How to visualize battery data

February 1, 2021

A Q&A with Peaxy Product Design Director Stefan Geens.

Data visualization has a number of applications in business, but can you talk about the practical ways it becomes important when working with battery data specifically?

Visualizations can instantly bring to life the insights that data tables struggle to express, but only if the charts fit the context. Before we deploy a chart, we always make sure it fits the needs of the use case, and that the needs in turn determine the charting solution we employ.

When monitoring industrial batteries deployed at a site, operating conditions and performance indicators should be similar for all energy blocks on a site, and all strings in a block. If discrepancies occur, you want to investigate immediately. That’s only possible by viewing charts that provide live visualizations at every level of the hierarchy.

When dealing with large datasets, it’s often difficult to see potential red flags or anomalies. What are some strategies that can be used to easily drill down into a vast amount of data?

The ability to drill down into the data is crucial, not only because trends may be difficult to identify and remedy at a macro level, but also due to the practical limitations of web browsers to present large amounts of data at once. It’s important to be able to drill down at a variety of levels, all of which map to real-life battery configurations. Notice one block is discharging faster than others? You can easily zoom in on that block and see the relevant details instantly. Notice one of the block’s strings is under voltage? Zoom in on that string for a full view of what’s happening. At every level in the battery grid configuration, dynamic charts let you synchronize any number of attributes to the same live timeline, so that discrepancies between subcomponents or correlations between attributes literally jump out at you.


See emerging trends or anomalies in live data with dynamic charts


What are some of the challenges of dealing with historical data?

When analyzing historical data to satisfy reporting obligations or monitor warranty regimes, millions of granular data points per 24-hour cycle need to be conveyed accurately on a chart, and that’s a big challenge. Conventional decimation techniques can miss brief voltage spikes, so instead we periodically run data pipelines that incorporate every data point, no matter how anomalous or fleeting, into the plot. Since the primary goal is archival accuracy that can meet regulatory obligations, these static charts are pre-rendered daily, once the cycle is completed.


Create automated operational reports on full-screen resolution datasets with static plots


How important is it to allow the end user of the software to define and design their own visualizations? What kind of benefits does that offer?

For modern, cloud-based solutions, you must have the upfront configuration tools that allow you to perform deep analysis without needing to involve a programmer or write a single line of code. For example, before you can train a regression analysis algorithm on historical data to generate performance predictions from live data, it’s important to get a feel for how the various features correlate, so that the dataset can be culled of any superfluous attributes. To this end, our self-service tool PLI Machine Learning Manager employs three complementary point-and-click charting tools:

 

  • heat map places all features on the grid — both numerical and categorical — to present an overarching view.
  • The correlogram zooms in on a user-selected subset of numerical features, constructing confidence ellipses for each combination.
  • And finally, a detailed plotter lets the user deep dive into the distribution correlation of up to three features of any type.


Visualize statistical correlations to seed machine learning algorithms

This four minute video walks through some useful examples of how PLI Machine Learning Manager takes advantage of data visualizations, in this case to support feature engineering and the seeding of algorithms that are used to power the analytics. Click below to watch.

At Peaxy, we provide full access to all battery data threaded by serial number, over the lifecycle of the asset, including dynamic RUL and degradation computations by serialized battery asset. We also have experience with computing near-real-time digital twins for each serialized battery, over the life of the battery.

Our deployments are typically done in 120 days, often with far more speed and efficiency than an in-house development effort or a generalized analytics platform with extensive customizations.

Want to know more?

Contact us to learn more about Peaxy Lifecycle Intelligence for Batteries.