Newbie - 1.2KW System design for India

[green_regards]

Wiring - Rs 2300/- ( This is quite low as well. The wiring between the panel and inverter is usually done using a 16qmm single core cable. For 1m it costs around 1500/- or so. So, you are talking about nothing less than 10m )

I meant 10 metres of wire.

[pragathe2]

Costing

First off, thanks for the awesome information posted all over this forum.

I'm trying to size and arrive a cost for a 1.2Kw system for my apartment, for the cost part I would specially appreciate existing Indian users to come forward and help me.

Here we go:
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Determine the load in energy for a 24-hour period. Not the watts, but the watt-hours:

Device- W- Nos- Hrs/Day- WH/Day
CFL- 13- 4- 5- 260
Fan- 43- 3- 18- 2322
TV- 165-2- 4- 1320
Total: 3902 Watt/hr/daily

Total load at any given time: 511 watts (devices X w X Nos)
Determine the size of the solar array to be used: 3902X1.5 = 5853whr
DETERMINE SOLAR INSOLATION IN HOURS: 4.67kWh/m2/day
DETERMINE THE SIZE OF THE SOLAR PANEL ARRAY: 5853/4.67 = 1253 watts

DETERMINE BATTERY SIZE:
1 day backup and 50% discharge cycle: 3902 *2 = 7804 watts
Using 48v batteries: 7804/48 = 163Ah

DETERMINE CHARGE CONTROLLER SIZE IN AMPS: 1253/48 = 26Amp MPPT
Pure Since wave Inverter = Upper ceiling of Total load at a given time = ceiling of 511w = 600/650VA
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Now for the queries:

1. I've taken only a 1 day backup time for the batteries since I stay in a Metro area and I do not have power cuts more than 2-3 hr. So 1 day backup should cover me for the power cuts as well let me use the energy at night time. Hope this assumption is correct.

2. I think finding a 165Ah/48v battery is difficult, I can see more of 24v and 12v around. I would be more happy with a single 165Ah/48v to maintain and that I have a space crunch. Any ideas ?

3. Is my calculation for Inverter correct ? or for that matter is there anything I missed our in the entire calculations ?

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Final BOQ for the system:

1. PV Panels 240w X 5
2. Charge Controller (48v / 30a / 1400w max) X 1
3. Sukam Shiny 650 VA Inverter (Pure Sinewave) X 1
4. Batteries 163AH/48V - FEI0-IN2000PLUS(200Ah/48v) X 1
5. Copper Wiring - As required.
6. Panel Mounting Stands - Any good local availability ?

1. 250Wp x 4 = 1000Wp = Rs.60K

2 & 3. Avoid separate charger and separate inverter. Go for solar hybrid MPPT inverter. 1500VA/1200W-48 Vdc will cost Rs.25K

4. Batteries: Exide IT500 150AH-12V x 4 numbers in series = Rs.60K

5 & 6. Rs.10K

Total = Rs.155K, add 20% for installers profit, final cost to you is Rs.185K.
I have done few such systems to my friends.

Why Avoid separate charger and separate inverter:
Both your inverter and solar charger will simultaneously charge the batteries which is not good. When sun is shining, you will still utilize power from grid(govt. supply), unless you manually switch off the grid supply to inverter.

[vbhoj74]

[QUOTE=green_regards;70158]

Rs 52.09/w I mentioned was for the entire system only with Rs 32/w for the panels.


Batteries 163AH/48V - Rs 12,000 . Well, a 12V, 180Ah battery costs Rs.12000 + VAT. Only one wont suffice. You will need to wire 4 such batteries in series, so you are looking at 4Nos X 12000 = 48,000/-. Please correct me if iam wrong.

I guess a 165Ah/48V single battery wont cost more than 15000/-.

@PMpragathe2: good point on the Hybrid MPPT inverter, any suggested models & suppliers ?

[pragathe2]

[QUOTE=vbhoj74;70505]

@PMpragathe2: good point on the Hybrid MPPT inverter, any suggested models & suppliers ?

You get 165AH-48V by connecting four numbers 165AH-12V batteries in series OR eight numbers 165AH-6V batteries in series OR 24 numbers 165AH-2V cells in series.
As far as I know, NO 48V battery is available.

Mod note - next time you try to sell on the site you will be gone.