Honestly bud, if you are in the U.S. I really don't think you have anything to worry about. An extra $200-$300 a month on your electricity bill isn't going to raise any red flags. There are a TON of things that can be responsible for that type of load increase. It's up to you but if you are looking into off the grid methods and a simple NG/Propane 4-5kW generator would be my recommendation. I don't know too much about solar but the systems I've looked into would cost around $10-$15k to set something up to meet your needs if you count the batteries, cells, inverter, installation, etc... You could probably get the generator for around $1500 and you'd have to change propane tanks every 10-14 days so the cost of the tank would have to be factored into your monthly bills.