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solar power plant
christian
#1 Posted : Saturday, November 07, 2009 12:32:00 PM
Rank: Member


Joined: 6/2/2009
Posts: 31
been trying to get into this business and finally I have one foot in.
I need advice from you OH LEARNED FRIENDS!
I have a request from a potential client to supply them with a solar solution on a large scale basis.
I have been requested to present a proposal for a solar plant that can produce upwards of 415 volts (three phase).
My client is adamant it has to be solar and am doing my research on this..
I need contacts of guys who have been able to do this.
I have heard of companies running purely on Solar for their daily processes (flower farms,heavy commercial industries etc..)
what say you guys? is it possible? who do you know that's doing this I could talk to for more insight?

Why??
wanyo
#2 Posted : Saturday, November 07, 2009 5:31:00 PM
Rank: Member


Joined: 9/28/2006
Posts: 102
@christian,as you await with a reply from an experienced guy you should note the following:

- Know the client power demand in (Kwh). Multiply all the loads by their running hours per day. Include an allowance of future load increase and location (geographical location determines the effective sun hrs per diem). The final figure will be used to dimention the system.
- use the Power demand to calculate the no. Of solar panels & rating and also to determine the 3-phase inverter ratings.

then u will be almost done
i too
Grip
#3 Posted : Saturday, November 07, 2009 6:46:00 PM
Rank: Member


Joined: 9/23/2007
Posts: 12
Christian,I represent a South African((products are manufactured in the US) company who deal in Solar products including street lights. Contact me on mbrjoh002@gsba.uct.ac.za for details if interested. Thanks

Impossible is Possible
mukiha
#4 Posted : Monday, November 09, 2009 8:23:00 AM
Rank: Elder


Joined: 6/27/2008
Posts: 4,114
@christian;

Presumably,the 415V implies that you are looking for a 3-phase output at 240Vac per phase.

That is not a problem. The issue you have to be extremely careful about is the POWER and ENERGY requirements of your client.

So find out the number of kVA required. This is NOT equal to to kW rating of the devices,especially if there are inductive loads in the system - e.g.,motors,solenoids etc.

May I ask; why is your client insisting on solar while other renewables could prove cheaper. have you considered wind,for example?

Behind the gardens...Behind the wall...Under the tree (Including: Red...Dark Blue...Yellow)
Nothing is real unless it can be named; nothing has value unless it can be sold; money is worthless unless you spend it.
Kaigangio
#5 Posted : Monday, November 09, 2009 9:02:00 AM
Rank: Elder


Joined: 2/27/2007
Posts: 2,768
@ Christian,

In order for you to determine the size of your client’s pv requirements there are two ways in which you could go about it.

The first is to request for the latest electricity bill from the client and analyse the average load from the total kwh consumed. This is not a recommended method because it is very inaccurate and does not give the worst case design parameters as required.

The second method is to carry out an on site load inspection of the electrical services installed in your clients facility and note all the load details. From here you can determine the total connected and diversified load which will help you to determine the total output from the intended pv system. It is also worth noting the current overall power factor of the existing electrical installation.

Please note that the size of the pv arrays needed will determine the mounting area required (either the roof or the ground). therefore it will prudent for you to inspect and determine the available roof and the free ground spaces areas. otherwise you may come up with a pv array for the required pv power supply needs with no roof or ground space to mount them!

again the surface area available will also determine the type of pv technology that may be used as the pvs are of different types...

NEVER TALK OF A RHINO IF THERE IS NO TREE NEAREBY - ZULU PROVERB
...besides, the presence of a safe alone does not signify that there is money inside...
Kaigangio
#6 Posted : Monday, November 09, 2009 9:02:00 AM
Rank: Elder


Joined: 2/27/2007
Posts: 2,768
@ Christian,

In order for you to determine the size of your client’s pv requirements there are two ways in which you could go about it.

The first is to request for the latest electricity bill from the client and analyse the average load from the total kwh consumed. This is not a recommended method because it is very inaccurate and does not give the worst case design parameters as required.

The second method is to carry out an on site load inspection of the electrical services installed in your clients facility and note all the load details. From here you can determine the total connected and diversified load which will help you to determine the total output from the intended pv system. It is also worth noting the current overall power factor of the existing electrical installation.

Please note that the size of the pv arrays needed will determine the mounting area required (either the roof or the ground). therefore it will prudent for you to inspect and determine the available roof and the free ground spaces areas. otherwise you may come up with a pv array for the required pv power supply needs with no roof or ground space to mount them!

again the surface area available will also determine the type of pv technology that may be used as the pvs are of different types...

NEVER TALK OF A RHINO IF THERE IS NO TREE NEAREBY - ZULU PROVERB
...besides, the presence of a safe alone does not signify that there is money inside...
christian
#7 Posted : Tuesday, November 10, 2009 7:18:00 AM
Rank: Member


Joined: 6/2/2009
Posts: 31
Looking at it guys. this is really interesting and your comments are really helpful.
Mukiha: I had a long chat with my client and WInd is also an option. We might decide to go all out and have a hybrid system. I hear its being done somewhere in Kenya,I need to know where.
Kenya is very windy in some places and in some places there isnt much,I had a chat with a Kengen Technician a few days ago,and the draw back here in Kenya is there isnt a conclusive survey (report) on Wind in Kenya. Hence getting the right spot might be tricky.. Ngong is still a study in progress though producing almost 6-7Mw. to the Grid

On the other hand,the cost of the materials,whether solar or wind is just crazy. WOW!
Anyone knows suppliers of this materials and at a good price?
AM still open to your suggestions and ideas.


Why??
mukiha
#8 Posted : Tuesday, November 10, 2009 8:09:00 AM
Rank: Elder


Joined: 6/27/2008
Posts: 4,114
@Christian;

Contact Electrical Distributors Ltd,[talk to Amrish - 0722829105 OR Omosh - 0733588551]. They have been installing Salr/Wind hybrids for Orange Telkom remote BTSs.....Marsabit,Laisamis,Kajiado etc

Behind the gardens...Behind the wall...Under the tree (Including: Red...Dark Blue...Yellow)
Nothing is real unless it can be named; nothing has value unless it can be sold; money is worthless unless you spend it.
Mkimwa
#9 Posted : Tuesday, November 10, 2009 7:10:00 PM
Rank: Member


Joined: 10/26/2008
Posts: 380
There was this school - some academy in Rwai i think called blue hills academy,featured today in NTV business program. They run on a combo of solar and wind.

Solar panels and wind turbine charge a battery farm,connected to some inverters,then connected to the distribution unit for feeding to the consuming equipment. He mentioned something like 2KW,not sure of the exact figure. but 2KW did not make sense,because thats not even enough power to light an energy saving bulb. Probably meant 2MW.

Perhaps you can give them a visit,and see how it works. Pretty simple setup,but it can give you ideas.
mukiha
#10 Posted : Wednesday, November 11, 2009 8:15:00 AM
Rank: Elder


Joined: 6/27/2008
Posts: 4,114
@Mkimwa;

2kW is 2,000W....a lot of power,it can light up over 30 regular 60W bulbs....or 200 10W energy-saving bulbs.

Most domestic solar panels average only 50W...yes hamsini!!

A 2MW unit would be a serious overkill for running a school....unless they want to power up neighbouring villages!!!!

Behind the gardens...Behind the wall...Under the tree (Including: Red...Dark Blue...Yellow)
Nothing is real unless it can be named; nothing has value unless it can be sold; money is worthless unless you spend it.
ispoa
#11 Posted : Thursday, November 12, 2009 7:39:00 AM
Rank: Member


Joined: 8/6/2009
Posts: 71
dude 2MW is enough to power a town like Ngong at PEAK consumption.

I think the issue raised on the peak requirement at anytime is is of utmost importance.

For instance fridge may not be consuming much but may require as much as 2-3KW for abt a min or so due to the power the compresor requires to keep stuff chilled which again is dependent on how many times its opened,which in turn would keep raising temperatures and need to engage compressor to maintain levels of cooling.

If your client uses air conditioners you may need to factor in peak consumptions in your calculations


When you do the common things in life in an uncommon way,you will command the attention of the world.

***********************

Indecision and delays are the parents of failure.

Mkimwa
#12 Posted : Thursday, November 12, 2009 2:03:00 PM
Rank: Member


Joined: 10/26/2008
Posts: 380
@ mukiha - you are right..

so it must be 2KW or thereabouts.
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