Inverter’s convert PV-generated or battery-stored DC electricity into AC electricity that can be used to power household appliances.

Types of Inverters

There is two main type of inverters available on the market.  Modified Sine Wave and Pure Sine Wave.  If you wish to power small household appliances like lights, TV,s and fans. Modified Sine Wave inverters are affordable and have high efficiency. They will provide you with power comparable (but not identical) to what you get from NEPA.

If you would like to run larger appliances like a fridge, freezer, AC or medical equipment you should buy a Pure Sine Wave inverter.  They are ideal for motor startups,  make little or no noise  and give power quality equivalent to what you get from NEPA, however, Pure Sine Wave inverter can cost twice as much as an equivalent Modified Sine Wave Inverter

Inverter Size

To choose the right inverter size for your needs, calculate the total wattage of all the electrical appliances you would like to run on the inverter.  This can be achieved by checking the power rating label found on each appliance and adding up the total wattage. You can find out the wattage of your appliances by checking the markings on them or by reading the user manuals.  If you wish to keep your total cost down,  it is advisable to run only your essential appliances on the inverter.  The following is an example:


EquipmentCommon Energy Consumption in Watts
Ceiling Fan50W
Desktop Computer85W
4 Energy Saving Bulbs60W


We recommend that you buy an inverter twice the size of your total energy requirements so that you have extra capacity and do not run the risk of overloading your inverter.