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These RV Solar Mistakes Are Seriously Problematic

These RV Solar Mistakes Are Seriously Problematic

These RV Solar Mistakes are Seriously Problematic

Most RV enthusiasts think about adding solar power to their RVs at some point. Endless energy potential, quiet power, and no need for an RV park reservation…those are just a few reasons to upgrade your rig.

However, many travelers may not completely understand their systems. Panels, inverters, controllers, a battery bank; there are lots of moving parts!

Today we’re providing some clarity on the RV solar issue. This article should help you avoid making 5 surprisingly common RV solar power mistakes.

RV Solar Panels | Tax Deduction Potential

Why Use Solar Power with my RV? 

Now, there’s the $64,000 question! 

Why is the idea of solar power so popular among RVers? 

It must have something to do with shrinking your carbon footprint by using “free” energy.  Or maybe it’s the fact that it is considered “clean energy” that makes it appealing.  I’m sure many also consider adding solar power as a way to increase off-grid capabilities.

Whatever the reason, a solar setup can be a major component in your energy arsenal.  Just be sure you educate yourself on how the system is designed and functions.

5 Common RV Solar Power Mistakes

Before you decide upon your RV solar power system, give the common mistakes a look. Learning these may save you a lot of time and money.

Not Understanding RV Solar Power Limits

Make sure you realize your solar system’s limitations.

Environmental limitations might include limited charging capabilities on cloudy days. Dirty panels can also hinder energy absorption.

You will also need to become familiar with how much energy your rig is using. Realize that larger draws on the system, like running an air conditioner or microwave, must usually be mitigated by not running something else at the same time. 

And in many cases, you may not be able to run an air conditioner at all.

However, with this mod, ACs run with ease

If you learn the wattage requirements of your RV’s appliances, large and small, you will be well on your way to understanding just what your solar setup can and cannot power.

Not Having A Powerful Enough System

Many times RVers add solar panels to their rig. You may also purchase an RV that already has a small solar system. In both cases, you may suddenly realize they don’t have the power they need. 

100 watts is not going to run your refrigerator, water heater, microwave, computers, etc. all at once. 

Do an inventory on how many watts you are actually using a day, then divide that number by 24 to come up with an average number of watts you use in one hour.  Then figure how many hours a day you get peak sunlight and multiply that number with the number of watts per hour. 

Your product can then be divided by the number of watts your solar panel is rated for.  That answer will tell you how many solar panels you should have.

Keystone Montana Super Solar Flex 5th Wheel RV

Over-Discharging Batteries

If you are using lead-acid or AGM batteries to collect your solar energy, you should be very careful in keeping their discharge rate above 50% or you may damage the batteries.  If this happens where you cannot gather power in any other fashion (like running your motorcoach engine to recharge the batteries or using a generator), then you must stop using power in the RV. 

At this point, you may want to consider upgrading to lithium batteries, which allow you to discharge almost 100% of the energy stored in them before requiring a charge, or having one or two back-up energy sources like the generator or plugging into shore power.

RV Lithium Battery System in 1979 Airstream Renovation
RV Lithium Battery System in 1979 Airstream Renovation

Not Using Fuses and Breakers Properly

When solar energy is added to the mix, there are several parts to the system that should have stop-gaps. This will help protect your appliances on the electrical line.  Three places in particular should have fuses to do that, and if they are not installed properly or are undersized, they will not be able to do the job correctly, leaving your solar system and your coach jeopardized. 

Make sure an inline fuse is placed between the solar panels and the charge controller, another one placed between the charge controller and the battery bank, and a third-placed between the battery bank and the inverter.

rv lithium battery

Using Lead Acid Batteries

Here’s why you don’t want to use lead-acid batteries for everyday solar applications:  Solar systems are collecting power and transferring it to your batteries every time the sun is out.  In other words, you are charging and depleting your batteries almost constantly. 

Because lead-acid batteries can only safely be discharged to 50% before they are damaged, you are using their limited “charge cycles” several times and shortening the battery’s life much quicker. 

Also, lead-acid batteries take much longer than other battery types to recharge. Power to your devices is not available as quickly if you are totally dependent upon solar for your energy needs.  Using lithium or even AGM batteries will give you quicker charge times and lower discharge rates and will require virtually no maintenance on your part.

Is Solar Power for You?

Adding a solar system to your camper’s equipment can be a large and expensive proposition, but one that will pay off in great dividends to your power needs. 

Just learn all of the system’s parameters and limitations, so that you can have a dependable, well working power generator for years to come.

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Monday 21st of February 2022

You keep talking about running my refer, A/C and water heater on solar power? All my devices also run on propane. Do you mean that I will still need solar power or some other source to run them? I think that they might need a small amount of electricity for controls? Tell us. Your articles are not very specific.

M Bruce Parker

Thursday 23rd of December 2021

I have yet to see any article about replacing lead acid batteries with lithium batteries, and any compatibility problems to consider.


Saturday 4th of December 2021

Thank-you so much Kyle. Very informative video and article about solar powering an RV. I’ve been very interested in solar and now have a better perspective on how to apply it in practical approach. Time to break out the spread sheets!

5 Best RV Solar Panel Brands - Drivin' & Vibin'

Saturday 4th of December 2021

[…] Pro Tip: Solar panels are a big investment, so make sure to avoid these RV Solar Mistakes That Are Seriously Problematic. […]

John Chevalier

Friday 30th of July 2021

You're going to read on the net just about everywhere that installing a solar power system on your RV is "easy". While this is basically true for installing the physical components of a solar power system, there is much more to doing the job correctly and safely than just finding a good place to mount an inverter and so on. Theres even more to it than figuring out your power needs toward which the article above provides a great mathematical formula. Some of the other parameters that you'll need figure out includes the size(or gauge) of wiring required for your application which can vary depending upon loads and distances the wires have to span etc.. Selecting a power controller is also not perfectly straight forward since there are countless brands and models to choose from and at least a couple different types. The more expensive controllers process power coming from the solar panels more efficiently. This can help ensure that your charging needs keep up with your usage demands. But not everyone needs an expensive, highly efficient controller. For example, I use a very inexpensive, $15 controller between a small 12 volt solar panel and a spare car battery. Basically, it's a trickle charger setup. On the other hand, in my RV solar power system, I use an expensive, efficient controller. Trickle charging a battery that I'm not drawing power from doesnt require high efficiency. Keeping a bank of batteries charged that I do consistantly draw power from does. At least to me. I could do the job with a less efficient controller but wouldnt want to. I'll also mention that there is a recommend solar panel wattage to battery bank storage ratio. The basic rule of thumb is that the total output of your solar panels in wattage should be twice that of your battery storage in Amp hours. For example, my RV system has 215amp hours of battery storage and uses two 200 watt solar panels to keep those batteries charged. So approx 200amp hours of storage to 400watts of solar panel.

Anyway, I'm just trying to point out that installing a solar power system into your RV is a doable DIY project but not by someone who doesnt want to do their research and thinks he can "wing it". If you're going to install a solar setup on your RV, do your research and a lot of it. You'll actually have more fun with the project if you have a good idea what you're doing anyway! Neither will you end up stuck somewhere out in the boonies because the undersized wiring you installed overheated and started an electrical fire which fried all the other wiring in your RV(or worse). Good luck!

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