NewStats: 3,264,429 , 8,183,704 topics. Date: Wednesday, 11 June 2025 at 05:02 AM 1s3749

officialfestus:
I thought that the function of the bms if we use chargers or inverters meant for lead acids batteries.

The function of the BMS is to cut off at set points, but to achieve that one has to be conservative, unfortunately the parameters we use is to squeeze out every ounce of power from the battery, so at the end of the day we charge it like a lead acid battery.

For those interested in the Delta 2, it's at an all time low on Jumia.

officialfestus:
Dear Diy lifepo4 builders,

I intend going into this soon as resources to build Lithium-ion is very costly now, and majorly most parts I used in building are always ordered from China.

From my own perspective or view, it seems lifepo4 cells bloat like the regular powerbank cells, what are the majors in place to tackle this issue?

Most battery chemistries will bloat when over charged, same is attainable with our banks but if care is taken to charge it as it should, you won't have a problem with bloating.

Have you asked why the chargers made for lithium batteries generally are Constant Current and Constant Voltage systems? Once it gets to the desired voltage it stops, no need for absorption. However due to the fact that we still use inverters or chargers (due to cost or financial restraint) meant primarily for lead acid batteries, we tend to slightly overcharge our batteries which in turn results to bloating. If we however stay within the range then bloating would not be a problem, but very slight bloating is expected and totally natural.

Intellab:

200a JK Bluetooth BMS with 1a active balancer from Valto. 3000w pure sine wave inverter.
I used 6mm cable. My battery is 314ah.

What the voltage of your system? 12v 24v or 48v cos 6mm cable is actually too small for a 12v or 24v, even a 48v system will struggle.

Also lok at your bms setting to ascertain the settings for your charge and discharge cos most BMS come presetvto just 40a.

Revert when u can.

Intellab:


Actually, I was trying to power a 1HP Astra Sumo pump using an 18650 battery pack.
After that, I built an 8kW LiFePO4 system and installed a 0.5HP Sumo pump instead.
The reason for the downgrade was that the LiFePO4 setup couldn’t handle the surge required to start the 1HP pump. So, I had to switch to the 0.5HP unit.

What's the size of the bms used in the build as well as your inverter size and voltage. Please also provide the max amp draw of your pumps if possible.

Most lifepo4 cells can handle output of 1c even though we're advised to run continuously at 0.2 - 0.5c, so if your battery is a 300ah battery pack you can pull 300a without issues, your only limitation will be your BMS and cable size.

So do provide us the above let's critic ur build

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Available

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Cosmopolice:
You see yourself. Small breeze blow, fowl nyash don dey open😂. Continue

One man has all the past questions and interview questions for all the oil and gas companies in Nigeria (Agip, Chevron, TOTAL, NLNG etc) and even federal government agencies. I cut cap for u

He has all the experience and can't secure the job himself. Let people continue to be decieved.
I stopped bothering a long time ago.... All the best to everyone 😊

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Available

Queed:
New build: 3s32p, 864Wh, 500W pure sine wave power station with external battery and monitoring via wifi. Just finished server and front end side. More updates coming in..

Nice one bro, this looks cool. Care to explain the circuitry ?

Intellab:

On 25v charge, it drops to 24v, then pump starts behaving as if I am trying to power it with a low current.
I will charge to 28v and try.

What's your configuration? Parallel or Series?

ezenwaez:

Not yet but very soon.

@ezenwaez please stop spamming the thread, lots of people have complained about this severally but you only pay deaf ears to these and continue on your merry way.

Note that you don't know it all and you've made lots of people lose track of useful information with ur constant post. Calm down.

officialfestus:
@ dollarnaira please what's the usefulness of the shunt?
I plan on getting without a shunt.

Without a shunt you can only measure voltage but not amperage. So if u're using for just voltage display then it's fine but if u need to measure capacity then you need a shunt.

Note that based on the amount of current u'll be ing through the meter, you should endeavor to get an adequately spec'ed one for the purpose. Cheers

@ceejay80s where are you brother? It's been awhile, hope you and yours are doing okay? Kind Regards

Ahyjo:
Please how genuine is this Valto guy ?

Very genuine, you can read up testimonies on this thread

HeavenlyBang:
Spotted on AliExpress.

260k for 4kwh, I think Will Prowse tested these cells a few years ago and while they're grade B you can pull about 95% rated capacity.

Just depends on if they're properly matched + BMS quality. Also if you even get your order

Please share your link, no one ships batteries for free on AE

BigDickProblems:


Bro, I don’t agree. Lai Lai.
15V to 16V is no longer a 12V system.

You can tell me that you will use a bulk converter and set it to maybe 12.6V or 12.8V depending on the battery type. But telling me that a 16V or 15V is a 12V system is false.

Bros calm down, most 12v inverter systems safely run BTW 10.5v - 15v, the sachet inverters do BTW 9.5v - 15v, while victron does BTW 9v - 17v and they're all 12v systems.

A quick question though,if you don't put them under 12v where would you fit it?

Jabez55:
What could cause a 12v 4s 70ah lithium battery pack not to charge to full capacity. The charging cut off at 15.8v

Which of the lithium chemistry, lithium ion or lithium iron phosphate

officialfestus:
50p 3s in progress.

Looking good

bassdow:
You need understand rarely do I consult google and the likes to make a response.

Also i think the degrading is about 10 to over 50% based on temperature, among other things. In fact if the battery is fully charged sef, na another issue because it hates it

This guy calm down small, "you rarely consult google" and I a response to my post that you said I don't use the internet intelligently and now you claim not to use Google . Like I stated before u're a funny guy, smart but funny, unfortunately there are times us "intelligent" people need to chill.

I write most times not from google but from experience.

swagifted:
I for like see electric car wey de run on 75kwh of tubular battery storage

Abi oh, some arguments are just not worth the time to type it. The weight, the space, the maintenance period and the danger of spilling acid everywhere, yet some people hold on to an argument cos it's their forte.

Has anyone asked why the sudden resurgence of solar in Nigeria? Trust me it's not cos of Band A, it's because of the stability Lithium batteries has brought to installations. The fail rates for installations has drastically reduced, that's why anyone can claim to be an installer and can cos Lithium just works.

Installers know the shege pro max they suffered in the hands of lead acid batteries, some still dey igbobi after suffering from broken backs. Lolz

bassdow:
is that what you think ? That I am selective ?

Well me no get strength everytime to respond to some kind comments. You want me to give MATHs ba. Me dey speak mostly from experience, and Knowledge.

You need maths to tell you the viability of a Lithium battery decreases as it ages even while still on shelves. Keep waiting

Do grace me with a response on the shelf life of lithium battery is lead acid batteries. (Lithium when stored at BTW 50 -70% SOC or even while used will degrade to 80% in 10yrs) meaning you only lose 20% capacity in 10yrs, while lead acid will sulphate even while sitting on the shelf for only a year and if not attended to, will permanently damage in 2yrs if not desulphated.

bassdow:
Not everyOne got such time. Even me mostly come in here when bored. IT work no easy so when in a certain condition, and need clear my head, I find things to distract me and boom, I come to Nairaland looking for Arguments

Lolz, u're a funny guy. U definitely come looking for arguments, but only those you feel you can win, that's why you only answer based on sentiments and not on scientifically proven principles or deductions.

I asked for you to give ur maths on your comments on my earlier post am still waiting for your response.

Bruteality1:


Lol. Lithium maybe better but Tubular still serves

Let's get it straight, no one is disputing this fact that it won't serve, the fact all boils down to value for money even if it's small money.

Whether you use Keke,kurupe, bus, taxi, Uber, corolla or Gwagon, you must reach ur destination. Sha choose wisely. Cheers

bassdow:
...but there are MaintainNance Free Deep Cycle batteries na.

As for the so called war, I tell you say na person without personal experience go bother. Those wey Tubular or GEL / SLA / VRLA / AGM battery don serve, go hear all the praises rained on Lithium batteries, rush go buy am; hopefully they don't get disAppointed if they're Lucky or their useCase fits in.

Another set are FRESHERs (new Comers) to Solar world.

For the likes of Us wey don dey play with chemicals, from small, come still dey extract batteries from laptop batteries at less than age 18-years old dey build mini backUps, I wonder wetin those wey only got to know solar when it became popular thanks to APC regime wan tell us.

Personally, I decide when to go Tubular, and when to go SLA / GEL. Lithium has got it's place especially if size (Portability) & weight is a consideration - the more reason it's used in electric Cars / Bikes (weight factor) , Gadgets e.g Phones, PCs, etc (portability).

Mind you, Lead Acid batteries are much cheaper upfront than lithium based batteries. Similar reason a lot of people prefer buying Generator, than going Solar.
Lithium batteries can cost as much as 2 to 3 times more upFront.

What about Simplicity, and the fact it's been battle tested and rugged.


What about in places with much Heat ?

Abeg make I go chop. been battling with database data recovery for a new client since Sunday. To get client sweet, to collect Money sweet, but the work na die.

What's the price of an AGM/GEL from a reputable brand? Pls state and run a price comparism for us as against the above stated argument.

Secondly, a greater percentage of people SUGGESTING lithium are all coming from a lead acid background, some for more than 15 to 20yrs, built my first inverter setup In 2008/9.

As per ur the DIY route for lithium based batteries, I believe I have built more DIY packs to give me enough first hand experience and technical know how to advise any newbie on the right path to take.

When you chop finish we await ur writeup. Cheers

abuzz33:


Tubular is between 250-270k for 220ah. It is not 100ah DOD but 176ah or roughly 2.1kwh

24v 2.5kwh lifepo4 is 600k.

So how's this math correct? Have u forgotten it takes 2pc of the 220ah to get 24v? Which in turn means that u're getting 2.1kwh (according) to ur maths at 540k (bear in mind that tubularor gel or any other lead acid offeringat this price point is substandard), while still according to ur maths, u're getting 2.5kwh for 600k, mind you this includes a smaller size, faster charging, longer battery life and of course no maintenance.

Bros no vex but try calm down small, let's not overflog this issue, the lithium vs lead acid battery comparison war ended almost 2yrs ago.

Let him that has teeth chew kolanut...... Cheers

dollarnaira:


My oga!
I hail oo.

Boss I greet you sir