Btw here's a cool website that explains a lot about inverters and even has a plug and chug calculator farther down the page if you know the watts you're using and battery specs. Tells you roughly how long the battery(s) will last.
http://www.donrowe.com/power-inverter-faq-a/258.htm
Last edited by Cecil Baird1; 09/30/15 10:39 PM.