latecurtis
100 MW
Thanks.
I just want to keep living the dream. Not turn it into a nightmare.
LC. out
I just want to keep living the dream. Not turn it into a nightmare.
LC. out
kuz said:Don't despair, LC. Keep the lid on though.
latecurtis said:I will get to the bottom of the big mystery of why my new 26650 cells are not even close to measured capacity.
It is not simple or straightforward.
I will find out though. It is just a matter of time.
Thanks.
LC. out.
One of these would be cool to build or buy a tad pole trike with 2 wheels in the front and one wheel in the back.
You could pick a lot of metal and bottles to cash in at the recycler it would supplement the monthly disability check if you want to keep active labor efforts and status under the table.
I like the option of taking the sidewalk when there is a lot of cars. I like 20" e bikes as can put my feet flat on the ground if an emergency. All the e bikes I have flipped or tipped over since I was a kid were 26" or 700c. I always seem to land on my right shoulder and extensive rotator cuff damage.
I will need to take it easy. I have to start walking a lot more or wont be around much longer. Type 2 diabetes is killing me. I need to be like 190 or 180. NOT 230+ Pedaling is limited as cant bend my knee that much. Was supposed to have a total knee replacement in 2014. I can walk because I don't have to bend the knee very much. Deep snow hurts a lot though.
You must be kinda of short, 26" bicycles come in different heights, I like 19" size or xxl 20"+ but there are 17" which is a common size for 26" bicycles.
Use a B6 balance charger to run a full LiFe discharge\charge cycle. Note start and end voltages for each bank, Ah discharge and charge (not balance charge) Ah and charged voltages of each bank. (monitor bank voltages!)
Poor-inaccurate capacity "percentage" meter - still plenty of Ah left?
Note start and end voltages for each bank, Ah discharge and charge (not balance charge) Ah and charged voltages of each bank. (monitor bank voltages!)
Low original capacity;
calab said:When I see the cool adults riding bmx bikes or adult bums riding bmx bikes I kind of giggle inside but I think chalo rode bmx bikes or still does.
Here's my 29er e-bike, which is made roomier and more robust by means of various BMX bits.
Stop trying to make a simple test so complex!latecurtis said:DrkAngel said:Use a B6 balance charger to run a full LiFe discharge\charge cycle. Note start and end voltages for each bank, Ah discharge and charge (not balance charge) Ah and charged voltages of each bank. (monitor bank voltages!)
DrkAngel said:Poor-inaccurate capacity "percentage" meter - still plenty of Ah left?
DrkAngel said:Note start and end voltages for each bank, Ah discharge and charge (not balance charge) Ah and charged voltages of each bank. (monitor bank voltages!)
Ok.
I read that carefully three times and thought about it. I do not have a B6 charger but a Tenergy 400W Mega charger Dan sent me.
It only displays the voltage of each cell bank when charging in balance mode and you said my 5 in 1 meter could be inaccurate.
That is ok though as I have the solution. I have that 6S balance extension wire which goes to that wood strip with 7 bolts. I can charge and discharge at 1S for each 5P cell bank. It will take longer but I have plenty of time on my hands.
I will be able to run a capacity test on both 6S packs and the 3S pack all 5P one cell bank at a time.
The guy I talked to on the phone today from Michigan said that I could check for cold solder joints by running a load and touching each joint. If the joint gets hot that is a sure sign it is a bad/cold solder joint. I think I might try that as well.
I know they make heat detectors which show a red color for hot spots. This is the kind of scientific stuff I really like. It may even be possible to replace up to three cell banks if I order one more box of 16 cells for $34.
It may or may not be worth doing depending on the results of the tests. I have three people now who think.
DrkAngel said:Low original capacity;
Could be a factor.
I tried to contact K2 energy to give them the numbers so I could find out when the cells were manufactured so I could know how long they were on a shelf. I was told that Lion - 18650 cells lose a significant amount of capacity after 5 years. However nobody really has any data regarding LIFEPO4 cells as a totally different chemistry.
I will start testing tomorrow one cell bank at a time. I will then start looking for that heat tester. Not sure what it is called. Infra red something ? I even heard that there is an app. for it on a smart phone. I have android. Not sure. I will order a tester however as can also test my wiring , controller and even motor for heat. It would be an awesome tool for my e bike work shop if I can get one at a reasonable price.
Thanks for posting.
LC. out.
DrkAngel said:I really do hate repeating myself over and over and over, but,
Possible LiFePO₄ problems, from reported symptoms and construction details:
...
Cold solder joints causing deep voltage sag.
Low quality 16ga "speaker wire", causing deep voltage sag
DrkAngel said:"With battery under load (1C is optimal for testing IR),
Test voltage of clean contact metal of individual cells.
Compare to voltage from tops of solder gobs.
Compare to voltage at ends of speaker wire."
DrkAngel said:Most all B6 (Battery 6) balance chargers will display cell voltages during all charge or discharge modes, as long as the balance wires are connected. (A basic function! = prevents over charge or discharge of any cell)
You want to compare cell voltages during charge and discharge!
DrkAngel said:I really do hate repeating myself over and over and over, but,
Possible LiFePO₄ problems, from reported symptoms and construction details:
...
Cold solder joints causing deep voltage sag.
Low quality 16ga "speaker wire", causing deep voltage sag
If you want to check resistance ...
I will also repeat! = Last time!!!
DrkAngel said:"With battery under load (1C is optimal for testing IR),
Test voltage of clean contact metal of individual cells.
Compare to voltage from tops of solder gobs.
Compare to voltage at ends of speaker wire."
Brand: K2
Model: LFP26650E
Capacity: 3800mah
Nominal Voltage: 3.2
Fully Charged Voltage: 3.65 (recommended), 4.1 (maximum)
Fully Discharged Voltage: 2.5 (recommended), 2.0 (maximum)
Continuous Discharge (A): 12
Pulse 30 Seconds Discharge (A): 28
Charge Current (A): 3.8
latecurtis said:This is going to take a long time.
"With battery under load (1C is optimal for testing IR),
Test voltage of clean contact metal of individual cells.
Compare to voltage from tops of solder gobs.
Compare to voltage at ends of speaker wire."
Under "program"(?) or "settings", adjust capacity to 20Ah or off, adjust "time(r)" to 20hr or off. - For 19Ah battery. Charger shut off at 5000mAh 299.52 minutes, so capacity, not time is limiting setting, but check both settings. Amp discharge setting is adjusted at discharge window (typically).
Your balance charger is designed to charge\discharge LiFe at standard-rated voltages, so let it do it's thing if you want to compare actual capacity to oem rated.