₦airaland Forum

Namzy:
Lol you sure say you look well? 100/50a led version
12v 24v solar controller MPPT solar controller model 100v
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For lcd 100/50a version
Wholesale price for FANGPUSUN TOPSALE MPPT solar controller
https://s.click.aliexpress.com/e/c5A2UbwY

dejidotun2000:
In a 3 phase star connected winding (which is what your transformer is), if the neutral terminal were to become ungrounded the neutral will rise with respect to the ground except the loading on the 3 phases is balanced.

The loading is never balanced thus you will find a voltage on it.

NiyiOmoIyunade:
My Oga

I was reacting strictly based on the information you provided (my best interpretation of it). Surely, I may be unable to accurately diagnose an electrical fault (from several KMs away and based on just one or two sentences defining the problem ) better than you that was 'live at the scene of the crime' (so to speak)

No offense intended at all.

It is customary in Nigeria to have one or two phases with no voltage feeding in from the PHCN mains - still for the grid to pass power through to an inverter and loads, at least 1 live phase out of the 3 available is required as the source of supply .

Given 1 live phase and no power pass through the next check would be at the return wire (Neutral) - if you were able to substitute the Earth wire as return path and thereby reestablish power, then I inferred that the Neutral was broken/open somewhere in the network esp. if the neutral was presenting as a voltage source.

It could also be that you had a short circuit somewhere within the facility or the phase and neutral touching (e.g. tree branch pushing against power line) somewhere in the grid system.

There are several possibilities, you as the man on site are best placed to diagnose the issues and bring the learnings back to the house.

With electrical faults, my personal preference is to isolate the issue for sure and fix it immediately to avoid further problems downstream.

NiyiOmoIyunade:
This may be one instance where it worked may not have been best practice except as a strictly temporary fix.

It seems to me you had an open neutral and by jumpering Neutral and Earth, you simply substituted the Earth wire as the return path for current.

By design, the Earth wire should carry no current unless there is a fault condition - all sorts of bad stuff could happen using the zero reference (Earth) as a return path for current on a routine basis.

NiyiOmoIyunade:
I have a question for the electricity buffs in the house.

A friend is constructing an office complex and his electrical contractor wants to install an RCD/RCCB at the service entrance to protect the whole facility (all personnel and devices downstream of the RCD/RCCB)

In order to 'improve the speed at/certainty with which the RCD/RCCB could respond to a fault and disconnect the supply', he has already jumpered/connected the Neutral and Earth bus bars in the DB with a 16MM cable - this installation is here in Lekki - while I know this practice of linking Neutral and Earth is common practice in North America and even mandated by their electrical code, I am yet to see it done here in Nigeria.

I had raised a similar question previously - what do you think? Should Neutral and Earth ever be linked here in Nigeria (I believe our transformers are star/wye wound and the neutral wire center tapped - dunno if PHCN actually Earths their neutral wire at the transformer)

Does this practice help the performance of an RCD/RCCB in any way?

The office will also have solar power tied in(where I come in ) - I am struggling seriously with wiring the CC Earth terminal to that same Earth bus bar in the DB that already has an AC neutral connected to it.

mctfopt:
That clone issue is hard to prove
There are these back and forth accusations between these two. The difference between the two is not much: by the way I have seen both and I don't really see any difference between them hardware wise apart from the software little difference. That being said, getting an MPPT won't be a waste of money.

I'm still a bit confused on the part the laptop charger plays.




Also, how is it much of a difference to your landlord if you change your panel connection configuration from parallel to series as I think you already have two panels connected in parallel? I thought the problem he has is with you adding more panels.

ameh99:
Still available

mctfopt:
That clone issue is hard to prove
There are these back and forth accusations between these two. The difference between the two is not much: by the way I have seen both and I don't really see any difference between them hardware wise apart from the software little difference. That being said, getting an MPPT won't be a waste of money.

I'm still a bit confused on the part the laptop charger plays.




Also, how is it much of a difference to your landlord if you change your panel connection configuration from parallel to series as I think you already have two panels connected in parallel? I thought the problem he has is with you adding more panels.

mctfopt:
It's not normal. I really do not understand the part about adding a laptop charger to the system. You mean you added the output (in DC) of a laptop charger to the input of the CC or directly to the battery?

I think the problem may likely be the PWM CC. Try getting an inexpensive MPPT ,and connect the two panels in series. Do you ever charge with the inverter? If you do, what voltage do you get when you do.

mctfopt:
It's not normal. I really do not understand the part about adding a laptop charger to the system. You mean you added the output (in DC) of a laptop charger to the input of the CC or directly to the battery?

Yes pls.

I think the problem may likely be the PWM CC. Try getting an [color=#990000]inexpensive MPPT [/color] i have an issue with my landlord not allowing pv installation so i really cant increrase my panels as i would want,and connect the two panels in series. Do you ever charge with the inverter? nope, its a cheap 500w car psw inverter If you do, what voltage do you get when you do.

frowland:
I once paid for rent like this until I realised I was dumb paying such for a rent. I now live in my own house with better facilities than the rented one. I took the hard decision to stop being stuupid. Anyway, everyone have reasons....

Sicilyjoe:
What is the purpose of those TVs on high prices, I still don't understand, even if I become governor I will not waste such amount of money on just ordinary 1 TV, impossible

Tsauce:
For sale
Nextra

Chest Freezer, NX-150D, 100 litres.

Used for 6 months. Works perfectly.

Defect(s) - None

Reason for sale - Got a bigger size
Price: 45,000
Current price on Jumia is 60,900.
WhatsApp 08075606970
Location : Egbeda,Lagos

CAN U SNAP THE POWER LABEL AT D BACK PLS? IS IT STILL AVAILABLE THO? NEEDED AT IGANDO

Ulrich01:
Am even thinking of getting a different inverter. The mercury inverter has no transformer in it. So am guessing it's also part of what caused damages to the batteries.

What's your say on microtek inverters? Been hearing good things about it lately.

sunlawphy:
bro this issue is just a small prob(not even a prob),because if I am in Lagos I will have sort out this little iss since

ShafebProperty:
Since November bro
I paid extra 20k to get a 32led instead of the 22inch they sent me a 32 hisense lcd TV which isn't neat at all and I keep telling this boy I wouldn't want to use military influence on him it would seems like I'm trying to use my power on him. He just keeps telling me sorry that he's not around I have spend almost 55k plus TV money and I haven't gotten what I pay for.

binladen:
Urgent pls... Suggest an inverter of 12kva either 48v or 96volt input ( 120volts too) please

ShafebProperty:
The TV stopped working 2 weeks after, I called to explain to this boy about the TV he sold to me, he was giving excuses to get another adapter for it and all which I did on my expense burn still the same problem I called him again to tell him about the situation he was now telling me that the he got the TV from another man that he said I should bring it back to Lagos from Abeokuta. Which I did since 2nd week of number. This boy has been playing me with his boss after paying him another 20k to get a 32inches instead of the 22inches.

cooldipo:
I bought my batteries from a guy at Arena and he gave me 4 months guarantee.... That was last year August and it is still going strong

Barezzi:
Evening guys,
Abeg is it really necessary to add a circuit breaker between a charge controller and the battery?
Charge controllers are designed to throttle the current at it's maximum rating. What's really
the function of that CB?

NiyiOmoIyunade:
I think I am just paranoid and extremely safety conscious sha!

You definitely know what you are doing and are capable of assessing and mitigating any risks.

I will reach out to you to discuss all our outstanding matters.

NiyiOmoIyunade:
Interesting idea. The possibilities are truly endless if you put your mind to it.

For the mentioned application though, I would be happier if you used a suitably rated contactor instead of a relay, granted your loads are small but I just prefer a sturdy device for switching and you would also need to isolate the loads the contactor will switch e.g you don't want your small Gen to try to power up the AC or Microwave or Freezer or other high wattage appliance when the mains supply fails.

See below a picture of contactor vs relay - see how small the relay contacts and internals are - hard to get thick wires into the relay and their mechanism of failure is also more a bit more spectacular.

Safety is very important above all else and we don't pray for any mishaps - for this reason, I have a bagful of relays I will no longer use since my needs are medium to heavy duty - free giveaway as well for anyone who can pickup who wants to use them for very light duty applications.

Now I am looking for that 80A relay Oga Dapsyra mentioned to play around with Source anyone

Barezzi:
In addition to what Niyi has said, add a Time delay switch to delay load transfer to the generator. You don't want the contactor and by extension the loads to chatter during manual Gen startup.

NiyiOmoIyunade:
Lol My Oga. The sages say necessity is the mother of invention

You got a much larger contactor than I use - 80A 2NO 2NC to my own 40A so it makes sense that you paid more.

What I find though is you get better prices as you move closer to the source so my first ever set of LC1D25008, I got at 20k for two units including delivery to Lekki, same contactor I got now for 3k each as I cut out the middle man and moved closer to the mainland source - if you factor logistics they came at 4k each now.

Interestingly, I just took delivery of a batch of stuff from Ali... 25A Tomzn 2NO 2NC contactors and each cost under $6 - after my trials, they will now be my electrical switch of choice for large single load or multiple small load switching applications for my clients, the prices were so good I got a few random stuff as well - several large capacity AVS and diverse DC breakers - with a few hacks taught to me behind the scenes by a member of this forum, I got the entire package to land at my doorstep in a little over 1 week at a great price.

Your comment about duplicating dual AC source and output just sparked off a few ideas in my head, I will experiment and revert if I succeed - I may yet make my own Victron clone afterall.

NiyiOmoIyunade:
Location is Lekki - you can pickup directly or arrange a bike courier - just let me know in advance so I can have it ready.

No plans to fix the inverter for now - I don't really use the charger function as I was setup to be 95% offgrid but middle last year, I setup a timer and contactor arrangement so that I would always use mains electricity if available between 8pm and 3am daily - I needed a contactor to route the loads through because I also had an AVS between mains and houseloads and the AVS would not pass the average 2kw and peak/burst 4kw of loads I had in the evenings and ditto for the timer too - they would just melt under the load.

I basically used the timer switch to feed power to the AVS (between 8pm and 3am daily) and then the AVS to energize the contactor coil only if the line voltage was between 210v to 235v. Both timer and AVS carried zero load, they just passed along the voltage signal for the contactor coil.

So I was basically using the inverter at the lowest charge setting since the primary goal was to bypass battery and power house loads directly from mains - but once the inverter charging function spoilt by itself, I happily got a second contactor to simulate the inverter's internal transfer case with the bonus that my setup was now more efficient with the charging disabled. So with 3k for the contactor and 15minutes spent rewiring I was setup and good to go.

Oga Pranil once said I needed to graduate to using ESS - well he was right! - Victron is the next brand I want to try once I am able to afford it - I have gotten tired of all the random issues with the Mustpower type inverters - the only ones I would touch now are those with an organised service center and good customer service such as Felicity.

ameh99:
48k without charger..

NiyiOmoIyunade:
Thank you Sir

I think you are on the right path - you could borrow a DSTV power supply - they output about 12.4v or so and I happen to have one or two lieing around as well if you are able to pickup.

No you don't need a resistor.

Interestingly, I was forced to start external switching between Mains and Inverter this weekend as my Red VilPower 6kw had progressively stopped passing the line over time, then stopped charging altogether on Thursday so by weekend I layed hands on a LC1D25008 contactor and removed the mains from the Inverter and routed it through the contactor and so far working beautifully - this will be the arrangement till I can save up for a premium inverter (been itching for a Victron for a while)

See if you can spot which wire is which from the pictures (I switched only live wires for simplicity and I used 4MM wires for all the Common and Load (I run two ACs and other stuff nearly 24/7) except for the signal wires which are 1.5MM

Explorers:
The future of war: Lockheed Martin and Sikorsky reveal radical SB1 Defiant 'supercopter' that will be the fastest helicopter in the world (and replace the Blackhawk AND Apache)

The radical craft is being built by Lockheed Martin and Sikorsky - and has been revealed for the first time.

Craft could replace the AH-64 Apache attack helicopter and the UH-60 Blackhawk

Craft tops out at 300 mph and is able to hover 6,000 feet in the air


It could be the future of military helicopters.

Called SB1 Defiant, the radical craft is being built by Lockheed Martin and Sikorsky and has been revealed for the first time.

'The SB1 DEFIANT is designed to fly at twice the speed and range of today's conventional helicopters and offers advanced agility and maneuverability,' Sikorsky said.


The primary advantage that Defiant's going to offer over a traditional helicopter is, it's got twice the speed, two to three times the range, and is just an extremely maneuverable and agile platform,' said retired Marine Maj. Frank P. Conway, Sikorsky's experimental test pilot for both the SB1 and the V-22 Osprey tiltrotor, when the concept was first unveiled.

He called the Defiant 'a very hot, sexy aircraft.'





https://www.dailymail.co.uk/sciencetech/article-6542907/Lockheed-Martin-Sikorsky-reveal-radical-SB-1-Defiant-supercopter.html
Lalasticlala, Mynd44