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How to Charge a Deep Cycle Battery Properly – Getting the Most Out of Your Solar Battery Bank

By SSK Admin December 13, 2021

How to Charge a Deep Cycle Battery Properly

How to Charge a Deep Cycle Battery Properly – Getting the Most Out of Your Solar Battery Bank

Whether you already own a solar power system, or you are just getting into solar power, you will want to familiarize yourself with deep cycle solar batteries. These unique batteries are perfectly suited for solar applications, as they have the ability to be discharged down to extremely low power levels.

While it is fairly simple to install a solar battery bank, it is still worth taking the time to learn how to charge a deep cycle battery properly. Not only is this important from a safety perspective, properly charging your deep cycle solar batteries will also extend their lifespan and ensure they are charging and discharging efficiently at all times.

How Can We Help?

To help you get the most from your deep cycle solar batteries, we are going to tell you how to charge a deep cycle the correct way. We will go over everything you need to know about setting up a deep cycle battery, as well as the other pieces of solar equipment you will need to connect to your battery for it to run properly. 

From there, we will even recommend some high-quality deep cycle batteries and solar power inverters you can use to build your own solar power storage system.

If you have questions about charging deep cycle batteries, you have come to the right place! 

What are Deep Cycle Batteries? 

Deep cycle batteries are specifically designed to provide sustained and reliable power over long stretches of time. They stand in contrast to other types of batteries, which are usually only designed to supply short bursts of energy before they need to be recharged. For example, automotive batteries are designed to supply a quick burst of electricity, which is used to start the vehicle’s engine.

Unlike most batteries, deep cycle batteries can be discharged up to 80%; however, most manufacturers recommend not discharging below 45%, as doing so on a regular basis can reduce the total lifespan of the battery

How do They Work in a Solar Power System?

As you would expect, deep cycle batteries that are used as part of an off-grid or hybrid solar power system work by storing the energy that is collected from your solar panels, so it can be used at your convenience.

The higher the deep cycle battery’s capacity, the more solar energy it is able to store. While it all sounds fairly straightforward, it is not quite as simple as connecting a deep cycle battery directly to your solar panels. You will also need to select an appropriate charge controller and power inverter for your solar panels and deep cycle battery.

How to Choose the Correct Deep Cycle Battery 

As with every component of a solar power system, there are certain specifications you should look out for when evaluating your solar battery options. For starters, you will want to know how long each solar battery will last and how much power it can actually store.

You will also want to take the following factors into consideration:

The Battery’s Capacity and Power Rating:

Capacity is the amount of electricity that a solar battery is capable of storing and, in most cases, it is measured in watt hours (Wh). While capacity tells you how much the battery can hold, it does not tell you how much electricity it can deliver at one time. For this information, you need to take a look at the solar battery’s power rating, which is usually measured in watts (W).

A battery with a high capacity and a low power rating would deliver a low amount of electricity over a long period of time, while a low capacity solar battery with a high power rating could power more demanding electronic devices, but for a much shorter period.

To find the perfect battery for your solar power system, you need to take capacity and power rating into consideration and find an option that delivers exactly what you need. 

Cycle Life:

Like any other type of battery, the actual storage capacity of a solar battery will decrease the more you use it. As any battery ages, it will struggle to hold the same charge it did when it was first purchased.

Most solar battery manufacturers will list the cycle life of their batteries, so you will have a rough idea of how many times you can charge and discharge the battery if it is being used correctly.

Affordability and Overall Quality:

With solar batteries, price is not always a direct indicator of quality, so it is worth taking a look at affordable solar batteries from reputable brands. You will want to look for other indicators of quality, such as extended warranties, waterproof casings, simple installation guarantees, and more.

Preparing the Battery to Charge Properly

Once you have chosen a deep cycle battery that meets your power needs and budget, you will need to inspect the battery and pair it with the appropriate charge controller and inverter for your solar power system’s specific needs.

Visually Inspect the Battery: 

Before you connect any deep cycle battery to your solar power system, you will want to make sure the housing is free of cracks and splits, visible signs of corrosion, and other issues. Even if the battery was purchased new, it is always worth checking to make sure it is in good condition, as a damaged battery can be a safety issue and even impact the performance of your other solar equipment. 

Connect Your Deep Cycle Battery to an Appropriate Charge Controller and Power Inverter:

A charge controller will regulate the flow of power from your solar panels to your deep cycle battery. They regulate the voltage and current to prevent your battery from overcharging, which could damage the battery and reduce its ability to hold a charge.

Since solar panels convert sunlight into Direct Current, or DC power, you will need a power inverter that can convert that power into Alternating Current, or AC power, which is what your electronic devices and appliances require. Power inverters can also help with efficiency by tracking the voltage of the solar array to identify the maximum power that the modules can operate. 

Your charge controller and power inverter will both need to matched up to the power requirements of your solar panels and deep cycle battery, or batteries.

For more information about choosing the correct solar power inverter for your specific deep cycle batteries, we encourage you to take a look at our Collection of Solar Power Inverters. We provided a quick guide on choosing the right option. You can then browse the collection and find the right option for your system.

Connecting your charge controller and power inverter to your solar panels and deep cycle battery is actually fairly simple. Most manufacturers will include a simple set of instructions for the wiring process. You will want to connect them to your battery before you wire everything to your solar panels, as this will give you the opportunity to make sure everything is connected properly, without power flowing through the system. 

Monitor Your Deep Cycle Batteries:

Once everything is up and running, you will want to regularly monitor the performance of your batteries. This means checking the state of charge and discharge. You can always detach your battery from the system and use a voltmeter to check the true voltage, which will give you an indication of how well the battery is actually performing.

If you notice any performance issues, it could be possible that your battery is not paired to an appropriate or efficient charge controller. It could also mean that your battery is damage or has lost its ability to hold a charge, in which case, you would want to replace the battery, or load test the battery to make sure it is actually the battery’s condition that is at fault for the performance issue.

Avoid Exposing Your Deep Cycle Batteries to Extreme Conditions:

Deep cycle batteries perform better when they are not exposed to extreme or volatile temperatures and weather conditions. Keep any deep cycle batteries you are using away from extreme heat or cold and try to keep them in a location where the temperature will be relatively stable. This also applies for the charge controller and power inverter.

Deep cycle batteries can also be very susceptible to water damage, so you will want to keep them in a dry location that is not exposed to temperamental weather. When choosing a location for your deep cycle batteries, stability is key.

Choosing Deep Cycle Batteries for Your Solar Power System 

No matter what your power storage needs are, you will find high-quality replacement batteries by shopping our Deep Cycle Solar Battery Collection

You can also specifically shop our Renogy Solar Collection, which contains a wide variety of deep cycle batteries, solar power inverters, charge controllers, and more. Renogy is a highly-reputable brand that is known for offering high-quality solar equipment at fair prices, so it is worth familiarizing yourself with the solar storage products they offer.

If you are just starting out with solar power, you might want to consider taking a look at our Renogy Solar Kits, as they contain everything you need to get started, including deep cycle batteries, power inverters, charge controllers, solar panels, and all of the cables and connectors you would need to wire everything together. 

Final Words

If you have more questions about how to charge a deep cycle battery properly, or you would just like to know how to assemble your own solar power bank, we encourage you to read our DIY Mini Course on Solar Power Storage. It explains everything you need to know about deep cycle solar batteries and solar generators. 

While choosing a high-quality deep cycle battery is important, how you wire and monitor that battery will significantly impact its charge performance.

If you have further questions about deep cycle solar batteries, or any other questions about solar power, we encourage you to reach out. We are always here to help you get started with solar power!


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