Charging a 24V Battery with 20V Solar Panel & MPPT Charge Controller

In part one of our series, we demonstrated how to charge a 24V Battery with 20V Solar Panel & PWM Charge Controller. Today, we’re going to be doing the same demo, but using an MPPT charge controller instead.

In our demo below, we’re using the Midnight Kid MPPT charge controller. For solar panels, we’ve got a Canadian Solar 280 watt panel that’s 24V and a SolarWorld 75 watt, 20V panel.

Let’s see what happens when our Solar Queen attempts to charge a 24V battery with a 20V solar panel and MPPT charge controller on a hot, summer day. And see how that compares to doing the same, using a 24V solar panel.

Can I charge a 24V battery with a 20V Solar Panel & MPPT?

About Author

Amy Beaudet
Amy Beaudet was in the solar industry at the altE Store from 2007 until her untimely passing in 2021. She was a sales rep, instructor, and an all-around solar evangelist, sharing her passion for solar around the world. When whe wasn't at work, she enjoyed sailing and skiing - but odds were good she was still talking about solar on the boat or on the slopes. See more of Amy Beaudet's blog posts.


  1. Aaron

    Hi Amy,
    I know that the new enphase micro inverter comply with NEC Rapid Shutdown requirements.
    However I wonder if there is a micro inverter that can work as a stand alone without the grid and not needing a battery.
    If there is sunlight the inverter produce AC output, no sunlight it shuts down.
    This is in a remote area with no grid within miles and only one panel and one inverter is needed.

    1. Amy Beaudet (Post author)

      Sorry, I don’t know of any like that.

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