Assignment : How to Design a Solar Power System for home

KISSAN EDUCATION

www.kissanedu.com

Suppose,
Living District = Una, Himachal
 Inverter's Efficiency = 95%
Battery's Efficiency = 85%
Converter Efficiency = 92%
Take Loom Solar Panel
Inverter = Microtech
consider only night backup for battery

Solution:
Total Day time consumption = 22800 Wh
Total Night-Time Consumption = 17280 Wh
Total Energy Consumption =  40080 Wh

Since Size of Plant is very high, so we have to consider only the night backup plan for optimizing

Step 1 :
Size of Inverter = Total Wattage of Appliances = Wattage * quantity = 5440 watt = 6 KW inverter

Step 2 :
Size of Battery:

Output Energy of Battery = Input energy of Inverter =(output of inverter) / (efficiency of the inverter)
                                          = 17280 /0.95  = 18190 Wh                                     

Energy Storage of Battery =  Output Energy of Battery / DoD of Battery

                                           = 18190 / 0.80 = 22738 Wh

Note DoD of Lead-acid Battery = 50 %
Dod of Excide Battery = 80 %
Dod of Li-ion Battery = 90 %

Let us Consider System voltage be 96V

Actual Capacity of Battery needed (Ah) = 22738vah / 96v = 237 Ah


Step 3 :

MAR	5.67
APR	5.98
MAY	6.32
JUN	4.86
JUL	3.63
AUG	3.74
SEP	5.37

PEak Sunshine H0ur in Summer season in Una, Himachal is =  May to Sept  =  4.78 hr

Total Panel Wattage needed = 22738 Wh/ 4.78 h = 4768 Watt = 5000 Watt Panel

For Every Inverter, there is mentioned panel capacity, how much wattage of dc panel it can handle.

We need 6Kva inverter, this inverter should handle 5000watt of the panel. If you don't get 6kva inverter for dc panel handle 5000 watts. You need to increase the size of the inverter or choose such an inverter that can handle 5000 watts of dc panel side.

note: You can search into market and dealers etc for solar inverter

For Compatibility, we take 6 Kva inverter of microteck

Capacity	6 kW
Technology	Sine wave, Mppt
Power Load	1 Air conditioners, Home appliances such as Light, fan, TV, Laptop, refrigerator and water motor
Batteries required	8 Nos. (150 Ah)

Technical 

Technology	Sine wave
Solar panel current	46 amps
Solar panel voltage (voc)	160 V - 240 V
Charger technology	MPPT
Full Battery Recharge Time	10-12 Hrs

Vmp voltage =                                   120v - 210

Cleary This inverter can handle dc panel load 6000watt, but we need only 5000watt

Choose the size of Panel :

Clearly, 330 Watt has the least per watt rate RS 43.

we choose panel 270 watts.


Wattage =      330W
Vmp =            37.50v
Imp =              8.5 Amp
Voc =              44v
Isc =                 9.4amp

Clearly from inverter need open-circuit voltage from dc panel = 160v to 240 v

Current need  = 46 Amp

Dc panel voltage range show lie between this

Total number of panel needed = 5000/330 = 15 panel (extra panel)

Total panel connection in series = 200/37.50=  5

a total panel in parallel =

5000/5*37.50 = 26.66
26.66/8.5 = 3

Hence

Total Inverter size = 6Kw
Battery size, 96, 237Ah,  96v, 120Ah ( 2 battery in parallel)
Panell = 330 Watt (5*3)