₦airaland Forum

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Yinkame123:
Bros i dey PH too and would like to have this can you please direct me where you bought it? Does the man sell smart charger as well? Regards

Where in pH ?. The shop is at ogunabali, garrison side. The name of the shop is sunny best or you can also buy from simba solar too. Not sure of the smart charger, but there are other shops there or you can also check mile 1 side too.

Anybody in the house using these cheap 1000w car inverter ?. What's your experience with it ?.

timifakay:
So far so good, everything is working perfectly, I believe the charge controller is MPPT as stated on the carton, I don't know what type of test I can carry out to confirm.
The inverter automatically stops supplying power and the fault light starts blinking anytime you overload, it then rectifies after disconnecting the overload and restarting the inverter itself.

okay, thanks boss. How long does your battery (200ah) take to charge ?. I read somewhere that u can confirm if its an mppt by comparing the current or with the performance of a pwm.

timifakay:
Cost analysis: 200ah Leap Power Battery- 45,000
200w Solar panel- 40,000
12v 30a Charge Controller 17,500
1000w Inverter- 8,500
10 Yards 2-core cable- 6,000
Cable clips- 100
Taxi charter- 1,500
Tips- 200
Transportation to the market- 190
Carpenter- 1000
Total-119,990

boss,
Is that inverter still working/serving you ?. Any issues with it ?. Your mppt charge controller price is great, did you test them to see if they were truly mppt ?. Thanks

timifakay:
35vmp is voltage at maximum power, not the operating voltage, so I'm guessing it's a 24v panel.
Two batteries in series should perform well, the best charge controller is MPPT, and get a 24v type UPS to serve as inverter.

thanks boss. I think its best I go with mppt, rather than getting half of my panel power. Mind sharing your current solar setup and how much it cost ?

mukhcech:
for the same price?

yea

timifakay:
Good decision. What's your battery bank rating?

haven't gotten yet. Am thinking of buying two 50ah 12v battery and then connecting them in series. My reason/main concern is that the panels have a voltage (vmp) of 35v and from what I read online, cheap pwm controller can not fully utilize that much voltage for a 12v system (only mppt). So am considering building a 24v system (inverter, controller and battery). What do you advice ?.

Cc: Ceejay, other solar gurus

mukhcech:
It is fair, Buh they are not new. Hope they were tested okay sha.

changed them to a brand new 200 watt mono panel.

My apps on playstore:

https://play.google.com/store/apps/developer?id=MobyMagic

Contact me (call): 08084848093
Whatsapp: 07061317103

mukhcech:
How much are they?

45k

@valto, I am interested in your 30amps controller. I stay in port Harcourt. Will like to get it next week. Drop ur phone number or call me: 08084848093

Finally got my solar panels. 130w poly (x2). Anybody here staying in port Harcourt that need solar/inverter stuff should go to mile 1 or ogunabali. I bought the panels from sunny best at ogunabali.

The only issue I have is, the frames (edges) doesn't look really neat like the panel face. Does this mean the panel have been used before or its normal. Please my ogas in the house, I need your replies.

officialfestus:
Just a friend of my bought it from jumia last two months it came with 6month warranty and working fine he used it with car battery and it last longer.....bcus it consumes less current from the battery,it has a cooling fan and it does not have an inbuilt charger planing to get one soon....

please sir,
Could u provide the link ?. On Jumia.

officialfestus:
You can order online @,a 1500va car inverter goes for 9k in konga 12volt input,220volt ac ouput,820watts,try 9ja style cut the cigeratte plug and connect to ur battery

oga festus,
Will like to know if you have used or have any experience with any of those 9k inverters on konga ?

Valto:
i bought my 2pcs of 200watts SUNSHINE SOLAR panel 35k each at alaba int lagos. within a month interval. However i dont think it will still go for the same now, but u can call my supplier, he is the direct importer. dont be afraid transact with him, he can easily send it to ph, the same way he sent mine to Bayelsa.

Thanks sir.

officialfestus:
You can order online @,a 1500va car inverter goes for 9k in konga 12volt input,220volt ac ouput,820watts,try 9ja style cut the cigeratte plug and connect to ur battery

Thanks bro.

Valto:
lol, off grid ke when i av just 2pcs 200amps batteries and 2pcs 200watts panel.. phcn and gen still used occasionally, infact still important.

oga valto. Will like to know how much you got the 200watt panel ?. Shops i asked, say their 100wat goes for about 30k, just want to confirm. I stay in port harcourt. Thanks

Will also like to know where to buy the solar items online or in port Harcourt ? Want to use konga, but will appreciate a cheaper alternative. Thanks.

Hi solar gurus/users,

Am thinking of building a cheap solar system with the following:

1) a 100 watt solar panel
2) 100ah battery (or less)
3) 500w inverter
4) charge controller (the cheaper ones).

My budget is about 60k and I only want to charge a laptop. I need advice on the setup ? Things I can add or remove ? And how long will it take to charge the 100ah battery (estimate).

Are they still available ? Tried calling but ur number is switched off

BizBloke:
[color=#000033]Got you, Elvis10ten.
I'll get back to you.
Thanks[/color]

ok, waiting.
Thanks boss

BizBloke:
[color=#000033]Hi Elvis10ten,

I remember all my clients from day zero till date. Welcome back.

Could you be more specific with the details of what you need - a solar system or a laptop solar charger?[/color]

.

I just need something that can charge a laptop and is affordable. Solar laptop charger or solar system any one, as long as it works. Budgeting: 30k to 50k

Hi bizbloke, long time. I dont know if you remember, but am the guy that bought a robot kit some years back. In this buhari, am in search of a good cheap solar system that can charge at least a laptop. Nothing more. Don't know if you have or know of any and the price + shipping

My flight from port harcourt to lagos on 21st April 2016 was cancelled because of operational issues (by Arik Air). I have sent them several mails since then to refund my money but up till now no refund. No response from them too. Please epp.

Have they uninstalled zapping from their system ?

This year JAMB introduced the Item Response Theory (IRT) which they said would reduce guessing. This sparked some questions about how it works. I will attempt to answer all questions i have seen on Nairaland. Feel free to ask more questions.

What is Item Response Theory:
Item Response Theory posits that the probability of a random person (P) with an ability (A) answering a random question (Q) with difficulty (D) correctly is conditioned upon the ability of the person and the difficulty of the item. In other words, if a person has a high ability in a particular field, he or she will probably get an easy question correct.

How does it work:
The student is asked a question of moderate difficulty level and then if the student answers this question correctly, the next question is more difficult. If that question is answered incorrectly, then the next will be easier.

How is my score calculated
Your score depends on how many questions you answered correctly and the difficulty of the questions.

How can it stop guessing
This is a question everyone was asking. I have a short and a long answer. The short answer is: No, it won't stop guessing. A multi-choice test answers will always be guessable. The long answer is: Yes, it can reduce the success rate of guessing. Here are some ways:

- Some question correct answer are easily guessable. By eliminating irrelevant options. IRT funtion(see below) takes into account item guess-ability and can offer better questions.

- Correct guesses will take you to places you can't maintain. Remember, the more correct answers the higher the difficulty. You will (might) end up falling back to your real level (score).

Any benefits:
- Take less time
- Give more accurate score
- Enjoyable by students (You get questions that you have about 50% chance of answering)
- Student are not presented with the same questions (Reducing collabo with neighbors as the way you answer questions will be different from your neighbor).

The Future/Challenges:
The major challenge will be properly calibrating questions (their difficulty, guess-ability, etc). It takes time and IRT soft-wares are expensive. This year, I believe JAMB didn't fully use IRT, but in the future (from next year), I believe it will be used throughout as they have gotten feedback/data this year and have much time to fully refine it.

The IRT formular:
The item response function of the 3PL model is:
https://upload.wikimedia.org/math/e/e/c/eec40807bfbdd7cfd43c8957a91fef91.png
b – difficulty, item location
a – discrimination
c – pseudo-guessing

How do I Prepare for Exams Now:
CBT apps and some textbooks will be less effective in preparing you for JAMB.

We have built a personalizing learning platform that is based on the same IRT software JAMB uses and will be launching it soon. It provides adaptive lessons that adapt to your level and the way you learn best. It like no other exam preparation app in Nigeria and will be a direct alternative to JAMB lessons.

We will be offering it for free to our first 100 users from Nairaland, so hurry now and register:

http://prepup.co

cc: lalasticlala, abdulahi001