rhosymedre:


Wow wow wow! I'm thoroughly and totally blown and I am truly and deeply very grateful

The thing is that from what I have read here my understanding was that 2x200ah Lifepo4 (of the spec you've used i.e. 48v if I recall correctly) is a better option than a single 7.5v. I was therefore surprised when the installer suggested the single 7.5 over the two 2x200s.

I am now going to calmly and carefully go through your incredible post for better understanding as part of my research ahead of choosing/agreeing the system. I am truly very very grateful once again .... but don't be surprised if I come up with more questions or seek further clarification in the next few days please.

Thanks again.

@GloryJoyeux (and at all)

I've been carefully reading through that your great post and picking things and, like I said, with questions to follow.

So my first question/s please:

Assuming I stick to a 5KVA inverter, will a 24v system (instead of 48v) work and, if so, will a single 24v 200ah and 5.12kvh Lifepo4 battery work; and, assuming I want to use two 24v 200ah and 5.12kvh Lifepo4 batteries, will the system need to change to a 48 v system?

Thanks again.

bassdow:


Mentioning appliances such as Fridge or Freezer, or even Pumping machine, without mentioning their capacities means we either make guesses or give information that could end up being wrong.

We don't even know if your pumping machine is surface or submersible, let alone knowing it's capacity.

Even TV's power rating needs be stated as I have seen TVs that consume power like community cinema.

At end of the day, a larger battery bank would always server better than a smaller one irrespective of the number of units. In other words, 2pcs of 12v 200AH battery would always out perform 1pcs of 200AH battery all things being equal.

Now you probably are comparing 2 types of batteries => Lithium and Tubular/GEL/AGM batteries. Just understand that quality Lithium batteries gives much more power than Tubular/GEL/AGM of comparable capacity.

Note: I didn't just say Lithium battery is superior BUT I said Quality Lithium  battery

Major advantage Lithium technology has over Tubular/GEL/AGM is, you could run Lithium batteries lower (though help if you don't) BUT for the likes of Tubular/GEL/AGM batteries, you need ensure you don't run beyond 50% of it's stated capacity else it wouldn't be there to serve you for long.

NB: A lot of us want to quickly respond to comments and get on our way. Abeg no give us reason to stress our brain unnecessarily.
Consuming information such as "2pcs of 12v 200AH battery" is much quicker than saying "4.8kwh" BECAUSE we have to mentally do things such as convert 12-volts 200AH to kWh i.e; 200AH x 12v = 2,400 watts ÷ 1000 = 2.4 kWh

Anyway sha, the 2pcs of 200Ah batteries is much smaller and wouldn't last long in terms of years.. You would have better luck going with the 7.5kwh battery so long it ain't over-rated or low quality.

Once again, the above information could be wrong as capacity of the appliances especially the Fridge , Freezer , and Pumping machine weren't mentioned. Didn't even ask how long you intends powering them daily sef.

Thanks sooo much; I'm truly grateful and will be studying this your post further as part of my research. Thanks once again.

GloryJoyeux:


Hello,

When sizing your system an energy consumption audit is one of the most crucial steps. I can see that you also listed the electrical loads you intend on carrying in a latter post. Although this is different from a comprehensive energy consumption audit, I will work with that figure.

Firstly, you must understand there is always a strong tendency to improve on a solar system after it has been installed so a lot of folks just go big from the get go if they are able to afford it.

A crucial question is: are you sure you really do not ever want to run that air conditioner? I’m asking because it seems like you really want it included, but the truth is, if you want it down the line, you will have to upgrade your system. Now, the ability to upgrade your system down the line is also a major advantage of residential ess, it means you can do what you can afford now and with time get to were you want it to be.

Answering your questions:

I will assumes you are comparing 48v batteries because using a 7.5kw inverter with anything less than 48v batteries system is poor design choice.

Battery size : Two paralleled 200ah battery is 51.2v x 400ah = 20kwh. That is over double the capacity of a single 7.5kwh battery. Both of these can power your air conditioner and other systems mentioned during the day with your 7.5kw inverter. However, at night, if you use the air conditioner with the 7.5kwh battery, you will quickly run out of stored energy. But the 20kwh battery will be more than enough to run your ‘inverter’ air conditioners over night.

By now I’m sure you are understanding the concept? Bigger batteries mean more energy stored for when there is no sunlight, it means longer run time of electrical load and means an extra day or two of autonomy.

Days of Autonomy : this is also a major factor when designing systems. In Nigeria right now we are at the raining season and this means poor solar yield. You therefore need to design a system that can go through at least a day of poor solar yield i.e. a full raining day where your batteries would just add 10 percent charge.

The larger 20kwh battery will enable you to plan 12kwh for the night, and the balance 8kwh for the next night incase there is poor solar yield due to rainfall.

The 7.5kwh battery means you will have to plan 4.5kwh for the night and 3kwh for the next night incase of poor solar yield.

Now, it all depends on energy consumption. Someone might be very okay on 7.5kwh inclusive of days of autonomy, while another will be okay with 20kwh, some have up to 90kwh as home ess.

Solar generation : I see you listed 4 units of 580w solar panels. This is 4 x 580w =2,320 W. Now, you must understand that you will hardly get a sustained 2,320w of solar yield. Always aim for 90 percent solar yield which is 0.9 x 2320w =2,088 W. Now you must consider inefficiencies when converting current and voltage to charge the batteries. Expensive inverters and solar charge controllers like those made by victron offer way higher conversion efficiency. But, most cheaper inverters we use offer poor efficiency. So let’s go with 85 percent conversion efficiency. We have 0.85 x 2088w=1,774.8 W. Since you battery is 51.2v, it will charge at average of 53v so we have, 1,774.8w / 53v = 33.4 amps.

Take note of the figure 33.4 amps. If you go with the 7.5kwh battery which is 150ah. It will take up to 150ah / 33.4amps = 4.5hrs sunlight to charge. Now notice if you go with the 20kwh battery which is 400ah it will take up to 400ah / 33.4amps = 12hrs sunlight to charge

This above is only accurate if you are not running a single day time load. Once you are running a load during the day eg your freezer is turned on. Then, your 1,774.8w from solar panel will need to power those loads first, before sending the balance to the battery, meaning you will be looking at 27amps or even just 25amps charging current.

Now, not all sunlight is equal. Just because it’s daytime doesn’t mean you will be generating such high sustained figures. For a fact, you can only expect such sustained performance all day only during the dry season in the south, except you are living up north in Nigeria.

We can therefore conclude that your solar panel is completely underpowered.

How to size your solar panels : I will give you my personal calculation that works for me always. If you are resident in the south of Nigeria, size your panels to fully charge your batteries with just 1.8hrs of sunlight i.e 1hr 48mins of sustained peak solar pv should charge your battery to full. If you are in the North use 2.5hrs of sunlight for your calculation.

This means that, to size your panels divide your total battery capacity by 1.8 if you live in the south and 2.5 if you live in the north. So 20kwh battery / 1.8 = 11,000w total panels and 7.5kwh battery / 1.8 = 4,160w total panels.

I can assure you, if you size your panels this way and factor in days of autonomy for battery size. Come rain come sun, out of 365 days a year, you will always get full charge for a minimum of 340 days. The remaining less than 25days which translates to 4 times a month in the rainy season, you can expect minimum of 50 percent charge.

Regarding questions 2 and 3. Do not buy from some alaba marketers, to be safe just go straight to their official distributors and buy from them. I have seen situations where they print new stickers with higher capacity and paste on their batteries to deceive unsuspecting customers. Do you research and ensure you purchase from the right source or you will not get value for your money. For the inverter part, you can maybe google search the name of the inverter and add words like ‘repair’ , ‘fault’ , ‘common issues’, ‘problems’ and see if you can find any known issues documented online. This is a neat trick for researching any electrical device you intend to buy.

*sorry for any typos, I didn’t proofread this.

Wow wow wow! I'm thoroughly and totally blown and I am truly and deeply very grateful

The thing is that from what I have read here my understanding was that 2x200ah Lifepo4 (of the spec you've used i.e. 48v if I recall correctly) is a better option than a single 7.5v. I was therefore surprised when the installer suggested the single 7.5 over the two 2x200s.

I am now going to calmly and carefully go through your incredible post for better understanding as part of my research ahead of choosing/agreeing the system. I am truly very very grateful once again .... but don't be surprised if I come up with more questions or seek further clarification in the next few days please.

Thanks again.

HeavenlyBang:


Lifepo4 batteries are built for different voltages, unlike tubular that's only in 12v. You have to be more specific than "2x200ah".

A 12v 200aH Lifepo4 battery is 2.56kwh
A 24v 200aH is 5.12kwh
A 48v 200aH is 10.24kwh

I'm very grateful; I'm going to go and use this to study/research further before I commit with the installer. Thanks again.

bassdow:

These should do. Guess the pumping machine is between 0.5, 0.75 and 1HP. Probably run the heavier items during the day

Thanks again, appreciated.

I will still be grateful for further input especially on this issue: " I am confused whether 2 x 200ah Lifepo4 will be enough or whether a single 7.5kwh Lifepo4 battery is necessary ...."

bassdow:


Would be much helpful should you list what appliances you intends powering

Many thanks for reply.

For now we have decided to exclude air conditioners; so, something like

* 1 medium/large TV e.g. 40 inches and 4 small TVs of 24 inches each
* 1 standard fridge (nothing big) and one small deep freezer
* 1 water pumping machine
* About 8 standing fans (will go for low power consuming fans)
* All electric bulbs in a 5 bedroom house

Thanks again.

Hello everyone, both expert contributors and all others.

I have been quietly reading here for some time to learn more. I would be grateful for your help on one or two things.

1. What really is the capacity of a 200ah Lifepo4 battery? We are planning a system, excluding air conditioners, with four 580w Jinko panels and a 7.5kva Inverter; I am confused whether 2 x 200ah Lifepo4 will be enough or whether a single 7.5kwh Lifepo4 battery is necessary as someone has suggested to me.

2. Please advise on whether the Felicity Lifepo4 batteries are reliable.

3. Please advise on whether the Felicity 7.5kva transformer based inverter is reliable.

Many many thanks in advance.

rhosymedre:
Grateful if anyone remembers and/or knows the title of a song (maybe by Alex Zitto or Alex O or someone like that) that included the word 'ochongologo'?

Would be grateful for any info, thanks!

Found it!

Chris Mba - Ogechi (God's Time)


https://www.youtube.com/watch?v=lvQxml7lNmo

Special FYI naptu2

Professor Akin Oyebode

“I think it’s a sad day for Nigeria, because you don’t break the law in order to implement the law,” said Mr. Oyebode.

“Which is what the DSS seem to be saying, that because of the inaction or lack of cooperation by the NJC they had to resort to self-help.

“In fact, my gut reaction is that this might be the handiwork of fifth columnists, those that want to do in the government of Buhari.

“I’m not sure a Buhari who has touted himself as a born again democrat, welded to the notion of rule of law will authorise the outrageous act by the DSS.

“So either some people…misguided…who want to impress the powers that be by their work decided to go for broke in that respect. And I think it should be deprecated because there are so many rules of law that have been breached.

“And their subsequent comments, almost trying to try the accused in newspapers and what have you, because the accused have presumption of innocence and the onus of proof is on the state, and the onus is proved beyond reasonable doubt.

“You had given the impression that you have basis and reasons for what you did and you have not ensured that the public hears the side of the arrested persons, which is unfair.”

Mr. Oyebode said under the Nigerian Constitution, the task of discipline in the judiciary lays solely with the NJC who investigate and isolate the judge if found culpable.

“Now having separated the judge who had been found wanting in terms of his calling and judicial oath – you know there’s a judicial oath that judges swear when they are appointed, to do justice to all manner of persons without fear, affection or ill-will to be very neutral, non-partisan, fair to everybody, and not bend the scales of justice in favour of any accused person. That’s the judicial oath.

“So if any of them is found to have violated that oath, definitely he should be removed from the judiciary. The removal from the judiciary will lay the foundations for trial for any criminal act, say bribery and corruption .

“But the way things turned out, the DSS is the accuser, the jury, and almost the executioner. It’s not done.”

http://www.premiumtimesng.com/news/more-news/212535-law-professor-oyebode-criticises-sss-arrest-judges.html

Prof Bankole Sodipo, said:

“I am against corruption and corrupt judges but I am against the manner the judges have been treated.

The rule of law is a safety valve.

No investment takes place in a country where the rule of law is not respected.

Leaders who do not respect the rule of law often become despots.

Buhari was once a despot. We must oppose the agencies that are depicting Buhari as a leader that has not changed.

I voted for Buhari, who vowed he is not that same person who ruled us a little over 30 years ago with Decree 4 and fear. I implore Buhari to dispel this fear as Idi Amin started like that.

Once the judiciary is ridiculed, the last hope of the common man is gone. Let us follow due process.’’

http://www.vanguardngr.com/2016/10/crackdown-judges-sad-regrettable-cjn/

"Like most Nigerians I woke up with that breaking news. I felt very sad because, the commando style arrests and attempted abduction of serving judicial officers are entirely misguided, represent a further misadventure in our democratic journey, and threaten to return the country to its recent dark days."

"The manner of the arrests and attempted abduction represents the height of impunity and breakdown of law and order."

"In all circumstances, the rule of law must prevail. There can be no excuse for the shameful desecration of the rule of law
by the DSS."

"We cannot condone such jungle justice under any pretext and I fear that the misguided actions of the DSS have done more harm than good, to the fight against corruption."

"The DSS is seeking to return us to the rule of force, but that can only presage a breakdown of law and order."

" Whatever the alleged crimes are, there must be due process. Was any of the Judges invited for interrogation and
refused? Are public officers suspected of crimes arrested by the DSS in such commando style? We must strengthen
our institutions rather than weaken them."

" The actions of the DSS show how very weak our institutions are, and how they can be manipulated and misused for ulterior
purposes."

[size=14pt]We need strong and independent institutions, not strong Presidents or DSS Directors[/size]."

http://leadersandco.s3-eu-west-1.amazonaws.com/wp-content/uploads/2016/10/10220355/LAWYER-OCT-11.pdf

odikimi:
I just watched the video, Justice Danladi Umar is so shameless. I was thinking Saraki's lawyer said anything wrong, the judge just show to the world that he is so bias.
You don't go ahead with a trial when there is a motion challenging your impartiality. OMG, pls when will Nigerians be objective in their judgment.

Whether or not Saraki is guilty, Danladi is a complete disgrace to the Bench and even to the legal profession.

"Stealing" can be different from corruption.

Consider these Scenarios

1. A government official is driving on the road with his convoy and escorts; with their sirens and unruly nature, they bully other road users out of the way and even damage their vehicles.

That IS CORRUPTION even though it is not stealing!


2. A government official dips into his department's budget and diverts one billion naira to his own account.

That is STEALING; it should not be dignified with the nicer word "corruption" - (though technically, it can also be called corruption).


3. A clerk in a government office demands egunje/gratuity/'PR' of 2000 naira before releasing a form to a member of the public who needs it.

That IS corruption --- but not quite stealing.


4. A person goes to an airport or government office; he offers a 'gift' or really bribe of 5,000 naira to officials so that he can do/get something he is not lawfully entitled to.

That is CORRUPTION ---- even though it is not stealing.


5. A male university lecturer pressurises a female student into sexual relationship with the threat of failing her.

That is CORRUPTION ---- though it is not stealing.


6. A student offers a gift or bribe to a lecturer ---- so as to get better marks or even exam questions.

That is CORRUPTION even though it is not stealing.


7. A state governor collects security vote from federal allocation and diverts it into his own account for personal use.

That is STEALING and is really only dignified by the word "corruption"; the governor is a thief or "stealer" not merely corrupt.


So you see, when understood properly, the statement that "ordinary stealing, they are calling it corruption" is actually correct!

"Stealing" can be different from corruption.

Consider these Scenarios

1. A government official is driving on the road with his convoy and escorts; with their sirens and unruly nature, they bully other road users out of the way and even damage their vehicles.

That IS CORRUPTION even though it is not stealing!


2. A government official dips into his department's budget and diverts one billion naira to his own account.

That is STEALING; it should not be dignified with the nicer word "corruption" - (though technically, it can also be called corruption).


3. A clerk in a government office demands egunje/gratuity/'PR' of 2000 naira before releasing a form to a member of the public who needs it.

That IS corruption --- but not quite stealing.


4. A person goes to an airport or government office; he offers a 'gift' or really bribe of 5,000 naira to officials so that he can do/get something he is not lawfully entitled to.

That is CORRUPTION ---- even though it is not stealing.


5. A male university lecturer pressurises a female student into sexual relationship with the threat of failing her.

That is CORRUPTION ---- though it is not stealing.


6. A student offers a gift or bribe to a lecturer ---- so as to get better marks or even exam questions.

That is CORRUPTION even though it is not stealing.


7. A state governor collects security vote from federal allocation and diverts it into his own account for personal use.

That is STEALING and is really only dignified by the word "corruption"; the governor is a thief or "stealer" not merely corrupt.


So you see, when understood properly, the statement that "ordinary stealing, they are calling it corruption" is actually correct!

blackpanda:


You may not want to hear it, but for now the efcc works with the government's body language. Under jonathan the body language was simple: stealing is not corruption. Which means arresting looters was a waste of time and we saw it in several cases aviation minister, farouk lawal etc

Whereas Buhari's body language is to arrest and prosecute anybody involved, no matter how highly placed.

Lets face facts, all these arrest would never have been possible under Jonathan. Infact u wont even hear of the case, let alone arrest. Spurious committees will be set up to destroy any evidence

You may be right that maybe Jonathan should have addressed the problem of corruption seriously.

However, let me demonstrate that "stealing" can be different from corruption.


1. Consider this Scenario

A government official is driving on the road with his convoy and escorts; with their sirens and unruly nature, they bully other road users out of the way and even damage their vehicles.

That IS CORRUPTION even though it is not stealing!


2. A government official dips into his department's budget and diverts one billion naira to his own account.

That is STEALING; it should not be dignified with the nicer word "corruption"!


3. A clerk in a governement office demands egunje/gratuity/'PR' of 2000 naira before releasing a form to a member of the public who needs it.

That IS corruption --- but not quite stealing.


So you see, when understood properly, the statement that "ordinary stealing, they are calling it corruption" is actually correct!

Grateful if anyone remembers and/or knows the title of a song (maybe by Alex Zitto or Alex O or someone like that) that included the word 'ochongologo'?

Would be grateful for any info, thanks!

Does any one have or know the list of the music played by the military band during the parade? I know that one of them is the C & S song 'Lo Kede Ayo na' but I really wish to know the title of one of the songs played a little earlier than that one.

Thanks.

March 2015


“As a father, I feel the pain of the victims of insurgency, kidnapping and violence. Under my watch, no force, external or internal, will occupy even an inch of Nigerian soil. I will give it all it takes to ensure that our girls kidnapped from Chibok are rescued and reintegrated with their families.”

Buhari vows to rescue Chibok girls if elected: http://www.thecable.ng http://www.thecable.ng/buhari-vows-rescue-chibok-girls-elected


Also: http://dailyindependentnig.com/2015/03/jonathan-insincere-fight-corruption-insurgency-buhari-2/

https://www.facebook.com/APCSupporters/posts/899040353481842