Hi folks, I have two breaker panels, both with 20A Reliance Controls manual transfer switches on them. These accept L14-20 NEMA plugs from generators. I've got them wired to critical circuits like the furnace, fridge, and freezer and less critical ones like our home entertainment. I recently acquired one of the great Yamaha EF2000is 2000 watt generators. It provides a much cleaner approximate sine wave for my electronics and also is insanely quiet and sips gas compared to the 4500 watt monster I have. I also have a couple deep cycle RV batteries and a decent 2000 watt inverter (3800 surge) that I keep charged so that I can power a few lights, laptop computers, etc overnight without running any generators or during short term outages where I don't drag the generator out. Here's my challenge...I'd love to be able to use my transfer switches with either the inverter or the Yamaha to power just a few circuits, but both of these output your standard three prong 5-15 connector. There is no off the shelf 5-15 to L14-20 adapter available (that I have found), so I've been looking to build my own. From everything I can see and have read, the L14-20 just provides two 120V sources with ground. This enables you to support 240V loads on your transfer switch (I have none wired that way, they are all 15A 120V circuits). If I'm careful with the loads, it seems to be I can make an adapter that would feed a single 5-15 120V line into a L14-20 connector. This way I can plug this in when I want to run in "quiet mode" off the batteries or Yamaha but retain the flexibility of hooking either transfer switch up to the big generator as well. This would be for occasional use during power outages or disasters only, so even if it isn't the "ideal" it sounds like it could work. The whole Sandy situation got me thinking and during a longer term outage I could probably power most of what I need on the far more efficient Yamaha if fuel is an issue. I could also lose one generator and be okay, or do maintenance on one without losing power. Any gotchas I should be aware of here? Or is this an incredibly bad idea?