It also represents the two types of electrical current now running thru the bus. DC is battery power that is recharged with solar, while AC is converted into DC from the batteries. It is now also coming in from shore power ( a campground supply, or house, or a generator) which is basically plugging into “the grid”. The big terror, and design headache was – how to integrate two separate circuits into one, with a switch, without spending $1,000 or more. This called for a $70 switch, instead of a $300 switch and a “kit” for RV’s. The switch prevents the shore power from “backfeeding” into a very expensive inverter and melting components.
One of the biggest components in the design of composting toilets(even redneck designs) is separation of urine from the “poop pot”. You must do this to eliminate moisture from the compost, and decrease and eliminate the smell associated with latrines. This weekend I built the second prototype for urine diversion. The first had several glued and over-layed strips of PVC, so I built a simpler design with two pieces – one that is inserted onto the frame of the toilet, and the other, a funnel that is inserted into the urine container. I have been pooping and pissing in it all week. It works great!!