BurbMan wrote:
Don't just buy an inverter using round numbers....add up the wattage of what you want to power, and buy one that will do the job. Remember that the bigger the inverter, the more you can run, and the faster it will suck your batteries dry.
I got a 150w pure sine inverter and installed it with this 15a auto transfer switch.
Here's the post on my inverter install.
I've since upgraded the converter/charger to a Progressive Dynamics with charge wizard, so I can restore the batteries with only a brief runtime when we are boondocking.
It's also a good idea to install a voltage meter if you don'y have one...I use it along with this chart to monitor battery charge:

According to my calculations I'd be using around 155w.
LCD TV: 120w
Receiver: 10w
SWM Power Adapter: 25w
I'll likely go with a 300w inverter now that I've done my calculations.
Thanks,
JL