I have a Tycon MPPT solar charge controller. My batteries are wired for 24V, but they are so low the controller thinks they are 12V batteries and won’t charge them

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The MPPT charge controllers by default are set for 12V/24V auto detect. Using the keys on the front of the unit go into the settings and set for 24V battery instead of 12/24 auto detect. Save the setting. Power down the unit by disconnecting the solar and then battery. Power up the unit. It should power up in 24V battery mode. Re-connect the solar input.