that's the housing for generator # 2. why would anyone need two geni's on a skoolie you may ask?? old #2 is a freebie that was given to me a few months back. It's a cast iron kohler 1,800 rpm generator. Most geni's spin at 3,600 rpm's, making twice as many exhause strokes, thus a lot more noise, and those faster spinning units wear out in a shorter period of time.
old number 2 is a 4kw 110volt unit, it has a built in cooling fan to allow the geni to be mounted in an enclosed cabinet. It's wonderful, electric start, very quiet, super heavy duty. I'll never wear it out in my lifetime. I use it when i need 110 volts, and my batteries are going dry.
The problem is that i NEED 220 volts to run the hot tub. When i run the jets on the hot tub and shore power is not convienent, I fire up the brand new noisy Geni # 1 which is mounted on the other side of the bus.
here's the link to the geni page on my website
for more info