Design a standalone (off grid) PV system for the households in the village so that the following electrical appliances can be utilized: • 1 x 18 W fluorescent lamp running for 4 hours per day • 1 x 60 W fan run for 2 hours per day • 1 x 75 W refrigerator that runs 24 hours per day with compressor that runs 12 hours and off 12 hours The system will be powered by 12 VDC, 110 W PV module. Description 1 Project aim 2 Project theoretical background 3 Project problem statement 4 Specifications (material to be used for the project) 5 Method used for communication 6 Challenges experienced 7 Number meetings attended 8 Meetings attendance list attached 9 Calculation of power consumption demand 10 Calculation of size of the PV panel/s (number of PV panels required)
Calculations of power consumption demand
(80W*4hours)+(60W*2hours)+(75W*12hours)
Total pv panel energy needed= 1340.0*1.3
=1742 wh/day
Calculations of size of pv panel
The total watt peak rating needed by the pv panel =
total number of pv panel needed=
actual number of pv panel=
Inverter sizing:
total watt of all appliances =
for safety inverter size should be= or higher
(25-30%) higher
battery sizing:
total appliances use=
Normal battery voltage =12V
battery capacity = Ah
So the battery should be rated 12V, 700Ah for three days autonomy
solar charge controller sizing:
solar photovoltaic module specification
Pm=100Wp
Vm=167Vdc
Im=6.6A
Bdc=20.7 V
Ix=7.5A
solar charge controller =( 4strings*7.5)*1.3
=39 Amp
Thus, the solar charge controller should be rated 40 Amp at 12V or greater.
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