Solar Panel Optimisation Circuit for Shaded Environment

Hi,

I am making a SLA Battery Charging circuit that is going to be powered by the solar panels. There are going to be 3 of them in total each 10W 12V rated. The main issue is that each of them is going to be spaced 120 degree apart so only one of them is going to be orientated to the sun and others are going to be picking up the rest. (As it is shown on picture below)

My idea was to use LT3652 Solar Charger with MPPT for each panel, so 3 in total and then wire them in parallel on battery terminals. That way I am expecting to have the maximum performance out of the solar cells and avoid one solar cell degrading the performance of others in case of shading conditions.

So the question is - If this this configuration is going to work sufficient enough to get the most out of the solar cells? Or is there an other option and chips that are maid to resolve such an issue more effectively?

Will it be much different from connecting all panels in parallel and having blocking schotky diode on the positive output of each solar cell and then just using a single MPPT charger?

Thank You.

Parents
  • Hi Zack,

    Thank you for the reply!

    The Suggested LTC4162 Seems quite reasonable with its dynamic MPPT plus the I2C telemetry capabilities. 

    For the panels configuration I am now considering the parallel connection at the input of the MPPT controller as you have suggested.(Depicted Below).

    The main thing is that I want to avoid one shaded panel draining and pulling the voltage of the two other panels down, so I am expecting to use reverse diode to prevent that from happening. Or is is it still going to be the case and overall voltage is going to degrade even with the diodes in place?

    To avoid high drops on the diode I am thinking to use ideal OR Diode set up possibly the single chip solution by LTC4358 (It is pricey though) Might use the alternative with the MOSFET instead.

    Another question weather it matters on which Positive or Negative terminal to place the Blocking diode circuitry?

    Thank You!

Reply
  • Hi Zack,

    Thank you for the reply!

    The Suggested LTC4162 Seems quite reasonable with its dynamic MPPT plus the I2C telemetry capabilities. 

    For the panels configuration I am now considering the parallel connection at the input of the MPPT controller as you have suggested.(Depicted Below).

    The main thing is that I want to avoid one shaded panel draining and pulling the voltage of the two other panels down, so I am expecting to use reverse diode to prevent that from happening. Or is is it still going to be the case and overall voltage is going to degrade even with the diodes in place?

    To avoid high drops on the diode I am thinking to use ideal OR Diode set up possibly the single chip solution by LTC4358 (It is pricey though) Might use the alternative with the MOSFET instead.

    Another question weather it matters on which Positive or Negative terminal to place the Blocking diode circuitry?

    Thank You!

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