How did this kind of post get to the front page. Content not readable. What's NL turning into... ..

My advice to you young folks out there, '' you are addressed the way you are dressed'. Why would a man have dreads on all in the name of fashion. That alone(having dreads) is a PISS OFF and could attract wrong status to you.

hello,how many grow-out catfish can be bred in each pond?
regards

Good morning OP.
Nice business model you have here. Kindly send your catologue to aphizaa@gmail.com.
And please update if the cost of set up is still as posted earlier.
Many thanks

ishaqteejay:

Firstly where Do you stay?
1). it should be 2feet to 2.5feet between rows nd line up the sack within the row.
2). Top soil,cow dump,black soil@ ratio (2:1:3)
3). just a little becaus it is already done for you (cement bag)
4).I will like you to try using drip even local one if you have the means.

Thanks for the response. I stay in Lagos.
1) noted I would do that.
2) do the manure(cow dump) comes as already dried or i buy wet and dry myself.
3) noted
4) I would try drip on a larger piece of land later. If I do that now, my landlord might feel intimidated n increase my house rent.
Thanks

Good job ishaq. More grease to your elbow. I want to try this sack farming on a small piece of 3m * 8 m space in my compound. I have the following questions:
1) what no of rows would you advice and no of sacks per row.
2) can I mix the soil with fertilizer before filling in d sack. (If yes, ratio n fertilizer type)
3) do I need to perforate the bottom of the sack so as to reduce water content when there is excess rainfall.
4) for this small setup, do I need irrigation setup. Can't I just wet by sprinkling water.
Thanks as I await your response.
Regards

Good topic op. Where did you source the soil? Did you buy?.
Can't wait for or new topic on watermelon

Barezzi:
@ Schneid,
Can the alarm buzzer be replaced with a relay/contactor?
i'd be very interested in your device if it can drive a relay in addition to alarm annunciation.

Hello boss. Yes, it can be configured to suit your purpose. Just a little bit of adjustment to the circuit. It can also be wired directly from the tx unit if the distance is not much thus eliminating the use of the RX unit. Your requirement would determine what adjustment is to made.
BR

Hi,
I have these stuffs for anyone interested at giveaway prices.


1) inverter cabinet : for those who build inverters. ideal for 3.5kva-5kva capacity : N8000
2) battery rack (plastic) : for battery housing . suitable for just one battery : N4000
3) battery rack (mettalic) : for battery housing . suitable for just one battery : N6500

BR
PRAGMAR 08030504455

Hi All. I have this device i designed for battery monitoring. Its called Automatic Low Battery Alarm System. It can be used to monitor battery banks remotely via your mobile phone. It is ideal for situation where you need to get alert when your battery bank is getting low and you need to recharge the batteries. It can send out sms message at a preset low bat value. E.g You want it to send alarm at 11v for a 12v system , or ....... or 176v for a 192v system.(ANY POSSIBLE VALUE AS REQUIRED BY CLIENT IS PRESET) . It will also send battery full sms alert at a preset battery full condition.

As an option, it can also send rf signal to its paired RX Unit over a distance of about 200meters. E.g from main office building where you have your inverter to the generator house/security house/utility office for prompt alert.


THE MODULE
1) TX Unit (for monitoring battery and sending SMS and RF signal)
Consist of gsm module, rf module, lcd display, calibration knob, inbuilt device battery and circuits
2) RX Unit (for receiving signal condition low battery/battery full)
Consist of led display, alarm buzzer, inbuilt battery

APPLICATION
Anywhere power outage is critical (e.g server room)

REGARDS

PRAGMAR: 08030504455, 08052214265

Hello,
I would like to introduce the "GSM BASED AUTOMATIC LOW BATTERY SIGNAL ALARM" system.

In certain circumstances where constant backup power is required, inverters are usually deployed. As we all know, the functionality of inverters are dependent on batteries. At a point during inverter usage, the battery low condition takes place and the inverter shuts down.
Most inverters are designed to give beeps when batteries are getting low and needs to be recharged before the inverter actually goes off. There are scenerios where you dont want this to happen even when you are not there to monitor the inverter. E.g on weekends, public holidays where you expect your SERVERs to be up 24/7 and no one is available to monitor situations; the GSM BASED AUTOMATIC LOW BATTERY SIGNAL ALARM (ALBSA) has been designed to monitor situations and send you report via gsm means of communication. The ALBSA can send you both BATTERY LOW and BATTERY FULL conditions.The system also has an alternate communication mode which is the RF.

The ALBSA consist of 2 units devices (the TX UNIT and the RX UNIT)

TX UNIT
This device consist of a gsm module, RF module (tx) , circuitry, inbuilt battery, monitoring points and lcd display. The device is pre-set to monitor battery voltages (low and high). on detection of this voltages, it sends gsm message to your mobile device informing you of the situation. subsequently, it sends RF signal (low or high) to the RX unit. The Rf signal can go as far as 200meters.

RX UNIT
This device consist of the rf module (rx), inbuilt battery and buzzer. On receiving signal from the TX unit, the buzzer alarm comes On informing you of the condition of your batteries. The RX unit can be installed at the gen house to inform the generator man to either switch ON/OFF the generator providing power to the inverter for charging its batteries. As an option, it can be configured in auto mode to power ON/OFF the gen.



As we know, most inverter manufacturers set the battery low cut off to 10.5volts per 12vdc design, it means for a 24dc inverter it cuts off at 21vdc. For 16 batteries inverter, the cut off voltage is 168vdc. With this device, we set the battery low voltage to 11volts per 12vdc. such that at that instance, you receive the gsm/rf messages, a proper measure is taken to Power ON the gen for charging. Thesame principle is applied for battery full condition at 13.8vdc.


WHO IS THIS DEVICE USEFUL FOR
All oranisation whose activities depends on constant power supply 24/7 workdays/holidays.

Hi, Good job you are doing bro. Am interested.
08052214265
aphizaa@gmail.com

Elcemento:
Beauty and brains.

I sight you my friend. CodedlyCodedly

richmon74:


Hmmm.
The mounts and the panels have been completed. Its only wiring and configuration of the SMAs that is remaining

Noted boss. When next you have a fresh job, I ll be glad to join you.
Meanwhile, with the arrangement shown in the pictures, what are the direction of those panels because I can see opposite directions. By standard it should face south.

Thanks. Noted

I stumbled on this thread today and I am so impressed by the op's wealth of expertise on this subject. I read each post from page 1-10. Good job. I do solar stuffs too but I can agree u r d boss.
I read where you mentioned where solar brand name should not be the real deal but the chip manufacturer. I rely so much on solarworld module (255watt @N65k), outback charge controller, morning star. From your experience, kindly recommend a cheaper alternative in terms of cost without compromise to quality for the items mentioned. Products/prices/supplier? Email: aphizaa@gmail.com. thanks as I expect feedback

richmon74:
The Election wahala halted our work today. We ended up just mounting the cable trays, webbox, control panels pv & battery fuse boxs and positioned battery in place.

Few hours wiring and configuration remains.

watch and like our facebook page for more pictures soon.

Good job Oga Richmond. Just reading this though and I thank God the election wahala halted your installation because I would have missed out. I wish to see those SMA in action and the sunlock Mount installation. I hope to join you next week when work resumes. Cheerio bro

Hi dear. Scientifically, it does not mean ALL your kids will be short. Is everybody in your family or his family short? It has to do with the dominant and recessive genes. Its possible you and your guy both have recessive genes for tallness and this might become dominant in ALL or some of your kids. In summary, its a 50% thing. If you love him, stick to him.

c0ogumo:
@ Schneid

I am sorry to say but this is not a DIY installation.
Please consult a professional otherwise, you would be throwing money into the drain.
We do not know how you come across the load you presented...therefore, cant really say if your calculation is right.
Some calculations don't really apply in real world. You need to answer few questions before pointing you in the right direction.

Please use my contacts below.
Thanks.

Pls check your inbox. Thanks.

pheleix:

You don't need to double the ba3 for the system voltage. From your calculations you need 38 and not 76 pcs of ba3
Total Ah/ba3 Ah = Total No of ba3s

Thanks for the observation.

c0ogumo:


I will strongly advise you to go for a 48V system. I can help you get a 48VDC to 24VDC converter for the DC load.

For the Charge controller, FM80 24V @ 80A = About 2000W for each charge controller
Thats a waste of money if you go with 24V system.
You could buy 2 x FM80 or Midnite Classic 150

Hope this helps

Thanks.
How much would that cost and what is the rating of the converter?
Suggest the solar and battery sizing. I would have loved to use trojan 6v/410 for my design but the clients doesn't want it.
So far, no one have mentioned if my calculations on sizing is the right procedure.
Thanks as I hope for more options.
BR

Barezzi:

There are 2000Ah 2v batteries...
Buy 36 in 3 parallel strings for 6000Ah.
Those batteries cost an arm and a leg each, but since money ain't an issue, u might wanna consider it.

For the batteries, what is the brand and how much. Also suggest controller capacity and no of panels.
Thanks

bodejohn:


Perfect, a reasonable option.
Is the pump AC or DC?
You just have to be careful with high DC currents, they are dangerous.

Your efficiencies might also well exceed 90% since there will be no power inversion.

On the side, is your client building a poultry farm?

For the lights. Its for a factory premises.

For the pump, its for production purposes. (AC pump)


Money is not the issue here.


I just want to confirm if my calculation parameters n methods are in tact.

Thanks

bodejohn:


Are the loads purchased already? if not, I suggest you go for 220v power so you can go higher on the battery voltage. It might save you some more costs.

Same for the 30HP pump. You will be able to run it on a VFD and prevent the expected starting current...

Yes the loads are existing. Both for the lamps and pump.

As a way out, I might have to split the load into 3. That way I can have 1200watts each and then size each load separately.
What do you think?

bodejohn:
@ Schneid, it will be near impossible to charge 38 strings of battery adequately.
It is even advisable not to go beyound 3 or 4 strings.
You will definitely need to step up that battery voltage to 48 or 96V so that the number of the strings will be reduced.
I think you were also too optimistic about the efficiency of the system. 85 or 90% will be reasonable.

On a lighter note, are you going to finance that project with a World Bank loan or is it FG sponsored? 78 batteries at 60k each will be 4.6M.

Thanks BodeJohn,
Increasing system voltage won't be possible because its a 24DC load (DC lamps)

I can adjust efficiency as u suggested.

I might have to reduce autonomy to 1.5days

I might have to increase DOD to 75%.

All these above just to reduce cost.

Hhmmmm World bank? Its not a personal project but the owner should be able to fund it.

Thanks

Here I am again [sup][/sup] my professors in the house. Am not familiar with water pumps been powered with solar. I know of grundfoss DC pumps but not the AC pumps.

My challenge.
Am to power a 30HP AC pump with solar.
30HP will give me (30 x 750) = 22500watts.
Been an inductive load , am looking at pf of 0.65. This therefore means my apparent power is 22500/0.65 = 34615.38VA.

And considering starting current which might be up to x 3. Kindly advice on this project with the following.

This system is expected to be TOTALLY off grid and running 24/7.

Inverter capacity? Brand and system DC voltage .

Solar and battery sizing?


Thanks as I await your professional suggestions.

Best Regards

Top of the morning to you solar geniuses in the forum. Kindly view my sizing below and assist where possible.

Power requirement= 43200WH
At 97% efficiency/losses = 44536.08WH
Using 24DC system, AH required= 44536.08WH/24 = 1855.67AH

At 50% DOD = 3711.34AH
At 2days autonomy = 7422.68AH

Battery selection
Using 200AH batteries = 7422.68/200 = 37.11
approx 38pcs .
For 24 system (2 batteries in series) = 76pcs

Solar sizing
Power requirement = 43200WH
Assuming 5hrs of sunlight 43200WH/5 = 8640W
Using SW255w panels= 8640/255 = 33.8 = 34PCs

Solar arrangement
Strings = 2 x 24
Parallel = 17 of the strings.

Charge controller
Knowing that each panel is about 8.5A x 17 in parallel gives 137A. I want to use 2 nos of Outback FM80.


Pls kindly review my calculations and correct me before I do something crazy.

Thanks as I look forward to your professional responses.

Sir,
Do you have the cage that can be used for display on the roadside for birds sales. For about 30 birds.
Thanks

richmon74:
Application in small system installation.

Do you normally screw the L-foot to the roofing sheet material or the roofing structural member. Because I observed some L-foot are not in line with the existing roofing sheets at the points where they are screwed to the structural members underneath.

How much is the MNSPD300 and at what points of installation is it necessary?

richmon74:
This low cost device -MNSPD300 lightning arrestor- Saved the $2500 magnum inverter below from 415V supplied by PHCN on comissioning of a new transformer.

The system below has witnessed two major hits by over voltage. This time around the Lightning Arrestor did a very good job by shutting off the inverter from the excess power supply and in the process gave up the ghost just like Jesus Christ in order to save the Inverter after struggling to cut off the excess voltage for about 45 mins. The client was so happy with the protection and called for immediate
replacement of the MNSPD300.

The remains of the MNSPD300 was given a very honourable burial as it has left behind a golden legacy for it's family. May It's Soul rest in Peace.

The story continues...

Thanks Richmon. Its good news to know I can use up to 18panels practically on 1 fm80 outback. Still waiting for the client to respond. For sure am patronising you for all my . [stuffs . Thanks always for your contributions here. quote author=richmon74 post=30014306]

I usually don't like commenting quickly on this kind design posts for a couple of reasons. I usually allow others to do so first while I read. One of the reasons is that I don't usually comment is the fact that the actual applications from my experiences might differ very well from the theoretical designs.

Like Barezzi and c0ogumo has calculated for you, sometimes you will see that if you want to follow the actual dos and don'ts according to the theories you won't install solar.

As a man in the field, the truth is your configuration is perfectly ok for the real life practical application. You'll be shocked that you will hardly run your battery bank (which is theoretically incomplete) down to 50% as long as you have that amount of solar panels installed. This config will run off-grid without any stress. Reason being that you'll learn and adjust your load as time goes on.

Now for the question of if you have to use one cc. Just like I said before that if you want to do all that the solar theory says you won't install solar. The manufacturers of the CCs calculates the number of panels the cc can carry by the rated current carrying capacity and that is why Barezzi said you can load up to 15 panels. But the solar standards say you should leave a head room of about 30 to 40 percent on the cc current capacity meaning if you are using an 80A cc the max load on it should be in the region of 3kw as in your design.

In actual application, I have loaded 18 255W solar panels on an Outback FM80 charge controller (theoretically wrong) on more than one installation site and it works effectively. Why? The reason is simple, it is only very few minutes in very few days of the year that the power output from the panels will hit 100% and above (as in the case of Solarworld Panels) and in such cases the cc will simply clip the excess current and no harm is done to no one. Those moments are very few that they are insignificant. For the remaining larger part of the day/year the output power will remain within the region of 80% (that's about 76A) peak which is safe for your CC operating level.

In summary, you can install up to 18 panels on FM80 should you want to cut cost as you said.

Also remember to use professional accessories for all the stages to achieve a high efficiency.

Do not also forget to buy our Professional Solar Mounts (page 79 of this thread)

Hope this helps someone

[/quote]

Thanks barezzi and cogumo. Just like I said the battery bank is a "fix factor" here. Doubling the batteries is a suicide mission on cost.

The most important info is the use of 2 CC which is justifiable and the max array of 15panels for one CC which i believe would be the worst case scenerio if total cost would be an issue. Though 80A would be OK for the "charging ONLY " disregarding day time usage through inverter load.

Thanks again gentlemen