₦airaland Forum

there are some figures you see and you digest with common sense. Most likely reason for these high % figures is that most of the projects are channeled through the governor's office.

No matter the corruption and greed

AntiZikist:
She no fine.

Highest a 4/10

Milf status is even worse . I will give her a 2/10 as a milf

she is actually quite pretty. Not my type but unlike the majority of fairskinned women she actually has beauty

I think commenting about her beauty is fair game. It's not something i would do but she was the one who contested Most Beautiful Girl in Nigeria, Miss Africa, and Miss Intercontinental. she made comments about her beauty fair game.

RandDigital:
It's called rule of law. Maybe you don't understand the concept.

Maybe?

WizardOfNG:
Within West Africa, standardized number plates and drivers license, with clear identification of nation of origin of driver and vehicle, will help.

You don't get the big picture. You may have a drivers license and vehicle registration that is easily and efficiently identified to make your travel within West Africa more efficient, yet your nation of origin, and even address within that nation, will be known.

We already have same with the Nigerian International passport which is ECOWAS compliant.

You are missing the point. The difficulties of free movement within west Africa have more to do with bad roads and checkpoints. The reason I haven’t taken a road trip to Ghana for example is because it is such a tiresome experience not because of my driving license or my number plate.

The EU may have a uniform drivers license but their number plates from country to country could not be any more unstandardized. Their roads are good and there are no checkpoints that’s why there is free movement of food and services as well as tourism by road.

Is it number plate and driving license that hinders free movement or checkpoints and bad roads?

OredoPikin:
Boss lets stop talking like illiterates
IGR is not and will never be a measure of development

It is because IGR is a measure of the ability to spend on infrastructure and social programmes. It is also a measure of the quality of the residents. Low IGR = Poor quality residents, Poor quality residents = low disposable income. Low disposable income = unattractive investment destination for investment (low income residents cannot afford good hotels, schools, entertainment, quality housing etc) You don’t invest (or locate) a Sheraton or shoprite in a place where the people cannot afford the prices or locate a factory in a place where the staff will not get good schools and hospitals for their staff or the govt cannot afford to pay for security. It’s no coincidence that the places with the highest incidences of kidnapping and insecurity have low IGR and the places with the highest IGR are the safest

Therefore low IGR = Unattractive destination for investment = low quality residents= low tax base= low level of development.

There is not much IGR in dancing!

kristien4:
if their are no comms between battery bms and inverter, does the bms still do its job of overtemperature, overcharge, overdischarge protection, cell balancing, Or it just stays idle?

The BMS is the gatekeeper and protector of the battery. The difference between one that is communicating with the charge controller/inverter and one that isn’t is that a communicating BMS sends its charge parameters to the CC/inverter and says this is how I want you to charge me and the CC/inverter responds. When there is no communication the BMS becomes a standalone gatekeeper, if the charge parameters you configure on the CC/inverter and the incoming charge are within its parameters it allows charging. Once the limits of the parameters in the BMS are violated it shuts down charging or the whole battery altogether.

Your BMS is never idle. Idle means it’s not doing its job in which case you are in trouble if that were allowed to happen. A BMS should shut down and give a fault error if for any reason it cannot perform its functions.


It’s like going to a party, the bouncer at the hall has a list of invited guests and their seating arrangements. If your name is on the list you are allowed in and ushered to your seat. If the uninvited whose names are not on the list attempt to enter, the hall bouncer shuts down the entrance to the hall until the uninvited are evicted. Comms between inverter/CC and BMS is like the bouncer at the hall (BMS) sending a list of updated invited guests to another bouncer at the gate of the compound (inverter or CC) in real time. such that everyone entering the compound has been screened before they even get to the hall and as soon as a guest is added to the list in the hall it is reflected in the list at the gate instantly without having to walk over to the gate to amend the list.. But if for any reason comms or no comms an uninvited guest gets to the hall, the hall bouncer (BMS) closes the door to anyone uninvited and can shut down the hall until order is restored.

ojesymsym:
@ask4bk, and @casualobserver, the lithium profile on most charge controllers on hybrid inverters use 28.8V (24V system) which translates to 3.6V, so if you set the BMS to 3.55V, will the BMS be able to take care of it from there or one has to find a way to also edit the inverter settings?

Charge voltage and battery voltage are different. The charge voltage needs to be higher than the battery voltage or else there is no potential difference and hence no charging will take place or charging will stop.


If both are properly configured and their is communication between BMS and inverter, the BMS will request the charge voltage and send a signal to the charge controller or inverter to stop charging when it reaches the voltage cutoff set in the BMS.

If there is no comms the BMS should cutoff once it’s reaches its cut off voltage. Actually you should be able to set the charge voltage on the inverter if there is no comms between BMS and Inverter and you are using a “user defined” charge setting.

mctfopt:
I wish Nigerians can actually differ without insults. Oh well, if wishes were horses beggars will surely ride.

I find it very annoying when someone continuously quotes me with unintelligent comments that add no value to myself or the forum. Nobody has said he can’t charge to 3.65v. That’s not the issue and never has been. The issue from the get go is whether it is prudent to. But he goes on and on and on. This is the same guy who claimed weak cells or mismatched cells are charged or balanced at a lower voltage. Clearly his understanding is defective. But he won’t let go!

Dam5reey1:
Exactly... English teacher..

Me dont know anything.

Here is a Manufacturer charging Voltage 58.4V explain why they printed this on their battery.

Like I said you are either daft or lack proper English comprehension. Perhaps you should read the thread again. Maybe if you read slowly you will understand what is being said.

Either way I hope you are not a professional installer.

ask4bk:
I follow lifepo4 contents a lot. I'm member to some lifepo4 online communities in the USA. The general consensus for top users and engineers in this area is that lifepo4 be changed at max 13.9-14.0v. Some even go lower. Some go higher. But I only shared the consensus.

I asked Chatgpt now, and here's the answer they gave.

Charging a LiFePO4 battery to 14.6V can be problematic because it places the battery near its maximum safe voltage, which can stress the cells and shorten the battery's lifespan. Here are some reasons for avoiding 14.6V as a charging limit:

1. Increased Stress on Cells: Charging to the upper voltage limit can push the cells close to overcharge, increasing stress and leading to premature aging.


2. Reduced Cycle Life: LiFePO4 batteries have a longer lifespan when not charged to the maximum voltage. Lowering the float charge (e.g., to 14.0V as you've set) can help maintain the battery's cycle life, potentially reaching or exceeding the 4000 cycles.


3. Minimal Capacity Gain: Charging from 14.0V to 14.6V typically only adds a few percent to the overall capacity. The slight gain in capacity does not compensate for the loss in lifespan caused by regular charging to the higher voltage.


4. Heat Generation: Charging at higher voltages can cause the battery to heat up slightly, which also contributes to wear and tear over time.


Keeping the voltage lower (like 14.0V) balances capacity with longevity, making it a good choice for extending your battery's useful life

Abeg leave the guy and let him continue arguing with himself. Nothing worse than the man with half knowledge who thinks he knows it all and refuses to be corrected.

Nobody starts with expert knowledge it is in admitting errors and past bad practices that we improve but a man who continues to defend his old and flawed ways never improves.

Dam5reey1:
You point are off Topic, Can I use 14.6V on a well Built pack is well balanced at the top with low Deviation?

Stop adding errors from inverter and all.

The battery i tested all have 3.65V and BMS is active and there is no issue so far because I am using it.

Wether there is 0 gain or thats another topic.

You either have poor English comprehension or you are fundamentally not very intelligent and unable to grasp and compartmentalise issues.

dapsyra:
Maybe I am an academician , you never can tell. Anyway, thanks for the complement. Being able to have an academic perspective is a plus. Please be mindful that the whole Lithium battery innovation remained as academic papers for many years before finally making it into commercial production.

That said, I cannot find what is so academic about my post.



The crux of this current discussion is about the effect of charging to 3.65v on cell aging and that is what my post addressed squarely. It is not about capacity gain.

It is common knowledge that between 3.55v and 3.65v, an LFP cell have very little capacity therein.

I stated that charging to 3.65v/cell will not age the cells prematurely if done to manufacturer's specifications. You agreed with me when you wrote:


I said it is best to charge to 3.525v. You also agreed by saying:



The Pylontec recommended 3.55v is even higher that what I recommended.



I gave the reason in my post.


Get yourself a decent inverter if your inverter is not reading battery voltage correctly. Undersized battery cables or improperly torqued contacts can also be the culprits.

We are not that divergent then. As for the last point let’s not pretend that 90% of solar installations in Nigeria are done by people who know what they are doing. In Nigeria you don’t want to encourage flying close to the sun.

How many time do we see installers proudly posting pictures of installations where the inverter is sitting on top of a lead acid battery indoors? Are those the kind of installations or installlers you want to trust with cheap Chinese inverters or charge controllers charging to 3.65v?

But like you said strictly from an academic point, calendar ageing will probably degrade the battery long before the damage of going to 3.65v

Dam5reey1:
Show proof and not theory..
show me batteries that have diminished because of charging to 3.65, a quantifiable one vs a battery that was charged to 3.45V and their remaining capacity under the same conditions.

Enough of all these untested theories.

Manufacturer says no impact, you can do up to 3.65 and get rated capacity.

My opening post asked do you want to learn or not? The. I continued for the sake of others. If you wanted to learn and had done the research like you claim you did or at least quality research I wouldn’t have to post what I posted.


I am not here on an ego trip. You are wrong but do not want to admit you are wrong. I hope you aren’t an installer.

Nobody is arguing with you that you can charge to 3.65v, it just not advisable especially with the kind of quackery in Nigeria. You never did answer what happens if you are charging to 3.65v every day but your inverter or charge controller is actually seeing a lower voltage at the battery? You have not left any margin for error because according to you you have read the manufacturers report? For the sake of an extra 0.5%?

Dam5reey1:
Whats your point here?

Manufacturer's Specifications is what I follow.

I have seen a lot from cells manufacturers because did lots of background research, opened few packs and check how it was made, cell quality, BMS and all.

Evidence dey, but they just say make we no spoil people market, that its not a good thing

Do you want to learn or not?

The chart I posted above is for a B grade cell. B grade cells have no problem going to 3.65v. A bad cell will go to 3.65 v but it’s capacity will be diminished. If anything it is when you have a poor grade cell or mismatched cells you need a higher voltage to give all the poorest cell/s a change to get to its full capacity. For example if you have a 280k with 300ah capacity and a bad 280k cell with 265ah actual capacity, and you balance at 3.45, you are not going to get the 265ah out of the bad cell at 3.45v which means you won’t get the 265ah out of the entire battery. So I hope you see why it is the mismatched battery / poor grade cells that needs a higher voltage to balance.

However like I said whether grade A or grade Z there is not much capacity above 3.5-3.55v so no point going there. The illustration was just to let you know that mismatched/ poor grade cells in a battery need a higher balance voltage.

Ability to attain 3:65v is not how you determine a poor grade cell. You determine quality by voltage under load and capacity. A poor grade cell will drop voltage on heavy load. Like I said above, a poor quality cell will go to 3.65v no problem but it will likely have less capacity that it’s nameplate. All the more reason you need to balance at as high a voltage as you can to get the most out of the weakest cell.

So this idea that you balance at low voltage because a battery is made up of bad cells is wrong. You balance at low voltage because their isn’t much capacity at 3.65 to stress the battery for.

Dam5reey1:
Well I only quote you, it was you that decided to mention names to proof a point.
It was a general statement for all the brand you mentioned.

I only quoted Manufacturer's Spec sheets.. and how they have tested Cells before rating it.

I dont follow crowd, I question reason behind actions, and all I gathered from EVE, Hithium is that Is Cells can safely work from 3.65V to 2.5V without impact on Rated Life Cycle.

Just like @Dapsyra clearly stated charging low allows the battery to balance properly, however how time flies, BMS are now coming with Active balancers as High as 2A, which means you are good to go charge to 3.65V no problem. many now use the JK BMS, seplos Integrating Activate balancers. And many more.

Because of the rapid growth and demand for LFP. Most of the time QC are not done correctly. Some manufacturers dont use Matched Cells Capacity so there will be Deviation at the top hence they will recommend you charge lower than 3.65V just to Hide the imperfections, as the BMS have small current passive balancer that cannot balance the cells if charge higher.

This argument is a flawed one. Balancing cells is determined by the charge curve. You balance once the cells are out of the flat area because that is when the voltage disparity is apparent. This applies to good quality and mismatched or poor quality cells. At 3.55v all cells whether good or poor quality are for all intents and purpose at 100% capacity or as close to 100% as they will be. The only difference between poor quality or mismatched cells is that they go out of balance more than matched or good quality cells. Balancing voltage has nothing to do with quality of cells. Neither needs to go to 3.65v.

In practical application you go to 3.65v or 2.5v only when you are testing for capacity. If anything it’s the poor quality or mismatched cells you want to balance at a higher voltage.

dapsyra:
Charging LFP cell to 3.65v regularly will not degrade the cell prematurely as long as you adhere to the manufacturer's specified conditions. In the Eve 280Ah cell datasheet @Dam5reey1 posted, please see section 4.2 for proper charging conditions. It was stated therein that charge at 0.5C(A) to 3.65v and cutoff at 0.05C. This is the recommended upper limit.

Cutoff at 0.05C (5% of Capacity) for a 280Ah cell implies that you must stop charging when charging current tapers to 14A (0.05 x 280). This is where the issue lies. Many users simply don't adhere to this condition. They keep charging until cell current hits 0A at 3.65v, thereby overcharging the cell. This is the cause of the premature aging.

Pack builders and integrators specifies lower charging voltage to avoid this issue, knowing fully well that most end-users are incapable of complying. Most inverters / SCCs don't even have provision for tail current cutoff setting but premium SCCs have it.

To be on the safe side, it is better to charge below 3.65v/cell since you cannot enforce the 0.05C cutoff rule. LFP cells are not to be floated but if you are constrained to float them, then float at 3.4v/cell or lower.

In my LFP systems, I set bulk charge to 3.525v/cell (to allow room for BMS to balance the cells) and set float to 3.4v/cell. 3.525v/cell might be too high if you have mismatched cells and/or passive balancing, as one or more cells might runaway, thereby triggering BMS overvoltage protection.

This is academic. The point is what do you gain by charging to 3.65? That a car is certified to 6000rpm does not mean drive it all the time at 6000rpm. Let us also understand something about manufacturers, when they test, they test in the lab, none of these cells have actually under gone the lifespan projected in real life because the technology is not that old. Secondly, whether you go to 3.65 or 3.4, lifepo4 will eventually lose capacity due to calendar aging than whether you take it to 3.65 or not. Thirdly a manufacturer knows that the majority of its consumers will never use the product at it extremes whether lithium cells, cars or handsets, so they know and have factored in the few warranty claims in their pricing and claims. It does not a license to live at the extreme. Or you may just be that 0.03% whose cells fail because they run it to 3.65 all the time. Except as a Nigerian you probably have no one to run to for warranty.

The point is why take it to 3.65 for an extra 0.5%?

There is a reason why if you want to make a Pylontech warranty claim they need to see your charging history. Pylontech charges to 3.55v and cuts off at 3.04v. They know why they recommend doing that. They could just as easily said charge to 3.65v and cut off at 2.5v….but they didn’t……..toh!


Plus you are also making an assumption (which isn’t always correct) that your charge controller or inverter is reading your battery voltage correctly.

Dam5reey1:
Ehehn.. these guys are Recommending Low charge profile to cover their flaws, in choice of cells and BMSes.

Cells can safely charge to 3.65V without any negative impact. They were designed to operate that way...

Limiting your usage to only 60% to prolong your batteries is a marketing gimmicks..

Just like Cells Cycles ratings are 8000Cycles 4000 cycles, they are just playing with numbers.

And never compare Cell phone batteries to LFP, they are different applications, different chemistry.

A Phone batteries experience up to 1C Charge and Discharge.. some Phone do up 3C..

Now check what your own LFP Batteries, they dont even see 0.5C not to talk of 1C. But you are there shouting dont charge to 3.65V as if the batteries were not made and tested to that voltage before getting rated 6000Cycles, 2500 Cycles labels you see.

Before Samsung release the Folding phone, you think they didnt testing how long you can fold the phone before wear and tear. And someone will just wake up and say for your phone to last long only open and close it once daily....

The reason people do not charge to 3.65 or discharge down to 2.5 is because of the charge profile of lithium ion phosphate batteries. 95-98% of the capacity is somewhere between 3v and 3.4-3.5v approximately. There is not much to be gained charging to 3.65 or discharging to 2.5 weighed against the stress to the cells caused by constantly charging and discharging to these extremes. The more you charge to 3.65v, the more your cells expand. It’s not that it can’t , it just not really prudent to make a habit of it.

The blue line below is voltage with capacity from left to right. Observe the remaining capacity on the chart when the voltage is 3.v and 3.5v. Even if you are using high quality cells it’s not good practice. Even manufacturers like Pylontech despite 1C charge/discharge, reserve 5% capacity for this reason.

Many only go to 3.55 for balancing and float at 3.45v, cut off at 3v to leave a little for emergencies. Even at that you have approx 98% capacity.

seunjungle1:
It is a shame to have this man as my native state governor...
Amosun na man oo

Which Amosun, the one that chased Dangote’s refinery away from Ogun state or the one that did not respect contracts causing presidential jets to be seized?

You see that ministry of tourism? Has no purpose while we have no infrastructure or security. That’s why we never heard of her for her entire tenure except that she was sick at one time.

Post from April 29th

casualobserver:
There is a minister called Akali?


As far as tourism, whoever heads that ministry has the easiest job…there is nothing to deliver and a plethora of legitimate reasons why it is unreasonable in the near future to expect any progress in that sector. Tourism cannot take off in Nigeria without infrastructure, roads, adequate security, hospitality etc so we might as well scrap it for now. We that are in Nigeria are afraid to travel to explore our country because of these reasons, so why would a foreigner when there are other countries to explore with requisite infrastructure?

Ministry of tourism should be scrapped and any skilled sector staff deployed to foreign affairs and culture ministries until such a time when we have fixed the underlying infrastructure necessary for toirism.

Says the longest serving ruler of Nigeria! Of the 64 years of independence Obasanjo has been head of state for 11. 17% of what Nigeria has become is Obasanjo’s fault.

Says the longest serving ruler of Nigeria!

Love800:
What is the difference between purchasing power and value of naira?

Anyone has an idea?

same thing....at the end of the day money is just a piece of paper, its value is in what it can purchase.

why do people post things like this, was minimum wage N70K a month in 1985? A professor or a perm sec did not earn N14k in a whole year in 1985 so what exactly is the point of posting petrol from 1985?

omodoagba:
Yes he should mention the person name

he cant because even if true, he cant prove and because he cant prove, he will be exposing himself to a libel and damages suit.

Says the man who (metaphorically) was asked to stay rent free in a house he had no hope in hell of ever living in or owning in his life, enjoy all the facilities while the owner was away and responded by trying to change the cofo into his name.

We are talking about a man under whose watch multiple illegal acts and violations of the law took place but never had the “integrity” to resign!

Abi he forgot the law he “professes” when his government was printing trillions in ways and means without parliamentary approval for a start?

These types of behavior have become par for the course in our polity unfortunately but don’t start preaching about integrity.

IfnobeGod20:
But have something to show for his 62 years of existence. Please what about you, what can you show for your existence, who know you in your community, what impact have you made in your locality, even in the midst of your family and friends? I am cog sure you're still struggling to make ends meet.
In a political meeting of 5 to 10 hours, do you think a man of his calibre will be there for the whole hours? Is just like saying Tinubu or Atiku will be in a political meeting that will last for 5 hours when is not a convention or political primary.
Learn to apply common sense. Status play major role in life.

First of all I am not the one contesting for president. Secondly you just show the calibre of thinking required to support Obi. He can’t do a political meeting via zoom? Even FEC and NEC meetings are done via zoom.

Thirdly good night!

AMI3:
I don't understand u

I am not surprised

SmartPolician:
Given the fact that Nigeria is surrounded by francophone countries, the government ought to make French and English compulsory in Nigerian schools.

It will facilitate trades across the West African subregion and boost our chances of japaring to France and Canada 😂😂

Our local languages don't have to be compulsory. Our parents have a responsibility to teach us those ones.

The obsession with foreign languages is one reason we are backward.

Why does a man who claims to be smart and to have the solutions to the allocation and d prioritization of our national resources travel 3hrs for a meeting of 30minutes in this day and age of technology and ends up spending 7hrs? That is a man who does not know how to allocate and prioritize resources including time. Is it that he does not know how traveling on our roads are like and this is a possibility?

People won’t ask these essential questions instead they will believe the noise from a man who has nothing to show for his 8 years in charge of a state.