The industry is still determining the most accurate way to report on battery systemsĪnd their costs-and the public is still learning how to interpret those reports.Battery system as a vital part in the Electrical Vehicles (EVs) needs accurate and efficient battery model to predict and optimize battery performance especially under different runtime operations. Of battery systems makes an apples-to-apples comparison more problematic. (or by their life-cycle cost of energy in $/kWh), the different power-to-energy ratios While PV systems may be compared by their capital cost in $/kW With different power-to-energy ratios helps a person realize why it's difficult toĬompare the costs of two battery systems even when they use identical chemistries Understanding that battery systems are designed Knowing the power-to-energy ratio of a battery system provides a better understanding (MW) to provide quick-responding frequency regulation in the PJM market. (MWh) to avoid curtailment of renewable generation, to systems with higher power ratings Of grid-scale energy storage shifted from a focus on systems with high energy ratings If a battery system will be used primarily to provide peak-shifting or must provideīackup power in case of a grid outage, the battery needs to be able to discharge overĪ longer period (e.g., 2 – 5 hours) and is designed with a higher energy rating.Īs reported by Green Tech Media in its Q3 2015 Energy Storage Monitor, deployment If the battery system will be used primarily to provide frequency regulation, theīattery system needs to charge and discharge many times over short durations of time.Ī system used in this type of scenario will be designed with a higher power rating. In the PJM Interconnection, some behind-the-meter battery system operatorsīid to provide frequency regulation and are compensated for providing this grid service.ĭifferent end uses call for different energy-to-power ratios. Use batteries to reduce utility demand charges as well as energy charges through peak Value streams to realize shorter payback periods. To maximize either the power rating or the energy rating, depending on their intendedĪs discussed in an earlier blog post, battery-system owners may tap into multiple The important difference is that, unlike the PV system, battery systems are designed Similar to the energy output of a PV system over time (which is also measured in kWh). The energy rating is the measure of how much electricity the system can deliver or absorb over the course of an hour. The energy rating, or battery capacity, of the battery system is measured in kilowatt-hours and provides an estimate of theĪmount of energy that can be stored. Mistake is to use the term capacity when referring to the kilowatt rating of the battery system. Rating of a PV system (also measured in kilowatts), which indicates how much powerĬan theoretically come out of the PV system in any given instant. The power-to-energy ratio that is, to fully understand the capabilities of a particularīattery system, one must know both the kilowatt rating and the kilowatt-hour rating.įor batteries, the power rating (measured in kilowatts) indicates how much power canįlow into or out of the battery in any given instant. When describingĪ battery system (whether or not it's attached to PV panels), it's necessary to indicate Translating their understanding of PV systems to battery systems. World are at risk of misinterpreting the significance of these ratings by directly PV-savvy consumers who are new to the energy-storage The specifications of a battery system generally provide a kilowatt (kW) rating as PV is applicable, batteries offer new concepts to master. Learning the lingo of yet another energy technology. Home energy storage options from different manufacturers, consumers are faced with With the price of batteries falling, the emergence of Tesla’s Powerwall, and other Homeowners may be confident explaining their 5-kilowatt system produces about 7,000 Know the difference between the rated capacity of the system (expressed in kilowatts) and the amount of electricity that the system actually produces (expressed in kilowatt-hours). Even if most peopleĭon't have a thorough understanding of how it works, homeowners with a PV system may Read part one of the series.Īs solar and other renewable energy technologies become more mainstream, the publicīecomes more familiar with the language of photovoltaics (PV). This series explains more about batteries and the power-to-energy ratios. Batteries 101 Series: How to Talk About Batteries and Power-To-Energy Ratios
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