Designing of off grid solar system

[syedbukhari]

Hello,

I am from Pakistan.I am new in solar field. In Pakistan there is a energy crisis but fortunately it is rich with solar radiations. In summer there is sun shine for about 12-14 hr a day and in the winter about 8- 10 hr a day. Kindly guide me i want to install a solar system of 1000 watt in my house, 4000 watt at my fuel station and 6000 watt a my agri form for irrigation purposes. Here is the data of my solar panel.

Rating power at STC(Wp) 220W
Open circuit voltage(Voc) 34.0V
Short circuit current(Isc) 8.58A
Rated voltage(Vm) 27.6V
Rated current(Im) 7.97A

Kindly guide me about the arrangement of the arrays, size of charger controller, size of inverter and the battery bank for 10 hr back up time for each system.
For home the average load is 700 watt hr
For the fuel station average load is 2800 watt hr but there is a problem in this load. We are using three submersible motors for fuelling and each motor takes 17 Amp at its starts up and settles down at 5 Amp . Kindly guide how can we design solar system for this complex system.
For the agri purpose we are using 5 hp AC motor. We do no need back up time in this system. Kindly guide for this system also and also inform can we use DC motor to reduce the cost of the system.
220 volt used in Pakistab
I contact with you because in Pakistan in our area electritions are using just hit and trail method for the system designing.

[russ]

No PV Watts for Pakistan so I used New Delhi, India - won't be that far off.

The usable insolation is far less than you are considering.

"Station Identification"
"City:","New"
"State:","IND"
"Lat (deg N):", 28.58
"Long (deg W):", 77.20
"Elev (m): ", 216
"Weather Data:","IWEC"

"PV System Specifications"
"DC Rating:"," 1.0 kW"
"DC to AC Derate Factor:"," 0.770"
"AC Rating:"," 0.8 kW"
"Array Type: Fixed Tilt"
"Array Tilt:"," 28.6"
"Array Azimuth:","180.0"

"Energy Specifications"
"Cost of Electricity:"," 1.8 rupee/kWh"

"Results"
"Month", "Solar Radiation (kWh/m^2/day)", "AC Energy (kWh)"
1, 5.56, 124
2, 5.90, 116
3, 6.65, 141
4, 7.01, 140
5, 6.91, 138
6, 6.34, 123
7, 5.28, 107
8, 5.25, 108
9, 5.89, 117
10, 6.17, 128
11, 5.74, 117
12, 5.56, 121
"Year", 6.02, 1479

[syedbukhari]

Thank you Russ. Can you also help me designing of arrays,selection of controller,inverter and also advice about the capacity of battery. Your help will be highly appreciated.

[Naptown]

Is this going to be grid tie hybrid systems with batteries for back up or off grid systems.
You need to come up with a total watt hour daily consumption. Preferably on a day when the power stays on all day.
If rolling blackouts are the norm how long does the power stay out for usually.
Finally on the agri business with the 5HP motor, is this a pump for irrigation?

[Mian Jee]

I am also from Pakistan & also working on small systems,

I think you will need a 4KW Solar Power System for you home,

1.Solar Panels . 250w x 16 = 4000w
2.Charge Controller. 50Amp/48V x 2
3.Inverter . 3000VA x 1
4.Batteries . 150Ah/12V x 16 = 2400Ah

Thanks & Regards.

[Naptown]

I am also from Pakistan & also working on small systems,

I think you will need a 4KW Solar Power System for you home,

1.Solar Panels . 250w x 16 = 4000w
2.Charge Controller. 50Amp/48V x 2
3.Inverter . 3000VA x 1
4.Batteries . 150Ah/12V x 16 = 2400Ah

Thanks & Regards.

Information like you posted is exactly why he came here.
There is no basis for your system as there is not enough information given to formulate a design.
I see why the OP is skeptical of the locals.

[syedbukhari]

Is this going to be grid tie hybrid systems with batteries for back up or off grid systems.
You need to come up with a total watt hour daily consumption. Preferably on a day when the power stays on all day.
If rolling blackouts are the norm how long does the power stay out for usually.

Thanks for your response. Actually in Pakistan especially in our area there is a break down of electricity after every on hour. I want to design a system in which i should have some back up at least for three hours. In this system the batteries should be charged through sun light in day time and through main grid in the night or in cloudy days. In my home system i utilizes
Four fans @ 100 Watts each is 400 Watts. Run for 16 hours is (400 * 16) 6400 Watt hours.
Six bulbs @ 20 Watts each is 120 Watts. Run for 8 hours is (120 * 8 ) 960 Watt hours.
All other appliances i runs on main grid. According to my understandings i need a grid tie system with batteries. Please correct if i am wrong.

Finally on the agri business with the 5HP motor, is this a pump for irrigation?

Yes this is 5 hp pump for irrigation purposes. I needs to run this in day time only.

[Mike90250]

.....Yes this is 5 hp pump for irrigation purposes. I needs to run this in day time only.

The pump is not going to be able to run off batteries, at least not 5 hp worth. it's way too big.

I'd suggest a diesel powered pump for the times the grid is down.

[syedbukhari]

The pump is not going to be able to run off batteries, at least not 5 hp worth. it's way too big.

I think I failed to present my point of view
In case of agri pump I am not interested to run this on batteries,i just wants its working in day light with the help of inveter . There is no need of batteries. Yes I need batteries in home and fuel station model.

[Naptown]

Please describe the irrigation system
Open ditch, pressure sprinklers, Water tower or elevated storage and drip irrigation? how is the area irrigated?

[syedbukhari]

Please describe the irrigation system
Open ditch, pressure sprinklers, Water tower or elevated storage and drip irrigation? how is the area irrigated?

Irrigation system is deep well water

[Mian Jee]

Information like you posted is exactly why he came here.
There is no basis for your system as there is not enough information given to formulate a design.
I see why the OP is skeptical of the locals.

@ Naptown, Yes you are thinking right,it sounds mad, but things are much different in Pakistan than USA,

First of all, You must try to understand the power shortage problem & available solar products/solutions in Pakistan
then you will be at a better position to suggest & guide us members from Pakistan.

I have learned a lot on this forum & will appreciate any sort of help from you,

Thanks.

[Naptown]

Irrigation system is deep well water

And how many gallons per minute do you need.
does this pump into storage? or into ditches, how is the water distributed?

[Mian Jee]

Irrigation system is deep well water

Shah Jee, Can you tell me the bore size & length of the tube well & type of pump you are using ?

[Naptown]

@ Naptown, Yes you are thinking right,it sounds mad, but things are much different in Pakistan than USA,

First of all, You must try to understand the power shortage problem & available solar products/solutions in Pakistan
then you will be at a better position to suggest & guide us members from Pakistan.

I have learned a lot on this forum & will appreciate any sort of help from you,

Thanks.

The process for designing a system is the same no matter where it is located
Step one identify daily load in Watt hours
Step 2 identify daily insolation.