AN wrote:NSR, do you mean

[no_such_reality]

[quote=AN]NSR, do you mean inverter instead of converter?[/quote]

Yes, the transformer inverter, although I think transformerless inverters are now available.

There’s a boatload of sizes, but a few sizes at any technology level, if you’re following what I’m saying.

So we have a SunnyBoy Inverter.

This is the SunnyBoy – 5000 (5kW)
http://www.wholesalesolar.com/products.folder/inverter-folder/SB5000US.html

This is the SunnyBoy – 8000 (8kW)
http://www.wholesalesolar.com/products.folder/inverter-folder/SB8000US.html

The cost looks like wholesale is about $600. Not including install (the same), or those add-ins (the same).

So if you’re looking at $25K for a total system, adding $600 for a larger inverter and a few more panels won’t bump you that much. Probably an additional $2-$3K for 2-3kW more panels.