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Old 02-26-2012, 08:41 AM   #105
_cy_ OP
Beastly Adventurer
Joined: Sep 2011
Location: Tulsa, Oklahoma
Oddometer: 6,407
Originally Posted by Anorak View Post
With your apparent focus on precision and accuracy, would you try to get the chemistry right? I'm pretty sure there is no "lithium iron cobalt cell". Lithium-cobalt is what is generically called lithium-ion. Is that what you mean? It appears that the lithium cobalt chemistry is what was causing the laptop fires but it was due to contaminates in the cathode.
ooppss... thanks for catching that... corrected... that's what I get for posting half asleep..
switching to LiFePO4 ... been avoiding using to due to all the different chemistry connected to li-ion batteries

here's a few of the different chemistry within li-ion batteries. to complicate thing further, all are constantly evolving. then add private labels like A123 Nanophosphate lithium ion batteries .... arrrggghhhh

1. lithium iron phosphate (LiFePO4) battery, also called LFP battery
2. lithium nickel manganese cobalt oxide (LiNiMnCoO2)
3. lithium manganese dioxide (LiMn2O4)
4. Lithium cobalt oxide (LiCoO2)

48f degree by 8:15am .. left G/S out all night. the 30f low never materialized
Shorai LFX21 AH (pb eq) has more than proven it's ability to start and operate R80G/S in temperatures to 40f degrees.

many more batteries to test with several more on the way. next up is Shorai 36 AH (pb eq)
besides additional reserve capacity and increased starting amps. 36 AH (pb eq) provides more headroom during charging.

G/S is equipped with a 400 watt high performance charging system by Motorrad Elektrik. 400watts/13.8v = 29 amps then subtract motorcycle's overhead (5amp) which is about 10 amps total with lights (55watt)

with higher output voltage regulator... measuring 22.5 amp to battery at 3k rpm with lights on.
to keep our LiFePO4 battery healthy Shorai recommends not to charge over 3C. which is figured on actual AH. So we should not subject Shorai 36 AH (pb eq) over 36amp charge load. a Shorai LFX21 AH (pb eq) max charge rate is 21 amps.

A123 26650 spec sheet recommends 4C fast charge rate to 80% DOD.

translated... if AH capacity of your li-ion battery is not large enough... your motorcycle charging system may charge your battery at too high amp rate.

R80G/S voltage regulator changed out to higher output 14.5v Motorrad Elektrik

_cy_ screwed with this post 03-24-2012 at 05:25 PM
_cy_ is offline   Reply With Quote