Off grid solar system
A off grid system is used in remote areas where there is no access to eskom power or any ware where a client doesn’t want to make use of eskom power. This system uses batteries to store excess power that was generated during the day.
Bi-directional solar system
This system is similar to the off grid solar system, the only difference is that the inverter have the capability to use the eskom grid or a generator as backup to supply the load and/or charge the batteries in case there was overcast weather for a few days.
Grid tied solar system
Solar panels feed DC power into a grid tie inverter that converts the DC power to AC power and feed it into your house/business. Excess power generated can flow back into the grid, turning your meter backwards (this is only allowed in certain areas) This is the best and cheapest way to subsidise your daily power consumption with solar power. If there is a eskom power failure or the grid is switched off for maintenance, then your grid tied system will not work as it is connected to the grid.
Solar water pumping
DC water pumps gets connected to solar panels through a mppt (maximum power point tracker) controller. Once the panels is producing enough power, the pump will start pumping and it will stop pumping if there is not sufficient power from the solar panels. Pump inverters are used where there is an existing 3 phase pump and the client want it to work off solar. Solar panels is connected to the pump inverter which converts the DC power into 380 volt AC power and the pump is connected to the pump inverter. The pump inverter has a variable speed drive build in, so it will let the pump run at a certain speed, depending on the amount of power it receives from the solar panels.
Sizing of solar system