12V vs 24V: What’s The Difference In Battery Systems?
In everyday life, batteries are used by everyone of us. Batteries are a part of our life, whether they are in our remote control, watch, automobile, or RV. Most of the time, we don't need to consider a battery's voltage. A critical choice must be made between 12V and 24V when working with DC power systems for RVs, watercraft, or off-grid applications.
The differences between 12V and 24V systems and batteries will be covered in this article. Let's get started!
What variations exist between the 24V and 12V operating systems?
What is the Voltage of an Electrical System in a Car, RV, or Boat?
There are rare exceptions, but 12-volt electrical systems are often used in automobiles, RVs, and boats. So when do you utilise 12V and
24V batteries?
We must first comprehend what volts or voltage are in order to learn more about batteries. The voltage required to drive an electrical current is the strength of the electrical pressure. In order to comprehend this idea better, consider what volts are.
What Is Meant by "12V"?
12V indicates that the battery can deliver 12 volts when a nominal load is applied. In that a 24V battery bank produces 24 volts, the same idea applies.
As we previously covered, the majority of RV and automobile batteries are 12V.
Most automobiles utilise 12 volt batteries because electrical parts like the starter, lights, and ignition systems are made to run on this voltage.
A battery's nominal voltage, which is 12 volts, may actually be a little higher or lower depending on the load and charge level.
Due to the larger vehicle's greater power requirements and extensive wire runs, we occasionally employ 24V battery packs in larger trucks and buses. Additionally, bigger boats and even RVs with sophisticated solar systems can be seen using 24V.
A 24V system is also frequently used in trolling motors on fishing boats.
How is a 24 volt system created?
A 24V system is one that generates 24V at nominal load. There are a few methods for developing a 24V power system. One option is to get a 24V battery. The second method is to build a 24V system by connecting two 12V batteries in series. Let's examine these possibilities in greater depth.
What does 24 V stand for?
Using a 24V battery is one technique to build a 24V system. Less frequent and more difficult to get than its 12V sibling, 24V batteries. Additionally, 24V batteries are rather pricey.
They do, however, use less space than connecting additional batteries in series. Therefore, a single 24V battery would be a better option for you if space is an issue.
How Are 12V Batteries Connected In Series?
The most typical way to construct a 24V system is to connect batteries in series.
When batteries are connected in series, they share a single electrical route with the system's total volts. Therefore, 2x12V=24V if two 12V batteries are connected in series.
You would connect the "+" positive terminal of the first battery to the "-" negative terminal of the second battery to convert a pair of 12V batteries into a 24V system. Similar to when utilising a single battery, the remaining positive and negative wires are linked to the component you wish to power. The same technique may be done using four 6 volt batteries.
Let's examine something we are all familiar with, a torch, to help you understand this better. Batteries connected in series are commonly used in flashlights. Let's say you have a powerful torch that requires four "C" size batteries.
The batteries are arranged in a single row with the negative and positive touching when you install them. This circuit is in series. The 1.5V of each "C" battery. As we previously know, when batteries are connected in series, the output voltage is the sum. The torch in this instance is powered by 6 volts.
Almost all batteries with a voltage higher than 2 volts are composed of a series connection of many cells. If you were to open up one of your smoke detector's 9 volt batteries, you would notice that they contain numerous cells.
Comparing the advantages of 12V and 24V
There are various advantages and disadvantages to each system type when comparing 12V and 24V systems. Let's examine some of each's advantages.
Benefits of a 12V System
12V systems, which we covered previously in the text, are very typical. Since most automotive parts are 12V-compatible, most automobiles run on 12V systems. For the battery to be charged, the alternators produce 12V.
The majority of RV-related products, including refrigerators and all lighting, operate on 12V as well. 12V systems just need a single battery and are ideal for low-power uses with limited cable lines.
Due to its simplicity and compatibility with the majority of RV items, 12 volt systems are excellent. It's simple to connect them to smaller solar systems as well.
Benefits of a 24V System
The use of smaller diameter wire and a two-fold reduction in amperage are advantages of 24V systems. The cost of wiring and the amount of area required to run cable can both be decreased by using smaller diameter wire. This is crucial when there are extensive wire lines involved.
But hold on, how do you run a thinner cable at a higher voltage?
In actuality, a wire 2x smaller than a comparable 12V circuit may be run. This is so that the same amount of power may be produced at a greater voltage with less current. We may utilise a smaller wire since we are operating at lower current or amp levels. Power is transmitted over power lines at extremely high voltages for the same purpose. The cables can transport a lot more power while being much, much smaller!
Using greater voltages, such as 24 or 48 volts, while developing bigger portable solar power systems is particularly advantageous. The solar system for Geo Astro RV has thousands of watts.
In addition to having shorter cables, 24 volt systems run motors and inverters more effectively. Frequently, a solar charge controller that runs on 24V instead of 12V may take twice as much solar input.
Comparing 12V Vs. 24V Cons of Each Just as there are advantages to using 12V vs. 24V systems, there are disadvantages as well. Some advantages of one system might turn into disadvantages of the other.
Cons of 12V Because the current (amps) is larger, 12V systems need bigger lines to draw heavy loads. A disadvantage of a 12V system is that the amperage is double that of a 24V system at the same power, as we have previously discovered, while 24V systems lower the current or amps by a factor of two.
For high power devices like inverters that operate at 12 Volts, very large cables are required; in this instance, two cables are utilised to manage the current. All that would be required if this were a 24-volt system are those cords.
Due to resistive losses, 12V batteries are less efficient than a 24V battery since they need two times the amperage for a given power consumption.
Pitfalls of 24V
You will need a converter to lower the voltage to 12V if you are utilising a 24V system with 12V appliances. There are not as many different parts and gadgets available for 24V as there are for 12V.
This additional piece of equipment is required because the system is a 24 volt one installed in an RV. It is a converter from 24 to 12 volts DC. Although it provides steady voltage extremely well, there is an additional expense and a 4% energy loss.
Although a vehicle's alternator may be used to charge a 12V battery, doing so with a 24V system if the chassis is a 12V system is not possible. For this purpose, more DC-DC converters are required.
When to Use a 24V System vs. A 12V System
We need to know when to employ 12V vs. 24V systems over the other now that we have a basic understanding of them.
Understanding your power needs to run the appliances you require is essential when creating a DC (direct current) battery system. Watts are a unit of measurement for a device's energy consumption. You can choose the necessary system after you are aware of your wattage requirements.
You can typically get away with a 12V system if your needs are less than 3000W.
When your power requirements exceed 3000W or you are producing 3000W or more of solar electricity, several experts advise 24V systems. At this stage, the advantages of a 24V system much outweigh the drawbacks because you can run smaller and boost the system's productivity.
If your power usage is even greater, above 6000W, you might want to upgrade to a 48V DC system and take advantage of an even larger DC system.
Benefits Of Solar At 24V DC
Many DC MPPT solar charge controllers can manage larger panel voltages thanks to their higher voltage capabilities. However, they have a strict current cap.
You may utilise a charge controller with a 50 amp rating on a 12V battery bank and 700 watts of solar power. The same charge controller can connect to 1400 watts of solar panels when used with a 24V battery system. This implies that only half as many solar charge controllers are required. At 24 volts, they will also run more effectively.
Which Is Right For Me: 12V or 24V?
The choice isn't always easy to make. When deciding which one is the greatest option, there are several factors to take into account.
These systems are not as daunting as we first imagined since we now understand them better. Regardless of whether you choose a 12V or 24V system, you now know the distinctions. You may evaluate your requirements and come to an informed conclusion.
