I am considering getting panels from Solar City fairly soon. I am trying to decide the benefits of getting a large system and a Powerwall to cover the costs of switch from oil heat to an electric boiler(also eventually a Model 3). I live in Pennsylvania and spend roughly $2500 per winter on oil heat. The electric boiler that I am looking at for a house my size is roughly $1800. Pennsylvania has a net metering policy so any excess power generated provides me with a check at the end of the year. Any help on what information I need or calculations I should run would be most helpful.