High Voltage vs. Low Voltage: What&#;s the Best Choice for Home Energy Storage?

High voltage and low voltage lithium battery systems are both popular choices for Solar PV systems. But which one is the best choice for your needs? In this article, we will compare and contrast High Voltage (HV) and Low Voltage (LV) lithium battery systems, so you can decide which one is right for you.

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Overview

1. What Is Low Voltage Battery System?

2. What Is High Voltage Battery System?

3. The High Voltage Home Battery Backup Are More Expensive To Install?

4. Find The Best Home Solar Battery Backup For Your Needs.

WHAT IS LOW VOLTAGE BATTERY SYSTEM?

The voltage of low-voltage home battery backup is typically less than 100V. As these types have less voltage, they also provide less power than high voltage battery system would do.

Low-voltage home battery backup offer a number of advantages. For starters, they are easier to install and upgrade. For example, connect multiple batteries together in parallel or series. Additionally, low-voltage Home Solar Battery Backup have a smaller physical footprint. This makes them ideal for applications where space is limited. Furthermore, low-voltage batteries are cheaper to manufacture than high-voltage batteries. Finally, low-voltage batteries are in some ways safer. But low voltage home energy storage systems have trouble with start-up loads, this can be resolved by hooking up your system temporarily using grid or solar energy &#; but this takes time!

Low-voltage solar batteries for home are often used in off-grid systems where customer demand for medium to low energy is high. But inverters play a crucial role in choosing what&#;s kinds of batteries. Each inverter has a battery voltage range [V], which indicates whether the inverter can manage a high or low voltage battery. Typical battery inverters are rated at 48V or above and can handle both high and low voltage batteries. When choosing an inverter for a low-voltage home energy storage systems, it is important to select an inverter with a voltage range that includes the nominal voltage of the battery.

WHAT IS HIGH VOLTAGE BATTERY SYSTEM?

The high voltage battery systems are usually rated at more than 100V. These powerful batteries can charge and discharge faster than low-voltage ones, making them ideal for covering those quick demand surges from starting equipment that might not be able to stay running without power immediately. The increased volts also mean smaller conductors.

High-voltage battery systems are a more recent development in the world of home solar battery backup. These higher voltage models can provide increased energy output to support heavier loads, making them perfect for homes with electricity consumption rates that exceed what is typically seen at lower voltages

Commissioning a home battery backup with an high-voltage battery not only increases efficiency but also saves energy. The DC bus voltage normally varies between 300 volts and 500 V, so when you choose this option your inverter has less work to do. When you choose a low-voltage home battery backup, the inverter needs to work harder and reduce an input voltage of 300 -500V below 100 V. This results in less energy efficiency for your home or business&#;s power requirements.

High voltage battery systems are perfect for properties with commercial energy storage demands and home battery backup use. They offer a number of advantages over other types of batteries, including longer life and higher discharge rate. In addition, high voltage battery systems are less likely to overheat, making them safer to use. With their many benefits, it&#;s no wonder that high voltage home battery backup are becoming increasingly popular.

THE HIGH VOLTAGE HOME BATTERY BACKUP ARE MORE EXPENSIVE TO INSTALL?

Generally speaking, the price of high-voltage batteries in the market is higher than that of low-voltage batteries. The main reason for this is the high manufacturing cost of high-voltage batteries and the brand premium. However, there are a number of factors that can affect the price of lithium batteries, including the type of battery, the size of the battery, and the quality of the battery. In addition, lithium battery prices can also vary depending on the supplier. As a result, it is important for buyers to compare prices from different suppliers before making a purchase.

FIND THE BEST HOME SOLAR BATTERY BACKUP FOR YOUR NEEDS

So, what is the takeaway from all of this? First and foremost, it&#;s important to understand that there is a big difference between high voltage and low voltage battery systems. Secondly, inverter brands are starting to provide more high voltage battery system options for their customers; however, both types of batteries still have a place in the market. If you&#;re looking for the best price on a home solar battery backup battery, contact Bonnen Battery today.

If you are worried about the high price of high-voltage home solar battery backups. Bonnen Battery is here to help. We offer home battery backups at an affordable price, and we even have a factory direct program that can save you even more money.

With our high quality products and low prices, you can&#;t go wrong with Bonnen Battery. Plus, our batteries are backed by a 5-years warranty so you can be sure you&#;re getting the best possible product.

Ask for a quick quote for our High Voltage All-In-One Home Energy Storage System.

Contact Bonnen Battery&#; now and learn more about our Battery Energy Storage System BESS solutions!

When it comes to choosing the right battery for your application, you likely have a list of conditions you need to fulfill. How much voltage is needed, what is the capacity requirement, cyclic or standby, etc.

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Once you have the specifics narrowed down you may be wondering, &#;do I need a lithium battery or a traditional sealed lead acid battery?&#; Or, more importantly, &#;what is the difference between lithium and sealed lead acid?&#; There are several factors to consider before choosing a battery chemistry, as both have strengths and weaknesses.

For the purpose of this blog, lithium refers to Lithium Iron Phosphate (LiFePO4) batteries only, and SLA refers to lead acid/sealed lead acid batteries.

Here we look at the performance differences between lithium and lead acid batteries

CYCLIC PERFORMANCE LITHIUM VS SLA

The most notable difference between lithium iron phosphate and lead acid is the fact that the lithium battery capacity is independent of the discharge rate. The figure below compares the actual capacity as a percentage of the rated capacity of the battery versus the discharge rate as expressed by C (C equals the discharge current divided by the capacity rating). With very high discharge rates, for instance .8C, the capacity of the lead acid battery is only 60% of the rated capacity. Find out more about C rates of batteries.

Capacity of lithium battery vs different types of lead acid batteries at various discharge currents

Therefore, in cyclic applications where the discharge rate is often greater than 0.1C, a lower rated lithium battery will often have a higher actual capacity than the comparable lead acid battery. This means that at the same capacity rating, the lithium will cost more, but you can use a lower capacity lithium for the same application at a lower price. The cost of ownership when you consider the cycle, further increases the value of the lithium battery when compared to a lead acid battery.

The second most notable difference between SLA and Lithium is the cyclic performance of lithium. Lithium has ten times the cycle life of SLA under most conditions. This brings the cost per cycle of lithium lower than SLA, meaning you will have to replace a lithium battery less often than SLA in a cyclic application.

Comparing LiFePO4 vs SLA battery cycle life

CONSTANT POWER DELIVERY LITHIUM VS LEAD ACID

Lithium delivers the same amount of power throughout the entire discharge cycle, whereas an SLA&#;s power delivery starts out strong, but dissipates. The constant power advantage of lithium is shown in the graph below which shows voltage versus the state of charge.

Here we see the constant power advantage of lithium against lead acid

A lithium battery as shown in the orange has a constant voltage as it discharges throughout the entire discharge. Power is a function of voltage times current. The current demand will be constant and thus the power delivered, power times current, will be constant. So, let&#;s put this in a real-life example.

Have you ever turned on a flashlight and noticed it&#;s dimmer than the last time you turned it on? This is because the battery inside the flashlight is dying, but not yet completely dead. It is giving off a little power, but not enough to fully illuminate the bulb.

If this were a lithium battery, the bulb would be just as bright from the beginning of its life to the end. Instead of waning, the bulb would just not turn on at all if the battery were dead.

CHARGING TIMES OF LITHIUM AND SLA

Charging SLA batteries is notoriously slow. In most cyclic applications, you need to have extra SLA batteries available so you can still use your application while the other battery is charging. In standby applications, an SLA battery must be kept on a float charge.

With lithium batteries, charging is four times faster than SLA. The faster charging means there is more time the battery is in use, and therefore requires less batteries. They also recover quickly after an event (like in a backup or standby application). As a bonus, there is no need to keep lithium on a float charge for storage. For more information on how to charge a lithium battery, please view our Lithium Charging Guide.

HIGH TEMPERATURE BATTERY PERFORMANCE

Lithium&#;s performance is far superior than SLA in high temperature applications. In fact, lithium at 55°C still has twice the cycle life as SLA does at room temperature. Lithium will outperform lead under most conditions but is especially strong at elevated temperatures.

Cycle life vs various temperatures for LiFePO4 batteries

COLD TEMPERATURE BATTERY PERFORMANCE

Cold temperatures can cause significant capacity reduction for all battery chemistries. Knowing this, there are two things to consider when evaluating a battery for cold temperature use: charging and discharging. A lithium battery will not accept a charge at a low temperature (below 32° F). However, an SLA can accept low current charges at a low temperature.

Conversely, a lithium battery has a higher discharge capacity at cold temperatures than SLA. This means that lithium batteries do not have to be over designed for cold temperatures, but charging could be a limiting factor. At 0°F, lithium is discharged at 70% of its rated capacity, but SLA is at 45%.

One thing to consider in cold temperature is the state of the lithium battery when you want to charge it. If the battery has just finished discharging, the battery will have generated enough heat to accept a charge. If the battery has had a chance to cool down, it may not accept a charge if the temperature is below 32°F.

BATTERY INSTALLATION

If you have ever tried to install a lead acid battery, you know how important it is to not install it in an invert position to prevent any potential issues with venting. While an SLA is designed to not leak, the vents allow for some residual release of the gasses.

In a lithium battery design, the cells are all individually sealed and cannot leak. This means there is no restriction in the installation orientation of a lithium battery. It can be installed on its side, upside down, or standing up with no issues.

BATTERY WEIGHT COMPARISION

Lithium, on average, is 55% lighter than SLA. In cycling applications, this is especially important when the battery is being installed in a mobile application (batteries for motorcycles, scooters or electric vehicles), or where weight may impact the performance (like in robotics). For standby use, weight is an important consideration in remote applications (solar fields) and where installation is difficult (up high in emergency lighting systems, for example).

A comparision of lithium and lead acid battery weights

SLA VS LITHIUM BATTERY STORAGE

Lithium should not be stored at 100% State of Charge (SOC), whereas SLA needs to be stored at 100%. This is because the self-discharge rate of an SLA battery is 5 times or greater than that of a lithium battery. In fact, many customers will maintain a lead acid battery in storage with a trickle charger to continuously keep the battery at 100% so that the battery life does not decrease due to storage.

SERIES & PARALLEL BATTERY INSTALLATION

A quick and important note: When installing batteries in series and parallel, it is important that they are matched across all factors including capacity, voltage, resistance, state of charge, and chemistry. SLA and lithium batteries cannot be used together in the same string.

Since an SLA battery is considered a &#;dumb&#; battery in comparison to lithium (which has a circuit board that monitors and protects the battery), it can handle many more batteries in a string than lithium.

The string length of lithium is limited by the components on the circuit board. Circuit board components can have current and voltage limitations that long series strings will exceed. For example, a series string of four lithium batteries will have a max voltage of 51.2 volts. A second factor is the protection of the batteries. One battery that exceeds the protection limits can disrupt the charging and discharging of the entire string of batteries. Most lithium strings are limited to 6 or less (model dependent), but higher string lengths can be reached with additional engineering.

There are many differences between SLA and lithium battery performance. In most instances, lithium is the stronger battery. However, SLA should not be discounted as it still has an edge over lithium in some applications, like long strings, extremely high rate of discharge, and cold temperature charging. If there is an application not covered above, or if you have additional questions, please feel free to contact us.

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