What would be a good size power inverter to power a normal laptop in a personal vehicle?

I work on the road a lot and need to use my laptop to send paper work via E-mail from my personal vehicle. I was looking at an 80 watt continuous/200 watt peak power inverter from Harbor Freight. Something small and least expensive. I don't know to much about power inverters and am looking for some good... show more I work on the road a lot and need to use my laptop to send paper work via E-mail from my personal vehicle. I was looking at an 80 watt continuous/200 watt peak power inverter from Harbor Freight. Something small and least expensive. I don't know to much about power inverters and am looking for some good solutions.
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