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Solar Based Battery Charger.....

Muju4mFrnL


Please let me know the basic criterias involved or to be considered in making a SOLAR BASED Li-ion BATTERY CHARGER?

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  • Dear Mujahid,

     

    Making use of MPPT is pretty much essential for loading an solar panel. The output power fluctuates over light intensity and temperature. If you look at the output power curves you will understand that not regulated on the maximum power will make your design far less effective. I have seen an application note on the Microchip website suggesting a microcontroller (PICmicro) to have a boost (DC/DC-converter) with MPPT on the solar panel. It is hard to circumvent microcontrollers in this kind of complex applications.

     

    Best regards,

     

    Enrico Migchels

    Power conversion design engineer

    Best - The Netherlands

    www.heliox.nl

  • in reply to enrico.migchels

    I agree with you but i just have a doubt on the ciruit below using LTC1734.This is a direct solution from LTC. Inother words could you let me know the which could be the best MMPT IC to be used along witht he LTC1734 here???image

  • in reply to Muju4mFrnL

    Hi Mujahid,

     

    The LTC is 'just' a battery charger which regulates the current trough and the voltage of the battery. Your solar charger must have the same charge characteristic as the LTC1730 but additional have a converter on the input stage which regulates the energy coming from the PV cells to a fixed DC voltage with maximum power tracking incoperated. Look at AN1211 'maximum power solar converter' on www.microchip.com to see what i mean. I would say that if you use a microcontroller for this function it might as well regulate the current through the battery and measure the output voltage.

     

    Best regards,

     

    Enrico Migchels

    Power conversion design engineer

    Heliox B.V.

    Best - The Netherlands

    www.heliox.nl

  • in reply to enrico.migchels

    Hi Enrico,

     

    thank you for you valuable feedback and will just check with MPPT and get back. Please let me any redy designs that you know of on for solar panel and will be very helpful.

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