Industry Case Study

Battery SOH Testing at ESS Companies


Fluence OS monitors the battery’s SOH in real time through its Fluence IQ platform. Although not explicitly stated, there is indication that Powin Energy’s StackOS can monitor battery SOH. Notably, the companies do not divulge much information on whether or how they measure battery SOH. Below is an explanation of the findings, as well as an explanation of the methodology used.


  • Fluence recently released its 6th generation three-component technology stack comprising Fluence (Operating System) OS, Fluence IQ, and Fluence Cube. Fluence Cube is the hardware component of the system.
  • Fluence OS (the platform) combines asset management, comprehensive controls, and system visibility to “manage storage system operations according to preset modes and access real-time information through multiple system views, including control view, plant view, and fleet view.” Fluence OS can monitor and analyze a span of “system limits, including cell, BMS and PCS voltage, temperature, SOC, SOH, humidity,” among others.
  • The platform achieves this by leveraging Fluence IQ (the software), which “tracks all relevant system operation data to allow for management of battery degradation, more in-depth system decision-making, reduced operating cost and optimized energy market dispatching.” Fluence IQ reports performance by monitoring “system availability, state of health, discharge cycles, and more.”

Nidec ASI

  • Although Nidec discusses its various battery energy storage solutions on its website, there is nothing on its battery SOH testing or determination. However, a case study of the company states that it developed “smart state of charge (SOC) and state of health (SOH) management through algorithm to optimize performance of the system.” No further information on the subject is available.


  • RES does not provide much information about its energy storage solutions, but instead requests prospective customers to contact customer care for more information. This would be because the company is integrated, i.e. offers various solutions other than ESS. None of the press releases or media features had any relevant information.

Powin Energy

  • In 2016, Powin Energy received a U.S. patent for its “Battery Pack Operating System(bp-OS)” that utilized a proprietary algorithm to deliver “unprecedented visibility into battery health through real-time battery monitoring, state-of-charge management, and detailed diagnostics.”
  • The bp-OS is also referred to as StackOS, and it now features a “Battery Management System” (BMS) that “evenly synchronizes the voltage of every single battery cell through active and passive balancing to optimize charge and discharge cycles for battery cells.” StackOS is also suited with Powin Energy’s proprietary ‘Battery Odometer’ that “measures battery capacity degradation and remaining battery lifetime while recording all aspects of battery usage.”
  • Although not explicitly stated, there is indication that Powin Energy’s StackOS can monitor battery SOH, based on the available details. This is because battery SOH is defined as the measure of the battery’s general condition including voltage, self-discharge, internal resistance, and charge acceptance,


  • Although AES discusses its Energy Storage solutions on its website, it does not provide much detail regarding specific services and/or products offered. There is also nothing on the technology used. Its press releases mainly discusses its activities and accomplishments.


  • LG CNS is widely integrated and its website does not have much on its energy storage systems. The available press releases relating to ESS are focused on the company’s contracts. Although the press releases and media reports mentioned that LG CNS uses an “Energy Management System (EMS),” there was no information from either the company or third-party resources to determine whether the technology is also used to monitor or test SOH.

NEC Energy Solutions

  • NEC Energy Solutions leverages its “proprietary AEROS® Controls Suite” to manage and monitor its energy storage solutions. Although the company mentions that the software monitors the state and condition of the battery systems, it is not clear whether this also includes the battery SOH.

NextEra Energy Resources

  • While NextEra Energy Resources explains how its battery storage solutions work, it does not provide much detail on any solutions that it might offer to monitor the batteries’ SOH. It also mentions that it has a BMS, but there are no details divulged on its operation and full functionality.

Doosan GridTech

  • Despite reviewing the features of Doosan GridTech’s ESS software, as well as other parts of its website and communications, there was no information on whether or how it measures the state of health (SOH) of the batteries. However, a paywalled market report indicated that it is among the companies that offer ESS software with the capability to measure battery SOH.

Glenn is the Lead Operations Research Analyst at Simple Manifestation with experience in research, statistical data analysis and interview techniques. A holder of degree in Economics. A true specialist in quantitative and qualitative research.

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