Inverter pure or modified 400w or ?

So Monty has now a 100w solar panel and the standard leisure battery, think it 85/90amp.

Looking at charging/using off grid my Macbook and Lg 19" tv. Is 400w ample?
Take it pure sine is same as mains electric.
I don't want to damage my electronics.

Any advice GREATLY welcomed

Thanks

Paul
http://www.montythemotorhome.com