A Review of the Classic Roadtrek Electrical System

We get a lot of questions from readers about the electrical system in their Roadtrek. We always are happy to respond and answer what we can. In 2012 and 2013 I wrote a series of articles that explain the electrical system in our - and in what I would call a "classic" Roadtrek. Classic meaning a basic system that does not include the new electric options that Roadtrek has introduced since my 2011, starting in about 2013/14. This means no solar panels, no lithium EcoTrek batteries, no VoltStart, and no Engine Generator. This does include coach battery or batteries, shore power plug in, an Onan built in generator, an isolater or separator, an engine battery, and a three in one inverter, converter, charger or two units - inverter and converter/charger.

I will start with a very important tool in understanding the electrical system in these "classic" Roadtrek electrical systems - a computer simulation of the electric system. To use you must specify a year and model in the drop down menu that is at the bottom of the left column on the page. Select 2010 for years 2010, 2011, and 2012 - and possibly 2013. If you have a basic electric system in your Roadtrek beyond those years select 2010 also. IN ADDITION, there is a link at the top of the Simulator page for NOTES.  This will open a PDF file that gives a great deal of explanation. I did not create the simulator nor write the "Notes". I was sent this link by Roadtrek back in 2011 and the author of the simulator has updated the Notes since.

ROADTREK ELECTRIC SIMULATOR

Next, some history as I know it. Originally the electric system used a converter/charger unit and in some (and not in some at all) an inverter unit. The converter/charger charges your batteries and takes 110 volt power and converts it into 12 volt DC power. The inverter takes 12 volt DC power and changes it into 110 volt AC power.

During the 2005 model year, Roadtrek began to change this. Instead of two separate units, they started to install a three in one single unit that provided all three functions - inverter/converter/charger. By 2006 the changeover was complete. If you own a 2005 Roadtrek you may or may not have the single unit - you may have the two separate units.If you have a model year before 2005 you have the two separate units. If you have a 2006 you have the single unit. The single unit installed in 190s, 170s, and 210s is the TrippLite 750. In the Sprinter models, there is also a TrippLite but a more powerful unit - greater in wattage than 750 watts. With the larger unit you can run the microwave oven on your inverter. With the TrippLite 750 you cannot.

At the end of 2010, Roadtrek made another change. They stopped using wet cell deep cycle coach batteries and started using AGM deep cycle coach batteries. The change over is complete with the 2011 Roadtrek model year.  I know many with 2010's that got deep cycle wet cell coach batteries, but some have told me that their 2010 came with AGMs - likely late in the model year.  If you have a 190 and have two coach batteries. With the AGMs these are two 6 volt coach batteries wired in series.

I am not going to go completely though each component in the electrical system again, as the articles from 2012 cover these fairly well - and those articles, I have been told, have helped many. I am going to link those articles here so that it is all in one place. Start with the first introductory article and then read the rest from there. Here are the LINKS -

THE ELECTRIC SYSTEM - Intro

BATTERIES

THE GENERATOR

SHORE POWER

THE INVERTER

LOCATING THE INVERTER

CHARGING THE ROADTREK BATTERIES

IMPORTANT TO KNOW ABOUT THE INVERTER

LOW COACH BATTERIES AND THE GENERATOR

GETTING AN ACCURATE READING OF THE BATTERY VOLTAGE

THE BEST WAY TO KNOW YOUR BATTERY'S VOLTAGE 

PLUGGING INTO AN OUTLET THAT IS NOT 30 AMPS

To give you some brief information not covered in the above, your Roadtrek has either a Battery Isolater OR a Battery Separator. Each provides the same function BUT each works a differently to do this from the other. If you have a Roadtrek before 2006 (or 2005 IF your 2005 has the three in one inverter/converter/charger) you have a BATTERY ISOLATER. If you have a Roadtrek after 2005, you have a BATTERY SEPARATOR (specifically, a Sure Power 1315-200 Bidirectional 12 volt 200 amp battery separator. Either should be located in your engine compartment on the rear wall just about in front of the steering wheel. What these do is keep your engine battery and your coach battery(ies) apart and stop one from draining the other. The engine battery and the coach batteries are linked between these units BECAUSE while you are driving your engine battery will charge your coach battery - and similarly, when plugged into shore power or running your generator, your coach batteries will charge your engine batteries. (There may be some exceptions - see the simulator as this will show you exactly what happens when the engine is running OR the engine is off and you are plugged into shore power or running your generator- specifically for your year and model).  The change from a Battery Isolater to a Battery Separator came because of the TrippLite three in one unit which did not work correctly with a battery isolater. Be aware that the Isolater or Separator do not last forever. They can go bad over time. I have been told that when odd things start happening with your batteries and electrical system the first thing to do is have the isolater or separator checked. It can be tested to see that it is working properly. Now - just a personal observation. This past year I was not certain that the battery separator in my Roadtrek was functioning properly. I have since determined that it does. When I was unsure I set out to find the Sure Power 1315-200 Bidirectional 12 volt 200 amp battery separator to replace it. I assumed - never assume - that it was a common part. It is NOT. I contacted a few local RV dealerships (not Roadtrek) and they did not stock this - some had never heard of this particular model. I did locate it on the Internet at just a few RV parts retailers - in the middle and on the other side of the country. It is not a matter if it goes bad you can get a new one right away. You will wait to have it shipped to you or whoever is going to replace it for you. Interestingly, I have discovered the same thing about AGM 6 volt deep cycle batteries - 12 volt are easy to find - 6 volt are not.

Here are three links to help with the Sure Power 1315-200 Bidirectional 12 volt 200 amp battery separator -

LINK 1

LINK 2

LINK 3

Take your time reading the different articles referenced and linked in this article. Read them more than once. It takes some time to put all of this together and understand how this or that works - or even just what it is and does. 

So there you have it. I am still happy to help and answer your specific questions. It is best to use the Email Us link that is located in the column to the right on this page and email us directly rather than putting a comment on this article. It is much easier to interact with you this way and get the specifics. When you email, please remember to include the year and model Roadtrek that you have (or any RV - we get lots of questions on basics from non-Roadtrek or even Class B owners).