I have a solar system w/ micro inverters (Enphase M215). As
@MrFixit stated, most microinverters are designed to be grid-tied, which means they don't function unless they're connected to the grid. If you want to charge exclusively from your panels, you will need to run a micro-grid to keep your panels producing power. But then you also need a way to sink the excess energy, so you would also want to get a battery back up to soak up any excess energy that's generated while it's off the grid. Otherwise, you'll need to throttle down the energy production to match the load (newer Enphase IQ series microinverters can do this.. my old M215's can only turn on/off, and it takes several minutes for them to turn back on each time, so it's not really practical in my case). But why would you want to throttle down your panels to match the load? That's just wasting solar energy that you could be generating.
A better approach is to just take advantage of being grid-tied. Let your panels generate as much power as possible, and feed the excess to the grid. If you wish, there are certain EVSEs that can tailor the energy draw to your solar output. So you could set the EVSE to charge your car only with whatever excess energy your panels are currently producing (basically, use the energy, instead of feeding it into the grid). This kind of setup is particularly good if you want to charge your car on purely solar power during the day.. say your solar panels are generating an excess of 3kW at a certain time.. the EVSE would automatically limit the charge to 3kW. However, there's a caveat.. J1772, the standard that the Clarity uses to talk to the EVSE, has a lower limit of 6A. So you can't set the EVSE to lower than 6A, so you can't tell the car to consume < 1440W @ 240V. An example of an EVSE that can self-adjust to solar output is OpenEVSE. However, it takes some expertise to set it up, and you have to have an external energy monitoring device to measure the net output of the solar, and feed that number to the EVSE.
I prefer to just let my solar panels run my electricity meter backwards during the day, and charge my car in the middle of the night. This has benefits for both the environment and my pocketbook. The panels feed power into the grid during the day, when electricity demand is higher,so the grid has more green power, and I am helping my utility to avoid firing up a dirty peaker plant to meet demand. By charging my car in the middle of the night, when demand is low, its high energy demand is less likely to contribute to making the utility fire up the peaker plant. Also, since I'm feeding the energy in during the day, when the cost/kWh is higher (off-peak and peak rates), and charging my car during super off peak rates, my energy cost is lower. Every utility has a different policy for electricity generation, so YMMV w/ the cost/kWh.
