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Let's try this another way. The big LFP cells we deal with are "tedious" to Top Balance because they hold a LOT of AH. Take a 200AH LFP cell. It can discharge 200A (1.0C) and take 100A to charge (.5C) From 0%SOC (2.50v) to 100% 3.65v would take 2 hours at 100A, 4 hours at 50A and so on. To TOP...

First things first. Likely you only damaged the one cell, which puffed up. More than likely it got too much charge or took too much for some reason, it could be internal failure (not that likely) or something else wrong like bad connections. Test each cell independently and write down teh...

FIRST, I will say that I have not been following this thread but read a bit of the current talk. My response therefore will cover more stuff and some obvious Wives Tales / Postulation & Theorization. Working LFP batteries have absolutely NO PROBLEM with sitting at 3.400 Volts per cell...

I produced that Document but THAT is not th Test Reports or anything IS IT ? I HELP people because it is the way I am and have always been. I have been doing Freeware/Shareware & Opensource since the mid 1980s ! I am also TERMINAL with Cancer (told in 2014 I had 5-7 yrs (I won't make it another...

Good Day folks, I am starting this thread related to the Chargery DCC, so the first post will be a basic "intro". See the following posts for more info. The DC contactor is designed specially to work with the CHARGERY BMS', the following are some features: Bi-directional connection, one...

I am also sorry this happened to you and also Thank You for posting about this experience because sadly, there are Bad Players everywhere and we need to be careful. The OP appears to be in Northern Peru, while we may not have a large membership from there, we do have quite a few people from...

Good Day Folks, Well here we are in April 2023 and things are changing fast post "Covidus Interruptus" and good things are happening ! Prices stabilizing and even going down in some sectors (not food sadly), new bigger, better & more capable products including BMS'. After converting all of...

This is SIMPLE and everyone scoots around the answer. The "Working Voltage" is from 3.000-3.400 and this is where the balance of the cells should be close and once outside that Range, they will diverge. This is for both Charging (above 3.400 & Discharging below 3.000). Matched & Batched cells...

I'M GONNA SAY THIS ONCE ! TAKE THE BS OVER FREE NOT FREE CRAP ELSEWHERE. THAT DOG IS SHOT. MEDICAL CARE FOR PROFIT IS A CRIME AGAINST HUMANITY. PERIOD. I WILL REPORT FURTHER CRAP LIKE THAT AND HAVE IT REMOVED ! NO STUPID POLITICS, TAKE IT TO FACEPOX !!!

How many threads are you going to start on this ? Why are you posting this stuff in other threads... You are polluting them you know by Spamming YOUR Issues. Stick to one or two threads YOU STARTED and stop posting this everywhere. The only thing you will accomplish is to irritate people and...

Building your own battery packs is not hard, a lot of us do that here. We always recomend that you use Native Voltage Batteries, ie 12, 24 or 48 V. Placing Lithium Based batteries in Series more often than not causes issues. Using Battery Packs in Parallel increases your AH, the Fault tolerance...

I run 24V, all of my battery packs have a QNBBM-8S Active Balancer on them and they work quite well to keep everything nicely balanced. Passive Balancing is essentially useless on large capacity LFP as it only burns off hi voltage cells at low power by dissipation. There have been some recent...

Rather than Postulating, Theorising or just tossing about Conjecture... Let get this sorted. (Cell quality etc = Conjecture which serves NO PURPOSE but to irritate the Victim and those seeking FACTS.) An important Fact: This is Mobile Installation, Appears that the cells were "not bound"...

I figured I would chime in again here, with some personal oberservations from my Thrash tests related to the popular EVE 280 Cells people are getting. Below is the chart that explains it best from their docs. The curve is consistently from about 3.35-3.37 volts post charging & settling to 3.10...

This is a General Heads Up for all considering to buy new Cells & Battery Assemblies. September 11, 2020. I received word this afternoon from some suppliers that Battery Cell prices are going up by the manufacturers. They are citing the increasing demand for supplies & materials. Apparently...

Eeeek Gads Like juggling 4 fragmentation grenades with the pins pulled. Time to revisit basics & safety methods...

EVE like every other company does a Production Run Test at the end. They have massive banks of testing gear that each cell gets hooked up to. They cycle the cells and take 3 reading points and measure the mOhms at those points, which must fall into a very specific range (it's tight)...

For ANY electrical room use Class-C Fire extinguishers or "ABC Dry" Dangerous vs. Safe batteries, Explosion and fire test! - YouTube

FUNNY... since going OFF Grid and using "Green Energy" as I am solar powered my Quality of Life has Improved ! Not having to pay Big Power Corp the hostage fees for the grid connection puts ready cash in my pocket for other things. Not having to worry about Utilities failing due to storms etc...

! REMEMBER ! LFP Full Voltage Curve is from 2.500 Volts to 3.650 Volts per cell. LFP Working Voltage is from 3.000 Volts to 3.400 Volts Per Cell. 3.200 Volts per cell is the Nominal Voltage (aka 50%). * The Working Voltage is what provides you with the Amp Hours from the Cells. * Below...

THE CELLS ARRIVED ! \\YAY// Everything arrived in "perfect" condition. Not a mark or scratch and nothing to note at all. NO DOUBT That these are Grade-A, NEW cells ! All cells wrapped individually, double boxed with foam between the boxes too. Quite an effort to unpack them ! Well done...

Seriously You are a NOOBIE Here, I'm not, one of the first couple of hundred members. I also Did the Chargery BMS Manuals with the graphics works and all. I got a few other Senior Members to help with getting the Chargery BMS' improved and helped with the development of their DCC's (Solid State...

My suggestions are as follows: Top charge & Top balance your cells to at least 3.600 and allow the charge to drop to at least 14A but you can let it go down to 5A but don't go lower. Bulk/Absorb Voltage should be 55.2 Volts (3.450V per cell.) EndAmps/TailCurrent is 14A, the point where ti...

I live off-grid, quite rural & remote and the "grid" is over $75,000 away and staying put where it is. I decided to go fully solar quite early on, immediately upon seeing the "on grid" quite from Big Power... Being Ex Military & a retired IT Engineer, I knew the only way for me to go was to use...

There are also a few things at play that are not that obvious for someone who is not deeply into DC systems. Every Lug, Terminal, Fuse / Breaker on a DC Line contributes resistance and that translates into Voltage & Amperage drops across the line. Even the Amperage Handling of Fuse (and...

Ohh My, the rabbit warren of things here. 1) Ambient Temperatures will affect the swelling factor. Generally not very much - so this is a minor issue. 2) Charge & Discharge rate does affect internal cell temps due to the chemical interactions. 3) Expansion & Contraction is normal BUT it is...

I use a QNBBM-8S Actie Balancer on all 5 packs. 3x 280 (two bulk, one properly matched & batched) and two 175AH EV Grade LFP cells. They work WONDERFULLY but these are more costly than most want (8S 1 pc = $144 USD) I'm not going to argue the point Active BMS is GOOD and wise, most especially...

Further on Will's post, we have also had Manufacturers/Developers, Vendors/Suppliers who have come on here, and interacted with the membership in both supporting them and even in gaining their help & feedback to improve products & offerings. There are other boards out there, I've gone & looked...

In any Mobile Application, it is critical to secure the cells and everything attached thereto. That not only includes the cells bundled up but the BMS Harness, the Leads running from cells to BMS, the BMS and everything to prevent vibration from loosening up anything. One loose connection can...

I'm offgrid, solar powered. I use a Grundfos SQ-5 Soft-start 120V deep well pump. This is on a 120V/15A circuit with CGFI. Soft-start prevents a big surge which is really important for solar/inverter driven systems. My pump is 240' feet deep, pushes to a 50 Gal Pressure tank in the pumphouse...