Something like that.

If you have power at your field, and you want to be able to fly every 20-30 minutes or so (I wish I could do that at my field!), I'd error on the side of getting a big enough power supply to run two SETS of chargers to simultaneously charge two SETS of batteries. I don't know for sure but I suspect that the Radio Shack power supply I'm using wouldn't be able to support that. I haven't a chance to do the math - but it sounds like Chad has, you might consider getting one of the 45-50 Amp power supplies he's posted URL's for (it's cheaper to buy a slightly bigger power supply than to buy two of the next size down).

What I'm wondering is if the 1000w Honda generator that Andrew had at the Nats could power two sets of chargers as described above? I don't have power at my field and that generator was WAY quiet! I guess I'll have to break out the calculator and run the numbers (an Aero E pretending to be a EE, now that's dangerous!).