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Diy Lithium Ion Like-minds - Technology Market (57) - Nairaland 354u5w

Diy Lithium Ion Like-minds (65297 Views)

bonetalk(m): 2:49pm On Mar 25

Penuelseun:
His battery pack is li-ion 3s with a maximum charge voltage of 12.6v, 14.6v is too much and will destroy his battery. He can step it down with a buck converter

thanks

officialfestus(m): 10:59pm On Mar 25

Update on my 1.5kw powerstation.
3s 1.5kw li-ion pack (100a bms and 1.2a balancer).
12v 3000w easun inverter with a continuous of 1500w.
Terminals.
Two 12x12 box.
Handle.
Voltmeter.
Buck converter.
14.6v 20A lifepo4 charger.

Note: battery was well balanced before the series connection. Now each serie reads 4.20v, 4.19v and 4.20v respectively.

The reason for the buck converter is to step-down the chargers voltage and Amps to 12.6V 10A. But I'll be doing 13v to hasten the charging process, since the battery pack has a bms installed to handle the voltage to prevent overcharging.

3 Likes

Veew: 10:13pm On Mar 27

Greetings to the OGs in the house.

I'm in the process of cell testing, 32700 3.2V LiFePO4 cells to be precise.

There are two cells in need of expert opinion:

**Cell 1**: Self-discharge from 3.23V to 3.19V within 24 hours but performs well under load test using a 12V DC cooling fan.

**Cell 2**: No self-discharge over the past 24 hours but does not perform well under load test; it reads 3.23V with no load but when the 12V DC cooling fan is connected, it jumps to 3.16V (a 0.07V drop) and bounces back to 3.23V once the load is disconnected. Other cells have a voltage drop of 0.01V or 0.02V when the same load is connected.

I want to know if either of these cells are worth considering.

dollarnaira: 9:27am On Mar 28

Veew:
Greetings to the OGs in the house.

I'm in the process of cell testing, 32700 3.2V LiFePO4 cells to be precise.

There are two cells in need of expert opinion:

**Cell 1**: Self-discharge from 3.23V to 3.19V within 24 hours but performs well under load test using a 12V DC cooling fan.

**Cell 2**: No self-discharge over the past 24 hours but does not perform well under load test; it reads 3.23V with no load but when the 12V DC cooling fan is connected, it jumps to 3.16V (a 0.07V drop) and bounces back to 3.23V once the load is disconnected. Other cells have a voltage drop of 0.01V or 0.02V when the same load is connected.

I want to know if either of these cells are worth considering.

They are good

Veew: 3:59pm On Mar 28

dollarnaira:

They are good

Ok, thank you boss

officialfestus(m): 6:14pm On Mar 28

Progress so far.

ksmart027(m): 6:29pm On Mar 28

officialfestus:
Progress so far.

How good is these inverter?

officialfestus(m): 7:49am On Mar 29

ksmart027:

How good is these inverter?

for the brands of psw I've used, they're very reliable.

Penuelseun(m): 8:59am On Mar 29

ksmart027:

How good is these inverter?

very rugged

Penuelseun(m): 8:59am On Mar 29

officialfestus:
Progress so far.

Baba teach us work na

officialfestus(m): 1:46pm On Mar 29

Penuelseun:
Baba teach us work na

you be boss na, i they follow your footsteps.

ksmart027(m): 8:49pm On Mar 29

Penuelseun:
very rugged

Nice, thanks boss

ksmart027(m): 8:50pm On Mar 29

officialfestus:
for the brands of psw I've used, they're very reliable.

Thanks for the info

officialfestus(m): 7:10pm On Mar 30

Completed

1 Like

ksmart027(m): 7:21pm On Mar 30

officialfestus:
Completed

Nice, how many kw?

officialfestus(m): 7:30pm On Mar 30

ksmart027:

Nice, how many kw?

1.5kw

Intellab(m): 5:25pm On Mar 31

officialfestus:
Progress so far.

Nice one. I am building 5.96kWH. 7S92P

1 Like

onenessone: 2:54am On Apr 01

Intellab:

Nice one. I am building 5.96kWH. 7S92P

Keep us posted on this please

officialfestus(m): 7:44am On Apr 01

Intellab:

Nice one. I am building 5.96kWH. 7S92P

wow! Keep us posted please.

1 Like

officialfestus(m): 7:44am On Apr 01

Good morning everyone, and happy new month to ya'll.

ajabani4allah(m): 9:04pm On Apr 01

officialfestus:
Completed

It seems this your PWM charge controller is different from regular ones. Does it allow setting of the charging voltage to align with voltage of the battery pack?

officialfestus(m): 5:47am On Apr 02

ajabani4allah:

It seems this your PWM charge controller is different from regular ones. Does it allow setting of the charging voltage to align with voltage of the battery pack?

it can be set to your preferred settings.

AdexAyanfe: 7:23am On Apr 03

dollarnaira:

You can't get the info you just looking at pix of scc. You actually test it physically or via recommendations.

Buy a cc with BSC... it is on jumia or powMr k-series. I have 3 brand new ones 20a each but to sell them they hard me. Buy the 20a or higher for this below:

Boss, thank you so much for your kind suggestion. I finally got the BSC4048 scc and it has been performing excellently. I took my time to read the manual, then I understand the settings better. With the present mode I'm using, it charges to 12.6v and stops flow of current. So perfect.
Meet my expectations

God bless you boss 🙏

1 Like

AdexAyanfe: 7:24am On Apr 03

ajabani4allah:

It seems this your PWM charge controller is different from regular ones. Does it allow setting of the charging voltage to align with voltage of the battery pack?

That PMW CC is an excellent PMW cc. Go for it, you'll enjoy it

dollarnaira: 7:26am On Apr 03

AdexAyanfe:

Boss, thank you so much for your kind suggestion. I finally got the BSC4048 scc and it has been performing excellently. I took my time to read the manual, then I understand the settings better. With the present mode I'm using, it charges to 12.6v and stops flow of current. So perfect.
Meet my expectations
God bless you boss 🙏

Great!
You are welcome.
How much and amp?

lowisz: 4:18pm On Apr 03

AdexAyanfe:
Please guys, I need your inputs 🙏
I've been using the common small blue pmw solar charge controller, but I have to hook up a buck converter to it as advisedby some here, just to monitor my li-ion battery voltage and ensure it doesn't go beyond 12.6. Because using my blue pmw solar charge controller, the lowest charge voltage is 12.7v, already above 12.6v.

Though beyond 12.6, the BMS will cut off charge in the long run, but I prefer it stops charging at 12.6.

Now what brings me here is that, I need advice on an affordable PMW solar charge controller that is effective, efficient and reliable for 12v Li-ion battery, such that I won't need buck converter to stabilise/stop charging my battery at 12.6v

@Tetralogyfalot
@OfficialFestus
@Intellab
@Okikisgm
@saint2ace
@Dollarnaira

And others🙏🙏

Come let me give u this for just 15k I only use it for a month already configured to work with lithium lion and lifepod4 and gel, fast pwm charge controller
Whats app 08053894585
Lagos,

Veew: 8:25pm On Apr 03

I need Help!
How do I stop reverse current flow into charging brick in a common port BMS like this please? 🙏 🙏

1 Like

dollarnaira: 9:01pm On Apr 03

Veew:
I need Help!
How do I stop reverse current flow into charging brick in a common port BMS like this please? 🙏 🙏

Cell configuration?

officialfestus(m): 9:03am On Apr 04

Veew:
I need Help!
How do I stop reverse current flow into charging brick in a common port BMS like this please? 🙏 🙏

get a diode to stop the reverse current, the diode is to be connected on the charger's output.

Veew: 9:30am On Apr 04

dollarnaira:

Cell configuration?

4S4P

Veew: 9:34am On Apr 04

officialfestus:
get a diode to stop the reverse current, the diode is to be connected on the charger's output.

The charger is 14.6v 10amp, What kind of diode can i use and where can I get it from please?

dollarnaira: 10:33am On Apr 04

Veew:

4S4P

Amp of each cell...

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