markz
100 TW
Whats the deal with my #1 choice - Sony Konion US18650VTC4 compared to #2 choice 25R and #3 choice HE2?
LiFePO4 cells, where to buy?
- Thread starter markz
- Start date
markz
100 TW
Its going to take some time for me to wrap my head around this hybrid idea.
I have been reading a few forums now on it.
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I ended up buying these........
a123 packs 12S8P 96cells - ANR26650M1A - High Power Lithium Ion
Nominal capacity and voltage 2.3 Ah, 3.3 V
Im configuring most likely into 72.6V 8Ah (22S4P) for my Lyen 18fet, but might consider 60V 10Ah or 48V 12Ah with a Greentime Controller for more range.
I got my eyes on this website too http://osn.en.alibaba.com/productlist.html for my next pack. Confusing website, lots of overlap products.
So at 3.8V fully charged = 83.6V, so I buy a "20S - 72V - (84CV) - LiFePO4" charger?
Even tho im using 22, I got to look at voltage right.
Heres the spec sheet
http://wamtechnik.pl/files/specs/789.pdf
Charge them up to 3.8V(2.3Ah Capacity) and discharge to 2.75-3V (-2.1Ah) judging by the graph?
These cells are 30C = 70Acont, 50C = 120Amax-pulse, but the pack in 22S4P form, would deliver 280Acont (30C) and 480Amax (50C) on paper.
Doing the math am I correct in assuming the C-rate per cell I'd be using is
65Amax/4P = 16.25Amax per parallel string - 65A max set by my Cycle Analyst
16.25Amax/22S = 0.74Amax per cell in each series string
0.74A/70A x 30C = 0.32Cmax per cell
So with my 65A Lyen 18fet, and my CA to limit things, I believe my riding style will put me at around 32.5A average (Just to make it easy, thats 1/2 of 65A) and I will max it at 65A. So thats 0.16C(cont.) and 0.32C(max-pulse)
*************************Tab Welder Needed
I have been reading a few forums now on it.
------------------------------------------------------------------------------------------------------
I ended up buying these........
a123 packs 12S8P 96cells - ANR26650M1A - High Power Lithium Ion
Nominal capacity and voltage 2.3 Ah, 3.3 V
Im configuring most likely into 72.6V 8Ah (22S4P) for my Lyen 18fet, but might consider 60V 10Ah or 48V 12Ah with a Greentime Controller for more range.
I got my eyes on this website too http://osn.en.alibaba.com/productlist.html for my next pack. Confusing website, lots of overlap products.
So at 3.8V fully charged = 83.6V, so I buy a "20S - 72V - (84CV) - LiFePO4" charger?
Even tho im using 22, I got to look at voltage right.
Heres the spec sheet
http://wamtechnik.pl/files/specs/789.pdf
Charge them up to 3.8V(2.3Ah Capacity) and discharge to 2.75-3V (-2.1Ah) judging by the graph?
These cells are 30C = 70Acont, 50C = 120Amax-pulse, but the pack in 22S4P form, would deliver 280Acont (30C) and 480Amax (50C) on paper.
Doing the math am I correct in assuming the C-rate per cell I'd be using is
65Amax/4P = 16.25Amax per parallel string - 65A max set by my Cycle Analyst
16.25Amax/22S = 0.74Amax per cell in each series string
0.74A/70A x 30C = 0.32Cmax per cell
So with my 65A Lyen 18fet, and my CA to limit things, I believe my riding style will put me at around 32.5A average (Just to make it easy, thats 1/2 of 65A) and I will max it at 65A. So thats 0.16C(cont.) and 0.32C(max-pulse)
*************************Tab Welder Needed
markz
100 TW
I edited it, sorry
On a per cell basis its actually quite low
0.16C(cont.) = 32.5Acont
and 0.32C(max-pulse) = 65Amax-pulse
OK so 3.6Vmax - 3.15Vmin
And for Mean Well, any MW, or one that is CC/CV
How do I tell which MW are CC/CV. I have looked at a lot of MW spec sheets from www.mouser.com
I have read a lot on the *Dang forgot the term* The grounding issue of serial PSU's.
Floating Grounds etc.
Can I use my iMax b8+ for balancing LiFePO4? I know its real slow.
This one is from b6
[youtube]watch?v=ePrfh8QqzIY[/youtube]
B8+ but title says b6
[youtube]watch?v=Ssxh-hPefek[/youtube]
I realized the simple mistake and changed it.
On a per cell basis its actually quite low
0.16C(cont.) = 32.5Acont
and 0.32C(max-pulse) = 65Amax-pulse
OK so 3.6Vmax - 3.15Vmin
And for Mean Well, any MW, or one that is CC/CV
How do I tell which MW are CC/CV. I have looked at a lot of MW spec sheets from www.mouser.com
I have read a lot on the *Dang forgot the term* The grounding issue of serial PSU's.
Floating Grounds etc.
Can I use my iMax b8+ for balancing LiFePO4? I know its real slow.
This one is from b6
[youtube]watch?v=ePrfh8QqzIY[/youtube]
B8+ but title says b6
[youtube]watch?v=Ssxh-hPefek[/youtube]
999zip999
100 TW
Quit thinking of a magic battery that you found or invented for the first time.
You need a premade plug and play battery with bms and charger all from same supplier. Batteries are hard enough to buy a good one. Hybrid battery come on. That's about 3 years down the road for you. First get your hybrid scooter motor, controller ebike working and it's buds worked out. With a good working battery so that part wouldn't be a problem. Must people start with a 1,200 ~2,000 watt bike and battery not a 5,000 watt monster.
Get a ebike battery jar and everyday put money in it for a battery. Nobody wants to spend the money on a battery. You are not going to find it in a dumpster behind a computer store. Plus that 65amp controller demands a very special battery which means money. Sorry.
You need a premade plug and play battery with bms and charger all from same supplier. Batteries are hard enough to buy a good one. Hybrid battery come on. That's about 3 years down the road for you. First get your hybrid scooter motor, controller ebike working and it's buds worked out. With a good working battery so that part wouldn't be a problem. Must people start with a 1,200 ~2,000 watt bike and battery not a 5,000 watt monster.
Get a ebike battery jar and everyday put money in it for a battery. Nobody wants to spend the money on a battery. You are not going to find it in a dumpster behind a computer store. Plus that 65amp controller demands a very special battery which means money. Sorry.
B6 is too slow and has low tolerances. You should really use proper bms and proper charger.
V min is not 3.15, where did you even find that lol
It's 2.5 V, but lowest allowed is 2 V.
For meanwell supllies, open the datesheet, and in protection row, you should read constant current. Like this:
Best option are hlg series, those are led drivers, high efficiency, no fan, adjustable current and voltage, and models with large voltage range. But they are expensive.
I'm using meanwell copy of ebay, it's something like this:
http://www.ebay.com/itm/48V-7-3A-350W-Regulated-Switching-Power-Supply-For-CNC-CCTV-LED-Devices-/301220660600?pt=LH_DefaultDomain_0&hash=item4622268578
But you need to do a little mode to set correct current limit.
After lot of thought, I came to conclusion that these are best bang for buck once you take everything into consideration:
http://www.aliexpress.com/store/group/Lithium-Lipo-LiFePO4-Charger/313864_210769759.html
V min is not 3.15, where did you even find that lol
It's 2.5 V, but lowest allowed is 2 V. For meanwell supllies, open the datesheet, and in protection row, you should read constant current. Like this:
Best option are hlg series, those are led drivers, high efficiency, no fan, adjustable current and voltage, and models with large voltage range. But they are expensive.
I'm using meanwell copy of ebay, it's something like this:
http://www.ebay.com/itm/48V-7-3A-350W-Regulated-Switching-Power-Supply-For-CNC-CCTV-LED-Devices-/301220660600?pt=LH_DefaultDomain_0&hash=item4622268578
But you need to do a little mode to set correct current limit.
After lot of thought, I came to conclusion that these are best bang for buck once you take everything into consideration:
http://www.aliexpress.com/store/group/Lithium-Lipo-LiFePO4-Charger/313864_210769759.html
markz
100 TW
The graph, for 1A discharge, where on that curve is safest level of discharge and longevity integrity? 3V?
As I said max I be running is 1A per cell.
riba - Yes Greentime seems like good value for charger.
While I am waiting for it to come, I can use my iMax b8+.
Couple issues I see, as I am going throught the options.
LiFe V.Type is 3.3V
LiIo V. Type is 3.6V
All can go up to 8S.
As I said max I be running is 1A per cell.
riba - Yes Greentime seems like good value for charger.
While I am waiting for it to come, I can use my iMax b8+.
Couple issues I see, as I am going throught the options.
LiFe V.Type is 3.3V
LiIo V. Type is 3.6V
All can go up to 8S.
I also have B8+, life option is fine.
If you are going to be running 1C, 3 V might be fine as LVC, but you should still use 2.5 V, because of other conditions, like winter, safety, pulses, etc. You should monitor your Ah discharge and cut off based on that with lifepo4, since you can't know SOC based on voltage, like you can with li-ion.
If you are going to be running 1C, 3 V might be fine as LVC, but you should still use 2.5 V, because of other conditions, like winter, safety, pulses, etc. You should monitor your Ah discharge and cut off based on that with lifepo4, since you can't know SOC based on voltage, like you can with li-ion.
markz
100 TW
3.6V LiIon is bad because of the charging curve/characteristics?
markz
100 TW
Ah yessssssss forgot about that "Nominal Voltage"
I shoulda known!
I shoulda known!
999zip999
100 TW
Lifepo4 at 2.8 lvc is fine as little is left in the cell after that it will race down fast under load. And keep going down, they won't know to by themselves to stop. Best to store battery experiments in an old barbeque. Know what your playing with.
markz
100 TW
I need a LiFePO4 BMS.
Simple818
100 W
Just get 25rs. If you want 65a. Have 7 parallel strings and whatever series you want. 7p will get you 65a no problem with very low voltage sag
LockH
1 PW
Alternative scenario to LiFePO4 here:
http://endless-sphere.com/forums/viewtopic.php?f=14&t=27750
:wink:
http://endless-sphere.com/forums/viewtopic.php?f=14&t=27750
:wink:
