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Simple MPPT-based lead acid charger using bq203

Posted: 10 Feb 2010     Print Version  Bookmark and Share

Keywords:acid charger  bq203 charger  battery charger 

This application note is intended for users designing an MPPT-based lead acid battery charger with the bq2031 battery charger. This report contains a design for charging a 12A-hr lead acid battery using MPPT (maximum power point tracking) for maximizing charging efficiency for solar applications.

The simplest method of charging a battery from a solar panel is to connect the battery directly to the panel, but this is not the most efficient method. Suppose the panel has a rating of 75W and produces a current of 4.65A with a voltage of 16V at standard test conditions of 25°C temperature and 1000 W/m2 of insolation. The lead acid battery has a voltage of 12V; directly connecting the panel to this battery reduces the panel voltage to 12V and only 55.8W (12V and 4.65A) can be extracted from the panel for charging. A DC/DC converter is required for efficient charging. This application report describes a design using the bq2031 for efficient charging.

View the PDF document for more information.





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