Solar System Designing

8/13/2019 Solar System Designing

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No. of Fans = 4 Wattage of one fan= 100 watt

Total fan wattage = 400 watt

No. of lights=4 Wattage of one fan= 25 watt Total lights wattage= 100 watt

Total wattage= fan + lights= 400+100= 500 watt

Load Calculation


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We will calculate daily watt-hour usage of each

appliance.

This is done by multiplying each appliance wattage by no. of hours usedeach day

For example if we use each appliance 4 hours daily, then watt hourcalculation is done by following way:

Total wattage = 500 watt

No. of hours used each day = 4Watt hour = 500 * 4

= 2000 watt-hours.

Watt-Hour Calculation


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For batter battery usage, we should rely on 80 % capacity

of the battery.

We can also assume that battery efficiency is about 80 %

So, dividing total watt-hours by battery efficiency , we

will get

Total Battery capacity = Total watt hour / batteryefficiency

Total Battery Capacity


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Total Battery Capacity = 2000 / 0.8

= 2500 watt-hour

Cont.


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Batteries are rated in ampere-hours(Ah).

Battery bank voltages are 2, 4, 6 ,12 volts

If we want a battery bank of 48volts , we will connect 4batteries of 12 volts in series i-e

12x4 = 48 V

Size of battery bank can be calculated by dividing totalbattery capacity to battery bank voltage.

Size of Battery Bank(Ah)


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Size of battery ( Ah) = Total battery capacity/

Battery bank voltage

= 2500 watt-hour / 12 V

= 209 Ah

Cont.


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To arrange 209 Ah battery is somehow difficult so we use series

of batteries to meet 209 ampere rating.

For example if we are using 45Ah battery of 12 V then totalnumber of batteries required are given by following formula:

No. of Batteries = Size of Battery(Ah) / 45 Ah.= 209 Ah / 45 Ah.

~ 4.6 or 5

These batteries are connected in parallel to increase current (Ah).When batteries are connected in series , voltage(V) is increased.

No. Of Batteries Required


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For Example we are using solar panels each having 60

watt power . So how much solar panels are required tomeet our requirements .

No. of solar panels required is calculated by dividingdaily watt-hours with solar panel wattage times averagesunshine.

Let us assume that average sunshine is 6 hours.

No. Of Solar Panels

Required


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So,

No. of Panels = 2000 / ( 60 x 6 )

~ 5.5 = 6 panels

Cont.


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Solar System Designing

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