₦airaland Forum

Sunnymatey:
Ghen Ghen, naija is loading.

Becareful what you wish for...

Car batteries for renewable energy? You must be joking...

Their build is completely different from deep cycle batteries used for renewable energy.

...and that's how it should remain till those governors understand that teacher's welfare and condition of service is top priority!

When i remember...remember water run away me eyes o...A...E...A...E...water run away me eyes o...

I can still remember that cloud of sadness that eveloped the whole of Iwo town when George Iwilade was laid to rest...

Sleep on comrades...

Dodo Mayana...!!!

Love Machine:
Do you also know that some banks released list of chronic debtors some months ago?Why has amcon not go after them?

And that's my point...Ben didn't insinuate that he is being persecuted. Even though thats like the easiest thing to say...

Really never gave a damn about this guy...but its quite impressive he didnt link this with being in opposition and critical of the ruling party....

shaddoww:
Who cum tie u down for dis clime?

To the contrary, I'm not tied down to this superstitious clime....maybe that's why I see things differently...

Exposure to foreign civilisations should not only be about bringing back fake accents...

In other climes...people discuss the latest trends in medicine, technology and fashion but in my dear country we are talking about a cat turning into a girl...

Little wonder we have touts and illiterates leading us...

fados4sure:
You are lying because am in UK and for the past two months, i have not be able to make withdrawal with my card

I have no words for you, but if you are a man or woman of honour, you should apologize for calling me a lair.

9PBLIVE:
they said *all naira* not fidelity naira debit card

You mean "all fidelity" naira MasterCard, think of it, will fidelity send out information about a GT bank card? Probably NO.

OP, that's a misleading title. At best you should say Fidelity's naira cards are disabled.

I'm presently in Germany with GT bank's naira MasterCard. I have been paying for train tickets, hotel and at restaurants at an average of about 390 naira to the Euro.

I even made a 200Euro withdrawal on Sunday morning.

Only Michelle remained unchanged...
The girls are all grown up and Obama's black hair is now almost white...
Can someone already take Buhari's family picture...
So we can have something to compare with in 3 or 7 years time...

Her boyfriend took the picture...she is gushing at him....

From experience....I think Czech Republic is much easier...the application fee is cheap (about 12 or 13k a year ago) but the embassy is in Abuja only...and you have to book an appointment online.

mank1234:
Very correct. It shows the power from the panel that's in use

I didn't say your controller is misfiring but rather that the values are inaccurate. Power output shouldn't be more than the input

Uploading your log does not change the fundamental thing stated above: log figures is inaccurate so long as output power is greater than input Power.

I'm done on this. No more response from me cos it's obvious that we'll only be going back and forth without any success nor agreement.

I am also not interested in the long dialogue since you or any other person has not uploaded another log to proof that the one I uploaded is incorrect or inaccurate.

You also obviously overlooked the part of the log where the output becomes less than the input. I suppose the controller chooses when to work accurately and when not to.

mank1234:
If you're saying that what u see at the input of the controller is not what comes from the panel, it therefore means that the reading at the controller is wrong, which is shouldn't be the case. I maintain that cc does not add to the power from the panel, it only ensure that the panel operates at a voltage/current combination that will guarantee maximum power and in so doing it uses little energy from the panel itself.

The reading at the controller is not wrong, just as the reading of about 200 or 300 watts shown by the CC on absorption is not wrong until you kick in a power load and the production jumps to about 500watts or more as the case maybe. The work of your controller is to optimize the power delivery to your batteries.

Ok...assuming my controller is misfiring....how do you explain the later part of the day on the log when power output falls below the power input? Are you saying the controller corrects itself in the afternoon only to misfire the following morning?

I will log one of the controllers again tomorrow and will upload for you to analyse. If you have a similar controller I will encourage you to log yours and share the file.

mank1234:
You said so, dear friend when you supported wrong reading ab-initio. We only pointed out that output figure is not possible cos of efficiency limitations. Your log also suggests that, power is increased. Welcome to our side, though.

As regards, your challenge: the web server in my charge controller crashed in 2014, my laptop doesnt have serial port.

Your CC can deliver more power than it 'says' it has received from the panels.

This is because what you see on the input of the controller is not the maximum the panel is producing at that moment especially in the morning at cold temperatures and because your batteries are at a lower voltage in the morning.

mank1234:
My dear, your battery voltage reading is inaccurate and that's what is making you believe efficiency can be > 100%. Get whoever installed the gaddam stuff to connect battery sense voltage.

Having uploaded your log, it's clear that your distorted figure isn't due to glare or shading but rather due inaccurate reading.

36V system cannot charge by 10V under 5minutes.

Give me kudos when you get it sorted out.

First...there wasn't any 10v battery difference...what you are referring to is the period the controller was doing a sweep of the power curve to determine the maximum power point...you can set the frequency of this sweep with some controllers. You should that the corresponding input and output power at that instance were zero.

I did the installation of the controllers myself using the recormended sense wire gauge.

One fundamental point you guys are missing is that the input power you see on the controller is not the maximum the panels can deliver...solar panels are dummies and batteries are even dummier, the more reason why a controller is needed to match the batteries to the panels.

I'll give this example....I came home one day and saw about 300watts max generation on my CC, I went in and then switched on one of the fridges...the power jumped to about 500watts...where did the extra power come from? Of course from the same panels.

When the load, that is, the batteries are not optimised or matched with the panels, the power will be will be generated by the panels but will not be transmitted to the batteries.

mank1234:
A closer look at the log reveals something baffling, within 15min(item 15 to 19), the fluctuations in battery voltage suggest that the figures are inaccurate: up and down by as much as 10V. If it were accurate, there's no way output power will be more than input power. MPPT selects the the best power point (a point at which current * voltage of the array is maximum).

Hope you are using a battery volt sense wire and your ferrite core in place. Other than that morningstar specifically states that battery voltage reading will be inaccurate. Verify from your log that battery voltage sense wire is in place

You should also have noticed the corresponding increase in the power generated within that same period.

The down trend on the voltage indicates when my power guzzlers...two fridges and a freezer, came into the party...

I have at no time said the controller increases the amount of power generated....but it ensures you are getting the best from your panels...

I have had voltage sense cables from day one the controllers were installed.

Since you all are experts with TriStar...how about you uploading your CSV files?

DMerciful:
Imagine someone arguing fundamental physics...thanks for enlightening him....

Now...I see what JUO was saying...

How can a glare happen every 5 minutes from 8am to 12 everyday on two different controllers?

A bit of more clarity...the panels have points on their curves where voltage and current is producing maximum power...this is what your mppt controller is tracking...some CCs will show you what you would have been receiving if the mppt algorithm was not there.

Unfortunately, you guys think that's the maximum the panel is producing...

Why don't you take the challenge...upload the CSV files from your own controller if it produces any...

JUO:
your system is doing good according to the log. But your battery voltage, very critical. Enjoy sir

I'm on a 36v battery system...50% dod is 36.6V.

JUO:
bros longest time

I'm good brother...

mank1234:
Those current spikes are caused by solar glare or sometimes by partial shadowing of the panel. At those times the voltage input is momentarily greater than Vmax of the Cc (ie >150V). The controller doesn't record the short pulse of voltage which is beyond its range but it however keep record of the current which is well within it's range. That doesn't mean that that's what you're harvesting.

It's been a topic of discussion in various forums where morningstar mppt cc is discussed. You're suppose to expung those spikes to get a true picture of your system's performance.

I am uploading a copy of my log for you to see...
I will also be attaching a screenshot later...
As i have said...log your controller and covert the logs to a csv file...

mank1234:
Check attached efficiency chat from the manufacturers themselves does it buttress your assertion. If yours function as you claimed it could be that measuring circuit is faulty. Efficiency of a cc can never be >100%. We are not arguing with you; we're enlightening you. Where we don't know we seek for advice, but on this one I think we are an authority on this subject.

Looks like you have a Morning Star controller...when you have the time, log your daily harvest...make sure you select input / output voltage, input/output current and input / output power and temperature.

Before you do...check the graphs of the mppt algorithm, you will notice a slightly higher point on the maximum power current path as compared with the Isc of the panel...that point is always changing more reason the controller keeps tracking it...how should I explain the DC to DC converter in the controller that converters "excess" voltage to current to you?

I have two 45amps morning star CCs...I have logged both CCs at different times...converting the logs to excel documents for analysis....it is not a one off thing... it happened every single time I did the logging...if you have not done this logging before...you are not yet a master on this topic not to talk of an authority...

DMerciful:
Output cannot be greater than input Oga.....mppt or zppt or whatever! Na perpetual motion machine? The controller may be solid but the reading ain't right!

mank1234:
Morningstar Cc? Lol. May be yours is a Chinese copy, if you've seen such figure in yours before: instantaneous output power more than the input power.
Yes performance of solar panel dips during hot weather but that has nothing to do with cc. It's an inherent properties of solar panels.
Ignoratio elenchi.

I don't have words to argue with you both...
There is a reason why mppt is called maximum power tracking....

I'm a bit lazy tonight...I would have shared logs from my "Chinese" Morning Star CC...check the difference in the power....it's a few watts...

Guys....don't just argue....read about mppt controllers!

JUO:
even after seeing the picture? getting facts across to 'sincerely ignorant' people is like baptizing a cat

@ Juo....you should have helped your friends by telling them the CC is mppt....

This is one of the reasons why some will advise the use of mppt controllers in solar setups...

I have seen these type of figures severally on my morning star CC although this happens before midday...because efficiency of solar panels dips with temperature...

We will not devalue the naira....we clapped

We will devalue the naira...we clapped...

Talk is cheap...Reno and his boss had the chance to lead Nigeria out of the doldrums...but the results of their actions and inactions is now our albatross...

Unfortunately...we have handed the reins of leadership to a team that is been driven by a man with only a learners' permit...

iammartinzo:
Thanks bro. It will end in praise. Just be optimistic and positive. I don't believe it's attached to travel date though the travel date attached to my wife's own is June. We shall hear good news soonest IJN

Thanks...but as I have said severally, I am not particularly anxious about their response.
I have been to CA twice before and I have a trip to Turkey and the US with my wife in August with tickets purchased in Nov 2015.
So God giving us life, I still have a vacation in August irrespective of their response .

iammartinzo:
@bodejohn how far bro? It finally happened today o. They replied and Pp for my wife. Thank God. Any news from your end?

Congratulations brother...
I have not heard any information from them yet although I mailed the CIC Ghana last Friday.
Maybe they considered my application not urgent, my travel date in still in August 2016.

We need to ask the PDP what 'Change' they are talking about...abi no be the mistake we made with APC's change be that?