GeorgeD1:
sathob,

i think there is a fundamental error in your calculation which does not account for battery depth of discharge and the fact that amp-hours is same as watts (power).

going through the calculation again, a 12v battery of 84ah will supply a total of

1008watts (84x12)

but that is 100% of stored energy and by extracting all 1008w we will be draining the battery completely flat (which is not advisable). so we stick to a battery depth of discharge (d.o.d) of 80% and this translates to

(1008 x 0.8 ) = 806.4w

so, we can only extract a maximum of 806.4w from this battery instead of 1008w.

now, ignoring system losses (wiring, battery internal resistance, inverter efficiency, etc)

150w load will give you a total run time of:

806.4w divided by 150w. this equals 5.376 hours,

which is exactly 5hours, 22mins.

c0ogumo:
********** SOLAR DEPOT NIGERIA ***********

For those in doubt about US Battery, please check out the specs link below.

http://pdf.wholesalesolar.com/battery-folder/usbattery/RE-L16.pdf

Email: info@solardepotng.com Mobile: 0803 260 2629
www.solardepotng.com

abunafiu:


I honestly believe no one is doubting the US batts. Most of us including myself are always afraid of change. I have personally r esearched the US batts and I discovered its no diff from our beloved trojan.
Let me share my experience:
pls note: all I write here 2nite is my personal opinion and does not in any way mean I am 100% correct.

Few months ago, I discovered one of my trojans had an internal injury which made the batt read zero volt. I tested all 3 cells and discovered one of them is not connected. (I don't know what caused it).
I knew that if I open the battery, ill be able to fix the problem. As an academician, I began seroius research to find out how the internal structure of the T105 batt look like. My research led me to us batts. I can boldly say that" its either trojan copied us batt or vice versa".
I used the schematics I found from us batt to repair my failed T105 . I observed that both batts are d same in cell technology and internal design. it contained all the feats advertised by trojan. I dont know who is copying who among the two giants.
I even saw a video of how us batts are made but trojan kept theirs a secret. Trojans remain the market leader maybe because of their "packaging" but I believe us batts are similar to trojans.
I hope to use the us L16 for my next client.
Though, I don't think I have ever posted on this forum that I install for people but by d grace of God, I'll do this with us batts to show everyone that there's nothing wrong with them and I personally is not in doubt.
I am aware a friend (pharyn) is likely to be the first to use them within the nairaland solar forum, I want to encourage him to tell us how it went since he has now tasted both worlds.

And for those who cant afford both usa batts, I can boldly say that the mercury tubular being peddled by that aggressive marketer is a very good alternative. I had d privilege of installing 12 units of them with 15 units of 300w yashi mono panels and the result was impressive. I took time to observe the cells and was amazed as I doubted if they were mercury or trojan L16. (pls don't argue except u av seen both side by side).
But I have a strong feeling that mercury may reduce their standard in subsequent batches but the MADE IN USA BATTS(trojans and US) can never compromise standard.

JUO:
Hello friends.
I hereby introduce this piece of a gadget to you.
I have been testing this small but mighty machine for over 3 weeks now.
The results turns out to be impressive.
I have a few number of them for sale to anyone interested.

It is 30 and 40amps mppt controller with additional features of equalization of flooded batteries 28 days and inbuilt display .

New Epsolar Tracer A series available. For small setup 12-24v. . Max pv input voltage 100v. 30a only 25k for the first buyer
Features:
• Advanced MPPT technology
• High tracking efficiency no less than 99.5%
• Peak conversion efficiency of 98%
• Ultra-fast tracking speed
• Accurately recognizing and tracking of multiple power point
• Multi-function LCD displays system information intuitively
• User programmable for battery types, load control etc.
• 3-Stage charge with PWM output
• Common positive grounding design
• RS485 port with industrial standard MODBUS open architecture
• Fully programmable function via PC software or remote meter

Electronic protections:
• PV reverse polarity protection
• PV short circuit protection
• PV over current alarm protection
• Battery overcharge protection
• Battery over discharge protection
• Battery reverse polarity protection
• Load short circuit protection
• Load overload protection
• Overheating protection

N.B Remote not included
o8o-987-33709

JUO:
I think cell efficiency will be the difference. But one must outlast the other

BUTONEDAY:
@ George_D,
I have been trying to get in touch with my battery supplier in Lagos but could not at this moment. I think he still have some 260 Amp hour batteries. One 260 amp battery weighs 80kg

@ All,

Some tips to make your batteries last longer.

1) Recharge your batteries slowly (using automated charger/charge controller). Do not take your batteries to local battery chargers by the road side.

2)  Recharge a your batteries as soon as possible after each use to prevent sulfation.

3) .High ambient temperatures will shorten your battery life. Store in a cold dry place. Not in the fridge.

4)  Avoid draining your batteries too deep if you do not have deep cycle batteries. Shallower depth-of-discharge will increases your battery life.

5) When in storage, recharge when the state-of-charge drops to 80% to prevent lead sulfation.

6) Do not mix used batteries with new ones. The used batteries will act as load

7) keep your batteries well maintained. Clean the terminals when required.

Conduct regular routine battery discharge test.

9) Never discharge below 10.5 volts.

Expertt:
Hello Gurus in the house.what is the advantage of 48v inverter system over a 180v inverter system. I saw an advert of a sukam 10kva/180v inverter that is cheaper than prag 5kva/48v. Please your professional advice is important. Thanks.

Expertt:
Hello Gurus in the house.what is the advantage of 48v inverter system over a 180v inverter system. I saw an advert of a sukam 10kva/180v inverter that is cheaper than prag 5kva/48v. Please your professional advice is important. Thanks.

chris81964:
Today we finished another installation in Port Harcourt. We used the US batteries for the first time. They are rated highly in the United States. We will keep you posted.
This 3 kva comes with a 60 amp AC charger and a 40 amp MPPT controller. At 11 am we were seeing 750 watts from 1500 watts in panels on a not very sunny day.

Konnektions146:


Nice one Boss.

Weldone!

chris81964:


Thank you sir. We appreciate

DUNKA:
please which inverter is that in the installation?

chris81964:
Today we finished another installation in Port Harcourt. We used the US batteries for the first time. They are rated highly in the United States. We will keep you posted.
This 3 kva comes with a 60 amp AC charger and a 40 amp MPPT controller. At 11 am we were seeing 750 watts from 1500 watts in panels on a not very sunny day.

chris81964:

Axpert Mex. It has the 60 amp AC charger and 40 amp MPPT charger for a combined 100 amp total. I have two more left.

chris81964:
Busy last three days. Installation in Ogun state. Client is off grid

Saipro:


I like the answers you have been given and everyone is right. Your controller should more frequently see in the range of 33A to 38A and occassionally, 43+A. For a 48V system, your configuration is perfect (efficiency rises as you narrow the difference between Vmp and nominal system voltage. This might however not be the case in instances of long distances from the panels to the CC (often quoted as in excess of 30m - 50m, depending on autority and other parameters). High voltage = lower transmission loss and this can often offset whatever gain you hope to achieve by using strings of 2. My system is similar to yours (250W x 9) in three strings of 3 for a nominal 48V system. It works the CC a bit more (a Midnite Classic 150) but I have no worries on the transmission efficiency over a 10m stretch using 10mm² cables. Those are the academics of the logic.

Back to the question, if your cables are the right size (10mm² or higher), go for the 4 strings of 3. If your cables are smaller, you might want to consider 3 strings of 4.

JUO:
please request for the remote if needed

Optimixim:
. I have worked closely with this axpert inverter closely, and the 3kw seems to get burn when a certain charging amps passes through it (DC current). I have so many cases cos I worked in a company where I handled both installation and maintenance, chris81964, did you got yours recently cos that company stopped the importation for some time now, the i-power inverter sold by zinox is same with axpert though they have corrected the error, another problem I experienced is that the paralleling of 3 units to form a three phase system do fail on synchronization, I met with the chinese chipmunks who does the manufacturing, they said that I need to upgrade the malware. So I now get my axpert from other source but now going for i-power which I have installed series of both,and still on close monitoring. Pls chris81964n if you have any experience with axpert, share here. Thank you

Optimixim:
. I have worked closely with this axpert inverter closely, and the 3kw seems to get burn when a certain charging amps passes through it (DC current). I have so many cases cos I worked in a company where I handled both installation and maintenance, chris81964, did you got yours recently cos that company stopped the importation for some time now, the i-power inverter sold by zinox is same with axpert though they have corrected the error, another problem I experienced is that the paralleling of 3 units to form a three phase system do fail on synchronization, I met with the chinese chipmunks who does the manufacturing, they said that I need to upgrade the malware. So I now get my axpert from other source but now going for i-power which I have installed series of both,and still on close monitoring. Pls chris81964n if you have any experience with axpert, share here. Thank you

chris81964:


The oldest I have installed is 2 years old. The fan failed and it is still working. The 3 Kva is more reliable than the 5 Kva. I have the 5 Kva paralleled I initially had a software issue. I did the upgrade and it worked for a while. One of the units developed an issue with nepa. It goes nuts when it sees nepa.
I import mine. They have yet to burn out from charging. They shut down when they get too hot. The common problem is a locked or failed fan
If they don't fail at the beginning they do last.

durodee:


My inverter is almost 2 years old now. A 3KVA,30AMP AC charger with 50 amp PWM CC . Doing great except when i connected to NEPA and it caught fire within 2weeks. NOT SMELL OF BURNING WIRES O! VISIBLE VIGOROUS FLAMES!!. Worked fine for months with Gen charging before that fire issue. Fire went out soon after NEPA was disconnected. The inverter does it job well now (inverting only) without any trouble but i have not tried the PWM to check if still functional. I have other MPPT chargers but lost the automatic change over capability

chris81964:


Sorry to hear. That must have scared the PEE out of you. I have them all connected to NEPA. So far knock on wood. This is the second I am installing using the inbuilt charger. You have to follow the instructions from the manufacturer when you connect them or they don't work. (the inbuilt charger)
Yours is battle tested

durodee:


My daughter thankfully saw it early enough and raised the alarm. EXCELLENT inverter before that episode; withstood numerous insults prior to that and even more after!!!!
Can I inbox you later please?
Thanks.