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Principle Battery System Batteries-
How flywheel batteries work
Flywheel energy storage stores kinetic energy by spinning a rotor at high speeds, offering rapid energy release, enhancing grid stability, supporting renewables, and reducing energy costs.
FAQs about How flywheel batteries work
How does Flywheel energy storage work?
Flywheel energy storage (FES) works by accelerating a rotor (flywheel) to a very high speed and maintaining the energy in the system as rotational energy.
How does a flywheel create kinetic energy?
To create kinetic energy, the motor derives energy from the electric grid to power the cylinder or disk to spin at a rate of up to 60,000 RPM. Because a flywheel must be accelerated by an external force before it will store energy, it is considered a “dynamic” storage system.
Can a flywheel replace a lead-acid battery?
As the flywheel spins faster, it experiences greater force and thus stores more energy. Flywheels are thus showing immense promise in the field of energy storage systems designed to replace the typical lead-acid batteries. For a flywheel, kinetic energy is calculated as for a spinning object, as
How does a flywheel rotor work?
Electrical inputs spin the flywheel rotor and keep it spinning until called upon to release the stored energy. The amount of energy available and its duration is controlled by the mass and speed of the flywheel. In a rotating flywheel, kinetic energy is a function of the flywheel's rotational speed and the mass momentum of inertia.
How can flywheel energy storage improve battery life & system availability?
To improve battery life and system availability, flywheels can be combined with batteries to extend battery run time and reduce the number of yearly battery discharges that reduce battery life (Figure 2). Many types of medical imaging equipment, such as CT or MRI machines can also benefit from flywheel energy storage systems.
What is the difference between a flywheel and a battery?
The physical arrangement of batteries can be designed to match a wide variety of configurations, whereas a flywheel at a minimum must occupy a certain area and volume, because the energy it stores is proportional to its rotational inertia and to the square of its rotational speed.
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How many batteries can a solar container battery cabinet hold at most
For most residential and small commercial users, a 10–20 kWh containerized unit offers the optimal balance of capacity, footprint, and cost efficiency. The container system is equipped with 2 HVACs the middle area is the cold zone, the two side area near the door are hot zone. 40 foot Container can Installed 2MW/4. 58MWh We will configure total 8 battery rack and 4 transformer 500kW per. Need to integrate a back panel with a charge controller and a battery? We can design, build, and integrate a complete system for your solar battery enclosure! Take the guesswork out of your solar system and let us put together the perfect solution for you. Ameresco Solar supplies and distributes a. PKNERGY 1MWh Battery Energy Solar System is a highly integrated, large-scale all-in-one container energy storage system. Common configurations can include systems with anywhere from a few batteries to hundreds or even thousands, 3.
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How does the battery management system work
A battery management system (BMS) is any electronic system that manages a rechargeable battery (cell or battery pack) by facilitating the safe usage and a long life of the battery in practical scenarios while monitoring and estimating its various states (such as state of health and state of charge), calculating secondary. MonitorA BMS may monitor the state of the battery as represented by various items, such as: • : total voltage, voltages of individual cells, or. BMS technology varies in complexity and performance: • Simple passive regulators achieve balancing across batteries or cells by bypassing the charging current when the cell's voltage reaches a certain level. The cell voltage is a poor. • • • • •,, September 2014.
FAQs about How does the battery management system work
How does a battery management system (BMS) work?
A BMS may monitor the state of the battery as represented by various items, such as: The BMS will also control the recharging of the battery by redirecting the recovered energy (i.e., from regenerative braking) back into the battery pack (typically composed of a number of battery modules, each composed of a number of cells).
How do battery management systems work?
Battery management system (BMS) is technology dedicated to the oversight of a battery pack, which is an assembly of battery cells, electrically organized in a row x column matrix configuration to enable delivery of targeted range of voltage and current for a duration of time against expected load scenarios.
What is a battery energy management system?
A battery energy management system is a device or set of devices that monitors, regulates, and optimizes the performance of a battery pack. It ensures that the cells in the pack are operating within their safe limits, prolongs the life of the pack, and maximizes its overall efficiency. The main components of a BMS are:
What is a centralized battery management system (BMS)?
Centralized BMS: One control unit monitors all the cells in a battery pack. It is commonly used in smaller applications but may struggle with scalability in larger battery packs. Modular BMS: Each module in the battery pack has its own BMS. This system is used for mid-sized applications, providing both scalability and flexibility.
Do you need a battery management system?
They do, however, have a reputation of occasionally bursting and burning all that energy should they experience excessive stress. This is why they often require battery management systems (BMSs) to keep them under control. In this article, we'll discuss the basics of the BMS concept and go over a few foundational parts that make up the typical BMS.
How a battery management system improves the performance of an electric vehicle?
A BMS will also improve the performance of an electric vehicle by optimizing the charge/discharge cycles of the battery pack to prolong its life span. The battery management system is a great invention that helps to keep batteries in good condition and prolongs their life.
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How to maintain lithium iron phosphate energy storage battery
Learn how to maintain your LiFePO4 energy storage battery with tips on charging, storage, balancing, and temperature control for long-lasting performance.
FAQs about How to maintain lithium iron phosphate energy storage battery
Why is proper storage important for LiFePO4 batteries?
Proper storage is crucial for ensuring the longevity of LiFePO4 batteries and preventing potential hazards. Lithium iron phosphate batteries have become increasingly popular due to their high energy density, lightweight design, and eco-friendliness compared to conventional lead-acid batteries.
Why are lithium iron phosphate batteries so popular?
Lithium iron phosphate batteries have become increasingly popular due to their high energy density, lightweight design, and eco-friendliness compared to conventional lead-acid batteries. However, to optimize their benefits, it is essential to understand how to store them correctly.
How do you store a LiFePO4 battery?
4. Storage: If you need to store LiFePO4 batteries for an extended period, follow these guidelines: a. Charge the battery to around 60-70% of its capacity before storage. b. Store the battery in a cool, dry place away from direct sunlight, moisture, and flammable materials.
Does a LiFePO4 lithium-ion battery need maintenance?
The main reason a LiFePO4 lithium-ion battery requires virtually no maintenance is thanks to its internal chemistries. A LiFePO4 lithium-ion battery uses iron phosphate as the cathode material, which is safe and poses no risks. Additionally, there is no requirement for electrolyte top-up, as in the case of traditional lead acid batteries.
Do lithium based batteries need maintenance?
All lithium-based batteries provide current due to the movement of lithium ions. However, their maintenance requirements differ drastically. Among the various lithium battery technologies, LiFePO4 is the easiest to maintain. However, as any expert will tell you, even the most robust battery needs some maintenance.
Do you need to charge a LiFePO4 battery before storage?
It is not necessary to charge a LiFePO4 battery fully before storage, as storing a battery at 100% charge for a long period can damage the battery's health. It is recommended to charge the battery up to 50% capacity before storage. 4.3 How Long Can a LiFePO4 Battery Last in Storage?
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How much does an solar container outdoor power plus a battery cabinet cost
Each system, including 5 kW panels, a 10 kWh lithium battery bank, and real-time remote monitoring, cost around USD $25,000, including shipping and installation. Let's talk about actual prices. Here are standard ballpark estimates (in USD):However, prices aren't always simple—they vary depending on size, materials, certifications, and location. Let's break down what really goes into the cost and whether it's worth your money. The final cost of a solar container system is more than putting panels in a box. This is what you're really. Our 20 and 40 foot shipping containers are outfitted with roof mounted solar power on the outside, and on the inside, a rugged inverter with power ready battery bank.
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Battery heating work
Battery heating systems work by using an external source of heat to warm the battery. This can be done through a variety of methods, including electric resistance heating and heat pumps.
FAQs about Battery heating work
How do thermal batteries work?
Optimising renewables Our thermal batteries support the electrification of heat. They work with heat pumps, wind and solar, grid and microgrid electricity, waste heat, combined heat and power (CHP) and boilers. And store 4 to 10 times more energy than conventional materials.
Why do EV batteries need to be heated?
Faster Charging: Preheated batteries accept charge more readily, reducing charging times. Reduced Battery Degradation: By preventing extreme temperature fluctuations, battery warming can help extend the overall lifespan of your EV's battery.
How long does battery heating take?
The effects of different time durations are also examined. The results show that the proposed battery heating strategy can heat the tested battery from -20 °C to above 0 °C in less than 5 minutes without incurring negative impact on battery health and a small current duration is beneficial to reducing the heating time.
How do car battery heaters work?
Car battery heaters typically come in two main types: electric blankets and heating pads. Both types operate on the same principle – they use electricity to generate heat, which is then transferred to the battery. Here's a quick breakdown of the two: Electric Blankets: These are wrapped around the battery and plugged into a power source.
What is a thermal battery?
Our thermal batteries support the electrification of heat. They work with heat pumps, wind and solar, grid and microgrid electricity, waste heat, combined heat and power (CHP) and boilers. And store 4 to 10 times more energy than conventional materials. Sustained with Plentigrade
Can battery heating reduce battery health?
The results show that the proposed battery heating strategy can heat the tested battery from about -20 °C to 0 °C in less than 5 minutes without a negative impact on battery health and the decreased current duration is beneficial to reducing the heating time.
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How much does the new upgraded lead-acid battery cost
The Powervault battery is compatible with all solar PV systems. The product range includes a choice of the lower cost Lead Acid battery or the more costly but longer lasting Lithium-ion Phosphate battery. The company claim that a homeowners could lower their electricity bills by as much as 20% with a Powervault system. Powervault's latest range of solar batteries includes the Powervault 3 and Powervault 3eco. The difference between them is that the Powervault 3 uses high-performance Lithium-polymer (Li-MNC) cells while the Powervault 3eco model. Octopus Energy:The Agile Tariff from Octopus Energy is a half-hourly settled tariff thats pricing is based upon wholesale energy prices. Powervault. Whether it's a Powervault solar battery you're interested in or you've another manufacturer in mind the best way to save money on the installation. As well as the battery itself, you can also purchase a chassis which will allow you to increase the battery size in the future. You can also purchase additional battery packs for the Powervault 3 to increase capacity.
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What is the name of the battery installation work for a communication base station
Telecom batteries for base stations are backup power systems using valve-regulated lead-acid (VRLA) or lithium-ion batteries. They ensure uninterrupted connectivity during grid failures by storing energy and discharging it when needed. Our V series battery pack is designed to provide safe, high-performance energy storage solutions for a variety of applications. It is widely applied in residential, small commercial and industrial area for energy purpose. Appearance Shanghai Pytes Energy Co. Page 19 There are RS-232C, RS485 and CAN. Installing a Base Transceiver Station (BTS) is a critical step in building mobile communication networks. In case of fire, please use fire extinguisher.
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How much is the price of lithium-ion batteries for 4g solar container communication stations
Lithium batteries that store surplus solar energy, typically cost between $6800 and $10,700, excluding installation costs. The backup energy will also reduce your dependency on the. Through years of dynamic development, PYTES has set up several manufacturing bases and sales centers domestically in Shanghai, Shandong, Jiangsu and overseas in Vietnam, USA and Netherlands, covering multiple areas including solar energy storage system, packs for two-wheelers, cylindrical. How much does a lithium-ion battery cost in 2024? It costs around $139 per kWh. Understanding the lithium battery cost dynamics is important for manufacturers, investors, and consumers alike to make wise capital decisions. Prices range from $10 to $20,000 based on use. Costs depend on device type and various market factors like demand and supply trends. Lithium. 12V 12Ah LiFePO4 Deep Cycle Battery, 2000+ Cycles Lithium Iron Phosphate Rech. SineSunEnergy always pursues better quality and higher technology products, we can provide a full.
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How much current does a 80A battery discharge
Note: Use our solar battery charge time calculatorto find out the battery charge time using solar panels. If the C-rating is mentioned as C/n (any number), in this case, C = 1. (E.g, C/2 = 1/2 = 0.5C). 1. C/2 = 0.5C 2. C/. Generally, you will find the battery c rate on battery label or on the specs sheet of your battery. As you can see, the battery c rating is mentioned as "max. charge current" and "max. discharge current". Converting the C rate of your battery into amps will give you the recommended charge and discharge current (amps). Formula: Battery charge and discharge rate in amps = Battery capacity (Ah) × C-rate Converting the C rate of your battery to time will let you know your battery's recommended charge and discharge time. Formula: C-rate in time (hours) = 1 ÷ C-rate Formula: C-rate in time (minutes) = (1 ÷ C-rate) × 60. The chemistry of battery will determine the battery charge and discharge rate. For example, normally lead-acid batteries are designed to be charged and discharged in 20 hours. On the other hand, lithium-ion batteries can be.
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FAQs about How much current does a 80A battery discharge
What is an example of a battery discharge rate?
For example, if a battery has a capacity of 3 amp-hours and can be discharged in 1 hour, its discharge rate would be 3 amps. The battery discharge rate is the amount of current that a battery can provide in a given time.
What is a typical AA battery discharge rate?
The discharge rate is usually expressed in terms of amperes (A) or milliamperes (mA). For example, a common AA battery has a discharge rate of about 2.4 A. That means that it can provide 2.4 A of current for one hour, or 1.2 A for two hours before it needs to be recharged.
How do you calculate battery discharge rate?
The faster a battery can discharge, the higher its discharge rate. To calculate a battery's discharge rate, simply divide the battery's capacity (measured in amp-hours) by its discharge time (measured in hours). For example, if a battery has a capacity of 3 amp-hours and can be discharged in 1 hour, its discharge rate would be 3 amps.
How long does a 50Ah battery last?
For example, a 50Ah battery can deliver a current of 1 amp for 50 hours or 5 amps for 10 hours. How long does it take to fully charge a 200Ah battery? 5 hours, assuming that you have a 12 V 200 Ah car battery and a charging rate is 0.2C. To find it: Calculate the runtime to full capacity using t = 1/C: t = 1/0.2 = 5 hours or 300 minutes.
How many watts a battery can be discharged in one hour?
2 batteries of 1000 mAh,1.5 V in series will have a global voltage of 3V and a current of 1000 mA if they are discharged in one hour. Capacity in Ampere-hour of the system will be 1000 mAh (in a 3 V system). In Wh it will give 3V*1A = 3 Wh
Can a battery discharge with 2 a?
Note that the highest discharge current that is mentioned is 1000 mA = 1 A. That does not mean you cannot discharge with 2 A but realize that the battery's capacity will be less at such a high current. You will get less energy out of the battery compared to a more realistic discharge current of for example 100 mA.
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How long does it take to charge and discharge the battery cabinet
This calculator enables you to accurately estimate the charging time and duration of battery discharge based on various parameters like battery capacity, current, and efficiency. This calculator is especially useful for people who use rechargeable batteries in devices like electric vehicles, power banks, or any electronic. The capacity of a battery or accumulator is the amount of energy stored according to specific temperature, charge and discharge current value and time of charge or discharge. If not, the battery breaker may be tripped due to overtemperature protection. This article explores the science of lithium-ion charging, the engineering logic behind battery charging.
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How to connect the output line of lead-acid battery
The basic concept when connecting in series is that you add the voltages of the batteries together, but the amp hour capacity remains the same. As in the diagram above, two 6 volt 4.5 ah batteries wired in series are capable of providing 12 volts (6 volts + 6 volts) and 4.5 amp hours. This is where most tutorials end, but. In theory, a 6 volt 5 Ah battery and a 12 volt 5 Ah battery connected in series will give a supply of 18 volts (6 volts + 12 volts) and 5 Ah. A 6 volt battery is often three 2 volt cells and a 12 volt battery is usually six 2 volt cells. In theory a 6 volt 3 Ah battery and a 6 volt 5 Ah battery connected in series would give a supply of 12 volts 3 Ah(the capacity of the weaker battery always restricts the circuit) and if you did so it. When connecting batteries in series, the general advice is to use batteries of the same ratings and the same make and model in order to minimize differences in exact voltage and. As covered in the section Connecting batteries of different voltages in seriesabove, the greater the differences in either voltage or amp hour rating, the more the discharging and recharging is unbalanced and the more.
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FAQs about How to connect the output line of lead-acid battery
How do I connect a lead acid battery?
There are three ways to connect your lead acid batteries—parallel, series, and a combination known as series/parallel. We cover each of these battery configurations in greater detail in our Battery Basics tutorial section of the site should you want to delve in a little deeper or reinforce what you already know.
Should a lead acid battery be positive or negative?
Safety Rule #2 -- When Installing a Battery Start with the Positive There is a serious amount of stored potential energy available in a sealed lead acid battery. A shorted car battery, for example, can deliver several hundred amps in the blink of an eye. To put that in perspective that is more than an arc-welding machine.
What happens if you recharge a lead acid battery?
Check your battery chemistries – Sealed Lead Acid batteries for example have different charge points than flooded lead acid units. This means that if recharging the two together, some batteries will never fully charge. The result here would be sulfation of those that never reach a full state of charge, reducing their lifespan.
How do you wire a battery in series?
For more information on wiring in series see Connecting batteries in series, or our article on building battery banks. The basic concept is that when connecting in parallel, you add the amp hour ratings of the batteries together, but the voltage remains the same. For example:
Can a 12V battery be connected in series?
When creating a lead-acid battery bank with a higher voltage, like 24 or 48V you will need to connect multiple 12V batteries in series. But there is one problem with connecting batteries in series, and this is that batteries are not electrically identical. They have slight differences in internal resistance.
How do you wire a battery together?
There are two ways to wire batteries together, parallel and series. The illustrations below show how these set wiring variations can produce different voltage and amp hour outputs. In the graphics we've used sealed lead acid batteries but the concepts of how units are connected is true of all battery types.
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How to calculate the current in a rechargeable battery
The charging current can be determined using the formula I=C/t, where II is the current in amps, C is the battery capacity in amp-hours, and tt is the desired charge time in hours.
FAQs about How to calculate the current in a rechargeable battery
What is the battery charge calculator?
The Battery Charge Calculator is designed to estimate the time required to fully charge a battery based on its capacity, the charging current, and the efficiency of the charging process. This tool is invaluable for users who rely on battery-operated devices, whether for personal use, industrial applications, or renewable energy systems.
How to calculate battery charging time?
Charging Time of Battery = Battery Ah ÷ Charging Current T = Ah ÷ A and Required Charging Current for battery = Battery Ah x 10% A = Ah x 10% Where, T = Time in hrs. Example: Calculate the suitable charging current in Amps and the needed charging time in hrs for a 12V, 120Ah battery. Solution: Battery Charging Current:
How do you calculate a battery charge level?
Charger Current (A): The charger's output current is typically measured in Amps (A) or milliamps (mA). To consider the current charge level, we multiply the battery capacity by the uncharged percentage. Effective Capacity (Ah) = Battery Capacity (Ah) × (1−Charge Level/100) Let's say you have:
How do you calculate battery capacity?
When the capacity of the battery pack is in amp-hours (Ah), we'll divide by charger current in amps (A): charge time (h) = battery capacity (Ah) ÷ charger current (A) When the capacity is in milliamp-hours (mAh), we'll divide by charger current in milliamps (mA): charge time (h) = battery capacity (mAh) ÷ charger current (mA)
What is the charge current of a battery?
The charge current depends upon the technology and capacity of the battery being charged. For example, the current that should be applied to recharge a 12 V car battery will be very different from the current for a mobile phone battery. A primary battery is one that can convert its chemicals into electricity only once and then must be discarded.
How do I use charge current?
Enter the battery charger current or wattage in the appropriate field. Choose the appropriate charge current unit from the options to the right of the charge current input field. When working with charge current, you can choose either mA or A, depending on the charging current unit stated on the charger.
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How much does a 1kWh lithium battery cost for energy storage in Togo
Lithium-ion (NMC/LFP) utility-scale systems: $0. 35/kWh, depending on duration, cycle frequency, electricity prices, and financing costs. 506/kWh for 1MW/2-hour setups. In 2025, the typical cost of a commercial lithium battery energy storage system, which includes the battery, battery management system (BMS), inverter (PCS), and installation, is in the following range: $280 - $580 per kWh (installed cost), though of course this will vary from region to region. TL;DR: Wholesale lithium-ion pack prices averaged about $0. 115/Wh globally in 2024 (down ~20% YoY), but finished consumer systems (portable power stations) retail much higher due to inverters, BMS, certifications, and margins. In 2025, real retail prices for 1 kWh-class LFP units commonly land. The average battery cost per kWh in 2025 is approximately $120, with variations depending on technology, scale, and market demand. As the global shift toward electrification accelerates, battery technology plays a pivotal role in shaping the future of energy. * For commercial use only Access limited to Free Statistics. Premium Statistics are not included.
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How to maintain the battery so that it does not heat up
10 keys to keeping your laptop battery in good conditionMove your battery away from heat. Keep your battery between 20% and 80% charge. Prioritise working with the computer plugged in.
FAQs about How to maintain the battery so that it does not heat up
How do you store a battery if not in use?
When not in use, batteries require proper storage and handling to maintain their health and performance. Here are some tips to keep in mind: Avoid storing batteries in hot, humid environments, as this can cause chemical reactions that reduce capacity and increase self-discharge rates. Store batteries in:
How do I Keep my battery healthy?
To keep your batteries healthy, it's essential to monitor their performance and health regularly. Here are some ways to do so: Invest in a high-quality battery tester that can provide accurate readings of your battery's voltage, capacity, and internal resistance. Use battery testing equipment to:
How does temperature affect battery life?
For most batteries, it's ideal to charge them before they drop below 20% and unplug them once they reach around 80-90%. This reduces strain on the battery and extends its lifespan. Part 3. How does temperature impact battery life? Temperature plays a critical role in battery performance and longevity. Here's how: 1. Avoid extreme heat
How to keep a laptop battery healthy?
Partial charging and discharging can help prolong the battery's lifespan. If possible, aim to keep your battery within the 20% to 80% charge range. This range is considered optimal for battery health. Regularly using your battery instead of keeping your laptop plugged in constantly can help exercise the battery and maintain its capacity.
How does temperature affect a laptop battery?
Extreme temperatures can have a significant impact on your laptop battery's health and longevity. High temperatures: such as leaving it in a hot car or near direct sunlight. Low temperatures: like leaving it in a freezing car or a chilly environment. For optimal battery health, strive to keep your laptop in a:
Do laptop batteries wear out over time?
All batteries wear out over time, but they don't wear out at the same speed. You and someone else, given the same brand-new laptop on the same day, could have quite different battery life after two years—maybe as much as a 40 percent difference. It depends on charging levels, heat, how you store it, and avoiding the deadly zero-charge.
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How to identify the battery of solar energy storage cabinet
This guide aims to walk you through the essential considerations when selecting energy storage cabinets, ensuring you find a solution that perfectly aligns with your needs. Whether you're managing a solar farm or securing power for a manufacturing facility. medium-sized energy storage power plants of the number of interconnected cabinets. The battery cabinet is design d to hold the batteries listed in Table 1. Operating Ambient Temperature Range: -40 °C to +65 °C. Short-circuiting the battery may result in a risk of electric shock or fire and can lead to severe injury or death and/or permanent damage to the unit and s on or around the cabinet.
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How long can a strong light battery last
The duration of a battery powering a strong light depends on factors such as battery capacity, light power consumption, and battery type1234. Battery types: Lead-acid lasts around 3-5 years, while nickel-cadmium can reach up to 10 years with proper maintenance3. AA, AAA, or C-size batteries: Depending on quality, they may last from a few hours to several days2.
FAQs about How long can a strong light battery last
How long do batteries last in LED lights?
Considering battery capacity of 2.5 Ah with a led light load of 3W and battery voltage of 1.5V, an AA battery last for 1.25 hrs while an AAA battery with 1.2 Ah lasts for 0.60 hrs. The battery life will change depending upon load, voltage & battery types.
How long do fairy string lights last?
Considering battery capacity of 2.5 Ah with a led light load of 3W and battery voltage of 1.5V, an AA battery last for 1.25 hrs while an AAA battery with 1.2 Ah lasts for 0.60 hrs. The battery life will change depending upon load, voltage & battery types. I like battery-powered fairy string lights because you can use them outside.
How long does a lithium ion battery last?
Lithium-Ion Batteries: Cycle life: Often good for 300-500 full charge cycles, which can translate to several years of use. In high-drain LED devices: Can last anywhere from a few hours to several days, depending on capacity and usage. Shelf life: Can retain up to 80% of their charge after a year in storage. NiMH Batteries:
How long does a battery last?
So, the battery will last approximately 5 hours under these conditions. Battery runtime refers to the duration a battery can power devices before needing a recharge. This concept is crucial in scenarios where consistent power supply is essential, such as in emergency systems, renewable energy storage, and mobile applications.
How long will a 12V battery last?
A 12v battery will last anywhere between 5-20 hours while running a load. how long will a 24v battery last? Here's a chart on how long will a 24v different capacity lead acid and lithium (LiFePO4) battery will last running a 100 watts of AC load. Table 2: how long will 24v battery last?
How to calculate battery life of LED lights?
You have to start by identifying the amp-hours of the batteries. Multiplying the amp-hours by the volts gives you the watt-hours. Dividing the watt-hours by the total wattage of the LED lights will give you battery life.