Greetings! I'm in the thinking stages of setting up an off grid system and liked Will's video on the dual Eg4s. Would it be possible to buy one of those units and use it in the 120v configuration and then later add the second Eg4. I don't want to blow-up my credit card all at once. My concern is setting up the breaker panel. Can I expand the setup from the 120v to 240 without making major changes to the panel box? I'm hoping it's just a matter of adding the 2nd line into the breaker and then making appropriate changes to the inverters.