Building a solar generator

Guest Post by Bill Brooks

As many of you know, I recently completed my tiny house on a trailer. I plan to travel to a few locations beginning this winter. I built my tiny house to be self contained, since most of my time will be spent in places without services (electricity, water, etc.). Since batteries will supply the house’s electrical power, I will need to recharge them often. While I will have a propane generator, I plan to use solar power for most of my needs. This should allow me to get power, and keep the costs down by not buying propane as often as if I was using the generator.

Completed Solar Cart

Often, trailers have the solar panels mounted on the roofs. This allows the panels to charge the batteries as long as there is sunlight available. The problem with this set up is you need to park your trailer in the sunlight. While this might work well in some locations, others will have trees and other obstacles that can block the sunlight. Also, certain locations might result in parking the trailer facing away from the sun, hence lowering the output of the solar panels.

Originally, I decided to place the solar panels on a cart. This would allow me to move the panels into the sun, reposition them as needed, and provide storage for the panels. As a further enhancement, I added a solar controller, battery, and inverter to the cart and turned it into a solar generator. That way I could have power available in almost any location I plan to go. With this set up, I can use both AC and DC items, such as a microwave, and even a refrigerator all powered by the sun.

The Solar Generator Parts

First, the technical details for those who are interested. The solar generator (which I call the SolGen 160) has a four major components. The 2 solar panels are rated at 80 watts each, for a total 160 watts. The solar charge controller is rated at 30 amps. The battery is a marine deep cycle model, and is rated at 210 amp hours. The inverter is provides a steady output up to 1100 watts of AC power, with a peak output of 2200 watts.

Ok, so what does all that mean. Based on the manufacture’s solar panel ratings under ideal conditions, the SolGen 160 should provide approximately 460 amps of power each week to charge a 12 volt battery. While you never want to discharge a battery completely, the output is enough to fully recharge the battery in 3 to 4 days. If you use only 25% of the battery each day, the solar generator should be able to fully charge it up during the next day. With this set up, it can power a number of appliances, such as a small microwave, TV, laptop, or even some power tools. All the comforts of home can be available wherever the cart is located, in a campground, a forest, or even the desert.

How was the cart assembled

I used 2×3 lumber as the framing for the cart, and enclosed it with the T-1 siding. The overall size of the cart is approximately 4 feet wide by 4 feet long by 4.5 feet tall. I began by building a wooden frame that fit around each panel. I then built two L-shaped pieces for each panel to hold the panels at a 45 degree angel. The L-frames were cross braced to provide a solid base for each panel. Then the two panels were attached together by screwing the frames together. Next I added the T-1 siding to enclose the cart, and a piece of plywood to form the cart floor. After that, I built doors on the back to allow access to the battery and components inside the cart. Finally, the cart was painted and caulked to prevent leaks, and wheels added to make it mobile.

Here is a video slideshow of the building process…(video created by Steven at Tiny House Listings


Cost of Materials

The SolGen 160 cost approximately $1500 to build. The cost breakdown is as follows:

Solar Panels – $ 850
Battery+box – $ 180
Solar controller – $ 100
Power Inverter – $ 70
Subtotal – $ 1200

Cart – $ 300
Total – $ 1500

The major portion of the cart expense was for the T-1 siding and the 2×3 lumber. The wheels, hardware and paint were a small additional cost, and purchased locally. While they lumber was purchased locally, the solar panels, controller, and inverter were all purchased from While this configuration was designed to fit my needs, buying fewer or less expensive solar panels and components would reduce the cost of the cart.

Several people have expressed interest in the SolGen 160 since I posted it on Twitter and Facebook. I am considering selling a set of plans so people can build their own solar generators. If there is any interest in this, please let me know by responding to the poll below. Thank you!

Would you be interested in plans for a Solar Generator Cart?

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Installing the Mattress in Bill’s Tiny Solar House

Last week I gave you a tour of Bill Brook’s tiny solar house. He was inspired and has started a series of videos as he completes his home. This is Bill’s first attempt and I think he did an excellent job. Bill shows how he prepares his loft area for the mattress he plans on sleeping on in his tiny home and than installs it. I look forward to seeing many more videos from Bill. Thanks for Bill for sharing your knowledge and skills.

Bill Brooks Tiny Solar House Part 4

Tiny Solar House part 4 by Bill Brooks. This video covers his loft design and sleeping area. Bill also goes into some design issues he came across as he built his house. Some things he would change if he was to build it again. Thanks Bill for sharing your knowledge and your tiny house with us.

View Part 1 and Part 2 and Part 3 and also be sure and subscribe to the Youtube Tiny House Blog Channel here. You will than be notified of any new videos on this channel.

Bill Brooks Tiny Solar House Part 3

Tiny Solar House part 3 by Bill Brooks. This video covers his storage area and refrigerator as well as some of the electronics in the unit to convert the electricity to the different modes available.

Also a tour of the shower and bathroom area and an introduction to Bill’s composting toilet. Again lots of little details that you may not have thought of. I appreciate Bill being such a great tour guide of his work.

View Part 1 and Part 2 here and join the Youtube Tiny House Blog Channel here.

Bill Brooks Tiny Solar House Part 2

Here is part two of Bill Brooks tiny solar house. You can view part one here. I know I left you hanging in the last video as we were getting ready to step inside the house. It just seemed like a good place to break and than move on to the next stage.

In this video, Bill shows us the kitchen, his propane heater, water storage and some of the plumbing that was involved. There are lots of little details that go unnoticed because they are hidden and this helps give you an idea about the work involved.

Again, I am learning and the video is proof of that. I am getting a little faster at pulling them together so in the next post you will probably see 2 or 3 videos. Youtube limits the length so I am trying to give you over an hours worth of video in little sections so you can get the full picture.

To keep updated be sure and subscribe to the Youtube Tiny House Blog Channel.