Thank you for the info, I must apologize - I shouldn't write about this stuff late in the night.
First, I meant to say AC for the mains power, of course.
With the batteries, yeah, that could work as well, being 2 parallel banks. Only, parallel hardwired batteries can be a problem on charging.
The thing is, here in Germany people usually dont build solar panels for self supply. Because of some weird regulations here, that would be silly to do. If you feed power into the main power grid, you get about 40 cent per kw/h from the electricity company - if you draw a kw/h from the mains, it only costs 25 cent.
Because of that, people feed all power they produce into the mains, and what they need in their house they draw from the mains again.
So nobody (well, almost nobody) bothers to install batteries, since thats expensive and you'd hardly ever need them.
The solar panels are usualy wired to output higher voltages, 240V or even 480V. Then there are synchroniser units which turn that into AC and feed it into the mains. And - most important - count how much you have been feeding in, so you can get payed for it.
RE: D.I.Y. SOLAR POWER SYSTEM BY @davethediyguy BEING ENERGY INDEPENDENT Part 2