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The wire gauge depends on the voltage, the amp load (worst case), and the type of current (AC or DC) and the length of the wire. your 2/0 for the battery to the inverter is fine as it should be able to handle 100 amps @ 12VDC for short distances. The 8AWG should also be Ok for the charging...

Upgrading the BMS as the Balancing and Power out for the Screen failed on the BMS, but other functions seem to still be working. Moving to the JK-B2A25S-RP balancer which uses relays to switch power. Once I get the new one in I will open up the old one and see if I can determine what happened...

Right, that is why it has a BMS... I was referring to the overall SOC, and modified limits of charge and discharge.

When balancing, you are balancing the charge, not the voltage. Voltage is only an indicator of SOC when near the top of the voltage range, or at the bottom. What kind of charger are you using? If you don't have a charger, you should get one. There are many good hobby chargers that will...

https://www.aliexpress.com/item/1005001770791172.html?spm=a2g0s.9042311.0.0.14594c4daFFM20

I would recommend charging the 8S packs to 3.5v or even 3.6v for yhe top off just to make sure all the cells are at or just past the flat part of the curve. I did the same thing and used 3.45 and still had to individually charge the cells with anywhere from 1.5 AH to 60 AH.

I have been waiting for the materials to build the battery box, in the meantime today I installed 1/8 neoprene foam rubber pads (60 durometer) between the cells on two banks. Just the right squishy/firm ratio in my opinion :) They are just the right size (1/8") to allow the bus bars to fit...

Finished the main battery disconnect box now that the last of the items arrived.

I have the 2A balance version of this BMS and just wired it in yesterday. Everything works fine except the discharge relay does not power up. The relay energizes and passes the main current from the battery if I put 12V DC to the relay from a separate power supply so it isn't the relay. It is...

I am going to use the non smart DALY BMS for my battery. I am building a critical circuit UPS/battery backup for the house using LiFePO4 cells (16S) and an all in one low frequency inverter. In my case the batteries will be in the basement, and if it gets that cold down there I have much...

I have figured out how to power up the relays by testing the unused wires out of the BMS. Apparently the Pre-Charge+ cable is also where the V+ comes from to power the relays (Charge/Discharge/Pre-Charge). I wired the ACC+ wire to the Pre-Charge+ wire with a crimp connector (I am not using...

My experience with using an active balancer on my house UPS (no solar) isnt great. After 9 or 10 months my well top balanced cells in a 48v pack with new good quality cells were a mess and I had to re top balance cell by cell. I turned it off and the cells stayed in much better balance. I am...

I have the same BMS to upgrade an older failed unit. I found this diagram which is in English.

Got the battery all wired in, not just need to finish the case and hinged top.

Nice. I will be using utility primarily, the generator is for when the power goes out, will supply the panel and recharge the batteries.

I think you can set the voltage on the JK BMS to start active balancing using the supercaps.

Contactors fail and so do MOSFET's, and contactors are mechanical. Many contactors use a lot of power, so contactor selection is important. There aren't that many affordable choices for BMS that can handle more than 100 amps, but DALY is one of them. I know that some have had bad experiences...

Ah, damaged threads. That would make sense in that scenario.

Generally no they are setup for a specific number of cells, but as @Supervstech has indicated there are some BMS that can handle different numbers of cells. I know the Chargery BMS does 2-8 or 2-16 cells depending on which model you buy.

Also nice that the LV6548's are UL certified by TUV. A very good and tough testing / ISO house.

That pack frightens me on many levels. I think it is all of the LiPo Pouch Cells in one place. :)

I am thinking of getting one of these. How did the install go?

I made it using 2020 extrusion and plastic sheeting. I probably wouldn't do it again due to the cost. It does work well though. Also the BMS worked flawlessly for a few months then suddenly died. the DIsplay is off, and the BMS has a red flashing light, and I can't connect to it any longer...

Yes. if there is grid power, it will bypass that to the panel. But if the grid power goes down, it will switch to battery, like a UPS. That is how I will be using mine. Or if you have solar panels, you can prioritize to use solar first, then supplement with grid power to make up the load.

I am building a 16S 48 volt battery using Lishen 272 Ah cells, hopefully I will have the cells in the next few days. I decided to use a 300 Amp, Daly LiFePO4 BMS (not the smart BMS). I am also going to use a Chargery BMS16T with the balancing disabled just to monitor the pack as I would like...

It was just under $1300, and it ouputs two phase 110v so you can do 240 for pumps and welders and such.

Could there have been a loose connection to a battery?

Mine were mostly in the 15-25% range when they arrived, but some were higher, like 70 amp hours higher, which made balancing fun!

I am using Lishen 272Ah LiFePO4 batteries, 16 in series. Still waiting 9n delivery. I bought Daly 300 amp BMS units. No need to connect the BMS to the charge controller in the Growatt. I will maybe add a second battery at some point as well.