Forgot about my Xantrex Freedom 458 2500 watt that I bought for the Prevost. Figuring all I need to do now is wire from the van battery to a continuous duty solenoid (powered after ignition) to two deep cycle batteries. Batteries to the Xantrex and Xantrex to receptacle box for the freezer to plug into.
Another question : In a pinch, would my 1000watt Honda generator be able to supply enough charge to the deep cycle batteries to power the Xantrex/freezer?
I think your bigger question is whether the Xantrex will "load share" what you have. If (as has been noted) you can really get about 750 watts dependably out of the little Honda, you'd need for the freezer to run on less than that. Probably what you'd see in "real life" is that every time the thermostat tripped on the freezer compressor, you want enough power for the "start up" surge, then you'd need to supply enough wattage to keep it running in steady state. What may (should??) happen is that the Xantrex would pull a little power out of the batteries to get over that momentary power need, then -- assuming that the generator is making more power than is needed for "steady state", then the extra power goes to charge the batteries.
Of course, the freezer won't pull any significant power (other than a trickle for maybe a thermostat or something like lights) when the freezer has dropped to it's Off state (i.e. the compressor on the freezer isn't running) -- during this time, the full output of the generator is going to charge up the batteries.
I am going to take a bare stab here -- it's on a guess -- but I'd guess that a "Honda 1000" would power anything that's less than 5 amps current draw at 120Volt. That would be 600 watts, you'd need the margin for efficiency losses in the inverter and that "extra power" for the battery charging after the inverter has needed to pull power from the batteries. And that would mean that the generator would need to run about all the time.
A more useful scenario would be for the batteries to power the inverter and the freezer. Then when the batteries are down to about a 50/55/60% state of charge, you'd start the generator and bring the batteries up to fully charged (actually 94-96% of the theoretical full charge for new, sharp, efficient batteries). Then you'd stop the generator and let the batteries carry the load until you repeated the cycle. You'd need calculations for this - you'd need to calculate the amp-hour capacity of the batteries (and probably convert that to wattage); adjust for inverter/switching/wiring inefficency, and that would give you hours of time that any given amount of batteries would cover the needs of the freezer, stated in watt-hours. Another guess -- you'd need more than "a couple" of deep cycle batteries (unless they're *very* big) to run a setup like this for more than just a few hours. Would you be able to fully charge at 8PM (wouldn't want to run a gennie much later than that if there are other people around) to carry you through until morning? As I guessed, you'd need a fair amount of battery capacity to do that.
(And remember Bare-Bones won't do it for you -- you'll always have to have a little reserve built into your system.)
These are just my opinions (and my guesses), but I hope they'll help you. BH NC USA