on the macerating toilet:
We had a sea land macerating toilet on board the family sailboat. Our battery
system was charged by the onboard diesel into a ~400+ amp hr battery
bank so no comparison there...but i can say that our macerator ran for about 20 to 40 seconds each flush. So doing the math, even though it is a big draw, a typical dual group 27 battery
bank of say ~200 AH should be fine for a week's _macerating_ ...longer if there was a small charge from a solar panel
PS...another advantage of these toilets is that by design there is much less water use in the long run. It is not really necessary to clean the black tank as often as on a non-macerating set up. And since the particle size is now very small one can utilize a 3/4" garden style hose to the dump.