Everything You Need to Know About Installing Lithium Batteries in an RV (2023)

Table of Contents show

There are some simple truths about installing lithium batteries in an RV that get buried by complexities and misinformation. Some may find it beneficial to convert their RV to lithium, while others may not. Whether you’re thinking about making the switch or just want to know the truth, our discussion about installing lithium batteries will clear things up.

You’ll learn about the benefits lithium batteries offer, the best place to install lithium-ion RV batteries, and the other components you’ll need to complete the project. We’ll also show you how those with 30-amp RVs can make the conversion over to lithium batteries without frying their electrical system.

In our discussion, we’ll mention the various electrical measurements like amps, amp-hours, volts, and watts. If you need a quick review of this electric jargon, check out Camper Report’s explanation.

Everything You Need to Know About Installing Lithium Batteries in an RV (1)

10 Truths About Lithium Batteries in RVs

Before we start talking about the installation process, there are some simple truths we want to cover that prove lithium batteries are good for RVs. There’s a lot of information floating around and many different versions of lithium-ion batteries in the marketplace. Unfortunately, many people can’t talk about these batteries without broaching the subject of RV solar panel systems. So, let’s clear some things up:

  1. RV solar systems work best with lithium-ion batteries, but you can use lithium batteries without solar panels. Your RV generator, tow vehicle’s umbilical cord, or motorhome’s alternator can charge them just like the lead-acid batteries you currently use.
  1. The correct type of lithium battery uses lithium iron phosphate-oxide, not the ones with poisonous cobalt. The battery industry refers to them by their chemical abbreviation: LiFePO4.
  1. You can install lithium batteries for your house batteries, not your engine starting battery. Most RVs use the Group 27 battery size, but some will use Group 24, Group 29, or others. Your house batteries should be labeled. If not, check your owner’s manual, call your RV dealer or RV manufacturer.
  1. You can install lithium batteries on any RV that accepts house batteries. They use the same connections that lead-acid batteries have. In addition, LiFePO4 batteries for RVs have the exact dimensions as their lead-acid counterparts.
  1. The gelatinous substance lets you install lithium batteries sideways, upside-down, and inside your RV without ventilation. Lead-acid batteries contain water and must have ventilation to distribute harmful gasses.
  1. Once you install lithium batteries, you can use them in temperatures between -4° to 135° Fahrenheit (lead-acid caps off at 113°F). You can charge LiFePO4 batteries above freezing temperatures; they won’t accept a charge below 32°F.
  1. Lithium batteries are half the weight of lead-acid versions. Traditional RV house batteries have an average weight of 65 pounds. So if your RV has two 12-volt lead-acid batteries, you could increase your power capacity with four 12-volt lithium batteries without moving the scale.
  1. On the financial end, lithium batteries cost more at the point of sale, but they’re a better investment overall. The average lead-acid battery lasts around five years. LiFePO4 batteries can last decades. The COO of Battleborn Batteries, Sean Nichols stated “lithium-ion batteries are 30 cents cheaper per [recharge] cycle compared to lead-acid versions.”
  1. In most cases, installing lithium batteries is virtually “plug-and-play.” Many come with built-in battery management system (BMS) in the battery’s casing. In other words, under most conditions, they regulate themselves. However, we still recommend performing a visual check-in monthly.
  1. The general rule of thumb for lead-acid batteries is to charge them when they reach 50% of their energy capacity. Lithium-ion batteries can limbo lower. Some companies will label their batteries for a specific amp-hour rating, but have a bigger capacity, has a margin of error preventing complete power drainage.

What Size Lithium Battery Do I Need for my Travel Trailer?

You need to know some other simple truths to determine the lithium battery size you need for your travel trailer or motorhome. Most RVs on the road today use Group 27 batteries. Some of the Classic Era (1971-1989) or earlier may use Group 24, Group 29, or Group 31 versions. One of the few components to standardize in the RV industry by the late 20th century was the house battery.

Generally, RVers keep it easy by purchasing 100 amp-hour capacity batteries for two reasons:

  1. It makes calculating their total energy storage simple
  2. The battery industry makes more of them

Lithium-Ion batteries come in 12, 24, and 48-volt versions. You’ll find them with capacities between 50-500 Ah.

If you check your RV’s house battery bay, 50-amp RVs (ones with the 4-prong shoreline) have two 12-volt batteries. 30 amp travel trailers and motorhomes (3-prong electric cords) have two 6-volt batteries. Those with the higher amperage may feel they don’t have anything to worry about, but many 30-amp RVers may have concerns about installing lithium batteries.

Can 30-Amp RVs Use Lithium Batteries?

YES, 30-amp RVs can use lithium batteries. RV manufacturers install two 6-volt batteries as a precaution. If one goes bad, there’s another in place. From an electrical standpoint, installing a lithium battery rated at 12-volts is the same as two 6-volts.

Lithium-ion batteries are very hardy technology, so relying on one LiFePO4 battery is a safe bet. The best lithium-ion batteries have the BMS within the housing, acting as a monitor. If the battery becomes too cold or is too low on energy, the system will shut the battery down for safety.

How Do I Increase The Capacity of my RV Batteries?

Most RVers want to know how to increase the capacity of their RV batteries.

It’s been hard to find a campsite during the Remote Period of the Modern Era’s (2020- Present) RV boom. Dry camping has become a substitute for campgrounds and has its RV lifestyle advantages. Electric power can make long boondocking experiences more comfortable.

Installing lithium batteries in multiple sets increases your power needs for longer durations. To do this correctly, you must know how to connect the batteries in the proper configuration. There are two ways to do this: parallel or in a series. Using the wrong setup can damage the RV’s electric system to the point where you need to replace all required components.

Parallel Configuration

The positive and negative poles stay separated when installing lithium batteries in an RV in a parallel configuration. This means you connect positive to positive using the red battery cables and the black cables for the negatives. 30-amp RVs must use this configuration to maintain the 12-volt power level.

The advantage of a parallel setup is increasing the amp-hours. If each battery has 100 Ah and you have four LiFePO4 batteries, your RV now has a 400 Ah power capacity. Instead of existing with the bare minimum, you’ll have more power to use more electronic devices or camp longer without recharging.

Series Configuration

50-amp RVs that have high-powered electronics may find a series configuration beneficial when installing their lithium batteries. When you connect the positive pole to the negative pole and vice versa, you’re increasing the voltage output.

For example, if you have two 12-volt lithium batteries in a series configuration, you’ve increased the voltage to 24-volts. So, with the proper precautions, an electronic device that generally uses 30-amps at 12-volts could use 15-amps at 24-volts.

Bringing the amperage down on a high-amp device can save energy. If you want to do this, consult a professional electrician and the electronic device’s owner’s manual to determine if this benefit is possible on your RV. Generally, RVers use the parallel configuration because it’s lower risk.

How Many Lithium-Ion Batteries Do I Need for my RV?

To determine how many lithium-ion batteries you need for your RV, you have to think about your electrical needs. Every electronic device requires a certain amount of watts/amp-hours. Someone using a teardrop camper for the bare essentials may only need one 100Ah battery. A boondocking family hauling a 43-foot fifth-wheel who doesn’t want to count their watts may need eight so they don’t have to start up their generator.

To give you some perspective here’s a basic chart to help you start the conversation on finding the right amount of lithium-ion batteries you’ll need for your RV.

# 100Ah Batteries NeededElectrical NeedsRV Size
1Charge mobile devices, Coffee maker, LED lights, Radio, Small fan10-14 ft.
1Charge mobile devices, Charge tools, Fans, LED lights, Radio, Small cooking device, Small electric cooler10-14 ft.
2Charge mobile devices, Coffee maker, Cooking device, Electric stove, Fans, LED lights, Medical device, Medium electric cooler/small fridge, Radio15-20 ft.
2Charge mobile devices, Coffee maker, Cooking device, Electric stove, Fans, Large electric cooler/small fridge, LED lights, Medical device, Radio, Small TV21-30 ft.
2-4Charge/use mobile devices, Coffee maker, Cooking device, Electric stove, Large Fans, Large LED TV, LED lights, Medical device, Medium fridge, Radio31-40 ft.
4-8Air conditioning (400Ah+), Coffee maker, Cooking devices, Electric stove & oven, Large fridge, Large LED TVs, LED lights, Radio, Use mobile devices40+ ft.

Do I Need To Change My RV Converter for Lithium Batteries?

You don’t need to change your RV converter for lithium batteries if you have an RV built in the Modern Era. When Yet-Ming Chiang and his M.I.T. researchers discovered the LiFePO4 compound in 2004, it didn’t take long for the battery and adjacent industries to adapt their technologies to the new power storage advancement.

Current RV converters have some type of switch that adjusts the programing from a lead-acid to a lithium-ion modality. Some AC to DC converters have an automatic equalizer that makes sure multiple lead-acid batteries charge evenly. If the auto equalization function doesn’t disable, replace the converter before installing lithium batteries.

When replacing the converter, make sure you keep it at the same amp level as the previous one. For example, if your current RV converter is 55-amps, purchase a new 55-amp with a lithium battery setting.

Battery Cables

Everything You Need to Know About Installing Lithium Batteries in an RV (2)

If you’re connecting multiple lithium batteries, you’ll need the thick gauge red and black battery wires. These copper wires come in various sizes for different requirements. You’ll be using the cables to connect the batteries and other components.

The first way is to order spools of red and black cable, a hydraulic wire cutter, a hydraulic crimper tool, crimp ring terminals, and heat shrink tubes covering the connections. The tools and crimp rings do come in kits, but make sure they come in the correct gauge (AWG) you need.

A second option is to go to your local auto parts store and have them cut the wiring you need from their supply behind the counter. Of course, you’ll still need to crimp the rings on yourself, but a pair of pliers works just as well and some electrical tape covers the connections correctly.

It can save you some money, and you won’t have to worry about all that extra cable rattling around your storage bay. We do recommend having one or two extra cables cut for backup purposes. Also, get both red and black. You must differentiate the positive (red) and negative (black).

RV Inverter

For your RV uses AC power then you’ve probably used your gas generator when boondocking.

If you’re a resident of California, you may have heard about the California Generator Ban legislation that’s making news right now. If it passes, you won’t be allowed to use a portable gas generator or onboard RV generator in the state starting in 2028.

RV converters change the AC coming from your shore power cord and convert it into DC power. The DC power goes into your RV’s house batteries and operates your DC electronics. These items include your slide-outs, interior lights, power awning, and more.

Conversely, an RV inverter changes the DC power from the house batteries to AC electric for many of your needed amenities and creature comfort devices. This includes your air conditioners, TVs, appliances, water pump, and many other features.

When you add up all of the watts of the electronic devices you need, choose the RV inverter that’s the next level up. Having that “cushion” of extra wattage will keep your inverter from burning out. For example, if your total wattage totals 1,500 watts then purchase the 2,000-watt device.

Shunt Battery Monitor

Everything You Need to Know About Installing Lithium Batteries in an RV (3)

We’ve recommended installing lithium batteries with built-in battery management systems, but having a shunt battery monitor is necessary. A Smart Shunt like Victron’s Lithium Battery System shows you information the BMS doesn’t and displays it conveniently wherever you want it.

A shunt monitor measures your lithium batteries’ voltage and current draw performance in real-time. It uses this information to show you how your batteries are operating. You can learn:

  • How much power you have left in your battery bank
  • The level of energy consumption the RV’s using right now
  • A projection of the remaining power left at your present energy consumption level

There’s other information it displays. While the BMS gives you basic information about each battery, the shunt battery monitor looks at the overall system. Using a Smart Shunt allows you to connect via Bluetooth to your mobile device to see everything in greater detail. Victron’s display is a basic digital device that shows the readings individually.You can see how it all works together on your phone or tablet.

Can I Add Solar Panels to My Existing RV Electrical System?

Once you’ve installed lithium batteries and the peripherals into your RV, you can add solar panels to your existing system. While it’s a discussion for another time, we can say that the lithium battery installation we walked you through sets you up for an RV solar system.

Have you upgraded your RV by installing lithium batteries? How did it go? Share below in the comments.

For more RV-related content, sign up for the Camper Smarts newsletter that is published every Tuesday.

Brian Newman

Brian Newman and his wife joined the full-time RV lifestyle in 2017. Brian has been a freelance writer since 2019 and has a diverse background that includes literature, religion, business, finance & investment, disability, recreational vehicles, and U.S. history.


Top Articles
Latest Posts
Article information

Author: Virgilio Hermann JD

Last Updated: 11/07/2023

Views: 5387

Rating: 4 / 5 (41 voted)

Reviews: 80% of readers found this page helpful

Author information

Name: Virgilio Hermann JD

Birthday: 1997-12-21

Address: 6946 Schoen Cove, Sipesshire, MO 55944

Phone: +3763365785260

Job: Accounting Engineer

Hobby: Web surfing, Rafting, Dowsing, Stand-up comedy, Ghost hunting, Swimming, Amateur radio

Introduction: My name is Virgilio Hermann JD, I am a fine, gifted, beautiful, encouraging, kind, talented, zealous person who loves writing and wants to share my knowledge and understanding with you.