I have added Generator:Photovoltaic, ElectricLoadCenter:Generators,ElectricLoadCenter:Inverter:Simple, ElectricLoadCenter:Storage:Battery and ElectricLoadCenter:Distribution. Since it is an off-grid building, I was surprised that the HTML report in results showed that there is "Electricity coming from utility" and "Surplus Electricity going to utility". What can I do to define that it is not grid-connected?