NewStats: 3,263,913 , 8,181,863 topics. Date: Sunday, 08 June 2025 at 06:22 PM 4l5c3t

dollarnaira:


You can drain more energy from the 12v than from the 24v. Cut off for the exact set up above is 9v while the cut off of the 24v is 21v ( with great capacity left undrained).

It the same. Standard li-ion 24v is 7s, that's 3v per cell cut off( 3v *7cells is 21v ). While standard li-ion 12 is 3s, being 3v per cell cut off ( 3v *3cells is 9v )

dollarnaira:


Testing at the moment

Nice nice, waiting for the capacity results.. I know that the tetra guy sells good cell, but my fingers crossed with 3.2Ah, 3.6v on a 18650 size. Awaiting your result update.

Queed:


It the same. Standard li-ion 24v is 7s, that's 3v per cell cut off( 3v *7cells is 21v ). While standard li-ion 12 is 3s, being 3v per cell cut off ( 3v *3cells is 9v )

Oh true didn't check well.
. Thanks

dollarnaira:


Oh true didn't check well.
. Thanks

Are you anywhere around rivers. Wld like to see first hand how this is done.

dollarnaira:


Testing at the moment

Final result:
68.4ah
759.24wh

Machiny:
Are you anywhere around rivers. Wld like to see first hand how this is done.

Lagos

dollarnaira:


Final result:
68.4ah
759.24wh

nice 1, that's around 2800mah per cell

Penuelseun:
nice 1, that's around 2800mah per cell

Yes roughly.
Freezer ran for about 8hrs, completed with powerbank charging till it gets to 8hrs 33mins.
Really great for a 24p3s.

dollarnaira:


These are lithium ion 3.7v per cell
Series will give 11.1v ( 3 cells )

Full charge is 4.2v per cell
Series = 12.6v ( still 12v system)

Lifepo4 is 3.2v per cell
Series 12.8v ( 4 cells )

Full charge is 3.50v per cell
Series 14.0v ( 12v system ).

Lithium ion 16v = 4s
Lithium ion 24v = 7s ( 7 cells )

Would you recommend your current cells over lifepo4 for powering entire house and a sumo? I don't mean as powerbank.
Mine is 644 pieces of 18650 batteries. 92P7S. But it seems I bought fake 18650.

Intellab:

Would you recommend your current cells over lifepo4 for powering entire house and a sumo? I don't mean as powerbank.
Mine is 644 pieces of 18650 batteries. 92P7S. But it seems I bought fake 18650.

NO.
The cash used will comfortably buy 4 brand new lifepo4 of good size.

644 pieces is huge but maintenance will be very hard if nickel strip is used to weld.

Extracted 18650 will be far better than so called new ones. Brand new 18650 don't come cheap.

LG and Samsung 26J are great despite being extracted.

dollarnaira:


Final result:
68.4ah
759.24wh

Nice. Well done Boss!

How much did the setup cost you? If possible a break down of the materials used will go a long way. Thanks in anticipation.

dollarnaira:

Yes roughly.
Freezer ran for about 8hrs, completed with powerbank charging till it gets to 8hrs 33mins.
Really great for a 24p3s.

I'm planning on building something similar.
What kind of charger do you use please?

Penuelseun:
nice 1, that's around 2800mah per cell

great result.

Veew:

I'm planning on building something similar.
What kind of charger do you use please?

Adjustable charger

BigDickProblems:


Nice. Well done Boss!

How much did the setup cost you? If possible a break down of the materials used will go a long way. Thanks in anticipation.

Cells 72k
Cable extracted from cars
Soldering iron
Lead. --- I don't spot well though extremely fast and smooth---Not my thing as I like to source for materials just along the street. .

N.B : soldering is tedious but very effective. Error can be corrected easily.

dollarnaira:


Cells 72k
Cable extracted from cars
Soldering iron
Lead. --- I don't spot well though extremely fast and smooth---Not my thing as I like to source for materials just along the street. .

N.B : soldering is tedious but very effective. Error can be corrected easily.

Seriously, you’d did a great work.

How about BMS, can you share an image? And also how you were able to connect the charging and output port for it. Please just take your time, I’m really interested . I stay around Ikeja and I can get those cells easily I believe.

dollarnaira:


Adjustable charger

You mean with buck converter?

BigDickProblems:

Seriously, you’d did a great work.

How about BMS, can you share an image? And also how you were able to connect the charging and output port for it. Please just take your time, I’m really interested . I stay around Ikeja and I can get those cells easily I believe.

NO BMS.
Just a balancer..

dollarnaira:


NO BMS.
Just a balancer..

My bad, I don’t know what a balancer is 🥲
I’ve only seen people use BMS in all the videos I’ve seen.
Could you kindly share a pics or something. Thanks.

Veew:

You mean with buck converter?

No.
This below

officialfestus:
what's the size of the battery box in inches?
Can it accommodate a 3s 150 cells?

Boxes sold, bms left (2)

dollarnaira:

No.
This below

I have been looking to buy this on AliExpress but exchange rate issues no gree. How much did it cost you and a link will be great, thanks

Penuelseun:
I have been looking to buy this on AliExpress but exchange rate issues no gree. How much did it cost you and a link will be great, thanks

The tin is a no go area now o.
With current exchange rate it costs over 122k.
This one had been with me for over 4yrs.

dollarnaira:


The tin is a no go area now o.
With current exchange rate it costs over 122k.
This one had been with me for over 4yrs.

Na wa for our naira o, it is well

dollarnaira:


The tin is a no go area now o.
With current exchange rate it costs over 122k.
This one had been with me for over 4yrs.

Omo!

Queed:


It the same. Standard li-ion 24v is 7s, that's 3v per cell cut off( 3v *7cells is 21v ). While standard li-ion 12 is 3s, being 3v per cell cut off ( 3v *3cells is 9v )

Though they look the same trust me 24v is far better and it will save your wire.
e. g if your appliance is 350w and you connect it to your 12v battery it mean you will need to draw 29Amp from the battery but if you connect the same appliance to 24v you will only draw 14Amp.

Sincerely I don't know why people build 12 battery
the 12v battery I build are just for phone charging and bulb lightning only

Although if you started with 12v it will be hard to change inverter, I wish I even started with 48v, it will not give your wire much stress

dollarnaira:


NO BMS.
Just a balancer..

Please try and add BMS although your battery will work without the BMS but trust me a day might come that shit may happened, it's the BMS that will rescue you, all balancer don't regulate charging, if your charger misbehave or you mistakenly set wrong setting it's BMS that will save you not balancer.

Don't go for the cheapest, go for the moderate price or try those smart BMS

barezy:


Though they look the same trust me 24v is far better and it will save your wire.
e. g if your appliance is 350w and you connect it to your 12v battery it mean you will need to draw 29Amp from the battery but if you connect the same appliance to 24v you will only draw 14Amp.

Sincerely I don't know why people build 12 battery
the 12v battery I build are just for phone charging and bulb lightning only

Although if you started with 12v it will be hard to change inverter, I wish I even started with 48v, it will not give your wire much stress

The assumption of your 12v ideology is 1million percent super wrong .

Retract the part that says "I don't know why people build 12v system"......

If you build a 12v system wrongly, you don't need to generalize it.

Can you state the difference between 50ah at 24v and 100ah at 12v?

Just last night I deliberately drew 18.7a on the system above-- 6 bulbs, freezer, 2 fans, charging, 32" tv, Decoder--- cable didn't even get warm.

Note: Most cars use 12v battery including
Rechargable fans
Solar kits
Bikes

Why do phone chargers get hot converting 220v to a very small 5v?

Why do car tyres and engines get hot after driving ?


An ordinary powerbank of 5v is enough to light up and charge phones..

E b like say you hit my kidney this morning.

NOTE: 24v is great, 48v is very sweet but don't condemn a working 12v system since our energy need differs and the way we all manage energy differs.

Those is band A will manage energy better than band D s.

Mind you am on 12v off-grid.

barezy:


Please try and add BMS although your battery will work without the BMS but trust me a day might come that shit may happened, it's the BMS that will rescue you, all balancer don't regulate charging, if your charger misbehave or you mistakenly set wrong setting it's BMS that will save you not balancer.

Don't go for the cheapest, go for the moderate price or try those smart BMS

What is inside the bms that regulate charging?
Do you depend on the bms to regulate your charging for you? Like using a charger of 15 - 20v and depend on the bms to regulate the charging?

I don't do any of the above?

But the above is mostly what guys do on YouTube where most of you depend on.

Again, I don't depend on YouTube because most of them copy and paste another person's idea. The cycle continues....

dollarnaira:


The assumption of your 12v ideology is 1million percent super wrong .

Retract the part that says "I don't know why people build 12v system"......

If you build a 12v system wrongly, you don't need to generalize it.

Can you state the difference between 50ah at 24v and 100ah at 12v?

Just last night I deliberately drew 18.7a on the system above-- 6 bulbs, freezer, 2 fans, charging, 32" tv, Decoder--- cable didn't even get warm.

Note: Most cars use 12v battery including
Rechargable fans
Solar kits
Bikes

Why do phone chargers get hot converting 220v to a very small 5v?

Why do car tyres and engines get hot after driving ?


An ordinary powerbank of 5v is enough to light up and charge phones..

E b like say you hit my kidney this morning.

NOTE: 24v is great, 48v is very sweet but don't condemn a working 12v system since our energy need differs and the way we all manage energy differs.

Those is band A will manage energy better than band D s.

Mind you am on 12v off-grid.

You get me wrong, am not condemning 12v
after all you your self said 24v is great and 48v is sweet, that's the same thing am saying why not go for great and leave 12v for small appliances.

I believe you know that most people are upgrading to 24v or even 48v, and charging is not easy you will need to change almost everything from charger to inverter, that's why am saying it's better to start with great as you said 😉

dollarnaira:


What is inside the bms that regulate charging?
Do you depend on the bms to regulate your charging for you? Like using a charger of 15 - 20v and depend on the bms to regulate the charging?

I don't do any of the above?

But the above is mostly what guys do on YouTube where most of you depend on.

Again, I don't depend on YouTube because most of them copy and paste another person's idea. The cycle continues....

you can't tell me you've not make a mistake in this DIY stuff before, am not saying BMS is perfect but is a sort of protection layer just in case the mistake comes, even the charger you're using can malfunction and supply higher voltage, although it's not a must but is a matter of choice, trust me it's a good choice for someone that use a better BMS