₦airaland Forum

dollarnaira:
Yes!
12.6v is the full charge voltage. It will stop charging at this voltage. Didn't look at your diagram well before I pushed in my thoughts.

Buck 5a
Cc 20a

Do the Math

Thanks boss. The buck converter module works so well. I went for a buck converter above 5a. I will consider a better pmw or even mppt when I'm upgrading to a bigger set-up. Thanks boss. I appreciate everyone.

Penuelseun:
Yes, you just have to set your buck converter output voltage to around 12.7v, using a pwm charge controller that can go as low as 12.6v is still your best option, any of these controllers supports 3s lithium charging

Thanks so much everyone. I hooked up a buck converter to my cc, and since then, my battery has been perfectly charging well. Never charging above 12.6v.
I really appreciate everyone. Thanks for all your inputs 🙏

Penuelseun:
Have you connected it this way before? Buck converter between panel and cc was how I connected mine and it worked perfectly

You mean this connection will successfully prevent the battery from hitting above 12.6v like this?

But with the PV going into the buck converter input, will the out still remain pegged at 12.6v even when the PV input voltage fluctuates due to different intensity of the sun at different times? Or will the output remains unchanged at 12.6v nevertheless?

dollarnaira:
We are here to learn. If the buck of 5a is in between the pv and cc the the purpose of the cc is defeated esp if the cc is of greater amp than the converter which it is in this case.

The converter here prevent the battery from hitting above 12.6v.

You mean this connection will successfully prevent the battery from hitting above 12.6v when connected as illustrated below?

But with the PV going into the buck converter input, will the out still remain pegged at 12.6v even when the PV input voltage fluctuates due to different intensity of the sun at different times? Or will the output remains unchanged at 12.6v nevertheless?

Penuelseun:
not correct, you place the buck converter between the panels and the charge controller not between battery and charge controller

Something like this?

Penuelseun:
what is the size of your solar panels as a 5a buck converter is small for panel sizes over 80w

My panel is 50w boss

dollarnaira:
It is correct.
How big is your battery?
If not very big and panel's voltage not higher than the converter's max, the buck converter can work without the cc after editing to 12.6v. Try both out to make the best choice.
What is the wattage of your pv (panel)?

A very small heat sink is missing in the converter.

Thanks boss.
50w panel.
Do you mean as illustrated in my diagram below? Like I should totally bypass charge controller?

dollarnaira:
Will suggest you DON'T OVER LABOUR your cc. Get an edible pwm or a 5A buck converter if on a tight budget. Protect your battery via these b4 u pass it via bms. Protect! Protect!! Protect!!!

Okay boss. Thanks for your response.
Yeah, I have a 5A buck converter.
Please is the wiring illustration to connect the buck converter correct boss?

Wizyoung:
By "CC", I think he meant your PWM charge controller.

The CC is simply your charge controller (PWM type) in the picture you uploaded. That device is your CC

He's advising you to get an MPPT charge controller so you could replace your current CC (which is a PWM). The reason for replacing is so you could set your max charging voltage to 12.6v on the new MPPT charge controller

oooh...thanks boss. Now I get it 👍
I thought he was referring to buck converter. To peg the voltage at 12.6v
CC- Charge Controller 👍...Understood. thanks

saint2ace:
Your system is working as it should based on parameters of both the charge controller and the BMS, you didn't (can't) adjust the parameters on Ur CC as it is set for lead acid battery at 14.4v, while Ur BMS is locked at 12.6v (which is the verified safe working voltage for 3s lithium ion battery packs).
So while the CC tries to get to 14.4v the BMS clips it at 12.6v the reason the reading after the BMS is 12.55v which is less than 12.6v.
The increase in voltage when load is applied is that the inverter is pulling direct from the CC and since it can do higher than 12.6v, it would naturally increase, and the fluctuations are due to the solar fluctuation due to cloud covers.
For optimal use, get a CC with adjustable settings so you can set Ur voltage at 12.6v max and stop clipping on Ur BMS or else you might fry Ur BMS and in turn Ur CC. Cheers

Thanks for your response boss. I have a question though.
Going by your response, the CC will peg the max voltage at 12.6 right? If so where will I hook the CC.
For the part of "Stop clipping on ur BMS", is it at the solar input or battery input on the pmw the CC will be?

taiwooguns33:
nothing to worry about my setup has been like that for almost two years now, since bms cut it off at 12.6..

ooooh...wow. Alright boss. Thanks 👍

Penuelseun:
what setting did you set as your maximum charge voltage on your controller? The bms over voltage protection is coming up thereby causing voltage fluctuations

12.7v. That is the lowest the pmw could be set to.

Obnoxious2001:
Definitely it's a charge controller issue.

I have an issue like this on ground.
I am thinking of a way out( I think it happens mostly on this pwm controller reason is you can't set it) if you find solutions let us know

I guess as much, cus the lowest float voltage is 12.7v on the pmw and it will rather keep pumping up the voltage unless bms cut it off. Probably some other different pmw does better at that.

dollarnaira:
Issue with bms.

Oooh...I'll check it again boss. Thanks

dollarnaira:
Brand new?

Please what's wrong with my setup. I've presently assembled 3S3P li-ion battery( while waiting for more batteries) with 3S 40A bms, with the cell all balanced. But anytime its fully charged to 12.6v (I'm only charging solar for now), the voltage then start fluctuating at 13.8v, 13.9v, 14.1v.
But when I checked the actual battery voltage (bypassing the bms) I noticed charging has been cut off and it was around 12.55v then.

But anytime it starts fluctuating due to charging disconnect, once I put a reasonable load on it, it adjust itself and displays 12.6v.

Please what could be the issue, I've tested 2 3S 40A bms, it's the same.

Could it be my solar charge controller

@dollarnaira @penuelseun @officialfestus @everyone

officialfestus:
flat head.

Okay. Thank

Penuelseun:
flat heads are the way to go, search for tetralogyfallot and contact him if he still has li-ion cells for sale

Okay boss. Thanks, I've contacted him already.

Please gurus in the house, I have 2 questions.
1. I'm trying to build a lithium battery pack. Can I use button head 18650 lithium batteries, or only flat heads are acceptable?

2. Where can I source good lithium battery please? I'm based in Ilorin.

@dollarnaira @penuelseun @officialfestus @everyone

isangjohnson:
I think there is someone in this forum that sells lithium ion cells

Who please?

Valto:
contact him
https://www.nairaland.com/tetralogyfallot

Thanks boss

ksmart027:
Post your question on lithium ion thread, it will be attended to you immediately. Cc dollarnaira, penuelseun, officialfestus

Okay boss. Thanks. I'll do that.

HeavenlyBang:
Well, what you want is an inverter + battery.

Get a hybrid inverter of your choice.

Get a DIY lifepo4 battery from isangjohnson or Valto.

The specifications of both will depend on your load and how long you need the battery to last.

Please gurus in the house, I have 2 questions.
1. I'm trying to build a lithium battery pack. Can I use button head 18650 lithium batteries, or only flat heads are acceptable?

2. Where can I source good lithium battery please? I'm based in Ilorin.
@Valto @isangjohnson @everyone

isangjohnson:
For the number 2 question, are you looking for lithium ion or lithium phosphate?

I need Lithium ion

Please gurus in the house, I have 2 questions.
1. I'm trying to build a lithium battery pack. Can I use button head 18650 lithium batteries, or only flat heads are acceptable?

2. Where can I source good lithium battery please? I'm based in Ilorin.

Broskyjames:
I will try to explain as simple as possible. In the hale days of Meffy at the helm of CBN, through some bad economic projections, him and PMB assumed the naira to be "461 to the Dollar", Hoarders and friends of Meffy had a field day, they were able to get the dollar at the CBN rate of $461 and sell on the black market for around 550 (2017) before it steadily rise to the about 780 it is today. These actions spooked the market. Genuine investors didn't get these dollars for investment at CBN rate because of these "Special friends", and they took thier investment elsewhere. Some Industries like Airline who brought in forex at black market rate where told to collect back their forex at CBN rate, which meant instant loss and so i know a particular airline who has about $800m trapped here because of this!.

As the years roll by and as Meffy and PMB continued the charade that the naira was trading at "460" to the Dollar, it became evidently clear that CBN had no forex to keep up with this charade, and so so restrictions and plans were kicked in motion to arrest the situation. First was the famed reduction of Forex debit on Naira cards, it was reduced to $100 per month, $50 dollars per month, to even $15 per month! before they basically just cancelled forex debit on Naira dominated cards. A little detour, That time you could use your Naira card to shop on AE, what happens is that you pay in naira to your Bank, your Bank pays AE from thier own Forex reserves, as the forex got depleted, that why they stopped it. The only way now is to bring in your "own" dollar physically and that's where dom account and Dollar card comes in.

Let's continue, CBN even started forex promo! They advised people to bring thier dollars for a discount, i think it was $5 and get $1 discount, and still the Naira and Forex balance never recovered because people knew that the Naira was on life support.

On May 29th, 2023, Tinubu on his inaugural address, stated a plan to "float" the Naira, and the first step was to get rid of Meffy, which he did last Friday. And so today's announcement, means the forex market is an open field for all, no more CBN rate, instead you have something called "Unitary rate" meaning the CBN rate and black market rate are one and almost the same determined by market forces. It opened the forex window for banks to trade the dollar at any rate as determined by these forces and source it from anywhere. Meaning if a bank is offering me dollars at 700, the black market offering me at 780 will have a rethink, and push thier own prices down in a direct competition with the banks.

What it means for you and i is that, the beginning will be very rough but it will pay off in the end, the reason why most Virtual Dollars are down now is that they want to see how the market will react to these announcement and projection are the dollar might trade between 800 and as high as 1000 naira in the coming days!. The country's forex reserve is almost next to zero, It is the hope that the announcement will encourage investors to bring in thier forex without fear of it been trapped at "CBN rate", other forces will come into play too i.e like the gains of the subsidy removal etc. Steadily these will balance the forex and naira trade driving the exchange rate back to a favourable rate and who knows the bank might even announce a return of forex debit on Naira cards in the coming months....fingers crossed.🤞

The idea is working already...it will favour us greatly by God's grace 🙏

sunrise12:
I saw this laptop on Aliexpress with the brand name PIPO and I was wondering if anyone here has ever come across their product before.

Oga, check the cost in dollar not naira ooo. Should incase you really want to go for it, so as to know the 'true cost' based on naira-dollar rate

dollarnaira:
Is there no window and fan?
Stand fan preferably.

There's a ceiling fan, and a window. There's AC as well, only used when there's power supply.

My people please I need your advise on this inverter setup in a small office and the administrative assistant sits very close to inverter setup. Is it healthy... considering possibilities of radiation and emission of acidic gases. The person sitting besides it do complain of headache most times and heat. 4 tubular batteries were used with 2kva Pure sine wave inverter. Please I will really appreciate your response.

My people please I need your advise on this inverter setup in a small office and the administrative assistant sits very close to inverter setup. Is it healthy... considering possibilities of radiation and emission of acidic gases. The person sitting besides it do complain of headache most times and heat. 4 tubular batteries were used with 2kva Pure sine wave inverter. Please I will really appreciate your response.

Please how can i make a payment of $109 on Aliexpress, as the limit on our debit card is $20 monthly.

Please how can i make a payment of $109 on Aliexpress, as the limit on our debit card is $20 monthly.

Please how can i make a payment of $109 as the limit on our debit card is $20 monthly.