Arduino MPPT solar charger shield

20160119_projekte_028

Lukas Fässler made an MPPT solar charger project and wrote a post on his blog detailing its assembly:

The basic idea behind an MPPT solar charger is simple. A solar panel has a certain voltage (in the region of 17 to 18 volts for a 12 volts pannel, somwhat dependent on temperature) at which it provides most power. So as long as the battery needs charging, you want to pull just as much current to reach this voltage. But once the battery is full you need to avoid overcharging the battery. So you want to maintain a maximum voltage for your battery (somewhere around 13.8 volts for a 12 volt lead acid battery) and no longer care about the pannel’s voltage.

Project info at Soldernerd site.

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2 Comments

  1. A solar panel has a certain voltage (in the region of 17 to 18 volts for a 12 volts pannel, somwhat dependent on temperature) at which it provides most power. Where is this information?

    1. The information should be available in the solar panel’s data sheet. The quality data sheets naturally varies from manufacturer to manufacturer. However, the figures are similar for different panels. It seems they are determined more by fundamental physics than the manufacturing process.

      Some interesting resources on the topic:
      https://en.wikipedia.org/wiki/Maximum_power_point_tracking
      http://www.linear.com/solutions/4545
      http://www.pveducation.org/pvcdrom/solar-cell-operation/effect-of-temperature
      http://www.solar-electric.com/mppt-solar-charge-controllers.html/

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