₦airaland Forum

mokrak:
I have an issue with my mercury 3kva inverter.I usually have nepa light for 12hrs, even though the batteries are fully charged and the indicator show that.the fan of the inverter keeps on humming.is this normal or it was wrongly installed.
Also for my fellow mercury battery users which is better the mercury elite tubular or the mercury deep cell.

Hi Mokrak,

The reason for the fan is still humming while the batteries are fully charged is because NEPA light is still going Via the Inverter to supply the load in your house connected to it. This is normal behavior for Mercury inverters.

With regards to Mercury Elite Tubular or Mercury Elite Deep Cycle dry cell batteries. They both have their advantages and disadvantages. The Tubular batteries have the highest capacity (220ah), they have 18 months warranty and are built to lasts between five to 10 years. What some may consider a disadvantage of the Tubular batteries is the fact that they need maintenance every 10 months( or there around), when the electrolyte inside them gets low. On the other hand the Mercury Elite Deep Cycle dry cell batteries are completely maintenance free, with a shelf life around 3 years

kam27:
Morning House,

Pls, which is better between a Bluegate 200ah and Mercury 200ah deep cycle?

Also, can I use 1 Bluegate and 1 Mercury together?

They have a lot common, however the Mercury 200ah Deep Cycle battery is cheaper and comes with a free battery tray along with red and black protective terminal covers. It is not advisable to use batteries from different manufactures. For best results always use batteries of the same type, capacity, age and manufacturer.

The Minister of Power, Works and Housing, Babatunde Fashola, has described the increased electricity tariffs as “a painful pill,” appealing to consumers to “swallow” it.

Fashola stated this on the sidelines of the second monthly sectoral meeting with stakeholders in the power sector in Lagos, where he also inspected some projects at the Alagbon Transmission and Distribution Complex on Monday.

He said, “Importantly, I understand that people who have been disappointed over a long time will feel a sense of concern that again tariffs have gone up. But the truth is that these tariffs ought to have been there from day one. I don’t know why the government of yesterday was not courageous enough to tell us this was the price.

“It is a painful pill that I must appeal that we swallow. It is like quinine and malaria. It’s painful; it’s not sweet, I know that, but I do it because we are not left with many choices. This is the first major decision in power that this administration has taken. There are other problems.

“I can only appeal for some understanding and some trust that we do this in the best interest of our country. It is a hard decision, but I think down the line, we will have cause to look…”

Fashola’s comments comes amid the ongoing nationwide protest by workers under the aegis of the Nigerian Labour Congress and Trade Union Congress, which has grounded commercial activities in several cities in the country.

The minister, who faulted the way the privatisation of the power sector was carried out, said the sector was being plagued by several problems including gas supply shortfall and transmission issue.

The President Goodluck Jonathan administration had in November 2013 privatised the successor generation and distribution companies carved out of the defunct government-owned Power Holding Company of Nigeria, leaving out the transmission segment of the value chain.

When asked what the problems in the sector were, the minister said, “The problem is everywhere. The problem is with us. The problem is with gas. The problem is with transmission. The problem is with the way the privatisation exercise itself was conducted.

“But as I have said before, I am not going to lament what has happened in the past. I am going to move on with it. So, the first move we have made when we accessed the situation, nobody was happy with it when we took over.

“This is a problem that has been here for 16 years, if we put it mildly. It is a problem that has been here 100 years ago, if we put it really extremely. I have been here for less than a 100 days, and I think we can solve this problem if you give us the tools that we need to do it. I think that this problem can be solved, and the day that we feel that it cannot be solved, I will gladly come and tell you that I don’t think it will work.”

http://www.punchng.com/31930-2/
http://www.mercurydirect.com.ng/product/mercury-2-4kva-complete-inverter-system/

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adanny01:
Thats my point. In every individual use case has its positives and negatives. As a system planner you have the responsibility to balance the negatives and positives.

In the case you cited above, assuming it has a 20A charger. The system should fully charge in 400/20= 20hrs.

At the point of purchase, if you had opted for the 24v inverter with same charger, charging time would not have been that long but 10hrs.

Every system has its advantages and disadvantage.

A 24 volt Inverter for example will require two 12 volt batteries connected in series to generate the required 24 volts. In order get decent run time we are talking two 200ah batteries. These two batteries have a combined capacity 400ah, but if there are connected to a 24 volt Inverter the capacity will be 200ah. Total cost N135,000

A 12 Volt Inverter connected to a signal 12 volt 200ah battery , will give you the same run time and backup capacity as two 12v 200ah batteries connected to a 24v Inverter. Total cost N80,000

In reality my 12v Inverter with a 400ah capacity battery bank takes less than 12 hours to fully charge on most days, How? On any given day i only use half the capacity of the battery bank, and before it gets to half NEPA usually brings light and charges the bank back to full.. Now it does not always work that way because sometimes NEPA can take light for days, in such worst case situations it takes less than 16 hours to fully charge. It will never take the 20 hours suggested by the formula 400/20 because it is assuming that the battery bank is fully discharged, which my Inverter will never allow. When it it gets to a certain rate of discharge the alarm goes off.

12 hours may be considered to long for some, as many have already elucidated , the long charging hours are easy to mitigate , by buying an external charger , in which case 12 hours could easily become 6 hours or less and you will still be spending less than you would on a 24v system.

adanny01:
I get the point.

Example: there is this certain inverter of Prag brand in 2 variants both 4kva with 30 charger and cost the same 165k. The only difference is one is 24v the other is 48v. Lets say i have 4 12v batteries of 200Ah.

1. 24v will give 2S2P arrangement to get 24v 400Ah. This will take 13.3hrs to full charge and store 9600wh

2. 48v will give 4S arrangement to get 48v 200Ah. This will take 6.7hrs to full charge and store 9600wh

Am I right to say there is no point or benefit of buying the 24v inverter when it simply slow down charging. It also means as much as possible we should avoid connecting batteries in parallel as it will take too long to charge. It also means if am to advise a user who already has a 48v inverter and plans to upgrade the battery bank to 8 12v batteries to better plan for a 96v inverter too.

This is interesting.

This is interesting, for me bigger does not always mean better. Recommendations will always differ based on individual Use Cases.
I have a setup which consist of a 12v Inverter with two 200ah deep cycle batteries connected in parallel, making a total of 400ah. The run time in my 3 bedroom flat is approximately 48 hours. The setup cost 135,000.
Could you please advise on how much what you are postulating cost, and also how many hours a day it will run for, before the alarm goes off?

adanny01:
Thanks for this. There is one little mathematical error as 440 divide by 20 is 22hrs. I believe you have more practical experience than me so i want to ask a practical question after believing this calculations are correct.

Senerio 1 Lets take the set up in concern as consideration. 2 x 220Ah in series with a 2.4Kva 24v inverter and a 20A charger.

The battery bank gives 24vdc and 220Ah. 220÷20=11hrs

Scenerio 2 Assuming the 1.2kva 12v with 20A charger connected in parallel to the same battery bank of 2 x 220Ah

The battery bank gives 12vdc and 440Ah. 440÷20=22hrs

Question: how possible is it practically that by mere connecting the bank in series it takes 11hrs but in parallel takes a whopping 22hrs when the charger and battery remain unchanged. I find it odd.

Your Welcome!

Connecting the batteries in parallel will double amp hours and will also as a direct consequence double the charging time, but here's the rub it will also double the run time. If for example your two batteries connected in series gives you 24 hours run time, then the same two batteries connected in parallel will give you 48 hours. in theory. Practically we would also need to take into account efficiency losses.

adanny01:
My guess is you have 2 of those batteries which is 440Ah.

Mercury 1.2 and 2.4kva both come with 20A charger. 440Ah÷20A=22hrs

So you need 22hrs of constant grid power (NEPA) to charge fully.

The charger is simply inadequate for your battery. You can purchase an external charger of something like 60A or better still 80A.

440/60 = 7.3hrs or 5.5hrs with an 80A charger.

With the Mercury Inverter 2.4kva (24 volt)http://www.mercurydirect.com.ng/mercury-inverter-2-4-kva-user-manual/, the two Mercury Tubular 220amp beauties need to be connected in series to generate the required 24 volts. Since connecting two batteries in series will double the voltage but keep the amperage rating the same, his battery bank will be 220amp. 220Ah÷20A=11hrs
60A charger 220/60 = 3.6hrs
80A charge 2.7hrs
With the Mercury Inverter 1.2kva (12 volt), the two Mercury Tubular 220amp beauties need to be connected in Parallel, because only 12 volts is required. Since connecting two batteries in Parallel will double the amperage rating but keep the voltage same, the battery bank will be 440amp.
440Ah÷20A=22hrs
60A charger 440/60 = 7.3hrs
80A charger 5.5hrs

Arnod007:
Please does your battery bars used to reduce as you are using it or it will just remain in 4 bars.

The battery bars should reduce as you are using it and they should increase while charging till you have four solid bars with no flashing. What is the make, type and age of the batteries you are using ?

brunofarad:

God Help Us

Could Nigeria be the next major oil producer in Africa to devalue its currency? Traders in the currency’s forwards market seem to think so.

The three-month naira non-deliverable forward price climbed to 238 on Thursday, its highest point since mid-February. The Abuja-Based central bank has held the naira at 197 to 199 per dollar since early March, but recent comments by President Muhammadu Buhari and further falls in oil prices have prompted speculation the central bank could change policy. NDFs are more accessible to foreign investors because they’re traded offshore and exempt from local dealing restrictions on the currency. Africa’s other main oil producer, Angola, devalued earlier this week.

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fistonati:
STOP complaining, just fix it.
Obama didnt complain, he looked for and found ways out

The problem is, there is no way to Fix it !

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According to the National Leader of the All Progressives Congress (APC), Bola Tinubu, Nigeria’s economy has ‘collided into a merciless and immovable wall’.
Tinubu made the remark on Thursday, December 17, 2015, via a statement released by his media office.
The statement reads in part:
“For decades, Nigeria danced in close confines with economic disaster. In the past, higher oil prices allowed us to dodge the worst.”
“We have survived but not thrived. Improvised but not planned. Spent but not invested. Laughed, drank and feasted but did not build, construct or maintain.”
“Now, Nigeria has collided into a wall, merciless and immovable. The present downturn in oil prices may be more than just a transient slump in the business cycle.”
“Nigeria needs economic liberation. Before we can free our economy, we must free ourselves of the economic myths consigning us to our current predicament.”
Tinubu’s statement comes at a time when the Naira is selling at 280 to the dollar and 405 to the pound.
Meanwhile, the Minister of State for Petroleum Resources, Ibe Kachikwu has said that the country can no longer afford to fund its oil and gas sector.

http://pulse.ng/local/tinubu-nigeria-s-economy-is-in-serious-trouble-apc-leader-says-id4478027.html

Nigerians are so mypoic its unbelievable. This policy will dmaage the naira, and worse, the entire Nigerian economy in the long run.

Not in the long run, but in a matter of months. There's a storm coming! You and your friends better batten down the hatches, because when it hits it is going to be Hell. Nigeria's foreign exchange reserves stood at $29.10 billion by Dec. 30, how long do u think it will take for that to disappear ?

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5% Off The Mercury 2.4kva Complete Inverter System- Nairaland Coupon Code:72714

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