NewStats: 3,263,476 , 8,180,262 topics. Date: Friday, 06 June 2025 at 06:53 AM 6h5f6

HeavenlyBang:


The last lead acid 12v 7ah I bought from Jumia didn't even last two months before it stopped powering the fan for up to an hour.

Decided to never buy a lead acid replacement again.

I don't expect this to actually be 9.8aH, but even at 6aH or so I'd be satisfied.

That LA small size battery has horrible lifespan. Especially when you buy off brand. Branded type is often too expensive for an LA battery.

ola12:


Thanks. I'll rather go for a 1kva as I just need something strictly on a budget which'll do the job of supplementing my grid/replace it on off nepa days for powering my laptop+fan.
I was going for this one specifically but no felicity dealer has it in stock, if someone knows why or has used it with reviews please let me know.

If there're other really trusted 1kva 12v hybrid inverters I can get instead I'll appreciate the information

I have none. Try Welion

mctfopt:


That LA small size battery has horrible lifespan. Especially when you buy off brand. Branded type is often too expensive for an LA battery.

Even if you buy a quality one, e go still die due to the way the Fan operates. It's rarely gets charged completely. Couple that with the fact non Lithium batteries takes longer to full recharge.

If you want to enjoy the fan, and stop wasting money constantly changing batteries, either get a dedicated battery management system. You don't even need a BMS, just something that would cutOff at set voltage / current. That way the Fan would refuse working till the battery is recharge to meaningful extent.

Alternatively, buy a Lithium battery that's inbuilt a BMS, or if you don't wanna spend much, buy a very very cheap PWM charge contorller, and use the Load terminal - it would disconnect the moment the battery goes low.

You got numerous options, you just need think and make a decision

Ahyjo:
Please how genuine is this Valto guy ?

nothing to worry. we are tested and trusted
with a 16yrs old active no blemish nairaland ! we can waybill to any location in Nigeria and west Africa or u can also visit our office at no:29 ibusa road Asaba delta state.

HeavenlyBang:


The last lead acid 12v 7ah I bought from Jumia didn't even last two months before it stopped powering the fan for up to an hour.

Decided to never buy a lead acid replacement again.

I don't expect this to actually be 9.8aH, but even at 6aH or so I'd be satisfied.

This is why even a quality brand wouldn't last as expected.

You started using the battery from battery strength of 100% even when there's no NEPA light. After a while, NEPA / PHCN took the light and the battery is currently at 90%, then you ran it to 73% before they brought light again.
You started reCharging the battery, while using said Fan (hence recharging would be slower) and the battery moved from 73% to barely 78% before NEPA took the light again.
In your mind, the Fan's battery would have recharged to a large extent.

Give it a couple of weeks and despite being regularly plugged to NEPA, that battery would run to almost 5% which is low enough to slowly damage the battery.

---

Even if you buy a quality one, e go still die due to the way the Fan operates. It's rarely gets charged completely. Couple that with the fact non Lithium batteries takes longer to full recharge.

If you want to enjoy the fan, and stop wasting money constantly changing batteries, either get a dedicated battery management system. You don't even need a BMS, just something that would cutOff at set voltage / current. That way the Fan would refuse working till the battery is recharge to meaningful extent.

Alternatively, buy a Lithium battery that's inbuilt a BMS, or if you don't wanna spend much, buy a very very cheap PWM charge contorller, and use the Load terminal - it would disconnect the moment the battery goes low.

You got numerous options, you just need think and make a decision

HeavenlyBang:


The last lead acid 12v 7ah I bought from Jumia didn't even last two months before it stopped powering the fan for up to an hour.

Decided to never buy a lead acid replacement again.

I don't expect this to actually be 9.8aH, but even at 6aH or so I'd be satisfied.

if they ain't HONEST enough about the battery Amperage, what more of it's quality ?

If you can afford the stress, just buy a used Solar battery, buy a small Solar for recharging it. That way, during the day, most draw comes directly from the Solar . The battery would recharge, while acting as a noise cleaner / stabilizer.

Me no dey sell Used batteries any how Ooo. I use them in stages. Na when e no fit give anything again, I dey say market dey for used batteries.


If only the Fan comes with something to cut off when the voltage goes low, the battery's health would be saved. Just like they do in Mobile phones, Laptops, etc.


if you don't wanna stress your self, and want it mobile enough, and have the money, then you could look into Lithium batteries. Just ensure it's one with a BMS Ooo.

Back in the days when I was still a Windows Operating system , I built a huge battery bank using extracted lithium batteries. the capacity could power the laptop continuously for almost 2-days + BUT the laptop would still cry low battery the moment the indicator says 10%. Me just understood the meter gauge wasn't calibrated for the huge bank I built. I just went into task manager, looked for the software / driver controlling it (had to blindly keep disabling things till I got it), and disabled it. Na then the laptop come dey last wella.

brightk:
u just de run from pillar to post.buy ur battery from trusted sellers here n take some chill pills

...because too much being careful, without really knowing what you're trying to be careful from could make you end up making very costly mistake

Nteogwuija:


Thanks for responding. First, it's a 12v system. The array is 350w(x3).

Secondly, I'd assume the s are still in good condition cuz I still get around 73 volt from a possible 77.1 volt at times.

Also, it's a 2 storey building and the landlord doesn't like the idea of me having the s on the roof, so I had to make a stand and mounted it beside the house.

When I first installed it, the location it was mounted would get sunlight until it was 2PM. And I do get around 500w during those peak periods.

But few weeks ago I started observing that once it's 12PM, these days it's even worse - 11PM, the sun moves directly above the building, and then the building shades the sun away from the s.

And then the PV's production drops to around 100w.

something occurred to me this morning. it could be your Charge Controller playing games with you.

A charge controller that is lower than the load would seem to work well before 12pm when the Sun fully resumes duty. By the time the Sun light comes out fully, it would start fluctuating.

Check the display of the charge controller, observe the lights that blink, note if they suddenly starts blinking seriously, or those that were not blinking in the morning, suddenly started blinking late in the Morning / afternoon.

Also, you need tell us how you're able to come to conclusion of how much power was harvested

Haisic Almost ready..

https://www.youtube.com/watch?v=evYKaUTzE7w

Dam5reey1:
Haisic Almost ready..

0.13c recommended charge current and 0.25c recommended discharge are brutal.

HeavenlyBang:


0.13c recommended charge current and 0.25c recommended discharge are brutal.

wow , i have something very similar , it is 200A charge and discharge JK bms used

Valto:
wow , i have something very similar , it is 200A charge and discharge JK bms used

Well, obviously Haisic are using some really really cheap cells while you're not.

bassdow:


This is why even a quality brand wouldn't last as expected.

You started using the battery from battery strength of 100% even when there's no NEPA light. After a while, NEPA / PHCN took the light and the battery is currently at 90%, then you ran it to 73% before they brought light again.
You started reCharging the battery, while using said Fan (hence recharging would be slower) and the battery moved from 73% to barely 78% before NEPA took the light again.
In your mind, the Fan's battery would have recharged to a large extent.

Give it a couple of weeks and despite being regularly plugged to NEPA, that battery would run to almost 5% which is low enough to slowly damage the battery.

---

Even if you buy a quality one, e go still die due to the way the Fan operates. It's rarely gets charged completely. Couple that with the fact non Lithium batteries takes longer to full recharge.

If you want to enjoy the fan, and stop wasting money constantly changing batteries, either get a dedicated battery management system. You don't even need a BMS, just something that would cutOff at set voltage / current. That way the Fan would refuse working till the battery is recharge to meaningful extent.

Alternatively, buy a Lithium battery that's inbuilt a BMS, or if you don't wanna spend much, buy a very very cheap PWM charge contorller, and use the Load terminal - it would disconnect the moment the battery goes low.

You got numerous options, you just need think and make a decision

You just made up an entirely fictional use case here.

I use solar and I'm off-grid from 7 am to 9 pm every day. That's 14 hours of power, which is enough to charge a battery full.

Also, I live in a Band A area and there's typically power supply on 95+% of nights. The fan battery is massively understressed and mostly just exists to fill in the gap for the 1 or 2 hours in the middle of the night when power may go off. I definitely don't cycle the fan battery anywhere near regularly.

And yet it lost most of its capacity in a few months. I don't think I even cycled that battery more than four or five times before it died. It's just a shortcoming of the chemistry, since I guess the battery was in storage for a while before I ordered it

HeavenlyBang:


0.13c recommended charge current and 0.25c recommended discharge are brutal.

Those are recommended. And that's basically what you will do with the bundled 1.5kva inverter. It charges at max 60A..
And discharge is max 150A on point Sha.

Valto:
wow , i have something very similar , it is 200A charge and discharge JK bms used

Price?

HeavenlyBang:


You just made up an entirely fictional use case here.

I use solar and I'm off-grid from 7 am to 9 pm every day. That's 14 hours of power, which is enough to charge a battery full.

Also, I live in a Band A area and there's typically power supply on 95+% of nights. The fan battery is massively understressed and mostly just exists to fill in the gap for the 1 or 2 hours in the middle of the night when power may go off. I definitely don't cycle the fan battery anywhere near regularly.

And yet it lost most of its capacity in a few months. I don't think I even cycled that battery more than four or five times before it died. It's just a shortcoming of the chemistry, since I guess the battery was in storage for a while before I ordered it

of course it's FICTIONAL abi was I there to know exactly what might have occurred. I only pointed out a situation I believe is reason why a lot of ReChargeAble Fan's batteries don't live long

bassdow:
something occurred to me this morning. it could be your Charge Controller playing games with you.

A charge controller that is lower than the load would seem to work well before 12pm when the Sun fully resumes duty. By the time the Sun light comes out fully, it would start fluctuating.

Check the display of the charge controller, observe the lights that blink, note if they suddenly starts blinking seriously, or those that were not blinking in the morning, suddenly started blinking late in the Morning / afternoon.

Also, you need tell us how you're able to come to conclusion of how much power was harvested

@Nteogwuija , in other to be able to make a guess of what might be going on, let's take things step by step.

1. First show us the Sticker of your Charge Controller. The sticker is often attached to the device. We equally need to see images of the front and back of your charge controller.

Hopefully it's MPPT else that automatically is the issue. Even if it's MPPT, we still got to be sure it ain't a glorified one

Valto:
nothing to worry. we are tested and trusted
with a 16yrs old active no blemish nairaland ! we can waybill to any location in Nigeria and west Africa or u can also visit our office at no:29 ibusa road Asaba delta state.

Do you have Welion hybrid inverters? What are your prices for the 1kva 12v, 1.5kva 24v and 1.6kw 12v?

Gshems:
Are you using an mppt charge controller or a glorified pwm?
Are you sure your ain't fake?

My guess is that you bought fake . s that are not up to it's rated capacity.

No matter how bad the shading can be you shouldnt be getting 100watts from a 1050 watts .. If you have the picture of your charge controller and your s, post them here.

Attached is an image of the charge controller and solar . I unmounted the s for repositioning.

bassdow:

@Nteogwuija , in other to be able to make a guess of what might be going on, let's take things step by step.

1. First show us the Sticker of your Charge Controller. The sticker is often attached to the device. We equally need to see images of the front and back of your charge controller.

Hopefully it's MPPT else that automatically is the issue. Even if it's MPPT, we still got to be sure it ain't a glorified one

590w Jinko Solar
New
#135k

Growatt 5kw Hybrid inverter
New Sealed (receipt)
#570k


Pickup in Ilorin
0 9 1 1 3 2 0 5 4 4 9

mctfopt:


I have none. Try Welion

I'll make my research on this. Thank you

chris81964:

https://www.youtube.com/watch?v=evYKaUTzE7w

Hello Dr Solar, that thing at the centre of the pipe that I'm seeing is it the earth rod?

Using pipe is a cool way of running earth. I even saw one, at one flow station, where the pipe is galvanised steel.

mctfopt:


Hello Dr Solar, that thing at the centre of the pipe that I'm seeing is it the earth rod?

Using pipe is a cool way of running earth. I even saw one, at one flow station, where the pipe is galvanised steel.

Yes it is. We have been doing this for years.

Akaza:
590w Jinko Solar
New
#135k

Growatt 5kw Hybrid inverter
New Sealed (receipt)
#570k


Pickup in Ilorin

Your number isn't on WhatsApp.
How do I get in touch?

chris81964:

Yes it is. We have been doing this for years.

I like this. Getting the soil wet for lower resistivity is easier with this technique.

LVTOPSUN....

Quality cells and pack dey Naija..

obinna37:
Flash sale

EAsun power puresinwave 4000w inverter continues power is 2500w) it can power your fridge or freezer and others

Owner is upgrading

Price #120k fix

08034034206

still available

numericalguy:


I know what a relay is. I have a first degree in Electrical engineering and masters degree in Telecommunications engineering.

Hey bro sorry I saw your message very late I also studied elect/elect but that aside you need at least 2 big relays, a transformer 12v, and a rectifier(full wave) you need it to keep one of the relays on standby so that it will not jam with the dc voltage from the inverter, it’s just a logic application it’s simple once u know it

HeavenlyBang:
Replacement battery for rechargeable fan. 14.8v 9.8aH li-ion.

Will provide updates if/when I receive it.

Got this on Jumia. It quotes 8.4ah. Waiting to test once it arrives.