NOTE: New update to my question in Post #25 below I got a quote today from SolarCity to install solar panels on my house. Sounds like a pretty good deal. Here are some of the specifics: Estimated System Size DC 4.17 kW System Size AC 3.64 kW Estimated Annual Production 4,340 kWh I have a P85+. My house currently has 100 amp service from the street, and I use approx 500kwh per month @ $0.16/KwH. So if I have the above system installed, and I do not have a HPWC installed but rather a NEMA 14-50 cable to charge my car, how many amps (or MPH) can I expect to get to charge the MS during daylight hours? I don't drive many miles per day, let's say rated 40 miles per day (at most on average), so I'm sure whatever it is, I'll have enough power to recharge for the day's usage, but I'm more curious if I return home with a fairly discharged battery, what would my optimal daytime charging rate be? Would I get the full 40 amps from a NEMA 14-50 from the solar array? Or would I be tapping the local utility at that point? I'm just not sure how to calculate the output of the solar array with respect to MS charging. thanks.