diy solar

diy solar

Big Battery 24v A123

Looking forwards to this so I dont have to buy the $20 ones from bigbattery.

Can anyone answer if these can be used standing on non-BMS end? Or can you stack on top of eachother easily?
 
Argosy said:
Looking forwards to this so I dont have to buy the $20 ones from bigbattery.

Can anyone answer if these can be used standing on non-BMS end? Or can you stack on top of eachother easily?
Click to expand...

Not sure on positioning these as they are pouch cells.
Stacking on top of each other without some sort of support between them might not be a good idea as they weigh 50lbs each and would be pushing the relatively thin plastic covers down onto the buss bar connections.
Anyone familiar with pouch cell orientation might have an answer on what position the cells can be placed.
?✌️
 
Yeah. Why I was kind of thinking end on end...but there is a connection there so that might screw it up too. Will probably need a rack of some sort.
 
Stacking batteries seems an effective way to build a fire. Batteries should also have space to breathe and dissipate heat. Thermal guns have demonstrated high temperatures under high loads. Too bad many folks only talk in C temps these days. Old timers still relate to F temps.
 
I bought two on the 12th - no word so far. I inquired about this matter this morning. Doesn't seem quite right so far.

Got customer service - they just now created a shipping label - after an order on the 12th. Not impressed.
 
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what kind of load can these take for charge/discharge?
24V 100ah - is 1C or 2C able or even more??
 
I ordered their 130 aH BMS with 6AWG connective cables if that helps a little. I would have preferred 4AWG but some 12 V 100 aH batteries only have 10AWG wires - I think.

I think the choice of BMS is the answer.
 
AUGUST 19 - 10:24 PMShipment information sent to FedEx

AUGUST 12th - Order with payment made. Not too Johnny on the Spot.
 
Ordered the $799 A123 24V battery w/BMS and free shipping on Aug 5, delivered by Fedex on Aug 21.

From what I can tell (and would love if someone here can confirm), there is no need to do cell-balance soldering as it's already done (socket popping out of the right side of battery below, to which the BMS is plugged with the 8-wire that came with it). The BMS is non-branded and has 130A on the sticker. The fuse on the red cord attached to the BMS is 120A and terminated with a SB175 Anderson plug.

My solar build is planned for 24V, including inverter/charger, EPever MPPT/SCC, Renogy 2 x 320W panels, etc.

BTW BigBattery is now selling yet another version of this battery package with a nicer all-in-one box with integrated dual-switch in a black metal case for $899.

a123.jpg
 
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Argosy said:
what kind of load can these take for charge/discharge?
24V 100ah - is 1C or 2C able or even more??
Click to expand...

One thing Will's videos consistently show is that manufacturers claims often mean little to nothing at all. It would appear that Big Battery is all in with the 130A BMS that many include in their order. A 130A BMS should enable a robust rate of charge and discharge. I did see a video where the 6AWG BMS wires got hot. But the load was huge - a clothes dryer that managed to drain the batteries prior to their published output rating. But we all know that super high drain rates will do that. A 1000 watt drain is more reasonable - Will tends to use a drain rate in that general area - when able to. A heat gun instead of a clothes dryer.

I think these battery packs have been in use for years on Fisker(?)"personal transportation". If so they have a proven record. Hence the "automotive grade" description that Will used. An automotive grade battery is going to be capable of a high discharge rate of course.

I'm not accustomed to thinking in 1C or 2C though.
 
Argosy said:
@traderd65 could you take a couple close ups of the 8-wire BMS adapter?
Click to expand...

Attached two close-up photos of the BMS.

Battery voltage test - Multimeter (AM33D) shows 26.2V ?⚡
 

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Sorry am more concerned with the lead wire adapter piece. Someone else here is trying to find what works with this battery so you dont have to splice in wires...and not bigbattery is out of these. Thank you!
 
The BMS adapter from BigBattery consists of two parts. One is an adapter PCB which converts the socket from the battery pack to 9-pin 2.54mm JST male connector. The second part is the 8-wire cell balance lead cable, one end is 9-pin 2.54mm JST female connector and another end is a 8-pin 1.5mm JST female connector. Yes, the cable has only 8 wires from the positive of 8 cells. no the negative lead wire. I guess the BigBattery's 130A BMS don't need the it as it already has one from battery negative. The adapter PCB does expose the negative, so I made my own 9-wire balance lead wire cable with 9-pin 2.54mm JST female connectors both both end.

BTW, I use the overkill 24V 100A BMS.
 
johnnyding said:
The BMS adapter from BigBattery consists of two parts. One is an adapter PCB which converts the socket from the battery pack to 9-pin 2.54mm JST male connector. The second part is the 8-wire cell balance lead cable, one end is 9-pin 2.54mm JST female connector and another end is a 8-pin 1.5mm JST female connector. Yes, the cable has only 8 wires from the positive of 8 cells. no the negative lead wire. I guess the BigBattery's 130A BMS don't need the it as it already has one from battery negative. The adapter PCB does expose the negative, so I made my own 9-wire balance lead wire cable with 9-pin 2.54mm JST female connectors both both end.

BTW, I use the overkill 24V 100A BMS.
Click to expand...

Seems to me like buyers want the bluetooth capability. My question is this - if the BMS is doing its job do we really need to monitor it via bluetooth? Strikes me as another possible point of failure. But I'm barely even nerd class, let alone geek class.

I don't need another item to worry about. Eleven cars and trucks fit that bill nicely. I'm also old as dust.
 
softdown said:
My question is this - if the BMS is doing its job do we really need to monitor it via bluetooth?
Click to expand...
I have a Wifi connection to my Orion and I can actually see a lot of data in graphical form. I find it more useful than some inverter data at this point.
 
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