Tesla Motors Club

I'm ordering one Powerwall to start with. My energy usage is borderline. One might suffice, but two would be better. But it's a lot of extra money and I might be ok with just one.

Does it complicate things to add another one later if necessary? I know it means getting the crew out again and whatever is associated with that. Do you have to get permits? Am I setting myself up for more pain down the line or is it not a big deal to add another later?

Thanks very much