What kind of Grid-Tie inverter should I use on a double-wide(mobile) home?

I heard of them just being plugged into an AC socket and everything is OK, but I also heard that there can be no other loads going to it, I don't know what that means. Does that mean anything in the house plugged up to AC plugs or does it just mean that one AC outlet where I plug the inverter up to? Or... show more I heard of them just being plugged into an AC socket and everything is OK, but I also heard that there can be no other loads going to it, I don't know what that means.

Does that mean anything in the house plugged up to AC plugs or
does it just mean that one AC outlet where I plug the inverter up to?

Or is there some other meaning to what it they are talking about?

This is the one I'd like to buy, but I need more information on any possible dangers:
http://www.amazon.com/gp/product/B005N2W...

Also, with this 300 watt inverter, do my solar panels have to be 300 watts or is that the limit and I can use everything below 300 watts, (for now I only have a 100 watt solar panel)?
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