How to build a model solar home?

Capacitor's would work but hard to regulate.

You could try going with the plain old rechargables.

Or build a dry cell from scratch.

If I were you find a buch of recharable as you can and use em'; cell's aren't that bad but you would need to find the right resources for your needs. Capacitors are just plain hard to keep controlled and regulated

Google it. I'll bet you could find just what you are looking for.