Computers in Your Camper

With COVID-19, there are a lot of people that have turned to camping for recreation. While some are content to use a tent, a fair number of people are purchasing recreational vehicles (RV) and heading off on road trips. My wife's brother just sold his house and bought a large camper trailer for just such a trip. My cousin is doing the same thing. I have sort of been bitten by the bug as well. I don't plan to convert a Mercedes  Sprinter van into a camper but I do love seeing what people have done to create their own tiny homes on wheels.

Yesterday I came across a person that built a very nice RV that seems to be a very comfortable home. I admired all of the thought they put into their build. Unfortunately they ended up doubling their budget for the camper but have something that would sell for 10 times what they paid. However while watching the video I noticed that they over engineered their electrical system and could have saved some significant money. Part of the problem is their mentality of how we use electricity at home vs. while camping and I hope to fix some misconceptions with this post.

A lot of the RVs being built are meant to be used off the grid. That means people want to pull into the forest somewhere and not have to connect to any water or electrical hookups. That is a noble goal and requires careful planning. Thinking of only electricity, this requires several solar panels on the roof combined with a large battery bank. The video I saw yesterday did an excellent job. Then things got expensive for no reason.

Electricity in our homes uses alternating current (AC). There are 2 reasons for this. The first is that it is a more efficient way to get electricity from the power station to your home. The second is that it is easier to fuse. While you can fuse direct current (DC) power systems, large voltages can jump across open circuits as that is what lightning does. We build appliances for our home to run using alternating current because that is what is available. Solar panels and batteries output DC and so one should spend a little time thinking about the losses converting DC to AC as there are some.

While our home appliances run on AC most of our home electronics such as televisions and computers actually run on DC. The power supply in your desktop computer converts the AC power into DC and delivers it to all of the components into your computer. If you look at the power brick associated with your laptop, it will tell you how much voltage AC it expects in and how much it delivers to your actual computer in DC voltage.

Jumping back to the video I watched, they had some massive Lithium-Ion batteries connected to a very expensive 3000 watt pure sine-wave inverter. The purpose of the inverter is to convert the 12 Volts from the batteries into 120 Volt AC power. The fact that it is a pure sine wave means that it closely matches the power supplied in your regular home power outlet. Advertisers for inverters like this say that it is better for sensitive electronics. The truth is that most of your computer power supplies are very robust and will easily convert a non-pure sine wave to the necessary DC voltage. What really needs pure sine wave power are things like electrical motors and refrigerators. Another thing to note is that the pure sine-wave inverter is only 90% efficient at optimum load. That means that the best case scenario is that you are wasting 10% of your electricity.

The thing that really disturbed me about the video is seeing that the inverter had several power strips plugged into it only to have every cord convert that AC power back to DC power. There is also power loss converting AC power to DC. It would be much better to run everything in the camper off of DC power and only use the inverter for things that really need AC power. Let's be honest, if you are building a camper you can find most of your appliances and electronic equipment that will run on DC power. Doing so would allow you to use a less expensive inverter and you could also downsize the number of Lithium-Ion batteries required.

So if you find yourself deciding to build your own camper van, pay attention to your electrical needs. There are a number of products that don't need AC power. You can find fans, lights, refrigerators, and many other electrical devices that run on DC power. If you do a bit of research, you can even figure out how to power your laptop and monitors using DC power. This will save you money in the long run and give you more power given your battery and solar charging capacity.

Night Rock Climbing

My youngest daughter had her birthday a week ago and so my wife joined me in the Uinta Mountains to spend time with her. This daughter is the director of climbing for a summer camp and spends her weekdays teaching Boy Scouts how to climb. On Friday nights they will do night climbs and last week's evening of fun happened to fall right on my daughter's birthday.

My daughter had explained night climbs before but I had no idea what a party the evenings turn out to be. My daughter's boss has a set of outdoor speakers that he sets up with the help of stored music on his smartphone. Then all of the boys show up headlamps ready to climb about 50 feet. When I first heard of the event, I thought there might be 10 or so boys. Nope, imagine the entire camp showing up. Throw in the loud music, bobbing headlamps, and excitement of 14 to 18 year old boys. The sight impressed me and seemed like a lot of fun.

Last week my wife and I really enjoyed our evening watching our daughter celebrate her birthday. Our daughter enjoyed herself as well. In a world where I imagine most teenage boys enjoy video games and technology, it pleased me to see such a large group outside having good clean fun.

Two Weeks Backpacking

My sons and I just completed a 2-week backpacking trip at Philmont Scout Ranch in New Mexico. It was one of those character-building experiences that I think every young man should have the opportunity to experience. Every day you hike to a new campsite where they have various programs in which you can participate. Some of our activities included shotgun shooting, touring a mine tunnel 500 feet into the side of a mountain, rock climbing, repelling, and various campfire programs.

The only technology we took on the trip was our mobile phones in case of an emergency. While most of the time, they would not work, we could climb to the top of a mountain and get a signal and call home. One of the other boys on the trip brought a Goal Zero solar panel to charge his camera and it worked very well. All he did was hang it off his backpack while hiking and at the end of the trail, he had a fully charged camera. My oldest son was also able to use it to charge his mobile phone after discovering he had an Internet signal at one of our camps. After a couple of hours of Internet surfing and reading e-mail, his phone was almost dead.

I have to admit that it was good to get away from technology for a while. The only downside was that I had over 600 personal e-mail messages and 350 work-related ones when I returned. It took me a long time to get through all of my mail. Now I need another 2 weeks off. I just don't want to have to deal with that much e-mail again.

Hiking Yosemite

My son and I spent a week hiking around Yosemite National Park with my Scouts in California. It was a great trip and I highly recommend visiting our country's national parks when you have the chance. While my son has been to Yellowstone, Zions, and the Grand Canyon, he had not been to Yosemite.

My Scout Troop in California managed to get 3 campsites at the Hodgdon Meadows camp site where we set up a base camp. Two of the sites were adjacent to each other while the third was a short distance away. It actually worked out very well. We then had a number of hikes planned with one for each day we were there.

I relied on some of the other adults to know the trails and how to get to them. That was a mistake. We spent one day hiking all over Tuolumne Meadows looking for the trail head to Elizabeth Lake. I got home from the trip and did a quick Internet search only to get turn-by-turn directions on where to go. Had I done this same search before getting to Yosemite, my feet would have thanked me for saving them from a couple of extra miles I put on them that day.

My advice to everyone now is to do a quick Internet search before heading to any new place. Don't wait until you get there, do it before you leave. After all, we didn't have any phone service except in Yosemite Valley and so trying to use my iPhone's browser while I was there wouldn't have worked for this hike.

Camping and Computers

This evening I am headed out on a family camping trip with a bunch of people from the neighborhood. I have done a lot of camping this summer and so I am wondering why I committed to spend yet another night away from my own bed, fighting bugs, and smelling like campfire smoke.

For those that don't know, I am a scoutmaster for the Boy Scouts of America and had the opportunity to go camping at least twice a month for the past year and a half. Normally the scouts go camping once each month but I have also been an assistant advisor to another scout group that went to Philmont Scout Ranch back in July. To help us prepare for our 85-mile adventure, we had additional backpacking trips each month.

All this time outdoors has given me some insight into camping and computers. In all honesty they really don't mix. The whole point of camping is getting away from civilization and enjoying the great outdoors. When I go camping for just one night, I generally leave the computer home. Nothing says "nerd" like hovering over a laptop while everyone else is roasting marshmallows.

There is one exception for bringing a laptop camping: playing DVD movies. At the beginning of August I attended my troop's week-long summer camp and we had one night with no camp-scheduled activities. We decided to watch a movie. I brought up my laptop, a dozen PG or G-rated movies, external speakers, a projector, and my super-quiet Honda generator. The boys then had a great time watching "Strange Brew." I had to preface the movie with a quick "beer drinking" disclaimer but everyone was greatly entertained. We even had a healthy number of the camp staff join us.

While it is fun to get away from civilization when you go camping, it is also fun to bring some selected bits of it with you. Projecting movies onto a sheet strung between two trees is amazingly soothing. Combine that with a canopy of stars and it is easy to see why drive-in movie theaters were so popular. Now if I can do something to guarantee it won't rain tonight, I will be a happy camper.