₦airaland Forum

pheleix:
Where did it say 100% or 120% Efficiency.

Have you guys thought about companies labelling panels with greater than or equal power to the nameplate rated power. A 300W panel could be labelled 270W

For example, in the picture attached (Solarworld 270w)
Multipling the max voltage and max current give approx 272.23

Yeah, I noticed it too, but I see the manufacturer simply rounded down to the nearest whole number.
That's a reduction of 0.8%!
So labeling a 300w panel 270w will be an 11.1% reduction!!
What's the relationship between 0.8% and 11.1%??

bodejohn:
I am making this submission in order to stimulate ideological discussion and to dismiss hear says and half truths.

... is an ever increasing factor called Temperature coefficient.

Most of the extra insolation received in Lagos (5000W/m2, see attached Document) in the day is lost due to environmental conditions rather than bad installation as it is claimed. An average of 50% of same insolation is covered by the clouds in the sky.

Very interesting submission...
I especially like the insolation graph. I need the one for Cross River state.
The bolded above is your opinion, as there're no empirical data to substantiate them.
A proper installation can generate 30% more power in the same Lagos example you used, all other conditions assumed constant(including panels from the same manufacturer).
Temperature sensitivity of both the Suntech and Solarworld panels for the SAME power ranges are within the industry average.
Panel manufacturers use different material qualities for their different brands. Compare the datasheet for the 250w range of panels of different manufacturers.
I do agree with you that with TOP brand manufacturers, for the SAME rated panels ranges, it all boils down to OPTIMAL installation and irradiance for your area.

Yes, we are above the STC conditions, but it works in our favour with optimal installation, including Solar Tracking if you can afford it.

lekjons:
I would have abused you,but when i checked your d.p. I kept my cool (I don't like abusing older people),what I said was my own opinion!..U should have posted only the bolded..

I recant!
Sorry about my earlier outburst!
We cool?

adrusa:
Solar setup is not always an exact science, one needs to sometimes sit down and do the maths. If 2KW of "alaba" panels gives me 1KW peak performance but it costs N100,000, does it not make sense to buy that compared to more expensive panels that gives me 1kw/1kw but cost N150,000? Rather than talking about panel this, panel that, we should talk about the eventual cost per kWh generated. And I'm with bodejohn, unless panels are deliberately underrated, achieving 100% efficiency is NOT POSSIBLE. That is the law of physics. When you convert energy, you MUST LOSE some. If you are seeing 120%, it is either your metres/readings are faulty or the panels have higher ratings than the labels on them. And no one should equate loquaciousness to knowledge. Indeed, most people who claim expertise here appear to have poor theoretical grounding.

Solar panels come in different categories, from premium to economy brands. That's why you can have panels from different manufactures with the SAME rated power perform differently under the SAME conditions. This information you can easily find on the datasheet of every solar panel.
Every panel reacts differently to ambient temperature and solar irradiance.
I had to look at the datasheet of my spare "kpako" panel, and found that its power rating is based on Lab conditions (STC) of 25 deg C and 1000w/sqr meter irradiance.
I am sure you will agree that in field use, each panel deviates from its STC I-V curve characteristics...
Ambient/cell temperatures usually escort below 25 deg C, and i'm sure in Nigeria we have peak solar irradiance in excess of 1000w/sqr meter.
Can this scenario cause a transient surge in field performance better than Lab conditions??
Don't be too quick to condemn what you've not exhaustively researched.

lekjons:
gone are the days when nairaland use to frontpage 5-10 topics per day,now they can frontpage 200 unreasonable topics per day,believe me, nairaland is getting boring day-by-day..or am i the only person feeling that way? What do you think guys??

Go and die!!!
We have over 1 million registered members on NL, we must not all like the same things!

Anoruo:
Source: www.nigeriafilms.com/news/22282/33/senators-salaries-and-allowances-in-nigeria.html

Car allowances, severance gratuity, vacation allowances, constituency and accommodation allowances CANNOT be paid MONTHLY.
No company/govt in the world does that!
OP review your list and give us facts.

JUO:
for the past two weeks i have not been able to fully charge my battery. the reason is because nepa gives us light 40mins in in 6hrs and my 390w solar can't charge my 400ah battery during usage. any suggestion?

Yes, increase your solar array.

bodejohn:
You can only confirm this by monitoring or logging the data on the CC over a period of time.

But as it is now, to me you are trying to kill a hen with a rocket launcher.

I have over 180 days data.
Doubling my battery bank should do the trick!
I'll start from there...

bodejohn:
Obviously, your battery bank is too small for your 2.1kW solar panel array considering the fact that you also dont go below 60% DOD.

If you can double your battery bank, you will see a significant increase in your power generation.

I usually do not advise mixing old and new batteries especially when the old batteries are more than six months and of different model or manufacturer.

This's precisely my gut feeling.
I'm also convinced my array is not optimally installed.

bodejohn:
Barezzi,
How many batteries do you have?
And what is the capacity of each of the batteries?

Four 12v batteries at 200ah each connected in series.
4kw+ magnum inverter...

salam12:
As rightly mentioned above, overall harvest is also a function of what is being demanded. Even if you have the best panel money can buy and your energy usage is low, your yield won't shoot beyond what you have consumed.

I'm seriously suspecting my solar panels installation. I have a deep freezer, fridge, water dispenser, and electronics hooked on all day. Occasionally, the microwave oven, washing machine etc...
The best harvest in the last 180days was 6+kWh. It hovers between 4 and 6kwh daily.

If there's no utility support for about 3 days, the inverter will hit Vcutoff at 60%dod.
So I mitigate this by rationing from day 2, as the harvest is not enough to meet demand.

Richmond maybe right about my installation. From the testimonies I've read so far, my harvest is seriously below par!

Note, the highest instantaneous power recorded was 1700+Watts. From November 1st to date, it has not exceeded 1400watts.
I'm in Calabar, it still rains here, so my panels are clean.

What's the way forward?

bodejohn:
Bursting the chart with the first ever >10kWhr a day harvest
Happy days are back...

Highest I've recorded in a day was 6.1kwh.
My array is 2.1kw.
These days, na 5kwh+...
I wanna upgrade my array to 3kw, and battery bank to 400+ Ah!

So sorry for his loss... Forensic investigation needs to be carried out, hope the crime scene has not been contaminated.

RevDesmondJuju:
Buhari is the only reoccurring decimal in your equation.

If you like per him with Jesus Christ himself, he will still lose

SPOT ON!!

Tintinnoty:
its true guys I have 23mb left on my phone last nyt but I noticed that I've been browsing since morning even though I knew should have exhausted the 23mb. So I decided not to check my data balance thinking it was an error from airtel. but when I saw this post I summoned courage and check my balance, alas I found 500+mb....... surprise surprise. airtel rocks.

Edit ur pic, and gray out that babes number. I sure say she go don get 1million calls by now

Nothing

Exactly!
This dry season promises bumper solar harvest!!

wow!!!
Great memories...
Voltron! Defender of the multi-verse

lacord5:
Darling your husband seems to have extra cash in his pocket all the time, money make men cheat! They have enough to hang out, pay for hotels, take care of their new babes etc. Now he is able to do all that cos you have a good job and probably shoulder half of your family responsibilities, believe me if he were broke (I don't mean unemployed oh) and thinking of saving up money for children's school fees and rent and insurance, he won't have money left for extravagances.
Now solution... Change your kids schools, take them to a better and more expensive school, tell him their old school is now crap and it's a good investment to their future, be all nice and sweet while talking about this . Then, where do you live? A rented house? You need to get a land and start building, tell him how real estate is the new rave and a good investment too, look for a land and get him see the need to have his own house, by the time he starts building every kobo will go into it, be supportive too, show interest and always hang by him. If you already have a house, build more for rent and as an investment.
Again it may be hard but show him love, forgive him in your heart, be an active member in your church and get him to become one too, if you don't have a nanny please get one, hang out with him and those his friends and slowly get him to hang with you, be a buddy. Don't report him anymore to anyone, don't claim to be too tired to go to parties and clubs please go with him, listen to gospel teachings it will ease your pain.
DO NOT CHEAT BACK! It is your body, you won't like to desecrate yourself just cos he is doing so, you will feel worse. And it won't solve anything at all.
Stop cutting cost, get those things your family lack, don't wait anymore, get him to spend his money, start projects and don't stop... And moreover pray for him to change, don't underestimate the power of prayer and money

Best advice so far!!!

nigerianwire:
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karmaleon:
Get some rat poison and give him a treat!

ERCROSS:
That hug-lee boiy..

This one go get strength to Bleep o...

TechyGirl:
What type of android device do you use?

HTC One...dual SIM

Tell me more about ES File Explorer...

Tallesty1:
You are not financially responsible if Nigerian Girls do not call you "stingy man".

Gold!!!

vicchi12:
Hello Alex, you are a certified idiott for bringingmy mum into this. You hVe no iota of respect in your body. I guess that's the kind of relationship your mother has with your father, that's if you have parents anyway. Cos if you did, you won't have said such a dumb crap. Dummbfucck!

I fully agree with u. The idiottt couldn't post his opinion and move on without involving ur parents!
Na this kind thing dey make me tire for nl.
If u don't fancy the topic, then stay the fukc out!