually using for the production board? The 3.0V of the TC54 voltage detector? Which one is it? TC54VN (open-drain, 2.9V) or TC54VC (push-pull, 3.0V)? Actually either the "N" or the "C" version will work fine. The ones I have here are the TC54VN3002EZB-ND . One final (hopefu...
by GGoodrum
Nov 27 2011 9:37am
Forum: Battery Technology
Topic: 12s2p LiPo pack kit including 12-channel BMS "Lite" Board
Replies: 168
Views: 25299

Re: 12s2p LiPo pack kit including 12-channel BMS "Lite" Boar

Gary, what changes are needed to support laptop 18650 cells? 18650 cells are also Lithium Cobalt like RC Lipo, but can be discharged down to 3.00V (as opposed to 3.xxV for RC Lipo). Is it just a matter of substituting certain components to lower the LVC? Thanks. Yes, you could simply change out the...
by GGoodrum
Nov 27 2011 2:14am
Forum: Battery Technology
Topic: 12s2p LiPo pack kit including 12-channel BMS "Lite" Board
Replies: 168
Views: 25299

Re: 12s2p LiPo pack kit including 12-channel BMS "Lite" Boar

richmpdx wrote:Very good news that this is ready to go. Gary, is there a substitute BOM if one wants to build this for LiP04 packs?

Rich
Yes, there's two part changes, one of the resistor arrays, and then the lower voltage TC54 detector chip is used.

-- Gary
by GGoodrum
Nov 26 2011 8:19pm
Forum: Battery Technology
Topic: 12s2p LiPo pack kit including 12-channel BMS "Lite" Board
Replies: 168
Views: 25299

Re: 12s2p LiPo pack kit including 12-channel BMS "Lite" Boar

Forgive my noobness here (and I have been reading this entire thread) but is the idea to shrink wrap the BMS boards with the LiPo packs still there? I'm assuming by calling them 'embedded' that this is still the case, but the boards look a little fragile and after spending the time and money gettin...
by GGoodrum
Nov 26 2011 7:34pm
Forum: Battery Technology
Topic: 12s2p LiPo pack kit including 12-channel BMS "Lite" Board
Replies: 168
Views: 25299

Re: 12s2p LiPo pack kit including 12-channel BMS "Lite" Boar

I'm sorry that I haven't posted much here, but I have been busy, nonetheless. :) I did have a delay for a week, or so, while I did a consulting project, but that is complete. Anyway, I'm ready to at least start offering full kits for the 6s and 8s Embedded BMS "Lite" boards and the standalone Zephyr...
by GGoodrum
Nov 09 2011 3:56pm
Forum: Battery Technology
Topic: 12s2p LiPo pack kit including 12-channel BMS "Lite" Board
Replies: 168
Views: 25299

Re: 12s2p LiPo pack kit including 12-channel BMS "Lite" Boar

Can I order 2 x 8S and CC kit please. This will be for a Headway 16S 16Ah Pack that has been messed about by 3 x BMS that have broke on me :) Will also order same for my Lipo set up later. Can you explain how this would be used with say a KP 8A charger that I use for my bikes? Would the charger + a...
by GGoodrum
Nov 08 2011 4:36pm
Forum: Battery Technology
Topic: 12s2p LiPo pack kit including 12-channel BMS "Lite" Board
Replies: 168
Views: 25299

Re: 12s2p LiPo pack kit including 12-channel BMS "Lite" Boar

Gary, Can I order a 3x6s + CC now and later add another 6s board later? Dont you a have a 12s2p ready with bats? Can you post pictures of it? Yes, you can easily do this. I have my 12s2p pack apart, at the moment, I'll post some pics of this, with the embedded boards, as soon as I can. I'm working ...
by GGoodrum
Nov 08 2011 3:18pm
Forum: Battery Technology
Topic: 12s2p LiPo pack kit including 12-channel BMS "Lite" Board
Replies: 168
Views: 25299

Re: 12s2p LiPo pack kit including 12-channel BMS "Lite" Boar

Okay, I think we are just about ready to go with these. I now have new boards, both in 6s and 8s versions. Testing is complete, and the resistor values we've been tweaking are dialed in now.These will be offered with three different options, PCBs-only, with a BOM and build instructions; a complete k...
by GGoodrum
Nov 08 2011 3:03pm
Forum: Battery Technology
Topic: 12s2p LiPo pack kit including 12-channel BMS "Lite" Board
Replies: 168
Views: 25299

Re: 12s2p LiPo pack kit including 12-channel BMS "Lite" Boar

i don't want to hijack that thread, but could someone answer me how that bms lite differs from the smart bms - in case you don't install the celllogs of course, and use it as a "normal" bms. this is no offense, but i'm quite new to all this and don't see much difference, and this is only $24. http:...
by GGoodrum
Oct 31 2011 4:37pm
Forum: Battery Technology
Topic: 12s2p LiPo pack kit including 12-channel BMS "Lite" Board
Replies: 168
Views: 25299

Re: 12s2p LiPo pack kit including 12-channel BMS "Lite" Boar

ambroseliao wrote:That's great news. When do you expect to have these available? :D

Ambrose
Early next week.
by GGoodrum
Oct 31 2011 3:56pm
Forum: Battery Technology
Topic: 12s2p LiPo pack kit including 12-channel BMS "Lite" Board
Replies: 168
Views: 25299

Re: 12s2p LiPo pack kit including 12-channel BMS "Lite" Boar

Here is what will be available first. It is the latest version of our Zephyr BMS "Lite" design, in an embeddable form. The PCB below shows both 4 x 6s4p and 2 x 8s4p boards per PCB and the new standalone charge controller, which goes in its own small box. These are complete BMS boards, not just LVC/...
by GGoodrum
Oct 30 2011 2:18pm
Forum: Battery Technology
Topic: "Zephyr" - Finally, the "v4" Fechter/Goodrum/Hecker BMS...
Replies: 951
Views: 123440

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

The videos look good. Seems like things are working like they should. :) Here's where we are with the layouts: 12-16-24-Channel Zephyr BMS-v4.4.9f.png As Richard said, we both felt having connectors was better and I really like how easy it is to make cables for MTA156 connectors, so that's what we w...
by GGoodrum
Oct 30 2011 1:27pm
Forum: E-Bike Non-hub Motor Drives
Topic: Thoughts on new drive system/s. What would you like?
Replies: 44
Views: 3924

Re: Thoughts on new drive system/s. What would you like?

How about a higher power friction drive? :)
by GGoodrum
Oct 23 2011 10:24am
Forum: Battery Technology
Topic: "Zephyr" - Finally, the "v4" Fechter/Goodrum/Hecker BMS...
Replies: 951
Views: 123440

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

4.4 is still the big daddy in terms of shunt current. 4.5 is designed at 500mA but generally runs a bit higher. For very large cells or large imbalances, 4.4 will have a speed advantage. Is 100Ah considered a big pack, I have a 5P 24S pack of A123 Prismatic Cells 20AH, should I go with the 4.4? Cou...
by GGoodrum
Oct 23 2011 10:15am
Forum: Battery Technology
Topic: "Zephyr" - Finally, the "v4" Fechter/Goodrum/Hecker BMS...
Replies: 951
Views: 123440

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

where is our steve jobs giving the release presentation? we should have bands playing and politicians with speeches. this is a really proud moment for you guys, it has been a pleasure to try to just understand and appreciate how far you guys have come in just a few years. congratulations of the hig...
by GGoodrum
Oct 22 2011 4:02pm
Forum: Battery Technology
Topic: "Zephyr" - Finally, the "v4" Fechter/Goodrum/Hecker BMS...
Replies: 951
Views: 123440

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

Here are some shots of the new Zephyr "Lite" embedded BMS 6s4p boards, along with the small separate Charge Controller unit: 12s LiPo Embedded BMS Lite-01.jpg Zephyr Charge Controller-02.jpg Zephyr Charge Controller-01.jpg 12s LiPo Embedded BMS Lite-02.jpg These boards are not just simple LVC/HVC bo...
by GGoodrum
Oct 22 2011 11:30am
Forum: E-Bike Non-hub Motor Drives
Topic: Luke's race bicycle of Doom 2.0
Replies: 121
Views: 15298

Re: Luke's race bicycle of Doom 2.0

Where exactly is this race, somewhere in So Cal? Anyway, all the best, Luke. Do us proud! :)

-- Gary
by GGoodrum
Oct 19 2011 12:31pm
Forum: Battery Technology
Topic: "Zephyr" - Finally, the "v4" Fechter/Goodrum/Hecker BMS...
Replies: 951
Views: 123440

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

Sounds good, with the Lipo version would we be able to have the option to ...well...here is my Lipo charging setup: I have 6 x 8S 5.8Ah Turnigy Lipo wired up for 16S 3P with the balance leads all wired up in parallel for simple balancing. I charge using a Kingpan standard 12A but adjusted to 63.4V ...
by GGoodrum
Oct 18 2011 1:32pm
Forum: Battery Technology
Topic: "Zephyr" - Finally, the "v4" Fechter/Goodrum/Hecker BMS...
Replies: 951
Views: 123440

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

Sorry for the delays. :) I agree, we need a better way to get to the latest info. I will either edit the first post, or we'll start a new thread for the new version. What is different about this new version, which we will call v4.5, is that it has a new/simpler control scheme for determining end-of-...
by GGoodrum
Oct 15 2011 11:09am
Forum: Battery Technology
Topic: So... meanwells... have you heard of these?
Replies: 15
Views: 1355

Re: So... meanwells... have you heard of these?

Not exactly: If the charger is removed, the BMS would then drain down the high cell(s), but it cannot then top-off the still-low cells that were below the HVC. If the BMS is designed so that it does not use an HVC, but instead depends on waiting for all cells to be shunting before it cuts off, then...