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What is a battery bank? No, battery banks are not some financial battery establishments. A battery bank is connecting two or more batteries together for a single application. You might ask, what does this accomplish? By linking batteries together, you can increase the voltage, capacity (AH / Wh), or both.
When you need more power, you can construct a battery bank using widely available batteries. For instance, using a common group-size battery such as a group 24, group 27, group 31, or golf cart GC2 group size is much more affordable than purchasing a heavy group 4D or 8D battery for your RV, camper, trailer, or boat.
The first thing you need to know is that there are three primary ways to successfully connect batteries: The first is via a series connection, the second is called a parallel connection, and the third option is a combination of the two called a series-parallel connection.
Connecting batteries in series increases the voltage of a battery pack, but the AH rating (also known as Amp Hours) remains the same. For example, these two 12-volt batteries are wired in series and now produce 24 volts, but they still have a total capacity of 35 AH.
To connect batteries in a series, use a jumper wire to connect the first battery's negative terminal to the second battery's positive terminal. This leaves you a positive terminal on the first battery and a negative one on the second battery to use for your application.
When connecting batteries: Never cross the remaining open positive and negative terminals with each other, as this will short-circuit the batteries and cause damage or injury.
Be sure the batteries you're connecting have the same voltage and capacity rating and are of the same batch. Otherwise, you may end up with charging problems and shortened battery life.
The other type of connection is parallel. Parallel connections will increase your capacity rating, but the voltage will stay the same. In the &#;Parallel&#; diagram, we're back to 12 volts, but the amps increase to 70 AH. It's important to note that if you plan on pulling more amperage than the system was designed for, you may need to upgrade to a heavier-duty cable to keep the wires from burning up.
To join batteries in parallel, use a jumper wire to connect positive terminals together, and another jumper wire to connect negative terminals together. This establishes negatives to negatives and positives to positives. You CAN connect your load to ONE of the batteries, which will drain both equally. However, the preferred method for keeping the batteries equalized is connecting to the positive at one end of the battery pack and the negative at the other end.
If you have two sets of batteries connected in series, you can wire both sets into a parallel connection to make a series-parallel battery bank. In the images below we will walk you through the steps to create a 24 volts 70 AH battery pack.
Don't get lost now. Remember, electricity flows through parallel or series connections as if it were a single battery. It can't tell the difference.
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Therefore, you can parallel two sets of batteries that are in series to create a series-parallel setup.
First, we recommend putting each set in series first. To do this, you will use a jumper between the inner positive and negative terminals of each set to increase the voltage, as seen in the picture below:
Once each set has been put in series, you can use jumpers to parallel each set together. Basically, the outer positives to positives and outer negatives to negatives, as seen in the final picture below:
Many customers ask if they can put a set of batteries in parallel first and then in series. Either way is okay, as electricity will flow through parallel or series connections like it would if you were only using two batteries.
In other words, there is no right or wrong method. However, most customers prefer to put their batteries in series first because it allows them to use onboard desulfators more effectively to extend battery life.
Don&#;t be concerned if a terminal has more than one cable connected to it. It's necessary to construct these kinds of battery banks successfully.
In theory, you can connect as many batteries as you want. But when you start constructing a tangled mess of batteries and cables, it can be very confusing, and confusion can be dangerous. Keep in mind the requirements for your application, and stick to them. Also, use batteries of the same capabilities. Avoid mixing and matching battery sizes wherever possible.
Always remember to be safe and keep track of your connections. If it helps, make a diagram of your battery banks before attempting to construct them. Good luck!
AMP Hour is a unit of measure for a battery's electrical storage capacity. A manufacturer will subject the battery to a specific amp draw over a 20 hour timeframe in order to determine the AH capacity. The amp/hr rating can significantly change based on the given load applied for more information see our article: Peukert&#;s Law | A Nerd&#;s Attempt to Explain Battery Capacity.
Voltage represents the pressure of electricity. Some applications require more "pressure," meaning higher voltage.
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