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Understanding Lithium Batteries for Your Solar Power Solution

By May 3, 2017 February 20th, 2019 No Comments

A solar power system in an RV is an efficient, practical, environmentally-friendly means of accessing power on the road. Yet, while using solar energy as a source to run everything in your RV is one thing, having that power when you need it can be a different story.

“Probably 50 percent of customers that order a solar system request lithium batteries, which efficiently store power from the sun,” says Garret Towne, president of AM Solar in Springfield, Oregon, a company that designs and manufactures solar power systems for the RV consumer market. “Lithium batteries have a lot of advantages, plus there is not a lot of maintenance and they are easy charge.”

“An interesting way to look at how lithium batteries work is in financial terms,” … “The solar panels are the income and the lithium batteries are the bank account. There needs to be plenty room in the bank account to store all of the income.”

In even simpler terms, the lithium batteries effectively store solar power from the sun and act as an energy buffer in an RV.

While AGM (or lead-acid) batteries are a viable alternative, lithium batteries have additional advantages. For example, users can typically use approximately 50 percent of the power from an AGM battery before recharging. However, lithiums can draw power from as low as 80 percent of usage before needing a charge.

They also discharge a relatively constant voltage. Microwaves or other RV appliances – for example – can work quite easily off of a 60-amp hour battery. AGM batteries, however, require approximately 300 amp hours for this type of load.

“Lithium batteries can put out a lot more currents than lead acid batteries, As an example, a Sprinter van with a 200-amp hour lithium battery bank, when fully charged, can easily run all appliances, including a mini fridge, microwave, the LED lights, laptops and other electronics. In this case, an RVer wouldn’t really have to worry about power.”

Nonetheless, capacities of lithium batteries vary from rig to rig. According to Towne, an ideal battery bank solution for a Sprinter van can be anywhere from 100 to 200 amps of energy, while some mid-sized Class C models require approximately 400 amp hours. Larger class A motorhomes need a lithium battery bank with approximately 800 amp hours. Essentially, the more amps hours that are needed to run high-power appliances, the larger the lithium battery bank an RV needs.

Other Advantages of this Solar Power Solution:

  • Extended Lifespan: Lithium batteries can last up to three times as long as AGM batteries (or more than 75 percent of its capacity after 2000 cycles).
  • No Voltage Sag: A lithium battery at 20 percent can deliver the same output voltage as it would at 80 percent (with no noticeable effects in lower power).
  • Efficient Charge/Discharge: Lithium batteries can charge to almost nearly 100 percent efficiency.
  • Easy Placement: Lithium batteries come in a variety of configurations to accommodate tight confines of RVs.

Nonetheless, capacities of lithium batteries vary from rig to rig. An ideal battery bank solution for a Sprinter van can be anywhere from 100 to 200 amps of energy, while some mid-sized Class C models require approximately 400 amp hours. Larger class A motorhomes need a lithium battery bank with approximately 800 amp hours. Essentially, the more amps hours that are needed to run high-power appliances, the larger the lithium battery bank an RV needs.

Other Advantages of this Solar Power Solution:

  • Extended Lifespan: Lithium batteries can last up to three times as long as AGM batteries (or more than 75 percent of its capacity after 2000 cycles).
  • No Voltage Sag: A lithium battery at 20 percent can deliver the same output voltage as it would at 80 percent (with no noticeable effects in lower power).
  • Efficient Charge/Discharge: Lithium batteries can charge to almost nearly 100 percent efficiency.
  • Easy Placement: Lithium batteries come in a variety of configurations to accommodate tight compartments.

“The power per cubic foot is much higher with lithium batteries over AGM batteries and the power per pound is much higher,” says Towne. “They also charge more quickly by solar energy, which means RVers don’t have to connect to shore power quite as long or even run a generator for long periods.”

Additionally, if RVers have a high output alternator in their RV, lithiums charge in a few hours while traveling. This means they can always attain a full charge even during unfavorable weather conditions.

There have been some concerns about lithium batteries being susceptible to potential fires. But, the technology in the AM Solar lithium batteries is inherently non-combustible. there are several different lithium technologies available and the LiFePO4 technology we use is non-combustible. It’s very different than the type of lithium batteries that have been known to cause fires.”

Are Lithium Batteries Right for You?

On the retail pricing side, lithium batteries are considerably more expensive than AGM batteries. However, the benefits and value are much greater.

For example, lithium batteries have a lifespan of up to ten years (while AGM lasts up to five). They also charge faster, offer 3 ½ times more usable amp hours than AGM batteries of the same weight, and have a higher resistance to cold environments. In fact, they deliver more than 80 percent of its energy in -20°C temperatures.

“Lithium batteries are more expensive but the cost pays off in the long run. If you are going to have your RV for just two years, definitely consider an AGM battery bank. If you’re are thinking of full-timing or planning on traveling for many years, lithium batteries are the way to go.”

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