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springboktwo asked

Charging 12v and 24v simultaneously from one mppt controller

Good day legends, hope someone could answer/help me in the right direction.

Equipment - Camper trailer with 2x 200w solar panels, 1 x 200a/h lithium battery and a Victron 75/15 MPPT controller.

I’ve added 4 x 24v electric actuators to open and close the two side doors, connected to 2 x 7a/h 12v batteries in series.

Question - Can I add the 24v battery pack (2x12v in series) to the same mppt controller that currently charges the 200ah lithium battery or must I add a second controller ?

Thanks in advance for your advice.

Deon.

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1 Answer
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kevgermany answered ·

Assuming the lithium is 12V.

The MPPT will not charge different voltages at the same time. Effectively you're trying to connect a 12V battery to a 24V battery. Won't end well

Use an Orion 12/24 DC:DC charger to charge the 24V pack from the 12V. But pick a small one. The 24V batteries are very small. Might be better to ditch the 24V batteries and simply fit an Orion 12/24 power supply, or use the charger in power supply mode.

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