Okay, now I'm just plain jealous! 4 kW of solar and a geothermal system too.
I'll be hunting for the geothermal thread when I get through here. Congratulations.
On a more serious front, we should all be so fortunate as to be able to afford {and allowed to connect} a renewable energy system to cover at least part of our energy consumption. The geothermal system is also a great long-term investment AFAIK. I am looking into how I can possibly pay for either a geothermal {preferred} or inverter technology {alternate plan} HVAC system at home.