I currently have a duel fuel cooker, gas top, electric oven and grill, however as we are on stand alone solar power we would like to know if we can convert the grill and oven to LP gas?

You will need a new oven to be able to do this because the gas oven has a chamber under the oven for the burners and the broiling section. Also, an electric oven is insulated on the bottom and a gas one is not.