Solar Power System
System has the ability to convert the light of the sun into electricity. The output of the system is DC power.
The system is reliable, safe, clean, very effective and available.
There are two system types: ON-GRID and OFF-GRID.
ON-GRID system is the system which actually connected to Grid. OFF-GRID system or stand alone is the system that apart from the grid.
The Components Of The System
PV MODULES – The part that convert the light in the DC power
INVERTER – The part that convert the DC power to AC power
STRUCTURE – The part that holds the solar panels
CABLES – Responsible for the transfer of electricity. There are DC cables and AC cables.
BREAKERS – For safety conditions. There are MCB, MCCB, and RCCB.
EARTH SYSTEM – To protect all system components.
Power and Units
The power is the ability or capacity to do something or act in particular way.
Electrical Power : the rate per unit time at which Electrical energy is transferred by an electric circuit.
The SI unit of power is the Watt
One Watt is defined as the current flow of one Ampere with voltage of one Volt.
Current : is a flow of electric charge. In electric circuits this charge is often carried by moving electrons in a wire.
Voltage : is the pressure from an electrical circuit’s power source that pushes charged electrons(current) through a conducting loop.
In the solar power system we use KWH as a unit of measurement, 1 kwh = 1000 Watt produced in 1 h.
Current- Voltage Curve
Isc= Short circuit current(max current when no resistance in the loop)
Imp= (max point of current that we can get)
Voc= Open Circuit Voltage (max Volt when no load)
Vmp= (maximum point of Volt that we can get)
In both cases power =0 Watt because Isc with o Volt on the axis Voc with o current on the axis.