diy solar

diy solar

12V 280Ah LiFePo4 battery Build and Test

I ordered a cheep capacity tester from one of the vendors on Aliexpress and have the same situation, stuck at newgistics in Los Angeles for the last 4 weeks.

  • Departed Shipping Partner Facility, USPS Awaiting Item
    2020-06-23 01:38:00 [LOS ANGELES,90040]

  • Inducted into Newgistics Network
    2020-06-20 12:36:02 [GMT-5]

  • Arrived Shipping Partner Facility, USPS Awaiting Item
    2020-06-20 10:36:00 [LOS ANGELES,90040]
Its clearly lost but I'll need to wait until they officially declare it as such i guess - 90 days or something like that. I opened a dispute and they just told me to wait for it. I just bought one from amazon in the meantime I didn't want to wait to test my cells.


Haugen said:
My BMS is still sitting in California and I have no idea why. 3 weeks at some mystery partner that is supposed to get it to the post office. Never ordering through AliExpress again. Alibaba worked just fine, but I'm starting my 3rd month waiting for the delivery.
Click to expand...
 
rmcrowe said:
I ordered a cheep capacity tester from one of the vendors on Aliexpress and have the same situation, stuck at newgistics in Los Angeles for the last 4 weeks.

  • Departed Shipping Partner Facility, USPS Awaiting Item
    2020-06-23 01:38:00 [LOS ANGELES,90040]

  • Inducted into Newgistics Network
    2020-06-20 12:36:02 [GMT-5]

  • Arrived Shipping Partner Facility, USPS Awaiting Item
    2020-06-20 10:36:00 [LOS ANGELES,90040]
Its clearly lost but I'll need to wait until they officially declare it as such i guess - 90 days or something like that. I opened a dispute and they just told me to wait for it. I just bought one from amazon in the meantime I didn't want to wait to test my cells.
Click to expand...
After seeing your post, I thought about the shipping partner. Mine said "INTERNATIONAL BRIDGE", so I never thought that it was a company I could seek information from. I searched for it and lo and behold they have their own tracking system.
I ran my number and got the whole travel story that has not been available through AliExpress tracking, Track17, nor USPS.
There are huge gaps where it just sat in multiple places. It took a month to go from one warehouse to another in Shenzen.
Looks like it finally left the warehouse in San Bruno for the post office yesterday. We shall see...

I filed disputes for all orders before they expired. Of course they denied them and said to pay more attention to my postal service.
Had they provided information on what service to track through, I may have been less upset. Not giving a damn about whether your customers receive what they paid for and closing their ability to file a claim before they receive the item is not a business model I can support.

2020-07-21 16:30:58
Departed warehouse
SAN BRUNO, CA, 94066, USA
info_3-512.png


2020-07-16 11:11:10
Received at warehouse
SAN BRUNO, CA, 94066, USA
info_3-512.png


2020-07-01 23:40:00
Arrived into the US
OAKLAND, CA, 94502, USA
info_3-512.png


2020-06-04 21:11:51
Departed warehouse
SHENZHEN, GUANGDONG, 518048, CHN
info_3-512.png


2020-06-04 14:07:07
Received at warehouse
SHENZHEN, GUANGDONG, 518048, CHN
info_3-512.png


2020-06-04 12:30:03
Received at warehouse
SHENZHEN, GUANGDONG, 518048, CHN
info_3-512.png


2020-06-04 07:03:05
Received at warehouse
SHENZHEN, GUANGDONG, 518048, CHN
info_3-512.png


2020-05-08 18:56:52.98
Departed Partner Warehouse
SHENZHEN, GUANGDONG, 511700, CHN
info_3-512.png


2020-05-03 07:48:18
Received data
 
When ordering from Aliexpress, toggle "ship from" and it will show if you product can ship from warehouse in United States 5-7 days usually. Lotsa people ordering online due to panda demic.
 
https://photos.google.com/direct/AF.../AF1QipMt1yogn2WyEpMy98X_mYBNrYlR7Vlhjz1BGtU0 This is my setup so far, just enclosed the batteries with wood and corner bars with hose clamp in middle to put pressure on wood slats, most pressure is on the ends inward, made the sides shorter so pressure from ends inward, total weight with case is 50lbs, case weighs 15 lbs with 66lb capacity. Waiting for copper to complete, as I need 3x 4" length and TR16 current guage. Daly 150a(separate) will be screwed into side board on backside.
 
Pi3.14 said:
When ordering from Aliexpress, toggle "ship from" and it will show if you product can ship from warehouse in United States 5-7 days usually. Lotsa people ordering online due to panda demic.
Click to expand...
There was no such option at the stores I used.
I have seen Italy and Russia listed, but I have yet to see something on there I can have shipped from the US.
 
Here is snapshot, look at top toggle United states and you'll see the BMS that ships from USA. 1595504907235.png
 
FINALLY!!!! My BMS arrived today!
Only 86 days in transit. Jeeeeez! I'm exhausted from checking the tracking numbers.
There is one corner that tore a hole in the padded envelope they shipped it in. The temperature sensor wires look pretty beat up. Other than that, it seems in fairly good condition.
The packaging was not ESD protective, so hopefully it will work.
Contractors should be here any minute, so no time tonight to tinker.
I'll post pics of how I deal with the multiple wires coming off the PWB to the crimps.
 

Attachments

  • 20200727_173237.jpg
    20200727_173237.jpg
    67.9 KB · Views: 53
  • 20200727_174011.jpg
    20200727_174011.jpg
    92.4 KB · Views: 52
That seems like only 120a 4s bms with BT inputs for settings. Wonder if it has active balancing. The Daly 250a smart BMS only for 5s and above for imputs so a no go for 4s. My 150a Daly apparently only balances above 3.6volts.
 
Just to add from the back page about dissimilar metal corrosion. I usually use this chart or another I can't find right now to see if I am going to have a problem. I've seen some of this corrosion happen so fast that I always check now.

Galvanic-Corrosion_2.png
 
Pi3.14 said:
That seems like only 120a 4s bms with BT inputs for settings. Wonder if it has active balancing.
Click to expand...
It has passive balancing and I'm ok with that. Hopefully active balancing will become the standard later, but this early in the life of lithium battery building, it makes sense that passive has been the method for the low cost BMS makers. When one maker breaks through with a cheap active balancer, the rest will follow rather than lose all their sales.
 
No.15 said:
Just to add from the back page about dissimilar metal corrosion. I usually use this chart or another I can't find right now to see if I am going to have a problem. I've seen some of this corrosion happen so fast that I always check now.

View attachment 18685
Click to expand...
That's a pretty good noble metal chart. Usually of you are within one step in the table, there is not a lot of risk.
The reason I harp on it is because aluminum and copper are so far separated on the table and the lithium batteries have such a long life cycle. It's a perfect recipe for neglected terminals to slowly corrode if not maintained.
I know that I get complacent sometimes, so I'm building mine to be free of corrosion long term. Aluminum bolts, and oversized aluminum bus bars on aluminum terminals with lubricant. The transition to copper will be the lugs going to the BMS and battery.
Easy to spot degradation there.
 
Just got this message about Daly 250ah smart Bms, I didn't think parameters where adjustable for 4s, but he affirmed it has been changed and now can be adjustable for 5s and below, DALY250aRECIEPt.JPG
 
Pi3.14 said:
Just got this message about Daly 250ah smart Bms, I didn't think parameters where adjustable for 4s, but he affirmed it has been changed and now can be adjustable for 5s and below, View attachment 18709
Click to expand...
I only bought the 120A version because I wanted margin above my intended use. If the draw on my camper battery is more than 50A, it will be a really bad day. Just LED lights, fan, charge phone, and 12V fridge. Maybe play some music on the radio, but the purpose is for hunting trips to get away from it all.
 
Back on topic, I hooked up the BMS last night and it came on and the Bluetooth module connected right up. The app I got from the Play Store was the same as from the seller.
Screenshot_20200729-080259_Google Play Store.jpg
I found a newer version of the app on a different thread in the forum that works better and has more options.
Screenshot_20200729-080329_Samsung Experience Home.jpg
I'll go find the link and post it here.
I tried several other apps in the Play Store, but none of them would connect.
 
Go to post 18 of this thread for the link.
Great information about the BMS there
diysolarforum.com

Finally found a LiFePO4 BMS with Low-temp Charging Protection

Spent the last few days and tonight testing BMS: 1. The "new" daly LiFePO4 BMS (that states in the data sheet that it has low temp charging protection) does not have low temp charging protection. And yes, it has a temp sensor attached. This disappointed me big time. Video to come. 2. Next, I...
diysolarforum.com diysolarforum.com
 
Just ordered an 8-pack of those 280Ah cells; very excited. Should be here sometime "before September 1," supposedly.

Keep us posted on your progress!
 
First discharge of the battery using the BMS.
I'm using an old 1500W inverter running a ceramic heater. On low, it draws about 45A and on high, it will peak around 90A.
I ran it around 3 hours (mostly on low because I didn't want to stand watching it baking in the test room)
It's just a preliminary rig to prove that it is working and will handle my real life loads.
Next step is to combine the 3 cables on either side of the BMS into one each way and crimp on the big lug. (crimper arrives Friday) also cut the bus bars to size and shape to replace the cheapo ones that came with the cells.
Stay tuned!
 
Decided to stay up later and see if I can get past the knee while I work to get my datalogger to talk to my computer.
Software is being difficult and it's always a pain to get the serial port talking to the device.
Windows decided it needs an update, so watching the voltage slowly sink as it reboots.
Everything staying balanced as we sink towards 12V.
 
Used some screenshots with and without the load on to do the math for internal resistance.
Voltage drop with a 71A load was only about 40-50mV. That's about 5mOhms.
 
Great progress today! Things are finally coming together. I got home from work and, as expected, the battery was still charging. Was at 67%.
Getting the laptop to see the datalogger has been a struggle. I finally just ran every installer I could find on the disk then started running all the apps. The device finally showed up and within minutes, I configured the Voltage, current, and temperature and lit off a scan. I noticed that I had my sense leads to the shunt backward, so I stopped, reversed them and set up some scaling so that it displays the current accurately when reading across the 0.5mOhm shunt.
Charge is almost done.
This weekend I'll rework the BMS wires and post some pics.
After adding voltage monitoring wires to each cell, hopefully I can discharge and recharge before the hurricane gets here.
 
Alright, I took the BMS off the system to work on the wires. It really bothers me to have 3 separate wires to carry the current into and out of the BMS. Thus far, I was using just one wire and was able to pull 40A constantly and the wire was just warm.
I got into a little debate with someone on another thread about this. He insisted that when you change the gage of the wire you should always have a fuse. He insisted that each of the 6 lines should get a fuse because any one could fail and leave higher currents on the remaining wires. He's not wrong, but the fuses and fuse holders add so much complexity, cost, and failure opportunity that it's not really worth discussing.
Anyway, that's a long introduction to how I'm dealing with this issue. The rest I'll say with pictures.
Enjoy!
20200731_161713.jpg20200731_161804.jpg20200731_162029.jpg20200731_162220.jpg20200731_162332.jpg20200731_162513.jpg20200731_162905.jpg20200731_170830.jpg
 
the 6m screw terminal on 280ah battery is small, have you noticed the neg terminal screw gets real hot at 66amps, I wonder if the small terminal limits amp discharge amount as it gets real hot.BATTPIC.jpgBAT3.jpgBAT2.jpg
 
Gotcha, the blue from BMS is on bottom, but the TR16(black on top). Also checking cell resistance. One of my cells seems to discharge faster. Got to 2.79 others were at 3.14 .3.22,3.22. Cleaned and switch 2 busbars (process of elimination). Charging up now and will balance and discharge again, hopefully didn't get a bad cell???
 
You must log in or register to reply here.

Similar threads

V
Finished my 12v 304ah battery build with heating
Replies
1
Views
402
Partimewages
Partimewages
X
EVE 280ah problem with 1 battery only?
2
Replies
26
Views
891
GXMnow
GXMnow
B
Battero Tech BT280 3.2V 280Ah LiFePO4 Cells - US$55.00 _ GobelPower.com
Replies
8
Views
1K
Skypower
S
K
Capacity test setup - campervan battery bank
Replies
2
Views
238
krishkrash
K
L
12V charger for 4S Lifepo4 battery (13.8V ? 14.6V ?)
Replies
11
Views
291
time2roll
T

diy solar

diy solar
Back
Top