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I see. If you pay $120 you are buying directly from China. I dont see the CCP giving you back anything in the middle of a financial meltdown right now.

Wow! $180 a cell for us stock, and $120 a cell for China if you wait a bit longer. That’s amazing. What’s with labeling these 304ah and 320ah? Are these rated at 304ah but test higher? Or. Visa Versa?

Hey thanks. I didn’t know they were the same size. Any links to a good deal on a 304Ah cells?

Nice! If I had time I would probably do the China shipping thing. I found 280A/hr Eve cells for just $110 a cell if you wanna wait 40-60 days. I just don't have that time.

Are there any good deals on new Grade A 280A/hr Eve cells? I’ve noticed on Amazon they are selling brand new Grade A (supposedly) 280A/hr Eve cells for about $660 for a 4-pack with bus bars and nuts included. Its even a 2-3 day delivery! I’ve heard of people buying them for as low as $110...

Where are you located at? Because shipping inverters may negate any benefit because of insane shilling costs. I have a boat down in Ft Lauderdale that has a spare Xantrex 3000 watt inverter/charger. It has light corrosion on the circuit board from being in humid tropical locations. It just...

Interesting, would I need to disconnect the cell from the other batteries? Or do I just put it across the cell I think is bad?

Here is a screenshot of one of the four batteries.

Hello everyone, How can I get my cells to balance? I’m selling my boat and the lithium cells have been sitting for 6 months unattended with random buyers coming in and hitting switches, draining the system until the low voltage on the BMS units kicked in. When I arrived back in Florida from...

Overkill Solar BMS. I have one for each battery. They are stuffed in between the batteries and very thin. The people here on this forum have overwhelmingly recommended them and it turns out they were pretty good.

Hey thanks for the reply. I finished upgrading my entire battery bank from the ground up last year. I replaced most of the cables with incredibly thick 4/0 marine welding wire and performed a stress test with a FLIR unit discovering multiple other problems with the system installed by the...

One thing I’ve learned, especially working with damaged B or C grade batteries is that you want lots of them because they will fail. If you have just 2 batteries, when one goes out, that’s 50% of your system. In my case I have 4 batteries and if one drops, I still have 75% power left. Also...

From the advice I’ve gotten from multiple people here is that it’s always better in the long run to go with 2P packs and try to avoid anything bigger. They have all sorts of reasons and proved it regarding how different cells draw at different lengths, and how it can be dangerous with runners...

If I wasn’t selling the boat, I would replace all the cells and start from scratch using 6 BMS units and make 6 batteries of 2P 4S. And I would spend a little more time trying to figure out how the batteries are charging with 5A when the engines are on?? Where they are connected? And why two...

The system works decently. Out of the 4 batteries I made from the 48 cells, Battery #1 and Battery #4 contain the runners. They discharge way faster and charge slower than Batteries #2 & 3. But they still work with just a bit less time. As long as I don’t pull any big loads for more than a few...

I got the balancing numbers from the people here. (See other thread) as well as from Overkill Solar who recommended that too. Yes, the batteries balance even better with the power cut off. Keep in mind, in addition to the BMS balancing setting, I also have QNBBM Lithium Battery Balancers...

I might be confusing it with the Victron app which I used the same day?

When I first downloaded the Overkill Solar app, Xingxiao or whatever it’s called, the first thing it does is update the firmware.

Ok I’ll try that. When I originally made the cables I performed a resistance test to see if there was any difference. I also used a heat IR sensor gun to see if any were getting hotter than the others during the stress tests. There was no difference but I’ll see if there is one now for some...

Oh wow. I had at least 5-6 people on this forum in my other threads when I was building the system say those were very good balancers and they would work well in addition to the BMS ability to balance the batteries. At worst I was told they wouldn’t do any harm. They don’t connect to separate...

I ripped out any cable I could access over the last year and replaced most of them. There are so many that are deep inside the boat in inaccessible areas though. And as meticulous as I was testing out each individual cable in an attempt to see where it goes with the help of a French/Canadian...

But the balancers don’t connect between batteries, only between the individual 3P cells of the 4S batteries? How could they effect the overall batteries? Yes, when I re-designed the system I made all the cables the same length. They do charge up to full voltage where all of them are 100%. The...

Yes, all those little black boxes are QNBBM Lithium Battery balancers which only help balance individual cells and not between the parallel batteries. I just re-designed the system a month ago. I top balanced everything and then capacity tested each and every cell to match them before I created...

Hello, I re-installed 4 prismatic 300Ah LiFePo4 batteries in my boat a few months ago. Out of the 48 cells, I’ve constructed a 3P 4S system making 4, 300ah batteries at 1,200Ah. (See previous posts) Each battery has its own Overkill Solar BMS. I’ve noticed that Battery 1 & 4 are constantly...

Hey thanks! That’s really good to know. I’ve since reinstalled the LiFePo4 cells in thier new 3P-4S configuration. Each 300Ah battery having its own overkill Solar BMS and on:off switch. They’ve passed the stress test with flying colors!! I’m so happy this nightmare on my boat is finally...

QUESTIONS: This is the part I really need help with. I’ll go over each section and hopefully you guys can tell me the best settings to input based on the specs I gave above. I really appreciate it. VICTRON 500A Smart Shunt: (See pic for recent settings for my old lead acid batteries coming...

Hey everyone!! EDIT: Yes you read that correctly. I’m willing to pay someone for some good advice helping me choose the settings. I can PayPal you money if you’re willing to help me answer the questions on my second post below. ——————————————— I’m so excited. This is the end of the 5-month...

Oooops, sorry I have so much going on, that I gave you the wrong readings. (I posted the correct ones above though.) The bad readings I gave you were from two bad cells that we took out of the system. After 12 days, the majority of the 48 good cells I tested in the standing resistance test...

I performed the standing resistance test after top balancing them in parallel. Then connected them all together in parallel after the test was over and re-top balanced them again to prepare for the capacity test. I performed the capacity test immediately after top balancing them in parallel...

Correct. The cells are damaged. They are 6 years old and had no BMS on them or any kind of monitoring system when I purchased the boat. There was a leaky hatch above them dripping on them and they were sitting in 3” of water as well. I top balanced, and then capacity tested all 48 of them over...

Correct. I posted my results above for a 10-day standing test after a full top balance by parallel connecting all of them. After 10 days, the cells dropped from 3.65v to as low as 2.98v with no load, not connected to each other or anything. The capacity tests mirrored the standing...

Ok cool. My cells go down from 3.65v to 3.1 or even a few at 2.98v after just 10 days. They are 6 years old though and slightly abused. I’ll put them back in. Glad to hear they are not dangerous or worthless

So should I discharge them even lower? Bring them down to 3.4v?? They are currently sitting at 3.654v and not moving anymore.

Ok, I have an appointment for Wednesday to have an electrician come help me assemble my LiFePo4 cells back into my system. For now I’m letting these cells sit there where they currently are. 3.654v After I wrote this original post, I was able to get them down to 3.231v and they actually went...

Good to know. They are currently resting at 3.654v after discharging them from the dangerous 4.32v I found them at this morning. I got them down to 3.621v but after removing the load they went back up. I kept putting the load back on until they wouldn’t go back up over 3.65v and they still went...