Your RV Battery Questions Answered
Summary
TLDRIn this tech-savvy video, Todd tackled two common RV battery questions - is it better to have multiple smaller batteries or fewer larger ones, and is a 12V or 24V system better for powering an RV's inverter system? Focusing on lithium batteries, Todd explained that a single large battery is preferable to a bank of smaller ones to avoid balancing issues and uneven charging/discharging over time. He also recommended a 24V system with fewer batteries over 12V, as it reduces the complexity of managing multiple battery management systems. Todd's comprehensive explanations shed light on optimizing battery configurations for RV owners, equipping them with valuable knowledge to make informed decisions.
Takeaways
- 😀 Subscribe to the channel to get more tech tips.
- ❓ Discusses the pros and cons of having multiple smaller batteries vs. one larger battery for an RV system.
- ⚖️ Explains the concept of internal resistance and how it can cause balancing issues in battery banks over time.
- 🔋 Recommends using a single larger battery instead of multiple smaller ones to reduce balancing issues.
- ⚡ Explains the benefits of a 24V system over a 12V system for RV power setups, including fewer balancing issues.
- 🧠 Highlights the importance of having a single 'brain' or Battery Management System (BMS) to manage the entire battery bank.
- ⚠️ Cautions against using two 12V batteries in series to create a 24V system, as it can lead to balancing issues between the two BMS units.
- 💰 Suggests that the cost savings of a 24V system are not worth the potential balancing problems it can create.
- 🔋 Emphasizes the importance of understanding battery balancing issues to prevent premature battery failures.
- 🚀 Promotes the National RV Training Academy as a resource for learning more about RV maintenance and repair.
Q & A
What is the main topic of the video?
-The main topic of the video is RV battery systems, including comparing single large batteries versus multiple smaller batteries, as well as 12V vs. 24V systems.
Why is it better to have a single larger battery than multiple smaller batteries?
-A single larger battery is better than multiple smaller batteries because it reduces balancing issues over time. With multiple batteries, even slight differences in internal resistance can cause one battery to discharge or charge faster than the others, leading to imbalances.
What is the advantage of a 24V system over a 12V system?
-A 24V system is better than a 12V system because it has fewer balancing issues due to having fewer batteries and fewer "brains" (battery management systems) to work together.
What is a BMS (Battery Management System) and why is it important for lithium batteries?
-A BMS is a logic board or circuit board inside a lithium battery that monitors and protects the cells from issues like high/low voltage, high/low amps, and temperature fluctuations. It's important because it helps lithium batteries last longer by preventing damage to the cells.
How do the "brains" (BMS) in a 12V battery system work when two batteries are connected in series to create a 24V system?
-When two 12V batteries are connected in series to create a 24V system, each battery has its own BMS that monitors and controls only its own cells. This can lead to balancing issues because one BMS may cut off power if its cells are fully charged, even if the other battery's cells are not fully charged.
What is a battery balancer and why is it needed for a 24V system with two 12V batteries?
-A battery balancer is a component that helps balance the charge between the two 12V batteries in a 24V system. It's needed because the two separate BMS systems can cause imbalances between the batteries, and a balancer helps equalize the charge.
Why does the presenter mention that one lead-acid battery may die before the others, even if they were bought at the same time?
-One lead-acid battery may die before the others because of the balancing issues and internal resistance differences between the batteries. Over time, these small differences can cause one battery to discharge or charge faster than the others, leading to uneven wear and failure.
What is the presenter's response to the "keyboard warriors" who criticize him for talking about large battery systems?
-The presenter acknowledges that some people prefer smaller, more minimalist systems but argues that he is providing information, not bragging. He suggests that those who criticize large systems may be the ones who are bragging about their small setups.
What is the RV industry's need that the presenter mentions at the end of the video?
-The presenter mentions that the RV industry needs thousands of RV technicians and inspectors, and suggests that now is a good time to pursue a career in those fields.
What is the purpose of the "bloopers" mentioned at the end of the script?
-The "bloopers" mentioned at the end of the script are likely outtakes or mistakes made during the filming of the video, added at the end for humorous or entertainment purposes.
Outlines
📚 Welcome and Introduction to Tech Tip Tuesday
The paragraph welcomes viewers to another Tech Tip Tuesday video by the National RV Training Academy. It encourages viewers to subscribe to the channel to stay updated on the latest content. The video focuses on answering two common questions: whether it's better to have two smaller batteries or one larger battery, and whether a 12V or 24V system is preferable for an inverter system in an RV.
💡 Comparing Battery Configurations and Voltages
This paragraph delves into the differences between having multiple smaller batteries versus a single larger battery, and the pros and cons of 12V versus 24V systems in RVs. It explains that regardless of battery size or number, the goal is to ensure that the batteries work seamlessly together, sharing the load equally. However, minor variations in internal resistance among multiple batteries can lead to balancing issues over time, causing one battery to charge or discharge faster than others. Therefore, a single larger battery is preferable to minimize these balancing issues. Regarding voltage, a 24V system with fewer batteries is generally better than a 12V system with multiple batteries, as it reduces the number of battery management systems (BMS) to coordinate, thereby minimizing potential balancing problems. The paragraph provides a detailed analysis of the technical aspects and implications of different battery configurations and voltages.
Mindmap
Keywords
💡RV Training Academy
💡Lithium batteries
💡Internal resistance
💡Balancing issues
💡Battery management system (BMS)
💡12V vs 24V systems
💡Series connection
💡Battery balancer
💡Off-grid living
💡RV technicians and inspectors
Highlights
Introduction to Tech Tip Tuesday by the National RV Training Academy.
Encouragement to subscribe for more tech tips.
Discussion on whether it's better to have two smaller batteries or one bigger battery.
Comparison between 12V and 24V systems in RVs.
Explanation on the importance of battery banks working seamlessly together.
Insights into internal resistance and its impact on battery performance.
Challenges of balancing multiple batteries and its long-term effects.
Advantages of having a single larger battery over multiple smaller ones.
Explanation of battery management systems (BMS) in lithium batteries.
The significance of selecting the correct voltage system for your RV.
Introduction to battery balancers and their role in maintaining battery health.
The benefits of a higher voltage system for larger setups.
Understanding the technical nuances of setting up an efficient RV power system.
Addressing common misconceptions and questions from the audience.
Encouragement to learn more about RV maintenance and repair.
Closing remarks and invitation to explore further educational resources.
Transcripts
welcome to another Todds two minute
chech tip
Tuesday brought to you by the National
RV Training Academy the largest Hands-On
RV Training Academy in America hey
before we get to the video which I know
this is the reason why you're here go
ahead and hit the Subscribe button that
way you don't miss anything hit the
Subscribe button now thank you now back
to our Tech tip Tuesday hey this week
I'm going to go ahead and answer some of
the questions hey is it better to have
two smaller batteries or one bigger
battery and then another question is is
well what is better maybe going 12vt
systems or a 24volt system if you have
an inverted system let's go ahead and
dig into that now in both cases I'm
going to be talking about lithium
batteries but it can be applied to lead
acid batteries the question is is it
better to have more of a smaller size
battery bank or maybe less but a larger
size battery bank and in all cases
doesn't matter the batteries here's the
thing if you have multiple batteries Pro
providing power the whole goal of
actually getting a bank of batteries is
doing everything that you can in your
installation to make them work
seamlessly together what do I mean by
that they all share the load right so
you got six batteries down there doesn't
matter what type of batteries you have
they're all pushing equally to take care
of whatever demand that there may be the
problem is is when you have mult
multiple batteries they're all slightly
different on the inside now some of you
you may know the term it's called
internal resistance in other words just
of the craft the craftmanship of that
particular battery might be slightly off
of the craftsmanship of this battery
over here so on and so forth well with
those small variances it doesn't seem
like a big deal okay very small what's
the big deal over time what's going to
happen is you're going to have what's
called balancing issues One battery
because it's got a little bit more
internal resistance than the other may
have either just depending on the
discharge it may be a little bit more
charged than the battery with less
internal resistance why is that well the
battery that can provide the power
faster and uh with less resistance will
do most of the work and when it goes to
charging though the battery with less
internal resistance will get charged
faster and so over time when you have
multiple batteries we're going to see
that they get out of balance so there
was a question that someone had posted
hey what's better to have a single 200
amp hour battery or two 100 a hour
batteries now again based in this
scenario I'm going to tell you a single
200 a hour battery is far better you
won't have near as many balancing issues
over time okay now I know that a lot of
you are say Tod I've got my motor coach
here it's got six batteries in there
I've never noticed it the reason why you
never noticed it is probably because you
never checked it have you ever wondered
why One battery goes dead or goes bad
before the others you bought them all at
the same time why does one battery seem
to fail before the
others now you know all right so it is
better to have maybe one battery versus
a bank of batteries this is why there's
different sizes okay now let's go ahead
and answer the question well which is
better a 12volt system or a 24volt
system if you're going to have the
battery supply the power through an
inverter for everything else in RV okay
I will tell you it is probably better to
go 24v system here's the reason why it's
the same concept if I have multiple
12volt batteries versus fewer 24volt
batteries right I have less balancing
issues not only that but if we're
talking lithium okay if we're talking
lithium batteries inside the lithium
battery cell should be not in the cell
but inside the Box itself should be an
internal BMS now that just stands for
battery management system guys it's one
of the first batteries that we have and
I'm sure going forward this is the way
it'll be where we put a logic board
inside and we get it to address all the
different concerns because there's just
different things that go on inside that
battery and that's what makes lithium
right now so much better because we're
putting in circuit boards and we're
protecting those cells too high voltage
too low of voltage too high amps to low
of amps um uh temperature controls all
of that we're able to put that in there
which means the batteries last longer
but here's the thing if I have a 12vt
battery and another 12volt battery and I
put them in series to create a 24volt
connection okay I've got two brains now
working and the batteries are what we
call direct current what does that mean
well electrons flow one way so here you
have two posts you got your positive in
your negative now one of the posts when
we are discharging we're pulling power
from the battery goes out one of the
posts and when we're charging it comes
back in the other post make sense I'm
hoping it makes sense okay now when you
put two together one positive to one
negative two different batteries I still
have one positive and one negative open
so on the discharge of my lead battery
what's going to happen is the BMS inside
those brains inside are going to start
looking at the cells of that one battery
the BMS on this battery doesn't look at
that BMS over there doesn't even see it
and it's saying hey we're discharging
and we're getting pretty D Dam low the
other one which is next to it is just
slightly further away and it's going to
have a less of a well it's going to have
a little bit more charge to it just a
little bit okay because we see we have
two different ones well again same thing
this one's going to charge faster this
one's going to discharge faster and I
have two brains so what's going to
happen those brains are set up inside to
where they will cut power in out if the
cell is too charged or too undercharged
okay what does that mean well that means
that even though this battery over here
is not fully charged this battery is
stopping it because it's fully charged
boom boom now you get little problems
again what am I breaking it all down to
let me make it easy balancing issues
okay balancing issues if you're going to
go with a 24volt system and you're using
12vt batteries in order to really work
with the two brains you have to add
another component called a battery
balancer okay or you could just simply
buy a battery at the voltage that you're
looking for 24 volts or 48 volts I know
that's detailed uh just a little bit but
if you really wanted to know cuz I know
people will start chasing oh well if I
go with a 24volt battery that means
smaller wire yes that is true um it it
it may save you 5 or 10 pounds total in
the bill that you have and maybe save
you about 50 bucks okay and to me those
two factors when you're talking about
say a slightly larger system it's not a
big deal the game changer if I were to
use that term when we're talking about
going 12 to 24 is being able to have one
brain handle all 24 volts now checking
eight cells instead of four with Two
Brains okay far less inconveniences okay
so hopefully that'll help out the bigger
the cell and the higher the voltage you
have for a larger system means fewer
batteries what does that mean less
balancing issues which means down the
line 7 8 year n maybe even year 10
they're all still going to be the same
as close as possible remember if you
have six batteries lead acid batteries
one dies before the other and you never
asked why well now you know oh and by
the way for you keyboard Warriors CU I
know you're going to do this Tod you
always talk about big systems why do you
always brag about big systems this is
what I can do I can live off of a half
of a battery with my fart fan and it be
72° right because I don't need a big
system blah blah blah blah blah why you
bragging about big
systems my question is why you bragging
about such a small system right bragging
is bragging right I'm not bragging I'm
providing information when you keyboard
Warriors send it back and said I don't
understand why people need multiple
batteries and big old systems to run
everything living off- grid means to
live you know very small small in a very
small footprint okay good on you I'm
glad you do that right but you telling
me that in the comments now you're
bragging you ever thought about that by
the way if you're truly off
grid what are you doing on the
internet you should be out there hunting
with the Bears and the wolves and
everything else getting your food and
just living with maybe a little bitty
knife there's your challenge
I kid I kid hey there's your Tech tip
all right before you get to the bloopers
which is why you're here in the first
place the RV industry needs thousands of
RV technicians and inspectors and now is
the perfect time to do that if you want
to make more money or have more control
over your time go ahead and click the
link below or if you just want to learn
how to fix your own RV got something for
you there head over to rvtech course.com
and get started today now for the Reon
that you're at the end of the video roll
the bloopers are we
ready I can't I kid we hopefully we hope
and I apologize for the name I'm sure
it's going to be right here now I leave
it up to the editor to put it right
here
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