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Hi all! I just ordered 8pcs LiFePO4 Cells 3.2v 200ah from RJ Energy to build my own 24V200Ah battery, but they didn't have a BMS with Bluetooth in stock. Can anyone recommend a good BMS with Bluetooth and low temp cut off?

Hi @Fish Freak . I am definitely not an expert on this. I just canceled my Chargery-order for several reasons. It's very expensive, the relays are very expensive, but the most important thing is that the relays draw about 36Wh. That means the relays alone draw 0,8Kw pr. 24 hours. In addition...

@Fish Freak I just ordered the BMS8T-300 from Jason at Chargery. Think they also have an 100Ah-version and adjustable temp cutoffs. Attached is the manual. I think @Steve_S is helping them with an updated version coming soon.

I have indeed, sir!

Thank you very much, @Hedges :)

That's correct, and I'll try to explain. I was too impatient. The problem (for me) was that the voltage of the first cell didn't rise, not on the power supply or when I measured the voltage with a multimeter. I thought I had done something wrong with the power supply and that the cell didn't...

Hey @Fish Freak I ordered these directly from RJ Energy, contact Carl Wu sales7@rj-lithium.com, he has been very helpful. I don't know if shipping to the US is working now, but they took under a week to Norway.

Buy a fridge rated A+++, they draw as low as 12Wh, but even under 20Wh will save you a lot of watt-consumption. The same with TV you can get an A++ rated 42" that draw 30Wh.

BobG, honestly, I cannot determine 100% they are exactly the same, but they have exactly the same spec,s the exact same exterior, the exact same manual and so on. I'm confident they are the same and I have just ordered the 3Kw 24V with Bluetooth-connection. Goosepower. This is mainly an...

Hey @smoothJoey, here is a link to the product: https://www.alibaba.com/product-detail/Daly-8s-lfp-bms-for-24v_62464056602.html?spm=a2700.galleryofferlist.0.0.440457cc1qbKd4&bypass=true

Yes, I know I will have to crank it up to 3,65 to do a top balance. I will post result, but I'm going away for a few days so will be some time next week :-) Thanks a lot for your help!

Sure @sharpey, I paid 90usd for a BMS8T-300. The shunt is included, but the relays are not. 200A is 49usd 400A is 62 usd.

(sorry for my English, I'm from Norway) I have to thank @BarkingSpider for this amazing and easy way to dischagre a single cell. Much quicker than connecting a light bulb. And I actually could have done this at my cabin, I had everything I needed to discharge the cell. I followed his advice...

Yes, it's true @halfwave , I haven't clamped the cells together. Didn't know about this actually and the cells are swelling a bit now as they are fully charged/top balanced. I think I saw a video with Will where he just puts some tape around the cells so I did the same... I have however swapped...

Does anybody know if there is a tutorial how to make proper leads for a power supply?

Great, thanks! But do you know why the specifications say max. 1000w PV Array Power but the maximum PV input is 40A? It doesn't add up. See attachment.

Hey! I just ordered this power supply to top balance my battery cells: https://www.amazon.com/gp/product/B07ML2MP9Q I understand it is recommended to use thicker leads. How do I make new leads? Or can I buy thicker leads?

From AlteStore: " Open Circuit Voltage (Voc) Open circuit voltage is how many volts the solar panel outputs with no load on it. If you just measure with a voltmeter across the plus and minus leads, you will read Voc. Since the solar panel isn’t connected to anything, there is no load on it, and...

Hehe, of course not, but good to know the theoretical specs :) I want to upgrade my solar charging from 1000wh/40Ah to 2000W/80Ah and now I not that this will not be a problem for the cells. Discharge 2400W. Thank you for your help!

I have wondered about swelling since I got my cells. They were slightly swollen when I got them. Just enough so the bus-bars are bit too short. In the process of top balancing 16 x 202Ah now. This is how they look after top balancing. Is this swelling ok? Should I do something to compress the...

Hey! Are panels 12V or 24 volts? Isnt it up to the inverter what voltage range ut can handle? Im not in the US, Im in Norway. Isnt it hard to find a single panel over 60v?

I have a Voltronic 24V 2400W all-in-one inverter and a 1Kw solar array. According to the manual, it can handle 1Kw of solar power. I called the dealer and asked about what would happen if I oversized my solar array and if this could damage my inverter. He told me putting more than 1Kw into the...

I'm having trouble with my lifepo4 battery (waiting for new BMS) and decided to build a 24v battery from some old 12v batteries I have laying around from the pre-lifepo4 days. I used this diagram to connect 4x12v 100Ah batteries to what should be a 24v 200Ah battery, but sparks and smoke flew...

I'm top balancing 8 brand new 3,2V 202Ah cells with a Longwei power supply. I have set the voltage for the time being to 3,5. But have a couple of questions. 1. When the charging starts, the voltage on the power supply dropped to 3,40. But the voltage on the cells is about 3,1. Should they not...

Thanks a lot, @Supervstech ! I read somewhere that it's important to either connect the leads to the cells before or after you turn the power supply on. Dont remember which way is the right way. Do you know which way is correct? And since I am at my off-grid cabin I need to power the power...

The cells are connected in parallel, but when I measure the voltage with a multimeter, they are not the same.

I have exactly the same problem. Two panels each showing about 20V, connected in series 0 volt. If its ht e MC4 connectors do I have to replace all of them, or is there a way to find out which one is faulty?

No, I didn't have enough of them so I made my own, see attached picture. 2mm thick.

Hey! I'm getting conflicting feedback regarding the Daly BMS with Bluetooth. One sales rep told me that I can control the BMS with a laptop via a UART-cable, but another sales rep told me that I will ONLY be able to control the BMS through Bluetooth and the Chinese WeChat-app. And the big...

Hi! I am having a strange problem with the Xiaoxiang BMS App. I can only access it when the BMS has a charge, either from the solar panels or from a generator. Also. the bars always stay yellow, never turn green, even if I charge to 3,55V.