NewStats: 3,263,369 , 8,179,928 topics. Date: Thursday, 05 June 2025 at 05:14 PM 424r2k

Veew:

I was hoping the fan inside the charger would expel the heat from the diode.

I did say it stopped the reverse current, but I think the charging might be slower now because of the voltage drop.

Still wear am small heat sink. Yes it might be slower but the difference may not be much.

A friend have been on my neck for some time to build a power station for him. He works remote and has limited budget, wanted something for his Lights, phones and Laptop and Modem / MIFI etc.

After long persuasion from him, I decided to come up with a Li-ion 3s8p 12v / 224Wh, 150W portable power station ( small bobo )

Charging current can be selected for 4.5A (soft) or 7.5A (fast)
Accepted Charging voltage from ( current battery voltage + 1v ) to 40V max
USB 5V 2A
200VA inverter
224Wh battery
USB only mode save battery by shutting down inverter, reduced fan speed.
LED for status indication (soft/fast charge, battery level, usb only, mode switch)

Final look

Well done!

moneymind:
210 pieces available, 2500mah. N600 bulk price.

17s Bluetooth bms, 100amps N30k

Whatsapp or call 08036761triple8

have you done any capacity test to know the real capacity, if you have can you show proof

edobor108:
have you done any capacity test to know the real capacity, if you have can you show proof

Koko

Queed:
Final look

Nice nice

Queed:
Final look

impressive.
How does the control board works?

Queed:
Charging current can be selected for 4.5A (soft) or 7.5A (fast)
Accepted Charging voltage from ( current battery voltage + 1v ) to 40V max
USB 5V 2A
200VA inverter
224WA battery
USB only mode save battery by shutting down inverter, reduced fan speed.
LED for status indication (soft/fast charge, battery level, usb only, mode switch)

Nice...

Good job

Just interested in the charging regulation, how does the microcontroller controls the charging current?

It still send signal to the buck converter?

moneymind:
210 pieces available, 2500mah. N600 bulk price.

17s Bluetooth bms, 100amps N30k

Whatsapp or call 08036761triple8

Can this bms be used for a 13s or a 7s ?

okikigsm:


Na miracle be that o,looking at d dateu hide your face for so long boss

Lol... greetings baba.

dollarnaira:
@veew
You just dey stress yourself up and down .
6ah 4s system is too tiny to slap a whole 50a bms.

Get an active balancer which is the most important to prevent voltage inbalance.

Charge via a buck converter set to your desired voltage and have peace of mind.

By the way, will you use inverter for this set up? What are your loads?

Hahaha 😆 😂 I'm not the original builder boss, I bought it at a giveaway price because some of the cells were dead. I bought replacement cells and decide to use it to learn and so far I've really learnt alot.

I got to understand I can't even use half of the 50amp rating on the bms with my current load; for now I use a 200w mini inverter and my loads are wifi router and charge phones/ laptop.

Yes I got the a 4S 5A active balancer installed yesterday, I noticed the light on the balancer is always on... is that normal?

Another modification I did is increasing the parallel cells to 4S7P so a total of 28 6ah cells.
Since I have a 5A active balancer installed to handle the balancing, will it be a problem?

justiniyke29:

Can this bms be used for a 13s or a 7s ?

Sorry, my mistake. It's actually a 14s bms.

Veew:


Hahaha 😆 😂 I'm not the original builder boss, I bought it at a giveaway price because some of the cells were dead. I bought replacement cells and decide to use it to learn and so far I've really learnt alot.

I got to understand I can't even use half of the 50amp rating on the bms with my current load; for now I use a 200w mini inverter and my loads are wifi router and charge phones/ laptop.

Yes I got the a 4S 5A active balancer installed yesterday, I noticed the light on the balancer is always on... is that normal?

Another modification I did is increasing the parallel cells to 4S7P so a total of 28 6ah cells.
Since I have a 5A active balancer installed to handle the balancing, will it be a problem?

Now you have a working system.
Active balancer light OK.
Ensure u don't go below 11v during discharge.

dollarnaira:


Now you have a working system.
Active balancer light OK.
Ensure u don't go below 11v during discharge.

The bms cut off discharge around 11.8v prior to installation of the balancer, I'm still observing.

Obnoxious2001:

Nice...

Good job

Just interested in the charging regulation, how does the microcontroller controls the charging current?

It still send signal to the buck converter?

The micro controller measures the current via a hall effect sensor, processes it and then sends control signal to the buck converter.

officialfestus:
impressive.
How does the control board works?

At the heart of the control board is the microcontroller Atmega8.
It measures voltage of each cell, the charger, current flowing into the battery and also the power (servers also as control) button.

Processes it and uses the result to determine certain actions, for example:

stop charging if battery voltage up to max.
stop inverter and usb if battery voltage below min, or if any of the 3series cell below minimal cell
Start top balancing if charging and cell difference beyond minimum level, reduce charge current if necessary.
Maintain charger current to defied soft / fast
Display the right colour LED based on measured voltages, charging, and/or predefined current.

The beauty of the board is scalability. I could use this same board for say a 2KVA, 2KWH system and all I need change are the surrounding dependencies: Use 2KVA inverter, Use bigger buck converter ( or more in parallel ), use 2KWh battery etc. but the board it self remains the same!

Below is an example of processed data outputs of the controller

Queed:


At the heart of the control board is the microcontroller Atmega8.
It measures voltage of each cell, the charger, current flowing into the battery and also the power (servers also as control) button.

Processes it and uses the result to determine certain actions, for example:

stop charging if battery voltage up to max.
stop inverter and usb if battery voltage below min, or if any of the 3series cell below minimal cell
Start top balancing if charging and cell difference beyond minimum level, reduce charge current if necessary.
Maintain charger current to defied soft / fast
Display the right colour LED based on measured voltages, charging, and/or predefined current.

The beauty of the board is scalability. I could use this same board for say a 2KVA, 2KWH system and all I need change are the surrounding dependencies: Use 2KVA inverter, Use bigger buck converter ( or more in parallel ), use 2KWh battery etc. but the board it self remains the same!

Below is an example of processed data outputs of the controller

wow, where can I get this board?

Queed:


The micro controller measures the current via a hall effect sensor, processes it and then sends control signal to the buck converter.

Okay 👌🏾 thank you 😊

officialfestus:
wow, where can I get this board?

Custom made by me. You need one or something more specific?

Queed:

Custom made by me. You need one or something more specific?

I'll need one soon.

4s bms N19k (2 available)
Battery boxes with display 12v.
N12k with terminal, N9k without terminal.

Call or WhatsApp 08036761triple8

This is cool, Cworth battery box, do Cworth sell only the box? What capacity is the BMS?

ajabani4allah:
This is cool, Cworth battery box, do Cworth sell only the box? What capacity is the BMS?

100amps bms. I bought the battery and used the cells for another project.

moneymind:


100amps bms. I bought the battery and used the cells for another project.

Are you in Lagos? I will be needing the box and the terminal and probably the BMS too. what about the battery level display meter?

Good day all, please where do you buy your cells from

Thanks

cyberjacker:
Good day all, please where do you buy your cells from

Thanks

tetralogyfallot

officialfestus:
tetralogyfallot

No cell for now.ramadan Just end.

If he get he for don come here show us pic

okikigsm:


No cell for now.ramadan Just end.

If he get he for don come here show us pic

call him is like he have

okikigsm:


No cell for now.ramadan Just end.

If he get he for don come here show us pic

he have cells in stock.

okikigsm:


No cell for now.ramadan Just end.

If he get he for don come here show us pic

cells dey o. I've got clean 3.2A 18650 lg lithium ion cells available.