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Lead acid battery monitoring for inverters

Posted: 22 Oct 2014 ?? ?Print Version ?Bookmark and Share

Keywords:DC-AC Inverter? battery? SoC monitors? bq34z110? impedance track?

A power back-up DC-AC inverter is an example of a widespread application that at present does not have an easy, accurate and automated method of monitoring and reporting battery condition. How long will the battery retain its life? When will we need to replace the battery? Such questions remain unanswered. A battery monitor with an ability to report battery status accurately will definitely enhance the end-user experience.

Remaining Battery Capacity changes when the battery is charged or discharged. By comparing remaining capacity to Full Charge Capacity (FCC), SoC monitors the current state of the battery. As the battery ages, chemical degradation causes reduction in the battery's maximum chemical capacity. By comparing FCC at 25 C to the battery design capacity, SoH monitors the effect of battery aging.

The bq34z110 uses the impedance track technique to accurately predict a battery's SoC and SoH. Using this device helps extend battery lifetime by giving us relevant information that compensates for the battery temperature, aging, self-discharge, discharge rate, and their effect on the battery impedance.

View the PDF document for more information.

Originally published by Texas Instruments Inc. at as "Lead acid battery monitoring implementation for inverters using bq34z110".

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