I don't THINK it's quite that simple 'cuz shore power only supplies 115v AC power...Electric pumps intended for use aboard are all 12v, 24 or 32v DC (most boats have only 12v) requiring some kind of "converter" or buy a cheap car battery to power it.Peggie for power on the cart I would have just ran an extension cord
20 posts into trying unsuccessfully to find a way to empty your tank without your having to expend any energy, methinks the easiest solution would be: Just bite the bullet and accept the need to use the manual pump on the cart to empty your 80 gal holding tank, but do it when there's only about 20-25 gallons in it instead of waiting till it's full. If it already has a lot more than 20-25 gallons in it, just pump that much out each time. If you're living aboard alone, you should only have to do that about once every two weeks unless you're using a lot more water to flush the toilet than you need to.
--Peggie