
inkeeper77 wrote:I received my cells quickly after ordering- I got 17 packs. (51 individual cells) - I am only starting my build, but I am happy! They are genuine cells. A bit messy, since they are already in packs and I had tro break them apart, but they look like they will work great!



























TonyReynolds wrote:I figure if I run 4S3P (12 cells), that will get me 13.2 nominal with 6.9 Ah, about 91 Wh. At 80% DOD, that would get me about 2.9 hours of runtime for the headlamp.
1. What would I need for a charger and,
2. Would I need a BMS if I'm just running lighting, which is a steady current draw?

TonyReynolds wrote:I would like to order some of these for my eBike lighting, which is currently slated to be a single 25W 12VDC H3 halogen driving light.
I figure if I run 4S3P (12 cells), that will get me 13.2 nominal with 6.9 Ah, about 91 Wh. At 80% DOD, that would get me about 2.9 hours of runtime for the headlamp.
A couple things me stuck, as I'm I'm not a EE and I don't play one on TV:
1. What would I need for a charger and,
2. Would I need a BMS if I'm just running lighting, which is a steady current draw?
I could also do 16S1P (just 4 more cells) with a step-down dc-to-dc convertor to 12-14VDC, but I don't know whether that would get me any more runtime for the light, but it *would* give me extra Ah's as a "reserve" for my 52V 16S5P tringle battery if I used Andersons. I could simply unplug my main pack if I were to hit LVC on a ride and get a little more distance...
Thoughts?



teklektik wrote:Get a power strip and plug in four VoltPhreaks single cell chargers, skipping a socket in between for cooling. Make up a little connector for all four and you have a quickie balance charger - no BMS required, nothing needs to be disconnected. However, at only 2A charge current, your 3p pack will take about 3 hours to charge.
Importantly, even though it looks like there are common (+),(-) wires going to the same terminals in your pack from adjacent chargers, you really need to run separate wires right up to the cell terminals so each charger will not see voltages related to charging going on for its neighbors i.e. 8 pin connector, not 5.



TonyReynolds wrote:Hmmmm, I did find THIS:
http://shop.hidcountry.com/Motorcycle-HID-Kit-p/moto%20kit%20hdk1.htm
They don't say how many watts the burner uses, just the halogen wattage equivalent.


TonyReynolds wrote:Any thoughts about dc to dc conversion for 52V to 14V?
I apologize for hijacking the thread. Myaybe this gets you more bumps?







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