Big Battery 24v A123

[No.15]

I ordered 2 of them it took them about a week but they shipped it and ill be getting them soon.

Me to, ordered 2 and took a week to send. I should get mine today

 

[Deleted member 1888]

Me to, ordered 2 and took a week to send. I should get mine today

The shipper called me and told me it is delayed

 

[No.15]

The shipper called me and told me it is delayed

Mine are on the delivery truck. Anyone have recommendations for a charger for these?

 

[MrNatural22]

Mine are on the delivery truck. Anyone have recommendations for a charger for these?

Right now I'm using a Longwei 30v 10a switching power supply for shore charging.

DC Power Supply Variable,0-30 V / 0-10 A LW-K3010D Adjustable Switching Regulated Power Supply Digital,with Alligator Leads US Power Cord Used for Spectrophotometer and lab Equipment Repair: Amazon.com: Industrial & Scientific

DC Power Supply Variable,0-30 V / 0-10 A LW-K3010D Adjustable Switching Regulated Power Supply Digital,with Alligator Leads US Power Cord Used for Spectrophotometer and lab Equipment Repair: Amazon.com: Industrial & Scientific

www.amazon.com

 

[No.15]

Right now I'm using a Longwei 30v 10a switching power supply for shore charging.

DC Power Supply Variable,0-30 V / 0-10 A LW-K3010D Adjustable Switching Regulated Power Supply Digital,with Alligator Leads US Power Cord Used for Spectrophotometer and lab Equipment Repair: Amazon.com: Industrial & Scientific

DC Power Supply Variable,0-30 V / 0-10 A LW-K3010D Adjustable Switching Regulated Power Supply Digital,with Alligator Leads US Power Cord Used for Spectrophotometer and lab Equipment Repair: Amazon.com: Industrial & Scientific

www.amazon.com

Any good dc-dc chargers I can set and forget, or is this programmable?

 

[MrNatural22]

You can adjust the voltage o-30v and the current 0-10a The current will drop approaching your set voltage It is not a "set and forget" option.
It will maintain the set voltage until you turn off. You must watch it. Not a good idea to leave it connected at the charging voltage after battery is full.
Can't help you on dc-dc chargers, don't use one.

 

[No.15]

Got mine today. v = 26.315 What's the best way to measure individual cells? Can I just us the MM at each cell or do I have to walk the battey and do math?

Looks, good from here



Packing not the best, but not real bad at this point because I see it's double boxed



Double boxed



Opened, could have been packed better IMO. The battery had plenty of room to move, the packing was not tight.



Top cover



Side



Looks like some rust in the holes, not sure if it's from a cooling system or what.



Top with cover removed

 

[Deleted member 1888]

I just got my 2 24v BYD packs and GOOD GOD THEY ARE HEAVY! I had to take them up the stares one at a time with 2ppl just to get them inside. I did not think 200lbs would be that much of a pain, guess il lucky did not order 6 of them.

 

[MrNatural22]

I just got my 2 24v BYD packs and GOOD GOD THEY ARE HEAVY! I had to take them up the stares one at a time with 2ppl just to get them inside. I did not think 200lbs would be that much of a pain, guess il lucky did not order 6 of them.

WOW! ? 200lbs?
Time for a fork lift?

 

[Deleted member 1888]

WOW! ? 200lbs?
Time for a fork lift?

Yea I did not pay attention the the info on the batteries that stated they are 200lbs EACH! They were delivered tome on a semi truck, I know my neighbors were thinking WTF!

 

[MrNatural22]

Got mine today. v = 26.315 What's the best way to measure individual cells? Can I just us the MM at each cell or do I have to walk the battey and do math?

Looks, good from here

View attachment 18595

Packing not the best, but not real bad at this point because I see it's double boxed

View attachment 18596

Double boxed

View attachment 18597

Opened, could have been packed better IMO. The battery had plenty of room to move, the packing was not tight.

View attachment 18598

Top cover

View attachment 18599

Side

View attachment 18600

Looks like some rust in the holes, not sure if it's from a cooling system or what.

View attachment 18601

Top with cover removed

View attachment 18602

View attachment 18603

In the beginning what I did as a suggestion from another forum member what I did was multi meter probe on neg terminal I walked each balance lead connection back and subtracted the difference between them to give me each cells v.

 

[MrNatural22]

Curious if anyone else bought these A123 24v batteries and done any capacity testing on theirs? If so post your results. ?

 

[Benaranguren]

I'm looking to increase my battery capacity and considering getting this pack. I currently have a 24V power wall (https://bigbattery.com/product/24v-lifepo4-power-wall/) but it's out-of-stock.

Considering this is the same chemistry, can I parallel connect this to the power wall?

 

[Rmeadomavic]

I wonder about connecting the new balance leads to the old so the existing cover plate fits properly.

I did. They are even labeled. No solder necessary. I also have the Overkill Solar 8s BMS with upgraded wires.

 

[Picasso]

To my eyes "Top with cover removed" Look at heating on bus bars, look at plastic melted to bus from said cover. What caused that and is this why removed from service? . Again just from looking at the pic, small tolerances and swelling caused these to short out in intended use. A large detailed pic of the cell/bus bar would be nice

 

[MrNatural22]

To my eyes "Top with cover removed" Look at heating on bus bars, look at plastic melted to bus from said cover. What caused that and is this why removed from service? . Again just from looking at the pic, small tolerances and swelling caused these to short out in intended use. A large detailed pic of the cell/bus bar would be nice

Not sure what your seeing? There was no melted plastic on the buss bars on the two I have?
This is #1

 

[Picasso]

Compare to @No.15

https://diysolarforum.com/attachments/mvimg_20200727_172201-jpg.18602/

Edit: maybe I am just seeing weld marks from cell clamping. again just to my eyes from the pic I dont own one.

 

[MrNatural22]

There is some black on the some buss bar welds but the inside of the cover is clean.
Also these are supposed to be new not taken out of service. ?
Haven’t tested the second one yet, waiting on the BMS.
These pics are from #2

@Rmeadomavic

You say your leads were labeled and no soldering needed. How did you connect to the battery balance leads? I have 2 and neither had labeled balance wires?
You have any pictures on what’s under the blue tape bundle?

 

[Rmeadomavic]

There is some black on the some buss bar welds but the inside of the cover is clean.
Also these are supposed to be new not taken out of service. ?
Haven’t tested the second one yet, waiting on the BMS.
These pics are from #2

@Rmeadomavic

You say your leads were labeled and no soldering needed. How did you connect to the battery balance leads? I have 2 and neither had labeled balance wires?
You have any pictures on what’s under the blue tape bundle?

View attachment 19322View attachment 19323

Butt splice connectors. Wires are labeled s0-s8. You can trace them from the bus bars too.
.

 

[Rmeadomavic]

Butt splice connectors. Wires are labeled s0-s8. You can trace them from the bus bars too.
.

Different battery, same process.(not my video)

My current setup still needs some tidying, but
I just had a second battery and BMS delivered after how impressed I was with this one.