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Off Grid Solar System:
Invees-Admin August 2, 2021 Blog 120

Off Grid Solar System:

Typical Schematic:

Equipment Required:
1.Solar Panel
2.Inverter
3.Battery
4.Accessories (Not all mandatory)
a.Solar structure
b.Solar connector for end termination at solar Panel
c.Cable between solar panel and inverter, input and output of inverter
d.Battery cable
e.Isolator/switch for solar panel maintenance
f.Isolator/switch for battery maintenance
g.MCB output of inverter and Input of Inverter for inverter maintenance
h.Changeover/bypass inverter.
i.DB box for mounting accessories

Typical Schematic (with all accessories):

Accessories are not mandatory to run the system but recommended, for easy operation and maintenance.  

Calculate Your Inverter, Battery, Solar Panel, and Space on Terrace

Typical Bangalore (BLR) home example with solar water heater:

 

SL No

Description

Qty

Unit

Connected Load (W)

Day Run Hr

Night Run Hr

Day Energy

Night Energy

Remarks

1

1.5Tr Inverter Split AC

1

No

1500

6

8

3.5

5

BLR Ambient

2

Refrigerator 325 – 400L

1

No

350

11

13

1.54

1.82

 

3

Microwave

1

No

2000

0.2

0.2

0.4

0.4

20 minutes/day

4

TV 50-55 “

1

No

150

4

4

0.6

0.6

 

5

6- 8 kg Washing Machine

1

No

350

2

 

0.7

0

 

6

Water Pump

1

No

1000

1

 

1

0

 

7

Light

20

Nos

300

 

8

0

1

Average

8

Fan

6

Nos

360

12

12

1

1

Average

9

Other Kitchen load (Mixer, Water filter etc)

1

Lot

400

0.1

0.1

0.04

0.04

Average

10

Laptop / Mobile / Tablet

1

Lot

100

8

6

0.8

0.6

Average

 

 

 

 

6310

 

 

9.38

10.46

 

 

 

 

 

 

 

 

 

 

 

 

80% diversity

 

 

5kW

 

 

 

 

 

 

Energy required full Day with AC

 

 

 

 

 

 

20 kWH

 

 

Energy required night

 

 

 

 

 

 

10.46kWH

 

 

Battery Required (80% DOD)

 

 

 

 

 

 

13 kWH

 

Inverter required: 5 kW
Battery required: 13 kWH
Solar panel required: 5 kW to generate 20kWH /day (4 kWH / day as per OEM recommendation)
Space required: 200 Sqft (for solar Panel)  

Energy bill calculation:
Per day consumption: 20kWH
Per month consumption: 600kWH
For 600kWH electric bill shall be (including demand charges): Rs 5200
Considering AC will run for 4 months in a year, Electric Bill for those 4 months shall be: Rs.20,800.00
Balance 8 months electric bill shall be: Rs 24,000.00
Total electric bill for one year shall be: Rs 43,800.00

Advantages of Off Gird System
1.Green Power
2.Zero carbon emission for the power Generation
3.Zero GWP (Global Warming Potential) for the Power generation
4.Pollution Free Energy
5.Reliable Power without Interruption and constant Voltage
6.Safely usage of Equipment without any Surge and no need of Stabilizer
7.Low maintenance (If Lithium battery is used)
8.No electric bill (or minimal electric bill as no consumption)

Disadvantages of Off Gird System
1.Initial investment is high
2.Weather dependent. Less power in Cloudy days
3.Fairly large space Required for Solar Panel.
4.High maintenance for lead acid battery
5.High cost for battery replacement, every 3-5 years (for lead acid battery)
If You chose ‘Lithium Ion’ battery, then point no. 4 and 5 can be taken care.

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