GGoodrum
1 MW
jeffkay said:
I don't have one from you, I don't think. Can you resend it?
Even Newer 4 to 24-cell Battery Management System (BMS)
- Thread starter GGoodrum
- Start date
I don't have one from you, I don't think. Can you resend it?
karma
10 kW
do you have a link to your website, i somehow lost it 
GGoodrum
1 MW
RealPeterPan
10 mW
Well done Lads!
Gary, Bob mentioned at the beginning of this tread you are toying with the idea of selling the BMS together with LifeBatt Packs.
As Bob is out of the lifebatt business is anyone of you still in contact with them and is the idea still in the back of your minds?
Regards Sven
EDIT:
Or a customized "Solderless Construction Kit" 16s4p or something like that without the LVC.
Gary, Bob mentioned at the beginning of this tread you are toying with the idea of selling the BMS together with LifeBatt Packs.
As Bob is out of the lifebatt business is anyone of you still in contact with them and is the idea still in the back of your minds?
Regards Sven
EDIT:
Or a customized "Solderless Construction Kit" 16s4p or something like that without the LVC.
GGoodrum
1 MW
RealPeterPan said:
No, I'm done with LiFeBatt. The PSI cells they use in their HPS packs are better than anything else out there I've found, except for a123 cells, but getting them through LiFeBatt is not a option. Many, such as ypedal here, I'm told, are geting them directly from PSI now, but I'm not sure.
Not sure what you mean about solderless kits. I am going to be doing a new solderless kit for the a123s, and for other 26mm diameter LiFePO4 cells, that would have a full BMS capabiity for each 4s4p "stick" but to fit that form factor I had to split the LVC and CMS functions into two small boards that will be stacked together. I might look at what it would take, though, to maybe do a variant that might use an 8, 12 or 16 channel variant of the board, as the top of a pack that has all the cells side-by-side, in maybe something like a 4 wide by 8/12/16 cells long. This could be one, or two cells high. Anyway, I'm always looking for easier ways to build a123-based packs.
-- Gary
Ypedal
100 TW
GGoodrum said:
word spreads fast lol.. but yes.. i'm testing the waters.. will let you know how it works out.
JavierCentenera
1 µW
Ggoodrum Hi from Spain...We are in the Business for Electric Scooters and We would like to test new BMS for LIFEPO4 Batts 20-cell...Should be avalaible from TPPacks? We would like to received quotations for productions batchs of 100, 200, 300 Units ...
GGoodrum
1 MW
JavierCentenera said:
Send me an email (ggoodrum@tppacks.com), and let me know more details about your requirement. What I'm looking for is what size pack are you planning to use (i.e. -- How many Ah?), and what sort of charger are you planning to use?
-- Gary
RealPeterPan
10 mW
GGoodrum said:RealPeterPan said:
No, I'm done with LiFeBatt. The PSI cells they use in their HPS packs are better than anything else out there I've found, except for a123 cells, but getting them through LiFeBatt is not a option. Many, such as ypedal here, I'm told, are geting them directly from PSI now, but I'm not sure.
Not sure what you mean about solderless kits. I am going to be doing a new solderless kit for the a123s, and for other 26mm diameter LiFePO4 cells, that would have a full BMS capabiity for each 4s4p "stick" but to fit that form factor I had to split the LVC and CMS functions into two small boards that will be stacked together. I might look at what it would take, though, to maybe do a variant that might use an 8, 12 or 16 channel variant of the board, as the top of a pack that has all the cells side-by-side, in maybe something like a 4 wide by 8/12/16 cells long. This could be one, or two cells high. Anyway, I'm always looking for easier ways to build a123-based packs.
-- Gary
Well I just copy and paste the name from your website.
But your thoughts of 4 wide by 8/12/16 cells long sound good.
Pair it with the 16 cell bms and i can start to buy dewalt packs
Is there a chance that this will appear on you website soon?
Because all this small things are really rare here in europe so as bigger the package of what I get in a row as better for my project.
Even if I spend the next few weeks after purchasing a package in my garage soldering the BMS or things like that, at least I´m working on it and not waiting on 100 different parts to arrive.
PS would it be easy for you to just change the top part with the LVC circuit or just leave it blanc so i could just wire the 4 groups on a plug and stic them together with 4 other packs on the 16s board?
Regards Sven
Ggoodrum, you obviously won't have surplus time these days, but it sure would be helpful if your site allowed back-ordering. I, for one, would love to be able to simply place my order and let you fill it whenever you get the stock in.
It would also give you a better idea of how many PCB's and parts to order at a time.
Maybe not a realistic suggestion given other circumstances and goals, but it sure would be nice if your site allowed it.
Regardless, Thanks for providing such an open and well thought out product for the community! I look forward to being able to place my order.
It would also give you a better idea of how many PCB's and parts to order at a time.
Maybe not a realistic suggestion given other circumstances and goals, but it sure would be nice if your site allowed it.
Regardless, Thanks for providing such an open and well thought out product for the community! I look forward to being able to place my order.
JavierCentenera said:
Dang, my soldering iron will wear out.
Go Gary!
GGoodrum
1 MW
tre4 said:
I just need a couple days to get all the kits out that have been ordered, and then I'll re-enable the site. I've got more parts coming by Friday.
-- Gary
iconoclast
1 mW
Gary, will the re-order boards have the updated transistor layout?
GGoodrum
1 MW
iconoclast said:
Yes, but so do the first kits. I did new boards last Friday, They show up here in the morning.
magudaman
10 kW
I know the design stage is really pretty much complete but it would be really cool to be able to throw larger shunt resistors on the board and have the option to kick a fan on when balancing starts. What is the limitation of the shunt resistor current, the small fets up the line? Do you have the part list so I could see how much it would cost me to do a board only setup?
GGoodrum
1 MW
magudaman said:
Why do you think you needsom much balancing current? Unless you've got 200Ah packs with cells that just can't stay anywhere near close to each other, I can't imagine why 1/2A per channel is not sufficient.
shinyballs
1 kW
For 22 cells, can I use the ready-made LVC and lvc/bms kit, connected together for balancing & charging? if yes, how is it wired/configured?
PJD
100 W
This question was answered a couple pages back:
http://endless-sphere.com/forums/viewtopic.php?f=14&t=5416&st=0&sk=t&sd=a&start=150
magudaman said:
The limitation on the shunt current is the dissipation of the resistor and the dissipation of the transistor turning it on. Since the shunt transistor is running linear, it needs to throw off quite a bit of heat. According to Randomly, this would be somewhere about 25% of the maximum resistor dissipation (I trust his math). This means if you want to a higher current, the transistor will need some kind of heatsink.
I agree with Gary, though. Unless your batteries are way out of whack or you're running 100+ah packs, it will balance very quickly at the lower current. Most of the charge is in before the thing goes into throttling, so only the last few percent will be at the lower rate.
PJD
100 W
Gary,
Are you sending confirmations when the orders go out? Thanks!
Are you sending confirmations when the orders go out? Thanks!
GGoodrum
1 MW
PJD said:
I'm hoping to get all the orders out today. I started a new consulting job this week, and have been tied up pretty much day and night, at their facility. As soon as I get these out, I will re-enable the site for another batch, but not before, sorry.
PJD
100 W
Gary,
Don't want to sound pushy, but are the first batch of kits out?
Anyone get theirs yet?
Don't want to sound pushy, but are the first batch of kits out?
Anyone get theirs yet?
GGoodrum
1 MW
PJD said:
I am so sorry for the delay. This new job has just had me swamped for the last week, including the weekend. I don't get home before about 9 or 10, and I've just been too wiped out to do much with the kits, more than adding a few more parts. It is easier to bag/label all the parts for all the kits, so I'm afraid none are complete, so none have gone out yet. It is a LOT more labor than I thought it would be, but I still feel I'm just one good day away from getting all of them out the door. The immediate crisis I'm dealing with at the job has to be complete by tomorrow, so I know I will have this weekend to get these out, and maybe start putting together the next batch. For the latter, I'm not going to enable them on the website until I actually have kits put together.
Again, I apologise for the delay, and I will totally understand if anybody wants to cancel their order, and get their money back. Just let me know.
-- Gary
Tom_D
100 mW
GGoodrum said:
Hey Gary,
To give you some idea of the number of kits to put together for the next run, here is the START of an informal list:
I would like to order:
(2) 16 channel BMS kits with the 15 Ohm/2W shunts.
Thanks for hanging in there.
-- Tom_D
OTHER FOLKS: Let him know by posting >>>> That way, Gary can make up an efficient run.
lepton
1 W
I need two (2) 16 channel BMS kits with the 6.8 ohm / 5W resistors
Thanks!
Thanks!
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