MCP73831 lipo charger question

I have some of these on hand. I'd like to build a solar charger, and use these since I already have them. My thought was to get a 9 volt panel and regulate it with 7805. Have any of you done this before? All of the examples I see using the MCP73831 are for USB powered chargers, I wonder if there are implications with using a sometimes-on sometimes-off supply like a solar panel.

MCP73831 has a max supply voltage of 7volts.

Do you want to charge a single LiPo? Read this. Leo..