Search found 1436 matches

by deVries
Jul 28 2008 5:58pm
Forum: Battery Technology
Topic: Even Newer 4 to 24-cell Battery Management System (BMS)
Replies: 2168
Views: 279874

Re: Even Newer 16-cell Battery Management System (BMS)

Three more questions :D for you (please&thankyou)... 3.9v sounds too high, but they're in the business of selling batteries... ... :P From my point of view I want to charge as fast as possible without risking any damage to the cycle lifespan or reducing capacity... Is there an ideal AMP charge range...
by deVries
Jul 28 2008 3:05pm
Forum: Battery Technology
Topic: Even Newer 4 to 24-cell Battery Management System (BMS)
Replies: 2168
Views: 279874

Re: Even Newer 16-cell Battery Management System (BMS)

Assuming the batteries can handle it, what is the maximum charging current this BMS can handle? What is the limiting factor? Thanks! I was designing for 20 amps, but I don't have a test setup that can go that high yet. The limiting factor will be heating on the FET. If the FET runs too hot, it woul...
by deVries
Jul 27 2008 4:22pm
Forum: Battery Technology
Topic: Even Newer 4 to 24-cell Battery Management System (BMS)
Replies: 2168
Views: 279874

Re: Even Newer 16-cell Battery Management System (BMS)

1) Anyone have links to the best ideas for chargers or dc converters for this? For example: I want to use a total of 56 a123 DeWalt cells in a 4 parallel configuration. So it's a 14s4p set-up at the theoretical voltage of 14x3.65 = 51.1v So, I guess I would need at least a 50v DC converter that sho...
by deVries
Jul 26 2008 8:17pm
Forum: Battery Technology
Topic: Even Newer 4 to 24-cell Battery Management System (BMS)
Replies: 2168
Views: 279874

Re: Even Newer 16-cell Battery Management System (BMS)

4) It's my understanding that one circuit board will work with several identical parallel packs of x# up to 16 cell packs in x# of parallel packs. As I think Gary put it simply, the bucket (each parallel pack) simply overflows from charging one parallel pack to the next until the entire parallel se...
by deVries
Jul 23 2008 10:12pm
Forum: Battery Technology
Topic: Even Newer 4 to 24-cell Battery Management System (BMS)
Replies: 2168
Views: 279874

Re: Even Newer 16-cell Battery Management System (BMS)

So are you saying for around 90.00 kit to be aasembled you get both the cms and lvc combined in this bms kit Hopefully less than $90, but yes, that is correct. From your website: Unique "stick pack" construction technique groups four blocks of four paralleled cells, one block in front of the other,...
by deVries
Jul 23 2008 4:28pm
Forum: Battery Technology
Topic: Even Newer 4 to 24-cell Battery Management System (BMS)
Replies: 2168
Views: 279874

Re: Even Newer 16-cell Battery Management System (BMS)

Actually, the charger/supply just needs to be a few millivolts above the sum of the individual cutoff voltages. The cutoff voltages are a function of the voltage divider resistors, so you can adjust the number by changing these values, if you needed to. With the 180k/75k 1% resistors supplied, the ...
by deVries
Jul 22 2008 7:18pm
Forum: Battery Technology
Topic: Even Newer 4 to 24-cell Battery Management System (BMS)
Replies: 2168
Views: 279874

Re: Even Newer 16-cell Battery Management System (BMS)

So, when will the kits be available? And Price? Question: What is the price estimate to build a 48 volt 9-10ah pack w/charging & LVC protection kit? 1) How many DeWalt 36v packs will be needed to tear down? (Any extra cells left over for replacement-repair?) 2) Cost *estimate range* (if final price...
by deVries
Jul 22 2008 5:28pm
Forum: Battery Technology
Topic: Milwaukee 28v x2s w/BMS & Warranty VS DeWalt 36v in Parallel
Replies: 5
Views: 935

Re: Milwaukee 28v x2s w/BMS & Warranty VS DeWalt 36v in Parallel

Thanks for the feedback and posting your pretty-babies. Sweet. Definitely a way to go and make it easy rider too. Here's a Batman rider idea for y'all to critique... 8) Now for the comparison to a POOR MAN'S DeWALT IDEA with a Batman's Turbo Boost switch too... Mechanically and electrically, everyth...
by deVries
Jul 22 2008 2:48pm
Forum: Battery Technology
Topic: Milwaukee 28v x2s w/BMS & Warranty VS DeWalt 36v in Parallel
Replies: 5
Views: 935

Milwaukee 28v x2s w/BMS & Warranty VS DeWalt 36v in Parallel

I now have a bit (really, a lot!) of information overload and over-my-head reading I've been doing here since I found this ES-forum a few weeks ago, and I thank everyone for providing me with these challenges to understand just enough to know... I've got a long way to go... Rats! I wish I was an ele...
by deVries
Jul 16 2008 2:21am
Forum: E-Bike Technical
Topic: E-crazyman conroller upgrades and BMC hubs
Replies: 4
Views: 695

Re: E-crazyman conroller upgrades and BMC hubs

I'm trying to do the same thing with the Texas EV-BMC motor and need a controller... now. I want to run it at 48v w/LiPo. I don't need range, trips will be 6-12 miles RT, so I want to know if a 10ah battery will be enough for... Quick acceleration off the line or to avoid traffic dangers by accelera...
by deVries
Jul 14 2008 4:27pm
Forum: E-Bike General Discussion
Topic: Brushless Geared hubmotors: BIG list & details
Replies: 175
Views: 130492

Re: Brushless Geared hubmotors: definitive list & details

Doug at EV tech engineered and designed the geared hub motor over a period of many years. Too bad he didn't patent it, as now the manufacturers have sold his design to others who put their names on them. I have his hub on the rear of a bike and it is an 8 pound torque monster. One thing not mention...