# Answer to Question #233263 in Mechanical Engineering for Molahlegi

Question #233263

Design a standalone (off grid) Photovoltaic (PV) system with special reference to the village in South Africa with the following PV panel generation factor of 7

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2021-09-06T00:54:03-0400

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=

(25-30%) higher

battery sizing:

total appliances use=

Normal battery voltage =12V

battery capacity =

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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