The house solar battery has become one of the essential components of a solar system, but there are many specialized questions waiting to be understood by those new to the solar industry, such as the difference between peak power and rated power, which is one of the most frequently asked questions at HOCHIRY. It is important to distinguish between peak power and rated power, which allows you to know which loads your house solar battery can power at a given time.
When comparing solar home battery system options, there are some key technical specifications to look at and questions to answer. how much energy can a home lithium battery store? what part of your home can a home lithium battery power and for how long? If the grid goes down, will the home lithium battery continue to power part or all of your home? And, will your home lithium battery provide a large enough burst of instantaneous power to run your largest appliances, such as your air conditioner?
To address these questions, you first need to know the difference between rated power and peak power, which we’ll discuss in this article.
At HOCHIRY, we want to share our experience with lithium batteries with you, so you know everything you need to achieve power freedom with a lithium battery energy storage system. So, if you have any questions about Lithium ion solar batteries, please contact us.
In my previous article “The Indication of kWh For Lithium Batteries Solar Power Storage”, I explained the difference between kW and kWh, which is a unit of measurement of electrical power. It is calculated from the voltage in volts (V) and the current in amperes (A). Your home outlet is usually 230 volts. If you connect a washing machine with a current of 10 amps, that outlet will provide 2,300 watts or 2.3 kilowatts of electricity.
The specification kilowatt hour (kWh) indicates how much energy you use or produce in an hour. If your washing machine runs for exactly one hour and draws 10 amps of power constantly, it consumes 2.3 kWh of energy. You should be familiar with this information. This is because the utility bills you for the amount of electricity you consume based on the kilowatt hours shown on the meter.
Peak power is the maximum power that a power supply can sustain for a short period of time and is sometimes referred to as peak surge power. Peak power is different from continuous power, which is the amount of power that a house solar battery can provide continuously. Peak power is always higher than continuous power and is only needed for a limited period of time.
A high power house solar battery will be able to provide enough power to drive all components and perform the intended function of the load or circuit. However, a house solar battery with exactly 100% load capacity may not be enough due to losses and other factors that may affect load efficiency.
The purpose of having peak power is to ensure that the house solar battery can handle load spikes and protect the power supply, thereby preventing spikes from damaging the power supply. For example, a 5 kW power supply can have a peak power of about 7.5 kW in 3 seconds. Peak power varies from one power supply to another and is usually specified in the power supply data sheet.
The power rating of a Lithium battery determines what and how many devices you can run on your home battery system at the same time. Today’s most popular batteries have a standard rating of 5kW (e.g. Huawei’s Luna 2000; LG Chem RESU Prime 10H or SolarEdge Energy Bank); however, other brands such as BYD batteries are rated at over 7.5kW, (25A), HOCHIRY’s 10.12kWh solar wall battery is rated at over 10kW.
When considering which house solar battery is right for your home and usage pattern, it is important to look at the power consumption of the appliance you plan to use the battery to back up. For example, a clothes dryer may consume more than 4kW of power when drying clothes. Your refrigerator, on the other hand, only consumes about 200 W. Knowing what you want to power, and for how long, is the best way to determine the size of your home battery system.
It’s worth noting that some lithium batteries can be stacked to increase their power output, while others simply increase the amount of energy you can store. For example, adding a second LG Chem RESU 10H to a standard configuration does not necessarily mean you now have 10kW of power; instead, you will need to add a separate inverter to increase the output capacity of the entire system. However, with other batteries, the power output increases as you install additional batteries: for example, a system with two HOCHIRY Powerwall batteries will give you 20 kW of power, twice as much as a single battery.
Not all types of appliances are the same, and all types of power needs are different. In your home, you have some appliances and devices that require a constant amount of power to run every time they are plugged in or turned on; for example, your refrigerator or WIFI modem. However, other appliances require more energy to start up, or even turn on, and then run again, with a more constant energy demand thereafter; for example, a heat pump or gas heat system.
This is the difference between peak (or startup) power and rated (or constant) power: peak power is the amount of energy a battery can provide in a very short period of time to turn on some appliance that consumes more energy.
After the initial surge, most of these power-hungry loads and appliances return to a level of energy demand that easily falls within the limits of a battery But keep in mind that running your heat pump or dryer will deplete your stored energy faster than if you simply want to keep the lights, WiFi and TV on.
To give you an idea of the performance of the leading lithium batteries on the PV market, here is a comparison of the peak and rated power of the most popular home lithium battery models.
As you can see, the HOCHIRY battery is on par with the BYD, but the HOCHIRY battery has 10kW of continuous power, which is outstanding among these batteries, and also delivers 15kW of peak power, which it can deliver for three seconds, and these numbers show that the HOCHIRY battery is very reliable!
We hope this article has cleared up your confusion about the difference between peak power and rated power. If you would like to know more about lithium batteries, or if you are ready to become a distributor of house solar batteries, please contact us.
“We started using HOCHIRY because they had a solid reputation and track record of supplying energy storage systems for a wide array of applications. Since using them, we’ve found that they are extremely reliable and the company’s customer service is unmatched. Our priority is being confident that our customers can rely on the systems we install, and using HOCHIRY batteries has helped us achieve that. Their responsive customer service teams allow us to provide the exceptional service to our clients that we pride ourselves on, and they are often the most competitively priced on the market. HOCHIRY also offers a variety of capacities, which is helpful to our customers who often have varying needs, depending on if they are intending to power small systems or full-time systems.”
“Most of our customers require either a 48V Rack Mount Lithium Battery or 48V Wall Mounted Lithium Battery, so our biggest sellers are the B-LFP48-100, B-LFP48-130, B-LFP48-160, B-LFP48-200, LFP48-100PW, and B-LFP48-200PW batteries. These options provide the best support for solar-plus-storage systems because of their capacity – they have up to 50 percent more capacity and last much longer than lead acid options.
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