No, normally a house wiring will have its voltage from 110 volts onwards depending on the state or country. But a solar panel collects energy from the sun and stores in a 12 volt battery. the inverter supplied along with the solar system converts this 12 volt power to that which is already at your home
Solar energy system can be done only the expericence people which require 12 volt house wiring. On having solar energy system we can save fuel, so our enviorment can saved in future. we can also install 12 volt sc dc motion sensor lights which will work as inverter. Hence fule cost can be saved by this system
You were told you needed 12 volt wiring in case you use the solar panels to charge batteries and draw on those batteries later. You can still hook up the batteries to the house using other devices without a total rewiring.