Travel trailer built in generator

If any of you are familiar with travel trailers and fifth wheels you’ll know that they rarely come with a built in generator. The exception is some of the toy haulers with built in fuel tanks for the toys. Here I’ll go over the process I went through to get a generator built in, including remote start (yay!). The built in generator is powerful enough to run the AC unit, can be started remotely and run in any weather, and does not need to be lugged around- a generator powerful enough to run the AC is usually quite heavy. The generator is an older Onan 2.8 Microlite that runs off gas (you can get a propane version). It came installed in my truck camper so I’d been using it for quite a few years. When it was time to sell the old camper it was better to sell the camper and genset separately because the camper was 28 years old and no one would pay that much extra for the genset.

The first question I asked myself when planning this out is why don’t many trailers come with built in generators? I came up with 3 reasons. First, the target market for trailers is quite price sensitive, it’s a lot of money to have one put in. Second is payload issues, many trailers have very little cargo capacity. But I think the most important reason is the fuel tank – the lack of. On a motorhome, the generator uses the main fuel tank (same one as the motor). There’s no fuel tank in a trailer. And there are a LOT of regulations about fuel tanks, for safety and emissions. For example the US EPA requires all built in fuel tanks to have an evaporative emission system – all modern cars have this. I’m pretty sure that’s another big expense. So that brings me to the first thing I had to figure out, and that was a fuel tank. I ended up not putting a permanent tank in at all. Read on to learn what I did… but if you own a small boat with an outboard motor I’ll let you guess.

The next concern to figure out was whether the front compartment was constructed to handle the weight. No where could I find the weight capacity of the storage bin published. So. I had to go with what others are doing in the same trailer. I found out what others with the same trailer are commonly putting in there, and that is 4 – 6 volt golf cart batteries. The most popular is the Trojan T105 battery and it weights 62 pounds, for a total of 248 pounds. I know the generator that I’m planning to put in is 113 pounds plus the two group 24 12V are 38 pounds each, for a total of 189 pounds. And just going over the construction of the front storage area, it really looks solid.

So on my fifth wheel the place for the generator is up front in the storage bin under the bunk where the batteries are. It has to fit under the landing gear drive, and high enough that the front panel of the generator can be opened. In the photo below below the first support is visible on the left next to the framing square. And then there’s the batteries – they cannot be in the same space as a generator for safety reasons. So that will be part of this project too.

Location for generator in front of fifth wheel. Note the batteries are not in a sealed box – not good. That’s how it was when I bought the trailer. The original battery box with vent only held one battery.
Another view of the front compartment. It looks a lot different now…

More details and pictures to show the progress to be inserted here.

Generator is installed!
The completed installation. The generator is inside an aluminum box, with air intake on the left side and exhaust out the bottom. The front compartment also had to be modified to allow enough fresh air intake. The battery box is wooden and sealed air tight, with the vent tube hooked up. The grey box in the back upper right is the transfer switch between the built in generator, a small external generator and the built in inverted.

PICS needed.

completed installation

Solidremote remote control

Remote plug in for other genset

transfer switch

fuel tank.

front storage farther back view

exhaust routing

pic installed in old camper

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