NewStats: 3,259,334 , 8,169,830 topics. Date: Saturday, 24 May 2025 at 05:42 PM 2c1r5m

saint2ace:


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

OK sir, thank you.

dollarnaira:


See this
24p3s

24 cells welled together in group of 3
Then series them positive to negative, positive to negative.

These lithium battery building is not a joke oh,

For me to get 100am I will need to have 30cell p
Then series the Best X4 making 120cell to get a 50ah... ohboi. No be small thing oh, that 120cell will atleast cost me roughly 100k without bms, casing, soldering and wire...
Times two of that cost for 100ah,,, ohboi

Binsule:


These lithium battery building is not a joke oh,

For me to get 100am I will need to have 30cell p
Then series the Best X4 making 120cell to get a 50ah... ohboi. No be small thing oh, that 120cell will atleast cost me roughly 100k without bms, casing, soldering and wire...
Times two of that cost for 100ah,,, ohboi

Old method : Soldering
New method : Spot welder ( fast)

Please where did you source for this charge controller?

officialfestus:
Completed

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.

Please how much do they sell this fan, and where in Lagos can I get it?

bashiruhammed97:
Please where did you source for this charge controller?

solar shops.

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..

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..

Great!
Keep on bro.

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.

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 ?

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..

Wow, just Wow!

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..

Where’s the inverter ? Did you build it yourself ?

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..

Two microcontrollers ( Esp01 and Atmega32 ) are used. The atmega32, though having a much less capable processing power does most of the job.. does all the job to honest, while the Esp01 collects data from the atmega, do some clean up and processing, then serve a browser/app/client etc.

Upon connecting an external battery, external battery mode can be activated manually, or automatically when internal battery gets low or fully charged or external battery sudden disconnect.. it's being tracked closely, you wouldn't even notice the switch.

Aside the external battery , similar board architecture as discussed previously for the the small power station.

Software:
Atmega32 - p
Esp01 - p/html/css/JavaScript(AJAX)

Find internal and final look below

saint2ace:


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

Thanks. The circuitry is very similar to previously described small power station. What's new is the external battery and comm via wifi. Two groups of mosfet switch between external and internal bus, and both never selected at the same or any time. A lot of care went into code and circuitry to make sure both never activates same time.. and if at all they do, physical safe kill activates. Interesting stuff I must say...

iraybuju:


Where’s the inverter ? Did you build it yourself ?

It's at the top right corner. Build myself? What part?

Queed:


Two microcontrollers ( Esp01 and Atmega32 ) are used. The atmega32, though having a much less capable processing power does most of the job.. does all the job to honest, while the Esp01 collects data from the atmega, do some clean up and processing, then serve a browser/app/client etc.

Upon connecting an external battery, external battery mode can be activated manually, or automatically when internal battery gets low or fully charged or external battery sudden disconnect.. it's being tracked closely, you wouldn't even notice the switch.

Aside the external battery , similar board architecture as discussed previously for the the small power station.

Software:
Atmega32 - p
Esp01 - p/html/css/JavaScript(AJAX)

Find internal and final look below

good job.

[quote author=dollarnaira post=135187546]

Very Yes [/quote

Are all these inverter boards really the actual rated capacity or half of it just like the sachets inverter whose continuous power is half of the rated capacity?

officialfestus:
solar shops.

Okay, thanks.

officialfestus:
50p 3s in progress.

completed added 30 more cells to make it 60p 3s

hybrid 2.5kw to 3.5kw inverter, which brand can be recommended? Need something rugged, durable and cost effective.

Machiny:
hybrid 2.5kw to 3.5kw inverter, which brand can be recommended? Need something rugged, durable and cost effective.

I know of SMS

iraybuju:


I know of SMS

do they have an official dealer?

moneymind:
4s 100amps bms available 19k. None smart.

08036761triple8 Benin

Two cworth 4s bms available at giveaway price

officialfestus:
completed added 30 more cells to make it 60p 3s

final look.

officialfestus:
final look.

Neat...
This is the real DIY

cutefy:


Neat...
This is the real DIY

thank you.

Hi all.
I have this set of battery cells from my lifepo4 pack for sale.
48 life cells in total.
Make me an offer.

Been just reading all your contributions here but couldn't respond because one useless mode ban me for 1 full month.
Will love to communicate you on WhatsApp if you wouldn't mind.

Your works are testament to your reality and honesty. Keep on keeping on

officialfestus:
final look.

psucc:
Been just reading all your contributions here but couldn't respond because one useless mode ban me for 1 full month.
Will love to communicate you on WhatsApp if you wouldn't mind.

Your works are testament to your reality and honesty. Keep on keeping on

thank you for the acknowledge, I really appreciate. 🙏No I don't mind.

Borgia1:
Hi all.
I have this set of battery cells from my lifepo4 pack for sale.
48 life cells in total.
Make me an offer.

these cells ain't lifepo4, they're Lithium-ion 18650.

Machiny:
do they have an official dealer?

Yes they have in Lagos

Borgia1:
Hi all.
I have this set of battery cells from my lifepo4 pack for sale.
48 life cells in total.
Make me an offer.

This can’t be lifepo4 cells oh Oga, show a proper and clear photo let’s see. Anyway I have sent you a message concerning the sale.