10KW solar system

[ribak]

Hi all
Please I need help in determining the following requirements
1. number of batteries,
2. charge controller rating (A),
3. Number of solar pannels and
4. How many KVA inverter needed for a 10KW power system for a computer centre with 30 desktops, 10 laptops, 10 fans, 30 lighting points and 10 air conditioning systems it is supposed to run for 12 hours daily.
I am new into this field and need ur assistance
with about 5 hours of sun light daily

[Sunking]

You are kidding right? How many watt hours per day will you need? I think you are in for a huge shock of your life. Right now you pay the electric company around 11 cents per Kwh. If you do this you are now looking at paying $3 per Kwh all up front in 5 year increments.

So tell us how many Kwh in a day that you need and your location and I will run the numbers for you. But I can tell you right now you are looking at a 6 to 7 digit number.

[ribak]

You are kidding right? How many watt hours per day will you need? I think you are in for a huge shock of your life. Right now you pay the electric company around 11 cents per Kwh. If you do this you are now looking at paying $3 per Kwh all up front in 5 year increments.

So tell us how many Kwh in a day that you need and your location and I will run the numbers for you. But I can tell you right now you are looking at a 6 to 7 digit number.

>with just a single airconditioning system the total load current is 43.79Amp thus the total power at 220volts VIcos# = 7707.04W where cos# is assumed 0.8 thus for 12hours the KWhr rating = 92484.48KWh
>I am located in the Gombe State North East Nigeria.
>here is a little break down of what I was able to come up with
> Inverter : 10KW rated 180v dc thus I intend to make use of two parallel connection of 15batteries @ 12V/200AH
>batteries: 200AH x 20
>solar Pannel : 4480Wp i.e 140W x 32 number of pannels
>60A charge controller

[Sunking]

>with just a single air conditioning system the total load current is 43.79Amp thus the total power at 220volts VIcos# = 7707.04W where cos# is assumed 0.8 thus for 12hours the KWhr rating = 92484.48 KWh

OK I do not how you are coming up with these numbers. If your load is 44 amps at 220 volts with a PF of .8 then you using 9.68 KVA @ PF .8 = 7.74 Kw. 9.68 Kva x 12 hours = 116.2 Kvah @ PF .8 = 93 Kwh. That is a huge amount of power. I think you misplaced a decimal point by a factor of three places.

Ok your Solar Insolation is 5.9 Sun Hours in Nigeria which is good but now the fun starts. In order to generate 117 K volt-amp hours you need to generate 175 Kvah. So that means you need a 117 / 5.9 hours = roughluy a 20 Kw solar panels array. In the USA that only cost $60,000 USD for the panels.

here is a little break down of what I was able to come up with
> Inverter : 10KW rated 180v dc thus I intend to make use of two parallel connection of 15batteries @ 12V/200AH

Doubt that will work. An air conditioner will draw anywhere from 4 to 11 times full load amps on start up. So lets say you AC unit at full load draws 9 Kw or 41 amps @ 220. It will draw anywhere from 36 to 99 Kw. If you have a undersized inverter of 10 Kw, it will trip off line anytime the AC unit comes on. So you are really looking at a much larger industrial inverter of another $30 to $50 K USD.

As for the batteries you are not even in the ball park of being close to what you need. For a system that consumes 117 Kvah per day requires 585 Kwh of storage capacity. If a 180 volt charge controller existed (it does not and would be a custom build) would require a 585 Kwh / 180 volts = 3250 AH @ 180 volts. Batteries cost roughly $140 / Kwh so 585 Kwh x $140 = $81,900 USD. Note those batteries will need replaced in about 5 years.

Next problem is a charge controller. There is no such thing as a 180 volt @ 120 amps charge controller. You could have it custom designed and built at a premium cost. I can design it for a fee of $5000, but it would be up to you to have it fabricated.

Sure you want to do this? I estimate $400,000 USD to build it if here in the USA with labor and materials. Have no idea how much the materials would be in Nigeria, but I suspect much higher.

[frazelle09]

Chin. i bet that made him depressed.

Have a great evening!

[Mike90250]

Hi all
Please I need help in determining the following requirements
1. number of batteries,
2. charge controller rating (A),
3. Number of solar pannels and
4. How many KVA inverter needed for a 10KW power system for a computer centre with 30 desktops, 10 laptops, 10 fans, 30 lighting points and 10 air conditioning systems it is supposed to run for 12 hours daily.
I am new into this field and need ur assistance
with about 5 hours of sun light daily

This is a huge project. If you dump the 10 air conditioners, and change the desktops to laptops, it may become doable. Maybe. Fans and lighting are needed. Construct the building with passive cooling in mind.

Then maybe it's workable, but 10 air conditioners is unreal.