₦airaland Forum

Marykhay:
Lols, I don’t know why you guys are scared of the battery pack, it’s safe and not hazardous. It’s about a year plus now.

But recently I just had to do a capacity test out of curiosity. Seems the cells were salvaged by the builder cos it’s not up to capacity.

Or maybe my PWM has been limiting the charge due to high resistance in my SCC to battery wire which I changed yesterday. The former wire was thinner and was barely giving the same wattage I’m getting with this new 6mm cable today.

But if all my testing goes well, getting an MPPT soon too, I will update the house on everything.

Xanderone:
Not good enough

Soldering 18650s isn't even the best approach. He should invest in an inexpensive spot welder. The rechargeable one I got 4 years ago for 25k is still going strong.

He should use nickel strips or even copper strips for goodness sake.

Is there a BMS in this thing 😳? Cos that pack is a fire hazard waiting to happen. 18650s aren't so forgiving with irregular charging and thermal runways unlike their counterpart in the phosphate chemistry.

Lols, I don’t know why you guys are scared of the battery pack, it’s safe and not hazardous. It’s about a year plus now.

But recently I just had to do a capacity test out of curiosity. Seems the cells were salvaged by the builder cos it’s not up to capacity.

Xanderone:
The cells should get to 4.2v per cell on a 12v charger only if they're s (4 BMS wires).

4s (5 wires from BMS) means they'll share that 12v charger input which may be why it's stuck at 3.65 per cell.

It’s a LifePo4 cells.
They have a nominal Voltage of 3.2V and a cutoff or full voltage of 3.65V.


Thanks.

fixitng:
Laptops Type C ports usually have an indicator icon for USB only or both USB and fast charge. It means that not all Type C ports is meant for charging.

However, I suggest you get an Engr to fix your charging port. Do not attempt to use this converter cord on your laptop as it may damage your motherboard completely.

Thanks.

Alright Bro. Thank you.

I’ll consider the cost of repairing the burnt DC port or getting a dedicated Type-C charger for it.

udemzyudex:
I don't think this will charge it, though you can get it and see.
I'll suggest you get another type charger, it will charge it though it's expensive.
45w is around #11-12k.

Ok. Thank you Bro.
I am going to choose between fixing it or buying a dedicated type c charger. Thanks Bro

Kaczynski:
Only if you want to see your laptop get toast like bread in an oven.

Ok. Thanks Bro.

I’ll take it to an Engineer.

Hi Guys,
Pls my Hp Elitebook 830 G5 dc jack port or charging port got burnt, though my laptop is still working fine. can I try charging it with the USB-C thunderbolt? Something like this, Will it charge?


My idea is since the laptop still works fine but for the DC charging, why not I just use the type c?

Tinubu?


14 more characters needed

Pls my laptop charger port got burnt. How much will it cost me to fix it? Appreciate a quick reply pls.

dollarnaira:
12v means anything from 9v to 15v

Ok. Thanks Chief

favouredbymercy:
Contact Valto, he has the 500w continuous (1000w peak) PSW inverter.

Ok. Thanks Chief.

ChngedChnges:
I guess it's a DC fan.
It's safe and okay. I use same too

That’s good you have the experience.

It’s actually a 12V motor rated fan. Although it’s bypassed to not use its circuit cos it got burnt. So regularly it works with a 9V charger which works just fine for over a year now.

Today, due to capacity test on my battery, I tried running it directly on the battery but it was blowing heavily and drawing about 2 amps. I unplugged quickly and came here to ask if it’s ok.

Later today, I’ll plug it back for full testing of my battery. Thanks.

Guys pls is it ok to connect a 12V fan to my Battery even though the battery could get as high as 14V during charging? I’m talking about Longterm risk.

@dollarnaira
Saint2ace
And co?

Can anyone kindly suggest a 500watts pure sine wave inverter that is great? From experience. Thanks

Can anyone kindly suggest a 500watts pure sine wave inverter that is great? From experience. Thanks

dollarnaira:
Na cost of material.
The higher you go the better.
Best deal is the 300ah if it is up to capacity.

Probable breakdown:
200a smart bms = 85k.
300ah cells = 345k
Terminals = 12k
Casing =
Total = 442k

Chief what if I just need 4 units of the 50Ah cells?
I have other materials to construct.
How much?

lovediehatelive:
Something is wrong with this nairaland account.


Registered May 2008


Last seen December 2008



But profile picture uploaded March 2012!!!!

How comes? Someone isn't online, hasn't been online, then about 4 years later profile picture was uploaded.


Make this make sense!!!

If what purpose does it serve that you had to hide the username?

bassdow:
you still here asking for CHEAPest price again. the CHEAPest you got earlier, you didn't seem to get value, yet you here seeking for another.

But I’m getting it this time from MRReed at least he is a reliable fellow from what we’ve all seen so far.

And I know too well that there are different brands and they come in different prices. I didn’t commit any crime if I want the cheaper brand 😭.

adimx:
[/b]


This a cheap one, but it’s ok for the size of your battery pack.

Thank you Chief.

Mrreed:
For the pack to drop that fast, Battery capacity is gone.

😭😭😭😭😭😭😭
Pls what’s the cheapest 12V 4S and small capacity like

50Ah system I.e 640Wh
40Ah system I.e 512Wh
60Ah system 1.e 768Wh

Coupled with no BMS or anything just the couples cells, you have? Since I have other requirements?

@Valto

Pls how much is your 20Ah 3.2V LifePo4 cells?

Gshems:
These cells looks like salvaged cells. I think that's the issue. I'd advise you not to add more cells to it. If you get money, just buy new cells and diy a bigger capacity for yourself

Exactly my thoughts. Thanks Boss.
😭😭😭😭😭😭😭

Happy Sunday my people. Thanks for all your inputs on my predicament so far.

Like someone advised that I should charge the battery full today and measure each cells of my system. Here are the results below. It is worth noting that immediately it hit the 14.6V mark on load it went down to 13.9V:

Battery 0 -> Battery 1 = 3.51V

Battery 1 -> Battery 2 = 3.49V

Battery 2 -> Battery 3= 3.49V

Battery 3 -> Battery 4 = 3..49V


The problem, like I mentioned earlier, was that the 768Wh 12.8V capacity does not even get to half of what it should be.

More Context:
I use 3 units of a 180Watts Panels running on a 60Amps PWM controller, and a Sachet inverter.

Further Context
In just about 10mins under a load of about 40Watts it drops down to 13.1V which I always feel is not normal, but hey, that’s why I’m here.

So pls house what could be wrong the system? Thanks in anticipation.

@dollarnaira
@penuelseun
@capnies
@adimx
@Mrreed
@valto
And co

Penuelseun:
Charge the battery fully to confirm if it is indeed balanced, you can't know at this state

Interesting.
Thanks I’ll do that tomorrow and get back.

adimx:
Maybe your Charging voltage is likely not giving a full charge.



You still need it cos the batteries at some point will no longer be balanced.

Charging voltage is set at 14.6V. And it beeps everyday on the inverter whenever it’s full.
However, it just doesn’t last up to 700Wh.

As for the balancer, can you kindly post a picture of your recommendation?

adimx:
Just get an external 2amps active balancer and add to the battery pack.

Chief thank you. Though I just confirmed earlier this morning that the imbalance in the system is not significant:

Battery 0 -> Battery 1 = 3.18V

Battery 1 -> Battery 2 = 3.18V

Battery 2 -> Battery 3= 3.18V

Battery 3 -> Battery 4 = 3.2V


So the problem is why is a 768Wh system not up to 400Wh from my capacity test? Are they fake cells? Or is there some other problem that I don’t know?

capnies:
What size of pwm are you using the truth is if your pwm is 30A only 200-250w will be used for a 12v system the rest are wasted as heat and can even destroy the controller.

Change the pwm to mppt.

That would be the end of your problem.

Charging is one thing, delivering the required voltage and current is another.

It’s a 60Amps PWM

capnies:
⁷

With the reading the cells are balanced only . 0.02v

What size of panel
Pwm controllers are not too good for lifepo4 cells.

Don't tamper with it GET 30A MPPT CONTROLLER
INCREASE THE PANEL TO 350-400W
you'll have peace.

Lifepo4 cells have long cycle life to die so soon

Thanks Chief for pointing out that the cells are indeed balanced (negligible unbalance), meaning I have no problem with the guy’s weird configuration anymore as well as the imbalance of the system.


I use 3units of 180Watts panels. Which is 540Watts. It charges fine. No issues at all with any component of the system. However, the system doesn’t last long enough for its capacity. This is the part I don’t understand anymore.

Pointing out that I should change to an MPPT is suggesting to me that it could be that the PWM is limiting its charge to less than 3.65per cell? Meaning that it doesn’t fully charge the system?

Well, I’ll get the MPPT and see if the problem goes away or not.

For more context guys:
I use the system for my router, fans and other basic things especially when there is no light.

It is connected to a MSW satchet inverter and a PWM controller.

Even if the satchet inverter has an efficiency of worst case scenario of 70%:
I’m still supposed to get around 540Wh capacity.

But from my testing using calculated loads, this system shuts at 336Wh which is really bad.

Good morning Chiefs,

I’m having a head start with my issue.

With regards to this system I posted earlier, these are the readings I got from the 4S configuration using the BMS connection the builder did:

Battery 0 -> Battery 1 = 3.18V

Battery 1 -> Battery 2 = 3.18V

Battery 2 -> Battery 3= 3.18V

Battery 3 -> Battery 4 = 3.2V

The problem, like I mentioned earlier, was that the 768Wh 12.8V capacity does not even get to half of what it should be. I guess this result is giving me a conclusion already.

But I need to hear from experienced builders:
@dollarnaira
@Mrreed (you no even dey reason my matter 😭)
@Valto (Senior man, at least say anything)
@capnies

Please what do you think is wrong with this system?
A. Weak or refurbished cells?
B. Unbalanced cells (I don’t know if the imbalance in the reading is negligible) causing the system to not reach its complete capacity?

capnies:
FOR EASY TOP BALANCE CONNECT THE BMS AND BALANCER AT ONCE AND CHARGE TO 3.65V WITH YOUR DEDICATED CHARGER NOW.

READ ALL THE CELLS TO ENSURE THEIR BALANCED.

AFTER BALANCING YOU CAN DISCONNECT THE BALANCER IF YOU WANT.

BUT LET THE BALANCER STAY FOR HOURS AFTER TOP BALANCING BEFORE YOU REMOVE IT IF YOU WANT TO.

Alright. Thanks Chief